硫铝酸盐水泥基防水砂浆的制备及性能研究

发布时间：2018-01-03 21:08

本文关键词：硫铝酸盐水泥基防水砂浆的制备及性能研究　出处：《济南大学》2014年硕士论文　论文类型：学位论文

【摘要】：硫铝酸盐水泥具有早强、高强等特点，因此被广泛应用于水工工程和快速修补工程等特殊建筑工程领域。虽然硫铝酸盐水泥较普通硅酸盐水泥具有许多优良的性能，比较适合应用于防水领域，但仅以硫铝酸盐水泥制备的普通防水砂浆还有许多缺点，因此本课题做了若干改性探索，旨在制备出强度达标、抗渗压强优越的新型硫铝酸盐水泥防水砂浆。研究结果如下：（1）研究了萘系减水剂、脂肪族减水剂及有机硅憎水剂三种不同组分对硫铝酸盐水泥防水砂浆强度和抗渗压强的影响发现，有机硅憎水剂对硫铝酸盐水泥防水砂浆的强度和抗渗压强的影响远大于萘系减水剂和脂肪族减水剂，而萘系减水剂和脂肪族减水剂对硫铝酸盐水泥防水砂浆强度和抗渗压强的影响区别不大。有机硅减水剂的合理掺量为0.2％，当其掺入量超过0.2％将会降低硫铝酸盐水泥防水砂浆的强度和抗渗压强。（2）采用掺合料复掺的方式，探索了粉煤灰、矿渣及硅灰两两以不同比例搭配对硫铝酸盐水泥防水砂浆力学性能、抗渗压强及硬化浆体微观结构的影响。研究结果表明，掺合料的掺入会明显降低硫铝酸盐水泥砂浆的早期强度，，但对后期强度影响不大，以矿渣：硅灰为4:1时中后期强度发挥最好。在抗渗性方面，以粉煤灰：矿渣为3:2时抗渗性能最差，而粉煤灰：硅灰为3:2时相对较好。综合各种性能，掺合料的搭配以矿渣：硅灰为4:1为最佳配比。（3）探索了可再分散乳胶粉和纤维素醚单掺对硫铝酸盐水泥防水砂浆力学性能、吸水率及抗渗性能的影响。结果表明，在强度方面，这两种聚合物的掺入虽会降低早期强度，但对后期强度并无多大影响。在吸水率方面，两种聚合物的掺入都会明显降低硫铝酸盐水泥砂浆的吸水率，且纤维素醚略优于可再分散乳胶粉。在抗渗性能方面，纤维素醚远优于可再分散乳胶粉，尤其是当掺量达到1.5‰以上时，硫铝酸盐水泥砂浆的抗渗压强能达到2.2MPa以上而仍未透水。因此，以河砂为骨料的硫铝酸盐基防水砂浆的优化配比为：水泥17.5％、矿渣4.5％、硅灰3.0％、骨料75％，外掺萘系减水剂、有机硅憎水剂、生石灰、纤维素醚分别占胶凝材料总量的1.0％、0.2％、1.0％、2.0％，其力学强度达到JC/T984-2005聚合物水泥防水砂浆的要求，抗渗性能大大超过了JC/T984-2005的指标要求。（4）探索了人工砂的颗粒级配对硫铝酸盐水泥防水砂浆的强度、吸水率、稠度及抗渗压强都有很大的影响，合理的粗中细砂搭配不仅可以增加砂浆的强度、减少砂浆的吸水率，而且还能改善砂浆的稠度和防水性能。其优化实验配比为：粗砂：中砂：细砂为0:1:1，掺合料占胶凝材料量为15％，纤维素醚占胶凝材料量为1.75‰。制备的防水砂浆1d抗折强度达5.6MPa，抗压强度22.8MPa；28d抗折强度6.7MPa，抗压强度34.1MPa；稠度为79mm，7d抗渗压强为在2.2MPa恒压1h后渗透高度仅11mm，其力学强度达到JC/T984-2005聚合物水泥防水砂浆的要求，抗渗性能大大超过了JC/T984-2005的指标要求。
[Abstract]:Sulphoaluminate cement with early strength, high strength and other characteristics, so it is widely used in hydraulic engineering and rapid repair engineering special field of architectural engineering. Although the sulphoaluminate cement than Portland cement has many excellent properties and is suitable for the application in the field of water, but there are many shortcomings only in sulphoaluminate cement prepared by ordinary waterproof mortar, so this issue made some modification to explore, in order to prepare qualified strength, impermeability pressure superior new sulphoaluminate cement waterproof mortar. The results are as follows:
(1) of naphthalene superplasticizer, aliphatic superplasticizer and silicone hydrophober three different components of sulphoaluminate cement waterproofing mortar strength and impermeability pressure found impact strength of silicone hydrophober sulphoaluminate cement mortar waterproof and seepage pressure is larger than the effect of naphthalene superplasticizer and aliphatic superplasticizer however, naphthalene superplasticizer and aliphatic superplasticizer on sulphoaluminate cement waterproofing mortar strength and impermeability pressure difference. The influence of reasonable dosage of silicone superplasticizer is 0.2%, when the doping amount of more than 0.2% will reduce the sulphoaluminate cement waterproofing mortar strength and impermeability pressure.
