摘要
以膨润土为矿物成孔剂,普通硅酸盐水泥为胶凝材料,制备膨润土/水泥复合多孔材料,结合扫描电镜、氮吸附/脱附等手段,研究了膨胀聚苯乙烯(EPS)轻骨料对膨润土/水泥复合多孔材料收缩的影响。结果表明,EPS轻骨料降低了基体中引起收缩的孔含量,并在其中形成了骨架,显著降低了复合多孔材料的干缩和自收缩;当EPS轻骨料掺量为40%,设计密度分别为400 kg/m^(3)和800 kg/m^(3)时,干缩值分别降低77.9%和64.1%,自收缩分别降低81.2%和89.7%。
Porous bentonite/cement composites were prepared by using ordinary Portland cement as the binder and bentonite slurry as the mineral pore-forming agent.The effect of expanded polystyrene(EPS)lightweight aggregate on shrinkage of bentonite/cement composite was investigated by using the scanning electron microscope and nitrogen adsorption and desorption.The results showed that the introduction of EPS lightweight aggregate reduced the content of shrinkage-generated pore and formed a skeleton,significantly decrease the dry shrinkage and autogenous shrinkage of porous bentonite/cement composite.When the content of EPS lightweight aggregate was 40%,dry shrinkage value reduced by 77.9%and 64.1%,and autogenous shrinkage decreased by 81.2%and 89.7%,with design density of 400 kg/m^(3) and 800 kg/m^(3),respectively.
作者
蒋俊
刘铁
童亮朝
杨迎
管小军
雷洛
丁涛
卢忠远
李军
Jiang Jun;Liu Tie;Tong Liangchao;Yang Ying;Guan Xiaojun;Lei Luo;Ding Tao;Lu Zhongyuan;Li Jun(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang,Sichuan 621010;Ningbo Construction Engineering Group Co.,Ltd.,Ningbo,Zhejiang 315040;Chengdu Communications Investment Construction Co.,Ltd.,Chengdu,Sichuan 610000)
出处
《非金属矿》
CSCD
北大核心
2022年第4期27-30,共4页
Non-Metallic Mines
基金
四川省自然科学基金(2022NSFSC1135)
四川省重大科技专项(2019ZDZX0024)
西南科技大学博士基金(20ZX7102)。
关键词
水泥基多孔材料
孔结构
收缩
膨润土
porous cement-based material
pore structure
shrinkage
bentonite
