水泥砂浆的几个关键性能研究

发布时间：2018-02-04 09:10

本文关键词： 功能砂浆保水性干燥收缩早期开裂粘结性能　出处：《清华大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着建筑行业自身对砂浆品质、性能要求越来越严格,环境保护问题越来越引起人们的关注和重视,以及砂浆种类发展的多样化,这些因素都促使了预拌砂浆行业的快速发展。在我国,一些经济发达的城市已经建立了一批具有一定生产规模的预拌砂浆企业。砂浆除了传统的粘结、抹面功能外,被赋予了诸如保温、隔热、吸音、防水、抗裂、修补等特殊功能,其应用范围大大拓宽了。本文主要研究了水泥砂浆的保水性能、干燥收缩性能和早期开裂性能、与基层粘结性能以及常规抗压和抗折性能及其主要影响因素,为开发各类功能砂浆提供必要信息及手段。首先,确定基准砂浆配合比及研究水泥砂浆的保水性能。试验发现,在基准砂浆中加入纤维素醚、淀粉醚、可分散性乳胶粉,均可在一定程度上改善水泥砂浆的的保水性,保水效果最好的是纤维素醚,但随着纤维素醚掺量的增加,砂浆开始变得越来越粘稠,工作性能变差。淀粉醚的加入可以很好的改善水泥砂浆的工作性能,将纤维素醚和淀粉醚复合使用,可以使砂浆获得良好的保水性能和工作性能。其次,在选定的基准砂浆中加入聚丙烯纤维、膨胀剂、纤维素醚、淀粉醚以及同时加入纤维素醚和淀粉醚,研究他们对砂浆干燥收缩和早期抗裂性能的影响。试验发现,在基准砂浆中加入聚丙烯纤维和纤维素醚,可以减小砂浆的干燥收缩和抑制砂浆的早期开裂,而膨胀剂和淀粉醚对砂浆的干燥收缩和早期开裂没有抑制效果。第三,研究砂浆与基层的粘结性能。试验发现,养护条件、基材性质、基材表面粗糙程度、界面剂以及砂浆自身性能等都对砂浆与基层的粘结性能有影响。其中,养护条件对砂浆与基层粘结性能的影响最为显著。在温度相同的情况下,潮湿养护条件下的粘结强度和干燥条件下的粘结强度相差甚远。第四,研究了上述掺加功能外加剂砂浆的抗压和抗折强度。试验发现,聚丙烯纤维、膨胀剂、粉煤灰和高炉矿渣粉等物质的加入以及水胶比的变化,都会对砂浆的抗压和抗折强度产生影响。其中,水胶比对砂浆的强度影响较为显著。最后,将研制的功能砂浆应用到工程上,取得了良好的效果。
[Abstract]:With the construction industry itself to the mortar quality, performance requirements more and more stringent, environmental protection issues have attracted more and more attention, as well as the variety of mortar development. These factors have promoted the rapid development of ready-mixed mortar industry. In China, some economically developed cities have established a number of ready-mixed mortar enterprises with a certain scale of production. Besides the functions of wipe surface, it is endowed with special functions such as heat preservation, heat insulation, sound absorption, waterproof, crack resistance, repair and so on, and its application scope has been greatly broadened. This paper mainly studies the water retention performance of cement mortar. Drying shrinkage and early cracking properties, bonding properties with the base, conventional compressive and flexural properties and their main influencing factors provide necessary information and means for the development of all kinds of functional mortar. The water retention of cement mortar was studied. It was found that cellulose ether, starch ether and dispersible latex powder were added to the base mortar. Can improve the water retention of cement mortar to a certain extent, the best water retention effect is cellulose ether, but with the increase of cellulose ether content, mortar began to become more and more viscous. The addition of starch ether can improve the performance of cement mortar, cellulose ether and starch ether can make the mortar get good water retention and working performance. Polypropylene fiber, expander, cellulose ether, starch ether and both cellulose ether and starch ether are added to the selected reference mortar. It is found that adding polypropylene fiber and cellulose ether to the reference mortar can reduce the drying shrinkage of mortar and restrain the early cracking of mortar. But the expansion agent and starch ether have no inhibition effect on the drying shrinkage and early cracking of mortar. Thirdly, the bond property between mortar and base is studied. The results show that the curing conditions, the properties of substrate and the roughness of substrate surface are found. Interfacial agents and mortar properties have an impact on the bond between mortar and base. Among them, the curing conditions have the most significant effect on the bond between mortar and base. At the same temperature, the effect of curing conditions on the bond between mortar and base is the most significant. The bond strength under wet curing condition is very different from that under dry condition. 4th, the compressive and flexural strength of the mortar mixed with functional admixture mentioned above are studied. It is found that polypropylene fiber, expander. The addition of fly ash and blast furnace slag powder and the change of water-binder ratio will affect the compressive and flexural strength of mortar. The developed functional mortar has been applied to engineering, and good results have been obtained.
【学位授予单位】：清华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU578.1

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