寒区加气混凝土自保温墙体材料性能研究

发布时间：2019-01-27 06:15

【摘要】：结合严寒地区建筑节能65%的要求，研究了B05级加气混凝土的制备参数对性能的影响。重点研究了加气混凝土的抗压强度影响因素和降低加气混凝土吸水率的技术措施。 首先研究了加气混凝土的试验室制备工艺，确定了搅拌时间、养护条件、蒸养温度和蒸压时间等参数，为制得优质加气混凝土试块奠定基础。同时，研究了加气混凝土试块中生石灰消化问题和含水率对试块成型的影响。 以强度为主要考核指标，采用正交设计以及试验调整粉煤灰、水泥和铝粉用量，确定了制备B05级加气混凝土的基本配合比为粉煤灰：水泥：石灰：石膏=69：12：15：4，水料比为0.53，减水剂掺量为物料的1‰，铝粉掺量为石灰和水泥总量的0.56%；通过研究复掺引气剂对加气混凝土抗压强度和气孔结构的影响，确定了硅铁合金粉的掺量为铝粉用量的1/4，此时的孔结构分布较为合理；通过研究不同类型混凝土早强剂对加气混凝土性能的影响，，确定了氯化钙掺量为水泥用量的0.25%时，对加气混凝土抗压强度的提高作用最明显；通过掺加聚丙烯纤维，确定了聚丙烯纤维掺量为胶凝材料用量的0.1%时，制得加气混凝土的干密度为518kg/m3，抗压强度为3.6MPa。 同时，针对加气混凝土的吸水率较大，对加气混凝土的施工和保温不利，加气混凝土的抗冻性也较差的特点。本文通过研究不同类型憎水剂对加气混凝土吸水率的影响，结果表明：有机硅类憎水剂能提高加气混凝土浆体的流动性，但使得加气混凝土孔结构变差，可以降低加气混凝土基体的吸水率但并不能降低加气混凝土试块的吸水率；硬脂酸钙会降低加气混凝土吸水率同时也会降低浆体流动性，硬脂酸钙掺量为3.0%时，加气混凝土的吸水率为35.8%。 最后，对加气混凝土的吸水率和抗冻性的关系进行验证。低强度高吸水率的加气混凝土试块抗冻性较差。掺入憎水剂的加气混凝土强度略有降低，掺入硬脂酸钙后，加气混凝土的抗冻性得到改善。
[Abstract]:According to the requirement of building energy saving 65% in severe cold area, the influence of preparation parameters of B05 grade aerated concrete on performance was studied. The factors affecting the compressive strength of aerated concrete and the technical measures to reduce the water absorption rate of aerated concrete are studied. Firstly, the preparation technology of aerated concrete in laboratory was studied, and the parameters such as stirring time, curing condition, steaming temperature and autoclaving time were determined, which laid a foundation for the preparation of high quality aerated concrete test blocks. At the same time, the problem of quicklime digestion in aerated concrete and the effect of moisture content on sample forming were studied. Taking strength as the main test index, adopting orthogonal design and adjusting the dosage of fly ash, cement and aluminum powder, the basic mix ratio of preparing B05 grade aerated concrete is determined as fly ash: cement: lime: gypsum = 69: 12: 15: 4, The ratio of water to material is 0.53, the amount of water reducing agent is 1 鈥

本文编号：2415995