含水率对再生混凝抗压强度影响研究
|
摘要
为了研究不同含水率状态下富含砖粒再生混凝土的抗压性能,制作了72块强度等级分别为RC20、RC25、RC30富含砖粒再生混凝土立方体试块标准养护28d后将其移入干燥箱中进行干燥处理。将干燥后的立方体试块分别放入清水中浸泡4、12、24、48、72、168、336 h后测量其含水率,并进行单轴抗压力学性能试验。建立再生混凝土强度随其含水率变化的计算模型。研究结果表明:富含砖粒再生混凝土抗压强度随含水率增加而降低,对RC20、RC25、RC30来说,饱和富含砖粒再生混凝土的立方体抗压强度较干燥状态分别降低了33.3%、16.9%、36.9%。
In order to study the compressive properties of brick-enriched recycled concrete at different water content rates,72 blocks of RC20,RC25,RC30 enriched with brick recycled concrete cube standard maintenance 28 d were transferred to the drying box for drying. treatment. The dried cube blocks were soaked in clear water 4 h,12 h,24 h,48 h,72 h,168 h,and 336 h respectively,and their moisture content was measured and the uniaxial pressure resistance mechanical properties were tested. The in?uence of water content on the compressive strength of recycled concrete was studied by experiment. The results show that the compressive strength of brick-rich recycled concrete decreases with increasing moisture content. For RC20,RC25 and RC30,the compressive strength of saturated brickrich recycled concrete cube decreases by 33.3 %,16.9 %,and 36.9 % respectively.
In order to study the compressive properties of brick-enriched recycled concrete at different water content rates,72 blocks of RC20,RC25,RC30 enriched with brick recycled concrete cube standard maintenance 28 d were transferred to the drying box for drying. treatment. The dried cube blocks were soaked in clear water 4 h,12 h,24 h,48 h,72 h,168 h,and 336 h respectively,and their moisture content was measured and the uniaxial pressure resistance mechanical properties were tested. The in?uence of water content on the compressive strength of recycled concrete was studied by experiment. The results show that the compressive strength of brick-rich recycled concrete decreases with increasing moisture content. For RC20,RC25 and RC30,the compressive strength of saturated brickrich recycled concrete cube decreases by 33.3 %,16.9 %,and 36.9 % respectively.
引文
[1]李庆斌,王海龙.水环境对混凝土力学性能的影响研究述评[J].中国科技论文,2006, 1(2):83-94.
[2]王新友,蒋正武,高相东,等.混凝土中水分迁移机理与模型研究评述[J].建筑材料学报,2002, 5(1):66-71.
[3]BOURGEOIS F, SHAG J F, OZANAM O. An elastoplastic model for unsaturated rocks and concrete[J].Mechanics Research Communications, 2002,29(5):383-390.
[4]YAMAN I O,HEARN N a, AKTAN H M. Active and non-active porosity in concrete Part I:Experimental evidence[J]. Material and structure, 2002, 35:102-109.
[5]张国辉,李宗利,聂杭义,等.不同含水率混凝土断裂韧度试验研究[J].水力发电学报,2016,35(2),109-116.
[6]MATSUSHIT A H, ONOUE K. Influence of surface energy on compressive strength of concrete under static and dynamic loading[J] Journal of Advanced Concrete Technology, 2006, 4(3):409-421.
[7]GB/T 50081-2002,普通混凝土力学性能试验方法标准[S].
[8]SL 352-2006,水工混凝土试验规程[S].
[9]陈树建,翟爱良,赵爱华,等.含水率对再生砖骨料混凝土力学性能影响规律试验研究[J].水利与建筑工程学报,2013,11(4):21-23.
[10]安新正,牛薇,张亚飞,等.含砖粒再生混凝土基本性能研究[J].河北工程大学学报:自然科学版,2017, 34(1):30-33.
[11]刘保东,李鹏飞,李琳,等.混凝土含水率对强度影响的试验[J].北京交通大学学报,2011, 35(1):9-12.
[2]王新友,蒋正武,高相东,等.混凝土中水分迁移机理与模型研究评述[J].建筑材料学报,2002, 5(1):66-71.
[3]BOURGEOIS F, SHAG J F, OZANAM O. An elastoplastic model for unsaturated rocks and concrete[J].Mechanics Research Communications, 2002,29(5):383-390.
[4]YAMAN I O,HEARN N a, AKTAN H M. Active and non-active porosity in concrete Part I:Experimental evidence[J]. Material and structure, 2002, 35:102-109.
[5]张国辉,李宗利,聂杭义,等.不同含水率混凝土断裂韧度试验研究[J].水力发电学报,2016,35(2),109-116.
[6]MATSUSHIT A H, ONOUE K. Influence of surface energy on compressive strength of concrete under static and dynamic loading[J] Journal of Advanced Concrete Technology, 2006, 4(3):409-421.
[7]GB/T 50081-2002,普通混凝土力学性能试验方法标准[S].
[8]SL 352-2006,水工混凝土试验规程[S].
[9]陈树建,翟爱良,赵爱华,等.含水率对再生砖骨料混凝土力学性能影响规律试验研究[J].水利与建筑工程学报,2013,11(4):21-23.
[10]安新正,牛薇,张亚飞,等.含砖粒再生混凝土基本性能研究[J].河北工程大学学报:自然科学版,2017, 34(1):30-33.
[11]刘保东,李鹏飞,李琳,等.混凝土含水率对强度影响的试验[J].北京交通大学学报,2011, 35(1):9-12.