粉煤灰及养护龄期对湿拌砂浆性能的影响

发布时间：2018-01-10 05:04

本文关键词：粉煤灰及养护龄期对湿拌砂浆性能的影响　出处：《硅酸盐通报》2016年11期 　论文类型：期刊论文

【摘要】：以粉煤灰取代部分水泥,研究其掺量及养护龄期对保水率、收缩率、稠度、粘接强度和力学性能的影响,并利用X射线荧光光谱分析仪(XRF)和扫描电子显微镜(SEM)对粉煤灰的物理化学性质进行分析。试验结果表明:掺量在0%~40%,随着粉煤灰掺量的增加,湿拌砂浆干缩率呈减小趋势,湿拌砂浆保水率呈减小趋势。粉煤灰的掺入量与湿拌砂浆拌合物的稠度正比例关系,随着粉煤灰掺量的增加而增大。湿拌砂浆14 d粘接强度随着粉煤灰掺量的增加呈下降趋势。在试验室条件下,掺粉煤灰砂浆试块抗压强度随着养护时间的增长不断增大。因此,在湿拌砂浆中掺入低于30%的粉煤灰时,可以在满足湿拌砂浆力学性能的前提下,抑制收缩变形,提高粘接强度。
[Abstract]:The influence of the content of fly ash and curing age on water retention, shrinkage, consistency, bonding strength and mechanical properties was studied. The physicochemical properties of fly ash were analyzed by X-ray fluorescence spectrometer (XRF) and scanning electron microscope (SEM). The results showed that the content of fly ash was 40%. With the increase of fly ash content, the dry shrinkage rate of wet mix mortar decreased, and the water retention rate of wet mix mortar decreased. With the increase of fly ash content, the bonding strength of wet mix mortar decreased with the increase of fly ash content. The compressive strength of the mortar with fly ash increases with the curing time. Therefore, the mechanical properties of the mortar can be satisfied with the addition of less than 30% fly ash in the wet mortar. Restrain shrinkage and deformation and improve bonding strength.
【作者单位】：四川华西绿舍建材有限公司;
【分类号】：TU578.1
【正文快照】： 1引言利用粉煤灰取代部分水泥,不但可减少水泥用量,还能降低早期水化热,改善砂浆性能,提高水泥基材料的性能[1]。目前,砂浆存在的主要问题就是开裂空鼓问题[2-4]。特别对于抹灰砂浆,主要是附着在建筑物表面,如内墙抹灰,外墙抹灰,尤其外墙抹灰通常与自然环境直接接触,在高温、

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