水泥基自流平防水抗渗砂浆的制备与性能研究

发布时间：2018-11-17 11:36

【摘要】：普通砂浆在施工的时候,等砂浆拌制好以后,按照施工方法,通常要经过人工摊铺、刮平、抹面,在砂浆终凝以前还要做三遍压光等工序,这种分层施工的方法有很多弊端,自流平砂浆可以很好的解决这些问题。水泥基自流平砂浆施工时,只需稍加铺摊就可以自动流平,自流平砂浆具有耐磨性,既可作为基层也可以作为面层,抗渗性能可以有效的防止渗漏,由于是单层施工,避免了开裂、凹凸不平、破损等缺陷,是未来地面找平材料发展的方向。掺入粉煤灰和矿渣粉既可以降低生产成本,又可以提高砂浆的后期强度,脱硫石膏参与水化形成钙矾石,减小了砂浆的收缩,使砂浆的收缩率维持在国标要求的0.15%以内,实验在保证抗压抗折强度的基础上,利用正交表分析了流动度较好的矿物掺合料掺量,加入硫铝酸盐水泥和早强剂提高砂浆的一天强度,聚羧酸减水剂取代萘系减水剂进一步提高砂浆的流动度,掺入消泡剂降低孔隙率,使砂浆更加密实,防水效果更好。结果表明：①粉煤灰和石膏掺入后砂浆强度降低,石膏可减小砂浆收缩,矿渣粉活性较高,10wt%掺量时的强度比5wt%和7.5wt%要好,掺合料的合理搭配可有效提高砂浆的流动度。②硫铝酸盐水泥掺量增加,砂浆1d强度增大,掺量超过11wt%时,砂浆水化加快,离析状况和表面起皮、泛碱现象消失,流动度降低到130mm以下。③聚羧酸减水剂分散作用强,可将砂浆流动度提高到140mm以上,但会引发离析,纤维素醚具有保水、增稠作用,但会延缓水泥的水化,随乳胶粉掺量增加,砂浆强度下降。④NC强剂可将砂浆1d抗折和抗压强度提高到2MPa和6MPa以上,但对1d强度的增加有限,随着掺量的增加,浆体凝结速度加快,稠度增加,流动度下降,离析现象消失。⑤消泡剂掺入后,砂浆孔隙率降低,流动度增大,砂浆更加密实,抗压抗折强度增大,抗渗压强增大。依据《JCT985-2005地面用水泥基自流平砂浆》和《JCT2090-2011聚合物防水浆料》可知,通过正交实验分析和单因素实验分析,最后得出的最优配比的抗折抗压强度,流动度,尺寸变化率和砂浆试件抗渗性能均能达到要求。
[Abstract]:When the ordinary mortar is in construction, and after the mortar has been mixed well, according to the construction method, it usually has to go through manual spreading, scraping, polishing, and three times pressing before the mortar is finally solidified. This method of layered construction has many disadvantages. Self-leveling mortar can solve these problems well. In the construction of cement base self-leveling mortar, it can be flattened automatically with a little spreading stand. The self-leveling mortar has wearability, which can be used either as the base or as the surface layer. The impermeability can effectively prevent leakage, because it is a single-layer construction. Avoid cracking, uneven, damaged and other defects, is the future development direction of leveling materials. The addition of fly ash and slag powder can not only reduce the production cost, but also improve the later strength of mortar. Desulphurization gypsum takes part in hydration to form ettringite, which reduces the shrinkage of mortar and keeps the shrinkage of mortar within 0.15% of the national standard. On the basis of guaranteeing compressive and flexural strength, the authors analyzed the content of mineral admixture with good fluidity by orthogonal table, and added sulphoaluminate cement and early strength agent to improve the daily strength of mortar. The polycarboxylic acid superplasticizer replaces the naphthalene series water reducing agent to further improve the flowing degree of mortar, add defoamer to reduce porosity, make mortar more dense and waterproof effect better. The results show that: (1) the strength of mortar decreases after the addition of fly ash and gypsum, the shrinkage of mortar is reduced by gypsum, the activity of slag powder is higher, and the strength of 10 wt% is better than that of 5wt% and 7.5wt%. The reasonable mix of admixtures can effectively improve the fluidity of mortar. 2 when the content of sulphoaluminate cement is increased and the strength of mortar increases in one day, the hydration of mortar is accelerated, the segregation condition and surface exfoliation are increased, and the pan-alkali phenomenon disappears when the admixture is more than 11wt%. When the fluidity decreases below 130mm, the dispersion of polycarboxylic acid water reducer is strong, which can increase the flowing degree of mortar to above 140mm, but it will cause segregation. Cellulose ether has the function of keeping water and thickening, but it will delay the hydration of cement, and with the increase of the amount of latex powder, The strength of mortar decreases. 4NC can increase the flexural strength and compressive strength of mortar to more than 2MPa and 6MPa, but the increase of 1d strength is limited. With the increase of content, the setting speed of mortar increases, the consistency increases and the mobility decreases. After the addition of defoamer, the porosity of mortar decreases, the fluidity increases, the mortar becomes more dense, the compressive strength increases and the impermeability pressure increases. According to < JCT985-2005 cement based self-leveling mortar > and < JCT2090-2011 polymer waterproof slurry >, through orthogonal experimental analysis and single factor experimental analysis, the best ratio of flexural compressive strength and fluidity is obtained. The size change rate and impermeability of mortar can meet the requirements.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU578.1

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