HPMC对再生微粉泡沫混凝土基本性能影响研究

Effect of HPMC on Basic Properties of Recycled Micropowder Foam Concrete

为解决制作再生微粉泡沫混凝土过程中泡沫破灭严重的问题,研究了羟丙基甲基纤维素醚(HPMC)对再生微粉泡沫混凝土性能的改善效果,分析了HPMC在不同掺量下对再生微粉泡沫混凝土性能影响的变化规律,对掺量分别为0.0、0.2%、0.4%、0.6%和0.8%(HPMC百分比为占发泡剂溶液质量的质量比)的HPMC制作的泡沫体系进行了性能测试,并对制取的再生微粉泡沫混凝土进行了力学性能试验对比研究。试验结果表明:HPMC存在最佳掺量,HPMC掺量为0.4%时效果最佳,泡沫泌水量、沉降距及发泡剂发泡倍数均有很好的改善,再生微粉泡沫混凝土浆体流动性、稳定性较好,试件3d、7d、28d的抗压强度均高于其他掺量,在此基础上增加或减少HPMC掺量,再生微粉泡沫混凝土的强度均有不同程度的下降。

In order to solve the serious problem of foam bursting in the process of producing recycled micropowder foam concrete, the effect of hydroxypropyl methylcellulose(HPMC)ether on the performance of recycled micropowder foam concrete was studied, and the changing law of the effect of HPMC of different mixing amounts on the performance of recycled micropowder foam concrete was analyzed, and performance tests were conducted on the foam systems made by HPMC with dosages of 0.0, 0.2%, 0.4%, 0.6%, and 0.8%(The HPMC percentage is the mass ratio of the foaming agent solution mass). Also, the mechanical properties of the recycled micropowder foamed concrete were comparatively studied. The test results showed that when the mixing amount of HPMC is 0.4%, the effect was the best, the foam water secretion, the settling distance and the foaming factor of the foaming agent were all improved, with excellent fluidity and stability of the recycled micropowder foam concrete slurry, and the compressive strength of the specimens at 3 d, 7 d and 28 d was higher than that of other additives. On this basis, increasing or reducing the mixing amount of HPMC could reduce the strength of recycled micropowder foam concrete to different extents.