聚合乳液改性轻骨料混凝土梁受弯性能试验研究
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摘要
通过聚合乳液浸泡轻骨料混凝土可以有效改善轻骨料混凝土的耐久性能。通过聚合乳液改性轻骨料混凝土梁的受弯性能试验,系统研究了海水浸泡和海水干湿循环两种海洋环境下该梁的受弯性能。试验结果表明:聚合乳液改性轻骨料混凝土梁的裂缝开展和破坏情况和轻骨料混凝土梁的基本相同;在正常环境、海水浸泡和干湿循环环境下,聚合乳液改性轻骨料混凝土梁的极限承载力相比轻骨料混凝土梁分别增长了4.4%、9.9%、13.1%,经过海水浸泡和干湿循环后的聚合乳液改性轻骨料混凝土梁的极限承载力与正常环境下的基本相同。试验结果为聚合乳液改性轻骨料混凝土梁在海洋工程中的应用提供了一定依据。
Soaking the lightweight aggregate concrete by polymerization emulsion can effectively improve the durability of lightweight aggregate concrete.The bending behavior of lightweight aggregate concrete beams polymerized by emulsion polymerization was studied systematically.The flexural behavior of the beam under both seawater immersion and seawater wet-dry cycles was systematically studied.The results show that the initiation and failure of cracks in polymerized emulsion modified lightweight aggregate concrete beams are basically the same as those of lightweight aggregate concrete beams.Under normal circumstances,seawater immersion and wet-dry cycles,the polymerization emulsion modified lightweight aggregate concrete ultimate bearing capacity of beams increased by 4.4%,9.9% and 13.1% respectively compared with that of light-weight concrete beams.The ultimate load-bearing capacity of polymer latex modified light-weight aggregate concrete beams subjected to seawater immersion and wet-dry cycles is basically the same as in normal environment.The experimental results provide some evidences for the application of polymerized emulsion modified lightweight aggregate concrete beams in offshore engineering.
Soaking the lightweight aggregate concrete by polymerization emulsion can effectively improve the durability of lightweight aggregate concrete.The bending behavior of lightweight aggregate concrete beams polymerized by emulsion polymerization was studied systematically.The flexural behavior of the beam under both seawater immersion and seawater wet-dry cycles was systematically studied.The results show that the initiation and failure of cracks in polymerized emulsion modified lightweight aggregate concrete beams are basically the same as those of lightweight aggregate concrete beams.Under normal circumstances,seawater immersion and wet-dry cycles,the polymerization emulsion modified lightweight aggregate concrete ultimate bearing capacity of beams increased by 4.4%,9.9% and 13.1% respectively compared with that of light-weight concrete beams.The ultimate load-bearing capacity of polymer latex modified light-weight aggregate concrete beams subjected to seawater immersion and wet-dry cycles is basically the same as in normal environment.The experimental results provide some evidences for the application of polymerized emulsion modified lightweight aggregate concrete beams in offshore engineering.
引文
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[3]焦楚杰,高俊岳,王龙,等.轻骨料混凝土的研究进展[J].混凝土,2014(8):111-114.
[4]高建明,董祥,蒋亚清,等.聚合物乳液对纤维增强轻集料混凝土力学性能的影响[J].东南大学学报(自然科学版),2006,36(2):288-292.
[5]ROSSIGNOLO J A,AGNESINI M V C.Mechanical properties of polymer-modified lightweight aggregate concrete[J].Cement&Concrete Research,2002,32(3):329-334.
[6]ROSSIGNOLO J A,AGNESINI M V C.Durability of polymermodified lightweight aggregate concrete[J].Cement&Concrete Composites,2004,26(4):375-380.
[7]王涛.高强轻集料混凝土的脆性与增韧技术研究[D].武汉:武汉理工大学,2004.
[8]范小春,胡宜昌,孟阳.改性轻骨料混凝土基本力学性能试验研究[J].混凝土,2017(11):94-99.
[9]Standard practice for the preparation of substitute ocean water:ATSM D1141-1998[S].Astm,2003.
[10]吴庆令.海洋环境钢筋混凝土受弯构件的耐久性与寿命预测[D].南京:南京航空航天大学,2010.
[11]吴金海.海洋环境下混凝土结构耐久性研究[D].杭州:浙江大学,2004.
[12]刘香,银俊,何玉青.轻骨料混凝土梁受弯性能研究[J].施工技术,2010(s1):625-627.
[13]杜朝华.再生骨料混凝土梁受弯性能试验研究[J].混凝土,2012(3):77-80.
[14]姜从盛.轻质高强混凝土脆性机理与改性研究[D].武汉:武汉理工大学,2010.