(2) the mineral admixtures way, explore the fly ash, slag and silica fume on the performance of 22 with different proportion of collocation of sulphoaluminate cement waterproof mortar impermeability mechanics, pressure and the influence of microstructure of hardened paste. The results show that the admixture incorporation will significantly reduce the early strength sulphoaluminate cement mortar, but little influence on the later strength of 4:1 slag: silica fume in the late strength to play the best. In impermeability, fly ash slag is 3:2 the worst anti permeability performance, and fly ash: silica fume is 3:2 relatively better. The comprehensive performance of admixture in collocation slag: silica fume is 4:1 for the best ratio.
(3) to explore the redispersible emulsion powder and cellulose ether doped on sulphoaluminate cement waterproofing mortar mechanical properties, water absorption and anti permeability effect. The results show that in terms of strength, the two kinds of polymer incorporation may decrease the early strength, but the later strength has no influence on water. Rate, two kinds of polymer incorporation will significantly reduce the water absorption rate of sulphoaluminate cement mortar, and the cellulose ether is slightly better than that of redispersible latex powder. In impermeability, cellulose ether is much better than that of redispersible emulsion powder, especially when the content reaches 1.5 or more, the impermeability pressure can reach 2.2MPa had not yet permeable sulphoaluminate cement mortar. Therefore, the river sand in order to optimize the ratio of acid base sulfur aluminum waterproof mortar aggregate for cement slag: 17.5%, 4.5%, 3% and 75% silica fume, aggregate, admixture of naphthalene superplasticizer, silicone hydrophober, students Lime and cellulose ether account for 1%, 0.2%, 1% and 2% of the total cementitious material, respectively, and their mechanical strength reaches the requirement of JC/T984-2005 polymer cement waterproofing mortar, and its permeability is much higher than that of JC/T984-2005.
(4) to explore the strength, the particle size of artificial sand pairing sulphoaluminate cement waterproof mortar water absorption, consistency and anti permeability has great effect on pressure, coarse sand and reasonable collocation can not only increase the strength of cement mortar, reduce the water absorption of mortar, but also can improve the consistency and performance of waterproof mortar. The optimization experiment ratio: coarse sand: Sand: fine sand is 0:1:1, admixture total cementitious material content is 15%, cellulose ether total cementitious material was 1.75 per thousand. The preparation of waterproof mortar 1D flexural strength of 5.6MPa, the compressive strength of 22.8MPa 28d 6.7MPa; flexural strength, compressive strength 34.1MPa; consistency is 79mm, 7d impermeability pressure penetration height of only 11mm in the 2.2MPa 1h after the constant pressure reaches JC/T984-2005, the mechanical strength of polymer cement waterproof mortar, impermeability greatly exceed the requirements of JC/T984-2005 index.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ177.62

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