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    Application of destruction specific energy for characterisation of concrete paving blocks
    (THOMAS TELFORD PUBLISHING, 2009) Atici, U.; Ersoy, A.; Ozturk, B.
    Concrete interlocking paving blocks (CIPB) are used in a variety of commercial, municipal and industrial applications. This study aimed to develop a prescription (optimum parameters of aggregate proportion, water/cement (w/c) ratio and dosage) for producing CIPB based on destruction specific energy (SE(des)), strength, hardness and abrasion resistance. In developing countries, CIPB are being produced by a trial and error method, which results in uneconomical and low engineering properties. This may arise as a result of the lack of confidence and the lack of technical experience in the CIPB field. In order to gain these qualifications, optimum water/cement (w/c) ratio and dosages, and optimum aggregate characteristics at different ages are determined for CIPB within the scope of the presented study. Recently defined SEdes, which is estimated from the area (integral) under the stress strain envelope in unconfined compression test, is used. The splitting and flexural tensile strengths, rebound hardness and abrasion resistance results showed consistency with the SEdes. The optimum parameters of aggregate proportion, w/c ratio and dosage are obtained. Accordingly, the application of SEdes for production of CIPB results in lower cost and higher quality engineering properties for CIPB.
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    Correlation of specific energy of cutting saws and drilling bits with rock brittleness and destruction energy
    (ELSEVIER SCIENCE SA, 2009) Atici, U.; Ersoy, A.
    The focus of this study is to statistically evaluate the correlations between brittleness, destruction specific energy (SEdes), and both cut-ability and drillability using the optimum data obtained from the experimental works. Applying regression analyses, the predictive models of cutting specific energy (SEcut) and the drilling specific energy (SEdrill) were developed based on the rock brittleness and rock destruction energy data. The models were verified by statistical tests and found to be reliable on being used in practical situations. Good linear, polynomial and exponential relationships between SEcut of circular diamond saw blades and the brittleness B-1 (the ratio of compressive strength to tensile strength), B-2 (the ratio of compressive strength minus tensile strength) and B-3 (compressive strength multiple tensile strength divided by two) were found. There are no correlations between SEdrill of polycrystalline diamond compact (PDC) core bits, impregnated diamond both core and non-core bits and brittleness values. The newly defined destruction specific energy (SEdes) was estimated from the area (integral) under stress-strain envelope in unconfined compression test. This method provides a better understanding of the relationships between SEcut, SEdrill, drilling and cutting rate, and the main mechanical rock character. SEdes was found to be directly related to brittleness of B-1, B-2 and B-3. Each method of measuring brittleness has its own usage in rock processing depending on practical utility (C) 2008 Elsevier B.V All rights reserved.
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    Evaluation of destruction specific energy of fly ash and slag admixed concrete interlocking paving blocks (CIPB)
    (ELSEVIER SCI LTD, 2008) Atici, U.; Ersoy, A.
    Concrete interlocking paving blocks (CIPB) are widely used in flooring and covering applications such as city roads, pedestrian foots, gardening architecture and many surface coverings. The focus of this study is to evaluate destruction specific energy (SEdes) of CIPB containing fly ash and blast-furnace slag at different curing conditions. The SEdes is estimated from the area (integral) under stress-strain envelope for an unconfined compression test. This method provides a better understanding between performance and the main mechanical character of CIPB. Compressive strength, splitting tensile and flexural tensile strengths, rebound hardness and abrasion resistance tests at 3, 7, 28, 90 and 180 days were carried out. The test results showed that fly ash (FA) and blast-furnace slag (BFS) can replace the cement by amounts of 10-20%, 30-40% of mass, respectively. This helps to produce CIPB with lower cost and better engineering properties. The relationship between SEdes, strength, hardness. and abrasion are defined for CIPB. (C) 2007 Elsevier Ltd. All rights reserved.