憎水处理SAP对混凝土抗渗抗冻性的影响

发布时间：2018-03-25 20:11

本文选题：SAP　切入点：预吸水　出处：《哈尔滨工业大学》2014年硕士论文

【摘要】：如今混凝土的耐久性问题受到越来越多的重视，向混凝土内部引气能提高混凝土的抗冻性已经得到普遍认可，引气过多却又带来抗渗性的问题，提高混凝土的密实度可以提高混凝土的抗渗性，良好的养护条件可以使得胶凝材料水化更加完全，从而提高密实度，传统的养护费时费力不经济，而且养护效果欠佳，引入内养护材料高吸水性树脂（SAP）能很好解决这个问题。此外，向混凝土内部掺入渗透性有机硅憎水剂能极大提高混凝土的抗渗性。本文将内养护和憎水这两种抗冻抗渗性措施，通过向混凝土内部掺入吸入憎水剂溶液SAP的方式有机地结合起来，首先通过试验探究了SAP预吸水后加入与直接加入憎水剂溶液两种方式的优缺点，确定了预吸水的处理方式并得出合理的预吸150~300μm SAP的饱和吸液量的50%最为合理，其次研究了不同浓度憎水剂对SAP处理后的内养护和憎水效果，选出了处理SAP前憎水剂A溶液的最佳浓度是10%，憎水剂B溶液的最佳浓度是16.6%，，再次通过研究不同因素组合对混凝土抗压强度、吸水率、电通量的影响规律，由混凝土抗压强度试验得出最合理的SAP掺量为0.15%，混凝土电通量和吸水率试验综合说明了粒径范围在80~150μm较为合理，最后通过混凝土冻融循环试验得出掺入经过憎水剂A处理的SAP，混凝土的抗冻性最佳。
[Abstract]:Nowadays, more and more attention has been paid to the durability of concrete. It is generally accepted that entrainment to concrete can improve the frost resistance of concrete, but too much air entraining has brought about the problem of impermeability. Improving the compactness of concrete can improve the impermeability of concrete, and the good curing conditions can make the hydration of the cementing material more complete, thus increasing the compactness. The traditional curing is time-consuming and uneconomical, and the curing effect is not good. The introduction of high absorbent resin (SAP) can solve this problem very well. In addition, adding permeable silicone hydrophobic agent into concrete can greatly improve the impermeability of concrete. In this paper, two kinds of anti-freezing and impermeability measures, internal curing and hydrophobicity, are organically combined by the way of inhaling hydrophobic agent solution SAP into the concrete. Firstly, the advantages and disadvantages of adding water repellent solution and adding hydrophobic agent solution to SAP were investigated through experiments. The treatment method of pre-absorbent water was determined and 50% of the saturated liquid absorption of 150m SAP was obtained. Secondly, the internal curing and hydrophobic effects of different concentrations of hydrophobic agents on SAP were studied. The optimum concentration of hydrophobic agent A solution and hydrophobic agent B solution before SAP treatment is 10 and 16.6. the influence of different factors on the compressive strength, water absorption and electric flux of concrete is studied again. According to the compressive strength test of concrete, the most reasonable content of SAP is 0.15. The test of electric flux and water absorption of concrete shows that the particle size is reasonable in the range of 80 ~ 150 渭 m. Finally, through the freeze-thaw cycle test of concrete, it is concluded that the frost resistance of concrete is the best when SAP is mixed with hydrophobic agent A.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

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