【摘要】 针对严寒地区水工混凝土的抗冻性,研究了水工混凝土在冻融温度变化范围为（8±2）℃^-17±2℃和（8±2）℃^-22±2℃下的抗冻性能,通过测量试件的质量损失、动弹性模量和抗折强度（即混凝土抗冻性能的评判标准）来评定严寒地区水工混凝土的抗冻性能.实验结果表明,当水工混凝土水灰比为0.5、含气量为5%时,其抗冻标号为F300,满足设计要求;相同配合比的混凝土在严寒地区时,其抗冻标号为F200,达不到设计要求.严寒地区的最低冻结温度对于混凝土的抗冻性能,尤其是质量和动弹性模量的影响十分显著.更多还原

【Abstract】 Aiming at the frost resistance of hydraulic concrete in severe cold region,the frost resistance of hydraulic concrete under the freezing and thawing temperature ranging from( 8 ± 2) ℃ to(- 17 ± 2) ℃and from( 8 ± 2) ℃ to(- 22 ± 2) ℃ was studied. Through measuring such evaluation criteria of frost resistance of concrete as the mass loss,dynamic elastic modulus and flexural strength of specimens,the frost resistance of hydraulic concrete in severe cold region was evaluated. The experimental results showthat when the water-cement ratio of hydraulic concrete is 0. 5 and the air content is 5%,the frost resistance label is F300,which can meet the design requirement. But for the concrete with the same mixture ratio,the frost resistance label in severe cold region is F200,which can not meet the design requirement. In severe cold region,the lowest freezing temperature of concrete has significant effect on the frost resistance of concrete,especially the mass and dynamic elastic modulus.更多还原