摘要
分别采用物理强化、化学强化和物理-化学复合强化三种不同的强化方式对简单破碎再生粗骨料进行强化处理,并采用100%取代天然碎石制备再生粗骨料混凝土,研究了不同强化处理后的再生粗骨料对混凝土工作性能、力学性能、抗渗透性能和抗碳化性能的影响。结果表明,经过强化处理的再生粗骨料混凝土的各项性能均有不同程度的提高,其中经二次物理强化处理后的再生粗骨料混凝土的用水量较天然碎石混凝土仅增加了6kg/m3,其抗压强度也达到最高值,接近于天然碎石混凝土;经二次物理强化和化学浸渍复合强化处理后的再生混凝土氯离子扩散系数降低了13.6%;三种不同的强化方式处理后,再生混凝土的碳化深度和碳化速度均有所降低。
Three kinds of different strengthening technologies of physical enhancement, chemical enhancement and physical-chemical compound enhancement to strengthen the simple crushing recycled coarse aggregate are adopted, with 100% replaced natural gravel preparation of recycled coarse aggregate concrete, and the influences of the recycled coarse aggregate of different strengthening treatment on the working performance, mechanical properties, penetration resistance and carbonation resistance of concrete are studied. The research results show that, through strengthening treatment, recy- cled coarse aggregate concrete properties are improved to different degrees, the water consumption of recycled coarse ag- gregate concrete after the secondary physical strengthen treatment is only increased by 6kg/m3 than that of natural gravel concrete. The compressive strength also reached the highest value, close to the natural gravel concrete. The chloride ion diffusion coefficient of recycled concrete after the secondary physical-chemical compound strengthening treatment is re- duced by I3.6%. The depth of carbonation and carbonation velocity decrease after three kinds of different strengthening treatments.
出处
《混凝土与水泥制品》
2015年第6期11-17,共7页
China Concrete and Cement Products
基金
国家自然科学基金资助(51378270)
山东省高校优秀科研创新团队计划资助
关键词
再生混凝土
强化处理工艺
用水量
抗压强度
抗渗透
抗碳化
Recycled concrete
Strengthening treatment technology
Water consumption
Compressive strength
Penetration resistance
Carbonation resistance
