Abstract
A kind of microcapsule sustained-release–type hydration heat inhibitor (MSR) was prepared. The effect of MSR on semi-adiabatic temperature rise, setting time, and strength of low-heat Portland cement was investigated. Microcalorimetry, XRD, SEM, and TG-DSC were used to investigate the mechanism of MSR on hydration of low-heat Portland cement. The results showed that the MSR had good regulating effect on hydration of low-heat Portland cement. When the dosage of MSR was 0.3%, the heat release rate decreased by 10% and the peak temperature decreased by 52%. The 3D compressive strength decreased by 50%, and the 28-day strength was the same as control. The MSR can delay the hydration of low-heat Portland cement by inhibiting the heat release rate of C2S and C3S minerals.
Highlights
Thermal cracking control (Springenchmid et al, 1985; Springenschmid, 1994; Springenschmid, 1994; Springenschmid, 1998; David et al, 2005) has always been a hot subject widely researched by engineers
It should be pointed out that the temperature with 0.3% microcapsule sustained-release–type hydration heat inhibitor (MSR) showed double peaks. It indicated that the addition of 0.3% MSR led to the decrease in the maximum temperature and played a certain regulating role in the maximum temperature
After the MSR was added, the polysaccharide in the MSR was continuously released during the reaction
Summary
Thermal cracking control (Springenchmid et al, 1985; Springenschmid, 1994; Springenschmid, 1994; Springenschmid, 1998; David et al, 2005) has always been a hot subject widely researched by engineers. In order to control the temperature rise in hydraulic engineering, it is often necessary to take other construction measures such as embedded cooling water pipe and mixing with ice in addition to using low-heat Portland cement. All these measures lead to additional construction time and cost. No one has studied the control effect of hydration heat inhibitor on lowheat Portland cement in hydraulic mass concrete engineering. The influence of MSR on the hydration heat release of cement single mine was proved by a microcalorimeter
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