2021
DOI: 10.1016/j.conbuildmat.2020.121222
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Solution calorimetry to assess effects of water-cement ratio and low temperature on hydration heat of cement

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Cited by 42 publications
(9 citation statements)
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“…The test results show that the factors that changed the high temperature resistance of concrete were not only the water/cement ratio but also the plastering layer, and whether the plastering layer improved the high-temperature resistance of concrete depended on the water/cement ratio of concrete. For concrete with a high water/cement ratio, most cement was hydrated during the 28 days curing [30,31], so the concrete lacked reactants to continue hydration at high temperatures. When the water/cement ratio dropped, the cement of the concrete was not completely hydrated during the 28 days curing, and the compressive strength of the concrete even increased at 400 • C due to the Van der Waals force [28,32] and hydration of the unhydrated cement.…”
Section: Discussion Of Resultsmentioning
confidence: 99%
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“…The test results show that the factors that changed the high temperature resistance of concrete were not only the water/cement ratio but also the plastering layer, and whether the plastering layer improved the high-temperature resistance of concrete depended on the water/cement ratio of concrete. For concrete with a high water/cement ratio, most cement was hydrated during the 28 days curing [30,31], so the concrete lacked reactants to continue hydration at high temperatures. When the water/cement ratio dropped, the cement of the concrete was not completely hydrated during the 28 days curing, and the compressive strength of the concrete even increased at 400 • C due to the Van der Waals force [28,32] and hydration of the unhydrated cement.…”
Section: Discussion Of Resultsmentioning
confidence: 99%
“…When the water/cement ratio was 0.30, the compressive strength of concrete decreased first, then rose, and then fell again with the increase of temperature. This phenomenon may be attributed to two reasons: (i) With the decrease of water/cement ratio, the number of unhydrated cement particles of concrete increased [30,31], and high temperature promoted the continuous hydration of unhydrated cement particles [3], so concrete with the lowest water/cement ratio (0.30) can realize the improvement of compressive strength in high temperatures. (ii) The improvement of compressive strength at high temperature can be attributed to the Van der Waals force [28,32].…”
Section: Compressive Strengthmentioning
confidence: 99%
“…As shown in Figure 10 , the cumulative heat of hydration increases with the addition of SAP. The cumulative heat of hydration of both samples OPC–0.25SAP and OPC–0.5SAP was higher than that of the control after 24 h. The water entrained in SAP increased the w/c, and the higher w/c increased the degree of hydration of the sample, resulting in a higher cumulative hydration heat [ 43 ]. In contrast, the cumulative hydration heat of the BPC–0SAP samples was much lower compared to the control group.…”
Section: Resultsmentioning
confidence: 99%
“…The porosity and pore structure of concrete are closely related to the water–cement ratio ( W / C ) and the degree of hydration ( α ) [ 30 ]. It has been reported that the degree of hydration can reach as high as 0.89 when the W / C is 0.3 [ 31 ].…”
Section: Models and Numerical Simulationsmentioning
confidence: 99%