- 张 丰，白 银，陈 波，宁逢伟，吕乐乐，胡海明
2021年第7期
摘要
引用本文
摘 要：从强度、凝结时间、水化热及混凝土工作性、耐久性等方面比较了5种混凝土早强剂在低温环境下的性能差异，综合评价了市售混凝土早强剂的低温使用效果。结果表明：5 ℃养护下，早强剂使砂浆7 d强度均有一定程度提高，但1 d强度仍比较低，且会使28 d强度倒缩；早强剂的掺入可促进低温下水泥的水化，使水化诱导期缩短，最大放热速率、放热量增大；掺D、E早强剂对混凝土工作性影响不大，满足实际工程施工性能的要求，可一定程度提高混凝土早期强度，但低温早强效果仍有限，且会导致混凝土后期性能下降。
Abstract: The performance differences of five kinds of commercial concrete early-strength agents at low temperature were compared from the perspectives of compressive strength, setting time, hydration heat, and workability and durability of concrete, and the application effect of the early-strength agents currently on the market was evaluated. The results show that under 5 ℃ curing, the early-strength agent can increase the strength of the mortar to a certain extent, but the strength of 1 d is still relatively low, and it will shrink the strength of 28 d. The incorporation of the early-strength agent can promote the hydration of cement at low temperature, shorten the hydration induction period, and increase the maximum heat release rate and heat release. Adding D and E early-strength agents has little effect on the workability of concrete, which meets the requirements of actual engineering construction performance and can increase the early strength of concrete to a certain extent. However, the effect of low-temperature early-strength is still limited, and adding early-strength agents will cause the later performance of concrete to decline.
张丰,白银,陈波,等.混凝土早强剂低温性能试验研究[J].混凝土与水泥制品,2021(7):1-6.
ZHANG F,BAI Y,CHEN B,et al.Study on the Propery of Early-strength Agent of Concrete at Low Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(7):1-6.
