超早强型聚羧酸减水剂在套筒灌浆料的应用研究
本文选题:套筒灌浆料 切入点:超早强 出处:《山东建筑大学》2017年硕士论文 论文类型:学位论文
【摘要】:随着装配式建筑的发展,作为装配式建筑的关键节点,在装配式建筑中钢筋套筒灌浆连接普遍应用。因此对于套筒灌浆料的要求也在日益提高,传统套筒灌浆料在应用过程中暴露出许多问题,因此研制高性能的灌浆料对于装配式建筑的发展必不可少。聚羧酸减水剂与传统的高效减水剂相比具有减水率高、保坍能力强、分子结构设计灵活等优点。聚羧酸系减水剂是一类分子结构呈梳形、含多羧基的聚合物表面活性剂,分子结构的独特使得这类减水剂具有更多的特点。随着高性能砂浆与混凝土市场需求的增长,对减水剂的减水性能、分散性能和力学性能的要求明显提高,对超早强型聚羧酸减水剂的研究逐渐成为研究热点。迫切需要研发早期强度高、减水率较高、适应性好、保坍能力强的外加剂。首先依据聚羧酸高性能减水剂的分子结构设计思想,通过改变甲基烯丙基聚氧乙烯醚长侧链的分子量,接枝能提高混凝土早期强度的酰胺基团等进行单因素合成试验。然后采用正交试验方法确定了合成最优方案,即合成小料掺量为0.3%,引发剂掺量为0.6%,酸醚比为5.5∶1,AM替代率为20%,大单体的比例n(HPEG2400)∶n(HPEG5000)=0.5∶1,链转移剂掺量为1.4%,并且在最优方案下合成出了超早强聚羧酸减水剂PC-S。通过改变聚羧酸减水剂掺量,研究了聚羧酸减水剂对套筒灌浆料性能的影响,确定出超早强聚羧酸减水剂的最佳掺量为0.16%。通过砂浆试验研究其各早强组分随掺量变化对性能的影响,然后通过正交试验确定了复配早强剂的最优方案,即硫酸钠掺量为0.5%,亚硝酸钠掺量为0.5%,甲酸钙掺量为0.5%。通过对比试验发现,掺加PC-S超早强聚羧酸减水剂,可以使套筒灌浆料早期强度提高,而28 d的强度发展差别不大。掺PC1601+复配早强剂的套筒灌浆料的早期强度也有一定程度的提高,但是28 d强度略有降低。
[Abstract]:With the development of assembly building, as the key node of assembly building, the reinforced sleeve grouting connection is widely used in assembly building, so the requirement of sleeve grouting material is also increasing day by day. Many problems have been exposed in the application of traditional sleeve grouting materials, so it is necessary to develop high performance grouting materials for the development of fabricated buildings. Compared with traditional high efficiency water reducing agents, polycarboxylic acid superplasticizer has high water reducing rate and strong ability to protect against collapse. Polycarboxylic acid superplasticizer is a kind of polymer surfactant with comb-shaped molecular structure and polycarboxyl group. With the increase of market demand for high performance mortar and concrete, the requirements for water reducing performance, dispersion and mechanical properties of water reducing agents are obviously increased. The research on super early strong polycarboxylic acid superplasticizer has gradually become a research hotspot. It is urgent to develop early high strength, high water reduction rate and good adaptability. First, according to the molecular structure design idea of polycarboxylic acid high performance water reducer, by changing the molecular weight of long side chain of methyl allyl polyoxyethylene ether, The single factor synthesis experiment was carried out by grafted amide groups which can improve the early strength of concrete. The optimum scheme of synthesis was determined by orthogonal test. That is to say, the amount of synthetic small material is 0.3, the amount of initiator is 0.6, the ratio of acid to ether is 5.5: 1am, the substitution rate of AM is 20, the ratio of macromonomer to monomer is 0.5: 1, the amount of chain transfer agent is 0.5: 1, and the super early strong polycarboxylic acid reducer PC-S has been synthesized by changing the amount of polycarboxylic acid water reducer. The effect of polycarboxylic acid superplasticizer on the performance of sleeve grouting material was studied. The optimum addition amount of super early strong polycarboxylic acid superplasticizer was determined to be 0.16. Then through orthogonal test, the optimum scheme of compound early strength agent is determined, that is, the dosage of sodium sulfate is 0.5, sodium nitrite is 0.5 and calcium formate is 0.5. Through the contrast experiment, it is found that the addition of PC-S super early polycarboxylic acid superplasticizer, The early strength of sleeve grouting material increased, but the strength development of 28 days was not different. The early strength of sleeve grouting material mixed with PC1601 was also increased to a certain extent, but the strength of 28 days was slightly decreased.
【学位授予单位】:山东建筑大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TU528.042.2
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