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Comparative analysis of long-term and high temperature performances of OPC based high strength mortar and silica fume based high strength geopolymer mortars
(Elsevier Science Inc, 2024) Saridemir, Mustafa; Celikten, Serhat; Bulut, Metehan; Deniz, Suvat
The effects of Class C fly ash (FA) contents on the performance of silica fume (SF) based high strength geopolymer mortars (HSGM) subjected to high temperatures up to 1000 degrees C are investigated. The percentages of FA substitution by SF are 10%, 15%, 20% and 25% by weight. The alkali activators used consist of sodium silicate (SS) and sodium hydroxide (SH) and are used in mixtures with SH/SS ratios of 0.3, 0.4, 0.5 and 0.6. In order to compare SF based HSGMs, ordinary Portland cement (OPC) based high strength mortar (HSM) as a control mortar is also produced with the same dosage and water content. The results at environmental temperature show that higher mechanical properties are obtained from SF based HSGMs compared to OPC based HSM. The optimum replacements of Class C FA and SH/SS ratios are 15 % and 0.3 or 0.4 in terms of mechanical properties. At 28 days, SF based HSGMs with flexural strength (ffs) of 15 MPa and compressive strength (fc) of 100 MPa can be produced without thermal curing. High reductions in the mechanical properties are seen on the OPC based HSM and SF based HSGMs subjected to high temperatures. In addition, SF based HSGMs with fc values above 25 MPa can also be obtained after exposure to 1000 degrees C. Alterations in the microstructure of OPC based HSM and SF based HSGMs under the influence of high temperatures are also examined with XRD, FTIR, SM, and FESEM/EDX analyses. Particularly, a spongy structure with volumetric expansion is seen with the formation of the glassy phase in the matrix of SF based HSGMs subjected to a temperature of 1000 degrees C.
Effect of calcined perlite content on elevated temperature behaviour of alkali activated slag mortars
(Elsevier, 2020) Celikten, Serhat; Saridemir, Mustafa; Akcaozoglu, Kubilay
In this paper, the influence of calcined perlite on the elevated temperature behaviour of alkali activated slag (AAS) mortars is researched. The diversity parameters of mortars are the levels of calcined perlite (CP) replacement (0, 25 and 50% by volume), the molecular silicate modulus (0.25, 0.50, 0.75, 1.00 and 1.25) and the levels of elevated temperature (400 degrees C, 600 degrees C and 800 degrees C). The flexural strength (f(f)), compressive strength (f(e)) and mass loss of mortars produced according to these diversity parameters are determined. Moreover, X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) analyses are performed on the samples from the mortars exposed to ambient and elevated temperatures. The experimental results prove that the initial f(f) and f(e) results of mortars at ambient temperature significantly reduce with the increase of CP content. This decrease in the f(f) and f(e) results of mortars is confirmed by the mass losses and microstructure analysis. On the other hand, the experimental results prove that there are significant improvements in the residual strengths of mortars at elevated temperatures with the increase of CP content.
Effect of elevated temperatures on properties of high strength mortars containing ground calcined diatomite with limestone sand
(Elsevier, 2022) Saridemir, Mustafa; Yildirim, Ahmet
This paper investigates the effect of elevated temperatures on the properties of high strength mortars (HSMs) containing ground calcined diatomite (GCD) produced with limestone sand (LS). In the HSM mixtures at a water-binder ratio of 0.35, GCD is employed in place of cement at replacement ratios of 0, 5, 10, 15 and 20% by weight. The mechanical and microstructural properties of HSMs containing GCD produced with LS are investigated separately at different curing days and elevated temperatures. The results of these properties have indicated that GCD can be employed instead of cement in the HSMs containing GCD produced with LS, and GCD content up to %15 improve the mechanical properties of HSMs. Especially, deteriorations and cracks in the HSMs are seen due to the calcification and expansion of LS used as sand in the mixtures at 1000 degrees C temperature, and consequently, high decreases in the mechanical properties are observed.
