高掺量粉煤灰PVA-ECC的力学性能研究及粉煤灰作用机理分析

发布时间：2018-01-17 17:09

本文关键词：高掺量粉煤灰PVA-ECC的力学性能研究及粉煤灰作用机理分析　出处：《硅酸盐通报》2017年11期 　论文类型：期刊论文

更多相关文章： 粉煤灰 ECC 纤维长度 力学性能

【摘要】：主要研究了高掺量粉煤灰对PVA-ECC力学性能的影响,对粉煤灰掺量分别为40%、50%、60%情况下PVAECC的抗压强度、薄板四点弯曲性能等进行试验研究,并分析了粉煤灰在ECC中的作用机理。结果表明:随着粉煤灰掺量的增加,ECC的抗压强度呈降低趋势,四点弯曲试验中ECC试件的初裂荷载和峰值荷载降低,跨中挠度增加,且裂缝宽度减小;高掺量粉煤灰下,纤维长度对ECC抗压强度和延性有较大的影响,掺12 mm纤维的PVA-ECC在保证强度的同时,可获得较高的延性和韧性。
[Abstract]:The effect of high fly ash content on the mechanical properties of PVA-ECC was studied. The compressive strength of PVAECC was 60% under the content of 40% fly ash. The four-point bending properties of thin plates were studied and the mechanism of fly ash in ECC was analyzed. The results showed that the compressive strength of ECC decreased with the increase of fly ash content. In the four-point bending test, the initial crack load and peak load of the ECC specimen are reduced, the mid-span deflection is increased, and the crack width is decreased. The fiber length has a great influence on the compressive strength and ductility of ECC under the condition of high fly ash content. The ductility and ductility of PVA-ECC doped with 12mm fiber can be obtained at the same time as the strength is guaranteed.
【作者单位】：江南大学环境与土木工程学院;
【基金】：国家自然科学基金面上项目(51274105)
【分类号】：TU528
【正文快照】： 1引言混凝土具有原材料易获取、加工制作简单和抗压强度高等优点,成为建筑工程中使用最为广泛的工程材料之一。但是混凝土具有抗拉强度低、脆性大和抗裂性能差等缺点,这些缺点易引起混凝土的开裂,混凝土开裂后易造成混凝土保护层的剥落和钢筋锈蚀,从而影响结构耐久性,降低结构

【相似文献】