Study on creep and drying shrinkage behaviour of geopolymer concrete

Abstract

Cement Concrete (OPCC) has been commonly used as a primary building material over the past several decades. However, the production process of ordinary Portland cement produces a significant amount of carbon dioxide gas, which is one of the major sources of green gases, contributing on global warming. Thus, now a day's concrete researcher has been investigating as an alternative, environment friendly and sustainable construction materials over past few decades, known as geopolymer concrete. it is made from reacting aluminate and silicate bearing materials such as fly ash, blast furnace slag and metakaolin rather than OPC with alkaline activator. The past research on geopolymer concrete reported that some properties like workability, setting time, compressive strength, young's modulus, tensile strength and other short-term properties are comparable to the same grade of OPC concrete. However, very little research work is being done on the analysis of the creep and shrinkage performance of geopolymer concrete, which is an important parameter for the serviceability of the concrete design. Thus, creep and shrinkage of geopolymer concrete are studied in this research. The three different geopolymer binders such as 100% fly ash, 90% fly ash with 10% GGBFS and 85% fly with 15% GGBFS were composed to study the performance of workability, setting time, compressive strength, shrinkage and creep of GPC. The current available models for shrinkage and creep of concrete were studied and compared with experimental data of geopolymer concrete mixes and it was found that none of the existing shrinkage and creep models fit the experimental results of geopolymer concrete. Thus, new model for shrinkage and creep of GPC was proposed that best fitted the experimental results.

Date of Award	2021
Original language	English