渠道衬砌膨胀混凝土力学特性试验研究

在水灰比保持不变的条件下,通过正交试验研究了膨胀剂AEA掺量、粉煤灰掺量及养护条件对混凝土膨胀率和强度的影响规律,提出了强度等级达到C15、自由膨胀率最大的渠道衬砌补偿收缩混凝土最优配合比.结果表明:随着膨胀剂掺量的增大,混凝土膨胀率先升后降,混凝土28d强度有一定幅度的降低;在试验条件下,膨胀剂AEA掺量为水泥质量的12%、粉煤灰掺量为水泥质量的30%及养护条件为水中养护时,混凝土的膨胀率达到最大,强度亦满足渠道衬砌要求.这表明,在渠道衬砌工程中应用微膨胀混凝土是完全可行的.

Study on Expansive Characteristic of the AEA Concrete for Canal Liner

Under water-cement ratio keeping constant,the effects of AEA,fly-ash and maintain condition on the concrete expansive rate and compressive strength were studied by orthogonal test.The optimum mix proportion of indemnifying contract concrete for canal liner was put out.The results show that AEA content deeply influenced the characteristics of expansive concrete,the compressive strength increase with AEA content.Addition of 12% AEA,30% fly-ash and maintain condition could suit with the channel intensity and the durable request.