水利水电技术2017，Vol.48Issue(3)：113-118,6.DOI:10.13928/j.cnki.wrahe.2017.03.021
冻融作用下粉煤灰引气混凝土动弹性模量的衰减规律研究
Study on attenuation law of dynamic elastic modulus of fly-ashaerated concrete under freezing-thawing effect
摘要
Abstract
Aiming at the problem that the attenuation of the durability of the hydraulic concrete structure in the cold and arid regions of the Northwest China caused by the long-term freezing-thawing cyclic effect,the changing law of the dynamic performance of concrete under the freezing-thawing effect is taken as the study objective,and then the laws of the effects from the concrete water-cement (binder) ratio,the fly ash mixture,the dosage of air entraining agent and the number of freezing-thawing cycles on the attenuation of the durability of the concrete are studied by taking the relative dynamic elastic modulus of the specimen as the evaluating index with the indoor accelerated test and the relevant theoretical analysis method in accordance with an actual project,for which a attenuation model for the dynamic elastic modulus of concrete is established with the regression analysis method,and based on this model,a life prediction model for the concrete under the effect of the freezing-thawing cycle is built as well.The result shows that by taking 60％ (2.424 × 104MPa) of the initial dynamic modulus,the concrete of the No.5 aqueduct of the Phase Ⅱ Main Channel of Jingtaichuan Pumping lrrigation Project in Gansu Province can withstand the freezing-thawing cycles for 1 502 times,while the safe operation life of the construction materials of the aqueduct is 153 years.The study result provides areference and a basis for the life prediction of concrete structure within the freezing-thawing environment.关键词
混凝土/冻融循环/动弹性模量/耐久性/寿命预测/景泰川提灌工程/甘肃Key words
concrete/freezing-thawing cycle/durability/dynamic elastic modulus/life prediction/Jingtaichuan Pumping Irrigation Project/Gansu Province分类
土木建筑引用本文复制引用
徐存东,谢佳琳,丁廉营,田子荀,刘璐瑶,王国霞..冻融作用下粉煤灰引气混凝土动弹性模量的衰减规律研究[J].水利水电技术,2017,48(3):113-118,6.基金项目
国家自然科学基金资助项目(51279064 （）
51579102) （）
河南省教育厅科技创新人才支持计划(14HASTIT047) （14HASTIT047）
2017年河南省杰出人才支持计划 （）
河南省教育厅科技创新团队支持计划(14IRTSTHN028) （14IRTSTHN028）
华北水利水电大学研究生教育创新计划资助项目(YK2015-01) （YK2015-01）
