干混砂浆用原材料对砂浆性能影响的研究

发布时间：2018-09-13 12:25

【摘要】：干混砂浆是指由胶凝材料、细骨料、外加剂和掺合料等按一定比例进行混合而成的一种新型建筑砂浆，具有品质稳定、品种多样、便于施工、绿色环保等方面的优越性。本论文分析了干混砂浆用原材料的性能指标。研究了水泥性能与干混砂浆性能的相关性。结果表明：干混砂浆强度并不随水泥强度增大而增大，而与水泥用量或粉料用量有关；由于干混砂浆的干料粉率等因素的影响，使干混砂浆的用水量也并非随水泥标准稠度用水量增多而增多，水泥初凝时间对干混砂浆凝结时间影响亦不呈规律性变化。提出了干混砂浆干料粉率的概念，并探讨了影响干混砂浆干料粉率的因素。本论文对各类细骨料（黄砂、人工砂、再生砂）进行了颗粒级配分析，研究了各类细骨料细度模数对砂浆干料粉率的影响。通过研究干料粉率对干混砂浆用水量及稠度损失率的影响，筛选了干料粉率的合理范围。分析了干混砂浆原材料掺量对干混砂浆的综合性能的影响，提出了配制干混砂浆的关键技术参数为细度模数、干料粉率及砂浆用水量。通过对砌筑砂浆和抹灰砂浆的试配试验，，说明砌筑砂浆MH0630-13、MH0705-33和抹灰砂浆PH0730-25、PH0506-41的综合性能具有一定的优势，分别可作为配制人工砌筑砂浆（或再生砌筑砂浆）DMM5、DMM7.5和人工抹灰砂浆（或再生抹灰砂浆）DPM5、DPM10的基准砂浆。以黄砂为基准，优化设计了人工混合砂和再生混合砂的颗粒级配，研究了黄砂替代率分别为30%和50%混合砂对干混砂浆综合性能的影响。结果表明，人工干混砌筑砂浆DMM5的黄砂最佳替代率为50%，人工干混抹灰砂浆DPM5的黄砂最佳替代率为30%。再生干混砂浆的综合性能虽不及基准砂浆，但替代率为30%、50%所配制的再生干混砂浆均符合国家标准要求的干混砂浆性能指标。在普通干混砂浆产品的推广过程中，天然砂资源短缺、胶凝材料品种的选择以及外加剂成本高等问题导致干混砂浆在原材料来源以及生产成本上明显高于传统砂浆，制约了建筑干混砂浆行业发展。因此，对其原材料的技术指标分析以及寻找河砂的替代材料（人工砂和再生砂）具有重要的现实意义。通过研究原材料掺量及相关技术参数对不同品种干混砂浆性能的影响，有利于探索建筑工程砂浆品种的选择，对干混砂浆的应用市场具有广泛前景。
[Abstract]:Dry mixing mortar is a new type of building mortar, which is composed of cementing material, fine aggregate, admixture and admixture according to certain proportion. It has the advantages of stable quality, variety, easy construction, green environmental protection and so on. The performance index of raw materials for dry mixing mortar is analyzed in this paper. The correlation between cement properties and dry mortar properties was studied. The results show that the strength of dry mixing mortar does not increase with the increase of cement strength, but is related to the content of cement or powder. The water consumption of dry-mixed mortar does not increase with the increase of the standard consistency of cement, and the influence of the initial setting time of cement on the setting time of dry mortar does not change regularly. The concept of dry mixing mortar dry powder ratio is put forward and the factors influencing dry mix mortar dry mix powder ratio are discussed. In this paper, the particle gradation analysis of various kinds of fine aggregate (yellow sand, artificial sand, recycled sand) was carried out, and the effect of fineness modulus of various fine aggregate on the dry powder ratio of mortar was studied. By studying the effect of dry powder ratio on water consumption and consistency loss rate of dry mixing mortar, the reasonable range of dry mix powder ratio was selected. The effect of raw material content of dry mixing mortar on the comprehensive properties of dry mixed mortar is analyzed. The key technical parameters of dry mixing mortar are fineness modulus, dry powder ratio and water consumption of mortar. Through the test of masonry mortar and plastering mortar, it is shown that the comprehensive properties of masonry mortar MH0630-13,MH0705-33 and plastering mortar PH0730-25,PH0506-41 have certain advantages. It can be used as the reference mortar for the preparation of artificial masonry mortar (or recycled masonry mortar) DMM5,DMM7.5 and artificial plastering mortar (or recycled plastering mortar) DPM5,DPM10 respectively. Based on yellow sand, the particle gradation of artificial mixed sand and recycled mixed sand was optimized, and the influence of 30% and 50% mixed sand on the comprehensive properties of dry mixed mortar was studied. The results show that the best replacement rate of yellow sand for DMM5 is 50 and that for DPM5 is 30. Although the comprehensive performance of recycled dry mixed mortar is not as good as that of reference mortar, the recycled dry mixed mortar prepared with a substitution rate of 30% and 50% conforms to the performance index of dry mixed mortar which is required by the national standard. In the process of popularizing ordinary dry mixing mortar products, the shortage of natural sand resources, the selection of cementitious materials and the high cost of admixtures lead to a higher raw material source and production cost of dry mixed mortar than that of traditional mortar. It restricts the development of building dry mixing mortar industry. Therefore, it is of great practical significance to analyze the technical indexes of raw materials and to find alternative materials (artificial sand and recycled sand) for river sand. By studying the effect of raw material content and related technical parameters on the properties of different kinds of dry mortar, it is helpful to explore the selection of building engineering mortar, and has a broad prospect for the application market of dry mixed mortar.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU578.1

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