东南大学学报（自然科学版）Issue(5)：1046-1051,6.DOI:10.3969/j.issn.1001-0505.2014.05.030
高原低气压环境对新拌混凝土含气量的影响
Effect of low-pressure in plateau environment on air content of fresh concrete
摘要
Abstract
The effect of air pressure of environment on air content of fresh concrete was studied using low-pressure test chamber to stimulate the plateau environment.The experimental results indi-cate that the air pressure of environment has a significant impact on the performance of air-entraining agents.The air content of fresh concrete falls by roughly 20% to 49% when the air pressure is 50 kPa.The air content of fresh concrete decreases linearly with the drop of air pressure.The higher the air content of fresh concrete mixed in ordinary pressure,the faster the air content of fresh concrete decreases with the drop of air pressure.The concrete with high slump shows better resistance to drop of air-content due to low air pressure than the concrete with low slump.Therefore,in order to meet the design requirements of air content of air-entrained concrete for different constructions in the plat-eau regions,it is necessary to increase the dosages of air-entraining agents according to different pressure conditions and types of air-entraining agent.关键词
高原/低气压/含气量/引气混凝土Key words
plateau region/low-pressure/air content/air-entrained concrete分类
建筑与水利引用本文复制引用
李雪峰,付智,罗翥,柯国炬..高原低气压环境对新拌混凝土含气量的影响[J].东南大学学报（自然科学版）,2014,(5):1046-1051,6.基金项目
国家自然科学基金资助项目（51308246）、交通运输部科技资助项目（201231879210）． （）
