- 張 豐，白 銀，陳 波，寧逢偉，呂樂樂，胡海明
引用本文摘 ? 要：從強度、凝結時間、水化熱及混凝土工作性、耐久性等方面比較了5種混凝土早強劑在低溫環境下的性能差異，綜合評價了市售混凝土早強劑的低溫使用效果。結果表明：5 ℃養護下，早強劑使砂漿7 d強度均有一定程度提高，但1 d強度仍比較低，且會使28 d強度倒縮；早強劑的摻入可促進低溫下水泥的水化，使水化誘導期縮短，最大放熱速率、放熱量增大；摻D、E早強劑對混凝土工作性影響不大，滿足實際工程施工性能的要求，可一定程度提高混凝土早期強度，但低溫早強效果仍有限，且會導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.
張豐,白銀,陳波,等.混凝土早強劑低溫性能試驗研究[J].混凝土與水泥制品,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.