Influence of Different Accelerators on the Early Performance of Cement in Different Curing Temperature
摘要
In contemporary infrastructure, rigid pavements are commonly used in highways and airports. During long-term operation, these surfaces may experience structural issues such as fractures, cracks, and damage. Nighttime maintenance, crucial for ensuring smooth traffic, necessitates the use of accelerators to expedite the concrete's solidification. This study investigated the effects of six different acceleration admixtures, including TEA, TIPA, NaSCN, KBr, Ca(HCOO)2, and Ca(NO3)2, as high early strength accelerators in cement paste specimens. Each was individually added to concrete, aiming to investigate the mechanical strength and setting properties under various temperature curing conditions, classify accelerator types, and determine appropriate dosages. Initially, The setting time tests were conducted to assess the impact of accelerators and curing temperatures on the setting time of cement paste. Subsequently, compressive strength tests were employed to evaluate the correlation between accelerator dosage and the early strength of concrete. The experimental results showed that the addition of Ca(HCOO)2 and Ca(NO3)2 could shorten the setting time of cement, thereby reducing construction time. On the other hand, the addition of KBr, TEA, TIPA, and NaSCN increased the early strength of cement, enhancing the pavement's load-bearing capacity. Finally, KBr, NaSCN, and TIPA showed better effect at 50 °C. Overall, under curing at 50 °C, the addition of KBr showed the best results among the six accelerators. It not only increased compressive strength but also slightly reduced the setting time, with the optimal dosage being 2%.