摘要
随着建筑固体废弃物排放量逐年增加,传统处理方式面临资源浪费和环境破坏等问题。本文利用再生细骨料和再生细粉制备的自密实砂浆灌注废旧混凝土块石堆积间隙,最终形成再生骨料堆石混凝土。研究结果表明,再生细粉的掺入使自密实砂浆截锥流动度和泌水率分别降低了6.1%~16.7%和7.7%~30.8%。再生细粉取代水泥降低了自密实砂浆7 d抗折强度,但对28和60 d抗折强度影响较小。再生细粉取代再生细骨料在水灰比为0.45时增加了砂浆7和28 d的抗压强度。随着养护龄期延长,堆石混凝土的抗压强度和劈裂抗拉强度的增长速率逐渐降低,再生细粉取代再生细骨料在低水灰比下提高了混凝土抗压强度和劈裂抗拉强度。混凝土的力学强度和抗冻性受到水灰比、胶凝材料含量和骨料级配的影响。
As the emission of construction solid waste increases year by year,the traditional treatment methods are facing problems such as resource waste and environmental damage.Self-compacting mortar prepared from recycled fine aggregate and recycled fine powder was utilized to fill the gaps between waste concrete blocks,ultimately creating recycled aggregate rockfill concrete.Research results indicate that the incorporation of recycled powder reduces the slump flow and bleeding rate of self-compacting mortar by 6.1%~16.7%and 7.7%~30.8%,respectively.Replacing cement with recycled powder reduces the 7 d flexural strength of self-compacting mortar and has little effect on 28 and 60 d flexural strength.The replacement of recycled fine aggregate with recycled powder increases the compressive strength of mortar at 7 and 28 d,when the water-cement ratio is 0.45.The compressive strength and splitting tensile strength of rockfill concrete decrease gradually as the curing age increases.Replacing recycled fine aggregate with recycled powder increases the compressive strength and splitting tensile strength of concrete under a low water-cement ratio.The mechanical strength and frost resistance of concrete are affected by water-cement ratio,cementitious material content and aggregate gradation.
作者
邓鑫
李军
卢忠远
李晓英
侯莉
蒋俊
犹娅
张俊瑾
何科文
DENG Xin;LI Jun;LU Zhongyuan;LI Xiaoying;HOU Li;JIANG Jun;YOU Ya;ZHANG Junjin;HE Kewen(State Key Laboratory of Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Chengdu Shuyuan Gangtai New Building Materials Co.,Ltd.,Chengdu 611743,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第8期2996-3004,共9页
Bulletin of the Chinese Ceramic Society
基金
四川省科技计划项目(2019ZDZX0024)。
关键词
再生骨料
自密实砂浆
堆石混凝土
力学性能
耐久性能
recycled aggregate
self-compacting mortar
rockfill concrete
mechanical property
durability
