抗裂防水剂对硅酸盐水泥的收缩变形及水化特征影响的研究

发布时间：2017-12-26 17:14

本文关键词：抗裂防水剂对硅酸盐水泥的收缩变形及水化特征影响的研究　出处：《硅酸盐通报》2016年12期 　论文类型：期刊论文

【摘要】：研究了掺入抗裂防水剂的硅酸盐水泥砂浆早期变形性能以及水化温升特征。试验选择用水灰比为0.35、0.40、0.45,抗裂防水剂掺量为6%、10%、14%。用膨胀收缩仪,测试在不同的养护条件下试件收缩变形;利用智能多点测温仪,测试硅酸盐水泥砂浆的水化升温特征。结果表明:除0.35水灰比,抗裂防水剂为14%的硅酸盐水泥砂浆以外,其余组硅酸盐水泥砂浆,14 d的膨胀值均达到最大值,14 d以后均产生收缩。0.4水灰比的胶砂,经过60℃、70℃、80℃等成熟度养护再转常温养护后,表现为先膨胀后收缩,且膨胀值随抗裂防水剂掺量的增加而增大。当抗裂防水剂掺量为6%时,硅酸盐水泥砂浆的早期水化温升变化相差不大,抗裂防水剂掺量为10%、14%时,硅酸盐水泥砂浆的早期水化温升差别较大。
[Abstract]:The early deformation properties of Portland cement mortar mixed with anti cracking water repellent and the characteristics of hydration temperature rise were studied. The ratio of water to ash is 0.35, 0.40 and 0.45, and the content of anti - crack and waterproof agent is 6%, 10% and 14%. The shrinkage and deformation of specimens under different curing conditions were tested by expansion dilation apparatus, and the characteristics of hydration and heating of Portland cement mortar were tested by intelligent multi-point thermometer. The results showed that except for 0.35 water cement ratio and 14% crack resistant Portland cement mortar, the expansion value of Portland cement mortar and 14 d of other groups reached the maximum value, and they all contracted after 14 d. The 0.4 water cement ratio of the resin bonded sand after curing at 60 degrees, 70 degrees, 80 degrees, and then turned to normal temperature, showed that it first expanded and then contracted, and the expansion value increased with the increase of the amount of anti cracking waterproofing agent. When the dosage of anti cracking and waterproofing agent is 6%, the change of temperature rise of Portland cement mortar at early stage is not very different. When the dosage of anti cracking waterproofing agent is 10% and 14%, the temperature rise of Portland cement mortar at early stage is quite different.
【作者单位】：沈阳建筑大学材料科学与工程学院;辽宁大通公路工程有限公司;
【基金】：住房和城乡建设部(2015-K4-033)
【分类号】：TQ172.1
【正文快照】： 1引言随着我国建筑行业的高速发展,混凝土、砂浆工程不断地涌现,大体积工程自身体积大,胶凝材料用量多,而胶凝材料的水化反应会引起混凝土内部温度的提高,同时还会产生大量的收缩变形。根据前人的研究成果,在混凝土中掺入一定量的抗裂防水剂可以减小混凝土的收缩变形,但抗裂防

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