Effect of high temperature, acid and sulfate on properties of alkali-activated lightweight aggregate concretes
(Elsevier Sci Ltd, 2022) Saridemir, Mustafa; Celikten, Serhat
The primary aim of the present study is to research the effect of binary blended on the mechanical, microstructural and durability properties of alkali activated lightweight aggregate concretes (AALWACs) used basaltic pumice (BP) as lightweight aggregate. Ground granulated blast furnace slag (GGBFS) and fly ash (FA) as precursors are activated with the mixtures of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) in diverse SiO2/Na2O ratios (Ms). The unit weight, compressive strength (f(c)), flexural strength (f(fs)) and splitting tensile strength (f(sts)) and water absorption of AALWACs are determined. Moreover, the f(c) and weight loss of AALWACs exposed to high temperature, acid and sulfate effects are determined separately. The results show that higher strength can be obtained from the AALWACs compared to the control concrete (C) produced with only Portland cement. The effects of high temperatures on the microstructures of AALWACs are examined by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and polarized light microscope (PLM) analyses. As the temperature exposed to the AALWACs increases, SEM and PLM analyses indicate that the deterioration, alteration, discoloration, pore and crack in their microstructures increase.
Effect of silica fume and ground pumice on compressive strength and modulus of elasticity of high strength concrete
(ELSEVIER SCI LTD, 2013) Saridemir, Mustafa
This paper presents the results of experimental study on compressive strength and secant modulus of elasticity of high strength concrete (HSC) containing different levels of silica fume, ground pumice and silica fume together with ground pumice. Three concrete series with water-binder ratios of 0.25 and a constant total binder content of 450 kg/m(3) were designed. The compressive strength and secant modulus of elasticity of these concrete series were determined. The experimental results clearly reveal the use of silica fume and silica fume together with ground pumice with a very low water-binder ratio in the production of HSC. The highest compressive strength and secant modulus of elasticity are obtained in the concrete mixtures containing 15% silica fume and 15% silica fume together with 5% ground pumice. The relationship between the compressive strength and secant modulus of elasticity of HSC was also discussed. New two equations for modulus of elasticity of concrete containing different levels of silica fume, ground pumice and silica fume together with ground pumice have been proposed. The experimental results of dependent modulus of elasticity of concrete were compared with the results of various equations-proposed by some of national building codes and the authors, and also the results of new equations proposed in this study. (C) 2013 Elsevier Ltd. All rights reserved.
Effect of specimen size and shape on compressive strength of concrete containing fly ash: Application of genetic programming for design
(ELSEVIER SCI LTD, 2014) Saridemir, Mustafa
The use of fly ash as a mineral admixture in the manufacture of concrete has received considerable attention in recent years. For this reason, several experimental studies are carried out by using fly ash at different proportions replacement of cement in concrete. In the present study, the models are developed in genetic programming for predicting the compressive strength values of cube (100 and 150 mm) and cylinder (100 x 200 and 150 x 300 mm) concrete containing fly ash at different proportions. The experimental data of different mixtures are obtained by searching 36 different literatures to predict these models. In the set of the models, the age of specimen, cement, water, sand, aggregate, superplasticizers, fly ash and CaO are entered as input parameters, while the compressive strength values of concrete containing fly ash are used as output parameter. The training, testing and validation set results of the explicit formulations obtained by the genetic programming models show that artificial intelligent methods have strong potential and can be applied for the prediction of the compressive strength of concrete containing fly ash with different specimen size and shape. (C) 2013 Elsevier Ltd. All rights reserved.
Effects of different curing conditions on the long-term properties of alkali activated GBP plus GBFS mortars exposed to high temperatures
(Elsevier Sci Ltd, 2022) Saridemir, Mustafa; Bulut, Metehan; Akca, Ugurcan
This study investigates the effects of Na concentration, steam curing and oven curing conditions on the long-term mechanical and microstructural properties of alkali activated ground basaltic pumice (GBP) and ground blast furnace slag (GBFS) mortars subjected to ambient and high temperatures. The alkali activated mortars are produced with 50% GBP + 50% GBFS as binding material. To bind these materials, liquid Na2SiO3 and solid Na (OH) as activator are used at different Na concentrations. The alkali activated GBP + GBFS mortars subjected to ambient and high temperatures are tested for unit weight, ultrasonic pulse velocity, flexural strength and compressive strength. Additionally, XRD, SEM and EDAX analyses are performed on the alkali activated GBP + GBFS mortars subjected to ambient and high temperatures. The results have shown that the higher strength values can be obtained from alkali activated GBP + GBFS mortars compared to the control mortars. Moreover, the results have shown that the strength values gradually decrease as the temperature exposed to the control mortars increases, but the strength values of alkali activated GBP + GBFS mortars up to 450 degrees C temperature gradually increase, and decrease gradually at later high temperatures.
