石灰石粉对机制砂干混砂浆性能影响的研究

发布时间：2018-06-06 03:22

本文选题：机制砂干混砂浆 + 石灰石粉　；参考：《河北工程大学》2017年硕士论文

【摘要】：机制砂干混砂浆是一种由胶凝材料、机制砂、掺合料、外加剂以及根据性能确定的其他组分组成,按一定比例,在专业生产厂经计量、混合的新型建筑砂浆,具有品质稳定、机械化施工、绿色环保等方面的优点。随着我国基础建设的大规模展开,粉煤灰、矿渣粉等传统矿物掺合料在一些地区日益紧缺,石灰石粉是一种廉价及易获取的新型矿物掺合料。因此,将石灰石粉应用于机制砂干混砂浆中,是节约资源、保护环境的重大举措,具有特殊的经济效益、社会效益和环境效益。本论文运用了对比的研究方法,研究了石灰石粉作为掺合料在机制砂干混砂浆等量取代粉煤灰,其不同取代率及不同比表面积对机制砂干混砂浆物理、力学以及抗渗的性能影响,研究表明:石灰石粉比表面积为800m2/kg且等量取代粉煤灰的取代率为60%时,机制砂干混砂浆的流动度与保水率达到最大,分别较单掺粉煤灰增加15.5%、1.4%;随着石灰石粉取代粉煤灰取代率以及比表面积的增大,机制砂干混砂浆的表观密度与凝结时间都有所下降;石灰石粉比表面积大于600m2/kg且等量取代粉煤灰的取代率为60%时,有助于机制砂干混砂浆早期抗压、抗折强度的提高,同时,比表面积为600m2/kg、800m2/kg及1000m2/kg的石灰石粉,14d拉伸粘结强度分别比单掺粉煤灰增加11.8%、19.6%、25.5%;石灰石粉有利于机制砂干混砂浆抗渗性的提高。因此,石灰石粉的比表面积宜为800m2/kg,且与粉煤灰复掺,复掺比例为6:4,即石灰石粉掺量为水泥的18%,粉煤灰掺量为水泥的12%,此时,机制砂干混砂浆综合性能较好。
[Abstract]:Mechanism sand dry mixing mortar is a new type of building mortar which is composed of cementing material, machined sand, admixture, admixture and other components determined according to its properties. According to a certain proportion, it is a new type of building mortar that has been measured and mixed in professional production plants, and has stable quality. Mechanized construction, green environmental protection and other aspects of the advantages. With the large-scale development of infrastructure in China, traditional mineral admixtures such as fly ash and slag powder are becoming increasingly scarce in some areas. Limestone powder is a cheap and easily available new mineral admixture. Therefore, it is an important measure to save resources and protect the environment by applying limestone powder to the mechanism sand and dry mixing mortar. It has special economic, social and environmental benefits. In this paper, a comparative research method is used to study the physical properties of dry mixing mortar with different substitution rate and specific surface area, when limestone powder is used as admixture to replace fly ash in the same amount of dry mortar. The effects of mechanical properties and impermeability properties show that when the specific surface area of limestone powder is 800m2/kg and the substitution rate of the same amount of replacing fly ash is 60, the fluidity and water retention rate of dry mortar are maximum. The apparent density and setting time of dry mortar decreased with the increase of substitution rate and specific surface area of fly ash. When the specific surface area of limestone powder is larger than 600m2/kg and the substitution rate of the same amount of replacing fly ash is 60%, it is helpful to improve the early compressive and flexural strength of dry mixing mortar, and at the same time, The tensile bond strength of limestone powder with specific surface area of 600m2 / kg or 800m2kg and 1000m2/kg is 11.819.6% and 25.5d higher than that of single fly ash, respectively, and limestone powder can improve the impermeability of dry-mixed mortar. Therefore, the specific surface area of limestone powder should be 800m ~ 2 / kg, and mixed with fly ash with a ratio of 6: 4, that is, the content of limestone powder is 18% of cement, and the amount of fly ash is 12% of cement. At this time, the comprehensive properties of dry mortar with mechanism sand are better.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU578.1

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