摘要
【目的】针对再生骨料砂浆粘结界面薄弱/吸水率高等问题,采用有机以及有机与无机复合的内密实外裹浆的方法进行改性。【方法】通过对再生骨料的压碎指标、吸水率、表观密度等性能指标的测试,分析改性前后再生骨料的性能变化,最后探究不同改性方式对再生混凝土力学性能和渗透性能的影响规律及其机理。【结果】结果表明,有机钠盐可以与孔隙中的钙离子反应生成凝胶填充再生骨料的孔隙结构,使得骨料的吸水率降低12.79%,进而提高了混凝土的抗渗透性能,电通量降低37.69%,并且钙离子的加入进一步增强了有机钠盐的改性效果。【结论】浸泡-裹浆复合处理在骨料表面形成核壳层,进一步提高混凝土抗渗透性能,电通量降低至1 283 C,弥补了有机钠盐“单一强化”无法提升力学强度的不足,表现出最高的力学性能。
[Objective] For the problem of weaker bonding interface and higher water absorption, the method of organic filling inside and wrapping pulp outside are used to modify. [Methods] By testing the performance indexes of crushing aggregate, water absorption and apparent density, the changes of aggregate modified before and after are analyzed. The influence mechanism of mechanical properties and anti-permeability of recycled concrete are explored under different modified methods. [Results] The results show that organic sodium salt can react with calcium to generate gel, filling the pore structure of regenerated aggregate, reducing the water absorption of aggregate by 12.79%, enhancing the anti-permeability of concrete by 37.69%.The addition of calcium ion can further improve the modification effect of organic sodium salt. The immersion-wrapping slurry composite treatment forming nuclear shell on the aggregate surface strengthens the anti-permeability of concrete. [Conclusion] The electrical conductance gets reduced to 1 283 C, making up for the lack that the “single strengthening” of organic sodium salt fails to improve the lack of mechanical strength, showing the highest mechanical properties.
作者
王炳监
胥民尧
沈俊宇
陈登
WANG Bingjian;XU Minyao;SHEN Junyu;CHEN Deng(Institute of Civil Engineering,Yancheng Polytechnic College,Yancheng 224005,Jiangsu,China;College of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,Jiangsu,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第1期199-206,共8页
Water Resources and Hydropower Engineering
基金
江苏省高等学校自然科学研究项目(20KJB560007)
安徽省先进建筑材料工程实验室开放课题(JZCL006KF)。
关键词
再生骨料
力学强度
水吸附
渗透性能
recycled aggregates
mechanical strength
water adsorption
permeability properties