Effects of elevated temperatures and cooling regimes on the waste andesite dust-based geopolymer mortars
(Elsevier Sci Ltd, 2024) Celikten, Serhat; Saridemir, Mustafa; Sologlu, Mustafa
In this study, the geopolymer mortar mixtures were manufactured by activating andesite stone cutting waste dust with sodium silicate. The sodium silicate content in the mixtures was determined to contain 6%, 8% and 10% Na2O by weight of waste andesite dust (WAD). The produced mixtures were subjected to thermal curing at three different temperatures (60 degrees C, 75 degrees C and 90 degrees C), and in two different periods (8 hours and 24 hours). Flexural strength (fs) and compressive strength (fc) tests of 1, 28 and 56 days were carried out on the specimens obtained from the geopolymer mortar mixtures. The effects of Na2O content, thermal curing temperature and time on the strength values of the geopolymer mortars were investigated. Moreover, the geopolymer mortar samples produced with 8 hours of thermal curing were exposed separately to 400 degrees C, 600 degrees C and 800 degrees C. The specimens, which were kept for 1 hour at 400 degrees C, 600 degrees C and 800 degrees C, were exposed to three different cooling conditions (slow-cooled in air, fast-cooled in air and water-cooled). The fs and fc tests were carried out on the cooled geopolymer mortars, and the effects of high temperatures and cooling conditions on the strength properties of the geopolymer mortars were evaluated. In addition, the changes in the microstructures were examined by performing XRD and SEM/EDAX analyses on the selected geopolymer mortars. The fs and fc values of the watercooled geopolymer mortars significantly decreased.
Effects of fly ash, activator ratio and steel fiber on freeze-thaw cycle, sulfuric acid, thermal conductivity and impact resistance of silica fume based AAHSMs
(Elsevier Sci Ltd, 2024) Saridemir, Mustafa; Bulut, Metehan
This study is focused on the effects of Class C fly ash (FA), NaOH/Na2SiO3 (SH/SS) ratio and steel fiber (STF) on the freeze-thaw (F-T) cycle, sulfuric acid, thermal conductivity and impact resistance of silica fume (SF) based alkali activated high strength mortars (AAHSMs). In the AAHSM mixtures, FA in different proportions (10%, 15%, 20% and 25%) is used instead of SF by weight. All the mixtures are prepared with water-to-binder rate of 0.32. F-T cycle results exhibit that the flexural strength (ffs) fs ) and compressive strength (fc) c ) values of SF based AAHSMs without and with STF are less affected than those of ordinary Portland cement (OPC) based high strength mortars (OPCHSMs) without and with STF. After 300 F-T cycles, the f fs and fc c values of SF based AAHSMs without and with STF are still over 14 MPa and 95 MPa, respectively. After exposure to 20% sulfuric acid solution for 90 and 180 days, the SF based AAHSMs without and with STF exhibit super performance (i.e., fc c values between 78.95 MPa and 96.81 MPa), while the surfaces of OPCHSMs without and with STF are disintegrated. Additionally, the effects of F-T cycle and sulfuric acid solution on SF based AAHSM and OPCHSM are examined with the microstructure analyses. Thermal conductivity results show that the SF based AAHSMs without and with STF perform better than the OPCHSMs without and with STF. The thermal conductivity results of OPCHSMs without and with STF vary between 0.630 W/m.K and 0.697 W/m.K, while the thermal conductivity results of SF based AAHSMs without and with STF range from 0.507 W/m.K and 0.623 W/m.K. Thermal conductivity results are adversely influenced by increasing STF content in the SF based AAHSMs and OPCHSMs. Impact resistance results show that the SF based AAHSMs without and with STF perform better than the OPCHSMs without and with STF. Moreover, the impact resistance values increase, as the amount of STF used in the SF based AAHSMs and OPCHSMs increases.
