【作者】 郭鹏；

【导师】 张宝生；

【作者基本信息】 哈尔滨工业大学 ， 材料学， 2006， 硕士

【摘要】 本文研究了在路面水泥混凝土中掺入粉煤灰、引气剂和四种无机盐(Na2SO4、NaNO2、Ca(NO2)2和NaCl)后,混凝土的力学性能、抗盐冻剥蚀能力和耐磨性等性能的变化规律。掺粉煤灰混凝土的各项性能在后期(60d后)均有所改善,其中耐磨性在28d时表现了较好的结果。在混凝土中引气后,混凝土的抗压强度下降较多但抗折强度在适宜的含气量范围内(小于5.5%)有所提高,混凝土的抗冻性显著提高,同时不会降低混凝土的耐磨性。掺入不同种类的无机盐后混凝土的各项性能表现出了极大的差异。掺入Na2SO4后混凝土的抗压强度降低但抗折强度有所提高;掺入NaNO2后混凝土抗压强度降低但抗折强度有很大提高;掺入Ca(NO2)2后混凝土抗压强度基本不变但同时也降低了抗折强度;而掺入NaCl后混凝土抗压强度有所降低,抗折强度稍有提高。无机盐对引气混凝土的力学性能影响规律与非引气混凝土一致。抗盐冻剥蚀能力方面,除掺有Ca(NO2)2的混凝土表现了较大的剥落量外,其它的混凝土都有较好的抗盐冻剥蚀能力。而引气混凝土中掺盐后抗盐冻剥蚀能力均有所下降。对于耐磨性,掺有NaNO2和NaCl混凝土的耐磨性稍有降低,其它混凝土的耐磨性基本不变。引气混凝土中掺盐后耐磨性基本不变。更多还原

【Abstract】 Mechanical performance, frost resistance and abrasion resistance of concrete with fly ash, air entraining agent and four kinds of inorganic salts including sodium sulfate, sodium nitrite, calcium nitrite and sodium chloride are mainly studied in this paper.The performance of concrete at the later age (after 60 days) is improved when fly ash is added into concrete, and the abrasion resistance of concrete is perfect at 28 days. Entraining air into concrete, the compressive strength is reduced but the flexural strength is improved when the air content less than 5.5%. The frost resistance of air entraining concrete is improved significantly, while the abrasion resistance of concrete is not decreased. Different kind of inorganic salts have different influence on the performances of concrete. Sodium sulfate can decrease the compressive strength of concrete but increase the flexural strength. Sodium nitrite can decrease the compressive strength of concrete but increase the flexural strength obviously. Calcium nitrite can increase the compressive strength of concrete and decrease the flexural strength. Sodium chloride can decrease the compressive strength of concrete and increase the flexural strength lightly. The influence of inorganic salts on mechanical performance of air entrainment concrete is similar with non-air entraining concrete. All those inorganic salts can improve the frost resistance of concrete except calcium nitrite. However, the frost resistance of air entraining concrete decrease after adding salts. Sodium nitrite and sodium chloride decrease the abrasion resistance of concrete, and other salts have little effect on the abrasion resistance of concrete. The abrasion resistance of air entraining concrete has little changes when salts added into concrete.更多还原