季节性活动层中混凝土强度与抗冻性显著性分析及预测模型研究  

Significant Analysis and Prediction Model Research on the Concrete Strength and Frost Resistance in Seasonal Frozen Regions

作　　者：张凯[1,2] 王起才 杨子江[1] 郝艺翔 何孟凯[1] 崔宝红 ZHANG Kai;WANG Qi-cai;YANG Zi-jiang;HAO Yi-xiang;HE Meng-kai;CUI Bao-hong(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory of Road&Bridge Disaster Prevention and Control,Lanzhou 730070,China;China Railway 15th Bureau Group First Engineering Co.,Ltd.,Xi an 710018,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [3]中铁十五局集团第一工程有限公司,西安710018

出　　处：《硅酸盐通报》2019年第8期2384-2390,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51268032,51768033);长江学者和创新团队发展计划滚动支持(IRT_15R29);兰州交通大学青年科学基金(2018016)

摘　　要：针对多年冻土季节活动层区铁路、公路线路中桥梁的墩台基础混凝土灌注桩,研究了水胶比、引气剂及养护温度3种因素交互作用下对混凝土抗压强度、抗冻性能的影响,得出了3种因素对混凝土抗压强度及抗冻性能的变化规律,结果表明:水胶比对混凝土的抗压强度影响最明显,养护温度次之,引气剂对抗压强度的影响最小;养护温度对混凝土的抗冻性影响最明显,水胶比次之,引气剂对抗冻性能的影响最小。在混凝土配合比设计和养护方式合理的条件下,混凝土的抗压强度与抗冻性存在一定的相关性,进行冻土中混凝土的施工时,合理设计水胶比,提高混凝土养护质量并且掺加适量引气剂,可以提高混凝土强度和耐久性能,最后建立了混凝土抗压强度和抗冻性能的多元线性回归预测模型,并验证了其合理性。Aimed at cast-in-place pile concrete used on bridge foundation in railways and highways at seasonally active permafrost regions,under the influence of water-binder ratio,air-entraining agent and curing temperature,compressive strength and frost resistance of concrete were studied.The results show that water-binder ratio has the most obvious influence,followed by the curing temperature,and the air entraining agent has the smallest influence;on the frost resistance,the curing temperature has the most obvious in fluence,followed by water-binder ratio,and air entraining agent has the smallest influence;with a reasonable water-binder ratio and high quality curing methods,there is a certain correlation between compressive strength and frost resistance of concrete.In the construction of concrete in frozen soil,optimizing the design of water-binder ratio,improving the quality of curing methods and incorporating moderate air-entraining agent can increase concrete compressive strength and durability.Finally,multiple linear regression prediction model for concrete compressive strength and durability was established and its rationalization was tested.

关 键 词：季节性活动层 抗压强度 抗冻性 显著性分析 

分 类 号：TU528[建筑科学—建筑技术科学]