硕士论文：粘结干粉砂浆的试验研究

[xinli_zhao]

粘结干粉砂浆的试验研究
西安建筑科技大家
硕士论文

摘要
针对传统粘结砂浆施工和易性差、粘结力低、耐久性差及外墙饰面砖易脱落等问题，本文作者，系统的研究了灰砂比、有机聚合物种类及掺量、纤维种类及掺量和各种矿物掺合料等因素对砂浆的粘结力及耐久性等性能的影响，开发出了一种性能优良的粘结干粉砂浆。
以单因素试验为基础，通,7办寸各种聚合物对粘结砂浆性能的影响比较，得出轻乙基甲基纤维素醚(MKX45000PE20L)与可再分散孚以交粉(VINNAPAS.RE}OI ON)复合使用，不但可以提高粘结砂浆的综合性能，而且可以适当降低成本;通过对各种纤维对粘结砂浆性能的影响比较，得出了掺入占干拌料的0.1%的木质纤维，可有效的提高粘结砂浆的抗折弛渡，显著提高砂浆的抗收缩性能;矿物掺合料等量取代水泥的研究表明，采用I级粉煤灰取代30%的水泥，不但可以阳氏粘结砂浆的成本，而且可以提高砂浆的和易性、抗折强度及耐久性。
根据相关标准，作者还对所开发的干粉粘结砂浆进行了粘结强度、耐水性、抗收缩性能、晾置时间、耐一热性能及抗冻性能等指标进行了系统的测试，测试结果表明:开发的干粉砂浆各项性能均符合标准要求，且性能优异。同时研究还表明，该粘结砂浆能够满足－20℃左右的冬季施工环境要求，具有良好的防冻性能。
关键词:聚合物:胶粘剂;干粉;粘结砂浆;粘结力;性能:粉煤灰;纤维

ABSTRACT
Owing to the disadvantage traditional bonding mortar with bad construction workability, low- adhesive strength, bad durability and cast of outer ceramic tiles, the several factors influencing on the adhesive strength and durability of bonding mortar were studied systematically, which include ratio of cement to sand, kind and dosages of polymers, kind and dosages of fibers, and mineral admictures,etc. Then, a type of bondingpowder mortar with excellent performances was developed.
Based on mono-factor experiment,by comparing the influence of different polymers on the performances of mortar, it was found that the compounding use of hydroxyethyl methylcellulose(MKX45000PE20L) and redispersible latex powder(VINNAPAS RE5010I) not only improved performances, but also decreased properly the cost of bonding mortar. By comparing the influence of different fibers on the performances of mortar, the results show that adding 0.1 % dosages of mood fiber in dry mortar can effectively increase flexural strength and anti-shrinkage of mortar. By investigating on substituting mineral admixtures for part of cement, it was presented that substituting FA- I for 30% of cement can not only decrease the cost of bonding mortar, but also increase the workability, flexural strength and durability of the bonding mortar.
According to the relative criterions, the different of the developed dry powder mortar were systematically tested, which include bonding strength, water resistance, anti-crack, open time, high temperature resistance and freezing-thawing, etc. The results show that the performances of the developed bonding mortar are excellent, and accord with the relative criterions. In the mean time,
the investigations also show that the bonding mortar can meet the demands of construction under winter weather of -20 0C temperature, and has good performance of anti-freezing.
Key words: polymer; ceramic tiles adhesive;dry;bonding mortar; compounding; properly;fly ash; fiber