摘要
将内养护技术应用于高强混凝土,能使其具备低收缩性和抗冻耐久性,而确定内养护材料的合理掺量是解决内养护技术推广应用的关键。为此,采用改进的MULTIMOORA方法对内养护高强混凝土的综合性能进行评价,进而确定内养护材料掺量。首先选取吸水树脂(SAP)和轻集料(LWA)2种内养护材料,根据不同内养护材料和不同引水量设计试验方案,通过试验获取其抗压强度、自收缩量和抗冻耐久性指标,并将基于上述指标的综合性能评价问题转化为多属性决策问题;然后采用OWA算子和熵权法分别确定指标主观权重和客观权重;通过耦合得到指标综合权重;最后基于MULTIMOORA对各试验组的综合性能进行评价,利用评价结果确定内养护材料用量。结果表明:该方法评价结果与试验结果较为吻合,其中SAP比LWA内养护效果更好,当SAP掺量以25倍吸水率计算并达到最大总引水量要求时效果最佳。研究成果可为内养护混凝土的综合性能评价提供新的思路。
The application of internal curing technology in high strength concrete can make it have low shrinkage and frost resistance durability.Determining the reasonable content of internal curing materials is the key to popularize the application of internal curing technology.Therefore,the improved MULTIMOORA method was used to evaluate the comprehensive performance of internal curing high-strength concrete,and the content of internal curing material was then determined.Two kinds of internal curing materials,absorbent resin(SAP)and light aggregate(LWA),were selected.Test schemes were designed according to different internal curing materials and different water diversion.The compressive strength,self-shrinkage and frost resistance durability indices were obtained,and the comprehensive performance evaluation problem based on the above indices was transformed into multi-attribute decision making problem.After that,OWA operator and entropy weight method were used to determine the subjective weight and objective weight of the indices,and the comprehensive weight of the index was obtained by coupling.Finally,the comprehensive performance of each test scheme was evaluated based on MULTIMOORA.The amount of internal curing material was determined according to the evaluation results.The results showed that the evaluation results of this method were in good agreement with the test results,and the internal curing effect of SAP was better than that of the LWA.When the content of SAP was calculated by 25 times water absorption and reached the maximum total water intake requirement,the internal curing material showed the best performance.The research results can provide a new idea for the comprehensive performance evaluation of internal curing concrete.
作者
郭利霞
王明华
田园
张亚楠
GUO Lixia;WANG Minghua;TIAN Yuan;ZHANG Yanan(Water Resources Institute,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Henan Key Laboratory of Water Environment Simulation and Treatment,Zhengzhou 450002,China;Public Service Bureau of Hebei Xiong’an New District Management Committee,Xiong’an New District,071000,China)
出处
《人民长江》
北大核心
2020年第11期167-172,共6页
Yangtze River
基金
国家重点研发计划资助项目(2018YFC0406803)
国家自然科学基金青年基金项目(51509020)
水利部堤防安全与病害防治工程技术研究中心开放课题(2018008)。
