硅灰和偶联剂及PB-g-PS水泥改性剂复合改性水泥砂浆的性能及微观结构

发布时间：2018-04-15 12:06

本文选题：微观结构 + 改性性能水泥砂浆　；参考：《长春工业大学》2017年硕士论文

【摘要】：本文合成了聚丁二烯接枝聚苯乙烯(PB-g-PS)胶乳,接下来把吐温-20加入到其中,得到PB-g-PS水泥改性剂,并将该水泥改性剂和硅灰还有偶联剂共同掺入到水泥砂浆中,考察了其各项性能及微观结构,使用DSC和FTIR等检测方法进行了改性砂浆的水泥的水化情况的研究,具体实验工作情况视下:1、使用半连续性乳液聚合的技术,制备出PB-g-PS接枝聚合物。并对其使用FTIR进行表征证明,分析结果表明得到了所需的目的产物。向胶乳中加入占其固体质量为5%的吐温-20,制备了PB-g-PS水泥改性剂。2、水对水泥的质量比控制在0.45时,采取在水中养护方式的情况下,将硅灰和偶联剂还有水泥改性剂共同用于改性砂浆中。实验结果表明,加入一定质量的硅灰时,发现随偶联剂含量的增加,复合改性水泥砂浆的抗压强度、抗折强度、体积密度等各项性能提高;加入一定量的偶联剂时,随硅灰含量的增加复合改性水泥砂浆的抗压强度、抗折强度、体积密度等各项性能也提高。3、利用SEM考察了改性砂浆的微观结构,研究分析结果表明:从改性砂浆的微观结构中,看到了乳胶膜的树枝状结构,同时还有氢氧化钙的晶体结构,其呈现六角形片状。4、同时利用FTIR、DSC等检测分析方法进行了硅灰及偶联剂等对水泥水化作用的影响的研究。结果表明:加入一定质量的硅灰时,偶联剂的加入质量比为0.2%时,水泥水化程度最高;加入一定质量的偶联剂时,随硅灰含量的增加,水泥水化程度呈先增加后降低的变化趋势,硅灰的加入质量比为10%时,水泥水化程度最高。
[Abstract]:The synthesis of polybutadiene grafted polystyrene (PB-g-PS) latex, next to Twain -20 to join them and get the PB-g-PS cement modifier, and the cement modifying agent and silica fume and coupling agent together mixed into cement mortar, investigated the performance and micro structure, using DSC and FTIR detection method. The study of hydration modified cement mortar, concrete experimental work as below: 1, the use of semi continuous emulsion polymerization technology, the preparation of PB-g-PS graft polymer. And the use of FTIR method, analysis results show that the obtained product is required. Added to the latex for the solid mass of 5% Twain -20, preparation of PB-g-PS cement modifier.2, the quality of water to cement ratio control in 0.45, taken in the case of water conservation, the silica fume and coupling agent and cement modifier used in common Modified mortar. The experimental results show that adding a certain quality of wollastonite, found with the increase of the content of coupling agent, the compressive strength of the composite modified cement mortar, flexural strength, improve the performance of volume density; adding a certain amount of coupling agent, with the increase of content of wollastonite composite modified cement mortar the compressive strength, flexural strength, volume density and also improve the performance of.3, investigated the microstructure of mortar modified by SEM, the analysis results show that: the microstructure of the modified mortar, saw the dendritic structure of latex film, as well as the calcium hydroxide crystal structure, the hexagonal plate.4. At the same time by FTIR, research DSC detection analysis method of the effect of silica fume and coupling agent on the cement hydration. The results show that the addition of a certain quality of silica fume, the addition of coupling agent ratio was 0.2%, the cement hydration The degree of hydration is the highest. When adding a certain amount of coupling agent, the hydration degree of cement increases first and then decreases with the increase of silica fume content. When the mass ratio of silica fume is 10%, the degree of hydration of cement is the highest.

【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ177.62

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