Investigation of fire and chemical effects on the properties of alkali-activated lightweight concretes produced with basaltic pumice aggregate
Küçük Resim Yok
Tarih
2020
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Sci Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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.
Açıklama
Anahtar Kelimeler
Alkali-activated lightweight concrete, Strength, Durability, Basaltic pumice, Microstructure
Kaynak
Construction and Building Materials
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
260
