养护制度对掺MgO膨胀剂混凝土力学性能的影响研究

Influence of curing system on mechanical properties of concrete mixed with MgO expansion agent

研究了不同掺量MgO膨胀剂在自然养护、标准养护、限制养护和高温养护条件下对混凝土力学性能的影响,结果表明:随着MgO膨胀剂掺量增大,各养护条件下,混凝土抗压强度均逐渐降低;不同养护条件对混凝土强度影响明显,高温养护下强度发展最快,自然养护下,强度发展最慢;对于C30混凝土,掺20 kg MgO膨胀剂对混凝土强度无明显负面影响;掺MgO膨胀剂混凝土长龄期抗压强度无倒缩现象。

The effects of different amounts of MgO expansion agent on the mechanical properties of concrete under natural curing,standard curing,limited curing and high temperature curing conditions were studied.The results show that:with the increase of MgO expansion agent dosage,the concrete compressive strength under each curing condition The strength is gradually reduced;different curing conditions have a significant impact on the strength of the concrete.The strength develops fastest under high-temperature curing,and the strength develops the slowest under natural curing;for C30 concrete,20kg MgO expansion agent has no significant negative impact on concrete strength;the long-term compressive strength of concrete mixed with MgO expansion agent without decreases.