Abstract
This paper reports an investigation into the autogenous shrinkage, mechanical, and durability performances of alkali-activated slag concrete (AASC) with emulsified cooking oil (ECO). Properties of AASC including flowability, setting time, compressive strength, autogenous shrinkage, and carbonation depth are tested to clarify the effects of the ECO. Commercially available expansion agent (EA) and shrinkage reducing agent (SRA) are also applied on AASC to compare with ECO. Experimental results show that the utilization of ECO could significantly decrease the autogenous shrinkage of alkali-activated slag concrete owing to the reduction of surface tension and the denser internal structure. It also shows that cooking oil after emulsification could have better performances than that of plain cooking oil when applied on AASC. Setting time and carbonation resistance ability are also improved with the utilization of ECO. The application of ECO is considered a cheap and easy way to overcome the limitation of AASC.
Highlights
Production of ordinary Portland cement is currently a serious source of global warming.Roughly 0.7–1 ton of CO2 is released while producing 1 ton of cement [1]
The primary aim of this article is to investigate the effects of plain cooking oil and emulsified cooking oil (ECO) on the shrinkage-reducing performance of activated slag concrete (AASC)
ECO was applied to AASC as a shrinkage-reducing agent and compared with shrinkage reducing agent (SRA), expansion agent (EA), and cooking oil
Summary
Production of ordinary Portland cement is currently a serious source of global warming.Roughly 0.7–1 ton of CO2 is released while producing 1 ton of cement [1]. Production of ordinary Portland cement is currently a serious source of global warming. CO2 emissions is contributed by cement manufacture-related activities, and the production of cement is considered as the third largest producer of greenhouse gas [2,3]. Numerous studies have been focusing on eco-friendly alternative supplementary cementitious materials to limit the emission of CO2. Is a type of industrial by-product obtained during pig-iron manufacturing and is generally used as supplementary cementitious materials [4]. Compared with ordinary Portland cement (OPC)-based binder, the application of GGBFS can remarkably decrease hydration heat and increase the durability of concrete [5]. The relatively low early age strength of GGBFS limits its applications [6]
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