Effects of ground basaltic pumice and high temperatures on the properties of HSMs
(Elsevier, 2021) Saridemir, Mustafa; Bulut, Metehan
The mechanical and microstructural properties of high strength mortars (HSMs) containing ground basaltic pumice (GBP) subjected to 25, 300, 600, 900 and 1050 degrees C temperatures are investigated in this article. The mortars containing GBP employing the replacement ratio up to 25% GBP by weight of ordinary Portland cement (OPC) as well as a control mortar manufactured with OPC are produced. Two different cures, which are steam curing and pochette curing, are applied to the fresh mortars produced. The unit weight (rho), ultrasonic pulse velocity (U-pv), flexural strength (f(s)) and compressive strength (f(c)) of mortars containing GBP are investigated at the short/long terms and high temperatures. The microstructural properties of mortars containing GBP at high temperatures are also investigated by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX) analyses. The results have shown that GBP can be successfully used instead of OPC in the mortar mixtures. Especially, the steam curing application has improved the mechanical properties of mortars containing GBP better than those of pochette curing.
Effects of Ms modulus, Na concentration and fly ash content on properties of vapour-cured geopolymer mortars exposed to high temperatures
(Elsevier Sci Ltd, 2023) Saridemir, Mustafa; celikten, Serhat
This study aimed to analyse the effects of silica modulus (Ms modulus), Na concentration and fly ash (FA) content on the mechanical and microstructural properties of vapour-cured (at 75 degrees C for 8 h) ground granulated blast furnace slag (GGBFS)-based geopolymer mortars (GPMs). For this purpose, 27 different GPM mixtures with 0, 25 and 50 % percentages of FA were produced. In the mixtures, the sodium silicate and NaOH were used for the mortar production at three different Ms of 0.25, 0.5 and 1.0, and the amount of activators was determined to provide 3, 6 and 9 % Na concentration as a percentage of total precursor (GGBFS or GGBFS + FA). Experimental results showed that the optimum Ms modulus was 0.5 for the vapour-cured mortars made with 0 % FA and was 1.0 for the vapour-cured mortars produced with 25 and 50 % FA. The highest flexural strength (Fs) and compressive strength (Cs) values were achieved on the vapour-cured mortars made with 6 % Na, and 50 % FA. Besides, the Fs/Cs ratio of vapour-cured mortars were improved with increasing FA content. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) and polarized light microscopy (PLM) analyses showed that there were alterations and deteriorations in the microstructure of vapour-cured GPM matrixes exposed to high temperatures.
Empirical modeling of flexural and splitting tensile strengths of concrete containing fly ash by GEP
(TECHNO-PRESS, 2016) Saridemir, Mustafa
In this paper, the flexural strength (f(fs)) and splitting tensile strength (f(sts)) of concrete containing different proportions of fly ash have been modeled by using gene expression programming (GEP). Two GEP models called GEP-I and GEP-II are constituted to predict the f(fs) and f(sts) values, respectively. In these models, the age of specimen, cement, water, sand, aggregate, superplasticizer and fly ash are used as independent input parameters. GEP-I model is constructed by 292 experimental data and trisected into 170, 86 and 36 data for training, testing and validating sets, respectively. Similarly, GEP-II model is constructed by 278 experimental data and trisected into 142, 70 and 66 data for training, testing and validating sets, respectively. The experimental data used in the validating set of these models are independent from the training and testing sets. The results of the statistical parameters obtained from the models indicate that the proposed empirical models have good prediction and generalization capability.
Empirical modeling of splitting tensile strength from cylinder compressive strength of concrete by genetic programming
(PERGAMON-ELSEVIER SCIENCE LTD, 2011) Saridemir, Mustafa
Compressive strength and splitting tensile strength are both mechanical properties of concrete that are utilized in structural design. This study presents gene expression programming (GEP) as a new tool for the formulations of splitting tensile strength from compressive strength of concrete. For purpose of building the GEP-based formulations, 536 experimental data have been gathered from existing literature. The GEP-based formulations are developed for splitting tensile strength of concrete as a function of age of specimen and cylinder compressive strength. In experimental parts of this study, cylindrical specimens of 150 x 300 mm and 100 x 200 mm in dimensions are utilized. Training and testing sets of the GEP-based formulations are randomly separated from the complete experimental data. The GEP-based formulations are also validated with additional 173 data of experimental results other than the data used in training and testing sets of the GEP-based formulations. All of the results obtained from the GEP-based formulations are compared with the results obtained from experimental data, the developed regression-based formulation and formulas given by some national building codes. These comparisons showed that the GEP-based formulations appeared to well agree with the experimental data and found to be quite reliable. (C) 2011 Elsevier Ltd. All rights reserved.
