李梅时1,孙小巍1,吴陶俊2
聚氨酯对蒸压加气混凝土性能影响的研究
李梅时1,孙小巍1,吴陶俊2
摘 要:通过对聚氨酯蒸压加气混凝土性能的测试,研究了聚氨酯掺量对蒸压加气混凝土比强度、吸水率、抗冻性的影响。并利用X射线衍射和扫描电镜等分析方法分析了不同聚氨酯掺量下的蒸压加气混凝土的水化产物和结构特点。研究发现:聚氨酯能提高蒸压加气混凝土的比强度;聚氨酯的掺量在6%左右,比强度有显著提高;聚氨酯掺量在6%左右对抗冻性有显著改善,15次冻融循环后的质量损失率和强度损失率分别为3.249%和16.43%;水化产物以托勃莫来石和C-S-H为主;加入聚氨酯后没有引起蒸压加气混凝土表观密度的明显增加。Abstract: Through the physical properties test of polyurethane autoclaved aerated concrete, the influence of different polyurethane content on strength, water absorption, frost resistance of autoclaved aerated concrete is studied. The hydration products and structural characters of autoclaved aerated concrete with different content are analyzed by XRD and SEM. The experimental results show that polyurethane can enhance the strength of autoclaved aerated concrete, and the strength is enhanced obviously when the polyurethane content is 6%; the frost resistance is improved obviously when the polyurethane content is 6%, and the mass loss rate and strength loss rate after 15 times freezing-thawing cycles are 3.249% and 16.43% respectively; the hydration products mainly contain tobermorite and C-S-H; the apparent density of samples are not increasing obviously when polyurethane is used.
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