海水-冻融共同作用下透水混凝土性能损伤及寿命预测  

Performance damage and life prediction of pervious concrete under seawater-freeze-thaw coupling

作　　者：闫希雯 王学志[1] 辛明 贺晶晶 YAN Xiwen;WANG Xuezhi;XIN Ming;HE Jingjing(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China;Power China Northwest Engineering Corporation Limited,Xi'an 710065,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121001 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《辽宁工程技术大学学报(自然科学版)》2024年第6期59-70,共12页Journal of Liaoning Technical University (Natural Science)

基　　金：辽宁省教育厅高校基本科研项目(LJKMZ20220979);中国电建集团西北勘测设计研究院课题(XBY-PTKJ-2022-12)。

摘　　要：为提高海水-冻融共同作用下透水混凝土的性能,采用正交试验方法,研究海水-冻融共同作用下矿渣(GBFS)替代率、羟丙基甲基纤维素(HPMC)掺量和聚丙烯塑料钢纤维(PPTF)掺量对透水混凝土宏观性能和微观结构的影响,运用NSGM(1,N)模型预测透水混凝土在海水-冻融共同作用后的相对动弹性模量。研究结果表明:当GBFS替代率为20%,HPMC和PPTF掺量分别为0.15%、0.5%时,透水混凝土的抗海水-冻融侵蚀性能最佳;海水侵蚀产生的膨胀性物质会加快裂缝的延展,PPTF的支撑锚固作用能够抑制裂缝的产生和延伸;NSGM(1,N)模型预测精度的检验指标a在[-3,2)内,平均相对误差为II级误差,可用于相对动弹性模量的长期预测。In order to solve the problem that pervious concrete used in northern coastal cities is susceptible to seawater-freeze-thaw co-action in winter,orthogonal tests were used to investigate the effects of slag(GBFS)substitution rate,hydroxypropylmethylcellulose(HPMC)admixture,and polypropylene imitation steel fiber(PPTF)admixture on macroscopic properties and microstructural changes of the pervious concrete blocks after seawater-freeze-thaw co-action for 25,50,and 75 times,and the NSGM(1,N)model was used to predict the relative dynamic elastic modulus of pervious concrete after seawater-freeze-thaw co-action.The NSGM(1,N)model was applied to predict the relative dynamic elastic modulus of permeable concrete after seawater-freeze-thaw.The results show that the permeable concrete has the best seawater-freeze-thaw resistance when the GBFS substitution ratess 20%and the HPMC and PPTF admixture are 0.15%and 0.5%,respectively;after seawater erosion,the generation of expansive substances accelerated the crack extension,and the supportive anchoring effect of PPTF suppressed the crack generation and extension.The test index a of the prediction accuracy of the NSGM(1,N)model is in[-3,2),and the average relative error is within the range of grade II error.The NSGM(1,N)model can be used for long-term prediction of the relative dynamic elastic modulus.

关 键 词：矿渣 羟丙基甲基纤维素 聚丙烯仿钢纤维 透水混凝土 海水-冻融 NSGM(1 N)模型 

分 类 号：TU528[建筑科学—建筑技术科学]