防渗抗裂剂和PVA纤维对混凝土性能及微观结构的影响研究

Influence of Impermeable and Anti-cracking Agent and PVA Fiber on Concrete Performance and Microstructure

为了探究防渗抗裂剂和PVA纤维对混凝土性能的影响,研究了单掺PVA纤维、单掺防渗抗裂剂(W)和复掺PVA纤维与防渗抗裂剂对混凝土和易性、混凝土早期开裂性能、力学性能、体积稳定性和抗渗性能的影响。结果表明:防渗抗裂剂可以增加混凝土拌和物的粘稠度,提高混凝土拌和物的抗离析性能和保水保坍性能,改善现场混凝土施工和易性;单掺防渗抗裂剂和单掺PVA纤维均可以有效地提高混凝土抗裂性能和抗渗性能;复掺PVA纤维和防渗抗裂剂与单掺PVA纤维相比,并没有产生明显的优势叠加效应。

In order to research the influences of impermeable and anti-cracking agent and PVA fiber on concrete performance and microstructure,the effects of PVA fiber,impermeable and anti-cracking agent (W) and compound PVA fiber and impermeable and anti-cracking agent on concrete workability,early-age crack resistance,comprehensive strength,volume stability and impervious performance are investigated by experiments.The results show that,(a) the impermeable and anti-cracking agent can improve the performance of concrete mixture cohesiveness,the property of concrete anti-segregability and the slump loss resistant property;(b) the performances of concrete crack resistance and impervious performance can be obviously improved with adding impermeable and anti-cracking agent or PVA fiber;and (c) the combined adding of impermeable and anti-cracking agent and PVA fiber does not produce a significant superimposition effect compared with adding PVA fiber alone.