Genetic programming approach for prediction of compressive strength of concretes containing rice husk ash
(ELSEVIER SCI LTD, 2010) Saridemir, Mustafa
Soft computing techniques have recently been widely used to model some of human activities in many areas of civil engineering applications. In this paper, two models in gene expression programming (GEP) approach for predicting compressive strength of concretes containing rice husk ash have been developed at the age of 1, 3, 7, 14, 28, 56 and 90 days. For purpose of building the models, experimental results for 188 specimens produced with 41 different mixture proportions are obtained from the literature. According to these experimental results, the models are arranged by using seven different input variables in GEP approach. In according to these input variables, the compressive strength values from mechanical properties of concretes containing rice husk ash are predicted in GEP approach models. The results of training, testing and validation sets of the models are compared with experimental results. All of the results showed that GEP is a strong technique for the prediction of compressive strength values of concretes containing rice husk ash. (C) 2010 Elsevier Ltd. All rights reserved.
Influence of calcined diatomite content and elevated temperatures on the properties of high strength mortars produced with basalt sand
(Ernst & Sohn, 2020) Saridemir, Mustafa; Celikten, Serhat; Ciflikli, Murat; Karahancer, Mustafa
In this paper, the effect of calcined diatomite (CDT) content on the mechanical, microstructural, and mineralogical properties of high strength mortars (HSMs) exposed to 25, 400, 600, 800, and 1,000 degrees C temperatures is investigated. The percentages of CDT that replace Portland cement (PC) in this work are 0, 5, 10, 15, and 20%, by weight. The researched properties of the HSMs are the unit weight (U-w), ultrasonic pulse velocity (U-pv), flexural strength (f(s)), compressive strength (f(c)) and the analyses of X-ray powder diffraction, polarized light microscopy, and scanning electron microscopy/energy dispersive spectroscopy. The experimental results show that the CDT has a potential to be successfully employed as a partial replacement of PC in the HSMs exposed to elevated temperatures. The optimal replacement level of PC by CDT is determined as 15% from strength tests. Besides, the U-w, U-pv, f(s), and f(c) values progressively reduce as the temperatures subjected to the HSMs increase. The CDT has a positive effect on the f(s) and f(c) values the HSMs after exposure to elevated temperatures.
Investigation of fire and chemical effects on the properties of alkali-activated lightweight concretes produced with basaltic pumice aggregate
(Elsevier Sci Ltd, 2020) Saridemir, Mustafa; Celikten, Serhat
This paper evaluates the properties of alkali-activated lightweight concretes (AALWCs) produced with basaltic pumice aggregate. The AALWC mixtures using the replacement ratios of 0, 25 and 50% blast furnace slag (BFS) by weight of fly ash (FA) are produced in addition to a reference lightweight concrete (RLWC) produced by only Portland cement. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) are employed as activating agents in the AALWC mixtures. The experimental studies are performed to investigate the properties of AALWCs. In these studies, the strength properties like compressive strength (f(c)), flexural strength (f(fs)) and splitting tensile strength (f(sts)) are determined. Moreover, the durability properties such as water absorption, acid and sulfate attacks resistance, and behaviour at elevated temperatures are studied. The residual f(c) and mass loss of lightweight concretes (LWCs) including the RLWC are examined after the durability tests. The results of AALWCs are compared with each other and RLWC. The change in the microstructures of LWCs due to the elevated temperatures are researched by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) spot, X-ray diffraction (XRD) and polarized light microscope (PLM) analyses. The results show that the AALWCs have superior durability properties than the RLWC. Moreover, the recovery of wastes such as BFS and FA contributes to both reducing environmental pollution and reducing CO2 emissions. (C) 2020 Elsevier Ltd. All rights reserved.
