摘要
为了评价活性粉末混凝土耐硫酸盐和冻融循环耦合破坏作用的性能,本文通过试验测定了不同耦合循环次数下,普硅活性粉末混凝土(P)和高抗活性粉末混凝土(GP)的质量损失率、相对动弹性模量、抗压强度和抗压强度耐腐蚀性系数等物理力学性能指标,并研究了粉煤灰和矿粉替代量对活性粉末混凝土耐硫酸盐和冻融循环耦合破坏作用的影响。试验结果表明,P和GP的质量损失率随耦合循环次数的变化幅度较小,而相对动弹性模量、抗压强度和抗压强度耐腐蚀性系数都随耦合循环次数的增大出现先增大后减小的趋势,当耦合循环次数分别为9次和6次时,P和GP的抗压强度分别达到最大值168.65MPa和157.69MPa;粉煤灰的掺入能明显改善混凝土的耐硫酸盐和冻融循环耦合破坏作用,且当掺量为30%时改善效果最好;矿粉的加入也能改善混凝土的耐硫酸盐和冻融循环耦合破坏作用;相比于相对动弹性模量,抗压强度更适合评价活性粉末混凝土的耐硫酸盐和冻融循环耦合破坏作用的性能。
In order to evaluate the reactive powder concrete resistance to sulfate and freezing-thaw cycle coupling actions, the mass loss rate, relative dynamic elastic modulus, compressive strength and compressive strength of corrosion resistance coefficient of common silica reactive powder concrete（P） and high resistance to reactive powder concrete（GP） in different coupling cycles are determined through the test, and the effects of fly ash and slag substitution amount on the resistance to sulfate and the effect of freezing-thaw cycles coupled damage of reactive powder concrete are studied. The test results show that with the increase of coupling cycles, the mass loss rate of P and GP changes to a less extent, and the relative dynamic corrosion coefficient of elastic modulus, compressive strength and compressive strength of resistance with the number of cycles coupled increasing, first increased and then decreased. When the coupling cycle times are 9 times and 6times, the compressive strength of P and GP reached a maximum at 168.65 MPa and 157.69MPa; the addition of fly ash can improve the sulfate resistance of concrete, as well as the freezing-thaw cycles and coupling actions, and when the addition amount is 30%, the best effect of improving is obtained. Adding the slag can improve the resistance to sulfate and freezingthaw cycle coupling actions of concrete. Compared to the relative dynamic elastic modulus, compressive strength is more suitable for the evaluation of resistance to sulfate and freezing-thaw cycle coupling actions of reactive powder concrete.
出处
《混凝土与水泥制品》
2015年第2期10-15,共6页
China Concrete and Cement Products
基金
河南省科技厅2011年科技发展计划项目(112400450197)
关键词
活性粉末混凝土
物理力学性能
硫酸盐
冻融循环
Reactive powder concrete
Physical and mechanical properties
Reactive powder concrete sulfate
Freezing-thaw cycles
