Abstract
In this study, the effect of material temperature during casting on fresh properties, hydration kinetics, and early-age compressive strength of self-consolidating concrete (SCC) was evaluated. Concrete equivalent mortars (CEMs) based on SCC mixture designs with water-to-binder ratios of 0.41 and 0.45 were investigated. The SCC mixtures are targeted for infrastructure and building construction and precast applications. The CEMs were prepared at temperatures ranging from 8 to 36°C. Superplasticizer (SP) and air-entraining agent (AEA) demand were evaluated for the CEM mixtures made with different supplementary cementing material (SCM) and limestone filler types. Test results showed that the ambient temperature can significantly affect the SP and AEA demand, hydration kinetics, and compressive strength after 1 d of age. According to the ultraviolet–visible spectrophotometry (UV/Vis) test, the absorption rate of polycarboxylate-based SP decreased with temperature. In contrast, the sensitivity of polynaphthalene sulfonate-based SP to temperature was minimal. Relationships between the variations of different admixture contents, heat flux, and compressive strength with temperature were developed. For a constant slump flow and air content, the demand of the SP and AEA, heat flux, and 1-d compressive strength of CEMs increased linearly with material temperature.
Highlights
Self‐consolidating concrete (SCC) is a highly workable concrete that flow under its own weight and can encapsulate reinforcing bars in restricted sections, with minimum risk of segregation
Given the same mixture proportion, the results show that the polycarboxylate ether superplasticizers (PCE) reduced the heat evolution at high temperatures when the fly ash (FA) was used
The effect of ambient temperature during casting on early‐age properties of the Concrete equivalent mortars (CEMs) associated with SCC mixtures designated for infrastructure, building construction, and precast applications was evaluated
Summary
Self‐consolidating concrete (SCC) is a highly workable concrete that flow under its own weight and can encapsulate reinforcing bars in restricted sections, with minimum risk of segregation. This study investigated the effect of material temperature of concrete equivalent mortar (CEM) mixtures proportioned with different types of SCMs and chemical admixtures.
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