Long-term properties of steel fiber reinforced silica fume based AAMs at ambient and high temperatures
(Elsevier Sci Ltd, 2024) Saridemir, Mustafa; Bulut, Metehan; Deniz, Suvat; Deneme, Ibrahim Ozguer
In this study, the influences of Class C fly ash (FA), steel fiber (STF) and high temperature are researched on the mechanical and microstructural properties of STF reinforced silica fume (SF) based alkali activated mortars (AAMs) cured at the ambient (25 degrees C) temperature. The STF reinforced SF based AAMs are produced with 10%, 15%, 20% and 25% Class C FA by weight in place of SF, 0.5%, 1% and 1.5% STF by volume, liquid sodium silicate (Na2SiO3) and solid sodium hydroxide (NaOH). The apparent density (rho(a)), ultrasonic pulse velocity (U-pv), flexural strength (f(fs)) and compressive strength (f(c)) results of the STF reinforced control mortars (CMs) and SF based AAMs subjected to the ambient and elevated temperatures are investigated. The microstructural investigations are conducted with X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM)/energy dispersive X-ray (EDAX). Moreover, color changes, pores and interfacial transition zones (ITZs) in samples exposed to the ambient and high temperatures are examined by a stereoscopic microscope (SM). The results have shown that the high strengths can be obtained from STF reinforced SF based AAMs at ambient temperature (25 degrees C) and the optimum Class C FA and STF contents are 15% and 1%. Additionally, when STF reinforced SF based AAMs are exposed to high temperatures (especially 750 degrees C and 1000 degrees C), a serious decrease in the mechanical properties is observed due to the formation of a porous and spongy structure in the matrix and the STFs completely oxidizing and losing their properties.
Mechanical and microstructural properties of alkali-activated lightweight mortars exposed to high temperatures
(Elsevier, 2021) Saridemir, Mustafa; Celikten, Serhat; Ayaydin, Gunay
The influence of the curing conditions (ambient curing or heat-curing), and concentration of the activating agent (8, 10, 12, 14, 16, 18 and 20 Molar sodium hydroxide solution) on the properties of alkali-activated lightweight mortars (AALWMs) containing ground granulated blast furnace slag (GGBFS) as sole binder is reported in this study. AALWMs are exposed to elevated temperatures (150, 250 and 500 degrees C) at the age of 28 days. The investigated properties of AALWMs at ambient and high temperatures are the unit weight (U-w), ultrasonic pulse velocity (U-pv), flexural strength (f(s)), compressive strength (f(c)) and the analyses of X-ray powder diffraction (XRD) and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). The best strength results have been achieved on the ambient-cured AALWMs activated with 8 M NaOH solution.
Mechanical and microstructural properties of calcined diatomite powder modified high strength mortars at ambient and high temperatures
(Elsevier, 2020) Saridemir, Mustafa; Celikten, Serhat; Yildirim, Ahmet
In this experimental work, mechanical and microstructural properties of calcined diatomite powder (CDP) modified high strength mortars (HSMs) at ambient and high temperatures were researched. In the HSM mixtures, Portland cement was replaced with CDP at ratios of 0%, 5%, 10%, 15% and 20%. Several experiments regarding the hardened properties were carried out at 14, 28, 56 and 90 days at the ambient temperature of 25 degrees C. HSMs were heated up to high temperatures of 400 degrees C to 1000 degrees C at the age of 56 days, separately. Then, high temperature resistances of HSMs were quantified in terms of the residual hardened properties and the changes in the microstructural properties after heating. The residual performance was found to be higher in the HSMs modified with CDP than in the reference HSM (R-HSM) which was made 0% CDP. Based on the test results, it was seen that the HSM modified with 15% CDP (15CDP-HSM) exhibited the highest mechanical properties at ambient and high temperatures. (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
Mechanical properties of SFRHSC with metakaolin and ground pumice: Experimental and predictive study
(Techno-Press, 2017) Saridemir, Mustafa; Severcan, Metin Hakan; Celikten, Serhat
The mechanical properties of steel fiber reinforced high strength concrete (SFRHSC) made with binary and ternary blends of metakaolin (MK) and ground pumice ( GP) are investigated in this study. The investigated properties are ultrasonic pulse velocity (U-pv), compressive strength (f(c)), flexural strength (f(f)) and splitting tensile strength (f(st)) of SFRHSC. A total of 16 steel fiber reinforced concrete mixtures were produced by a total binder content of 500 kg/m(3) for determining the effects of MK and GP on the mechanical properties. The design fc was acquired from 70 to 100 MPa by using a low water-binder ratio of 0.2. The test results exhibit that high strength concrete can be obtained by replacing the cement with MK and GP. Besides, correlations between these results are executed for comprehending the relationship between mechanical properties of SFRHSC and the strong correlations are observed between these properties. Moreover, two models in the gene expression programming (GEP) for predicting the f(c) of SFRHSC made with binary and ternary blends of MK and GP have been developed. The results obtained from these models are compared with the experimental results. These comparisons proved that the results of equations obtained from these models seem to agree with the experimental results.

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