CAJ | 학술논문

为解决泡沫混凝土因收缩而开裂的问题,在水灰比为0．33和0．50的情况下,通过测定泡沫混凝土的干缩值和自收缩值,结合压汞法、氮吸附法及 XRD等测试手段,研究了减缩剂(S1与 S2)对 A08级泡沫混凝土孔结构、干缩及自收缩的影响.结果表明,泡沫混凝土失水和干缩主要集中在7d 以内；当水灰比为0．33时,减缩剂可使泡沫混凝土28 d干缩值和自收缩值降低55．3％和48．9％；当水灰比为0．50时,减缩剂可降低泡沫混凝土28 d干缩59．1％,与环境隔离的条件下,泡沫混凝土存在微膨胀现象；水灰比为0．33和0．50,掺入 S1使泡沫混凝土毛细孔数量减少；水灰比为0．33时,S2掺入使30 nm 左右的大的毛细孔数量增多,小的毛细孔数量减少,而水灰比为0．50时,利于小于4 nm的小的毛细孔形成.
위해결포말혼응토인수축이개렬적문제,재수회비위0．33화0．50적정황하,통과측정포말혼응토적간축치화자수축치,결합압홍법、담흡부법급 XRD등측시수단,연구료감축제(S1여 S2)대 A08급포말혼응토공결구、간축급자수축적영향.결과표명,포말혼응토실수화간축주요집중재7d 이내；당수회비위0．33시,감축제가사포말혼응토28 d간축치화자수축치강저55．3％화48．9％；당수회비위0．50시,감축제가강저포말혼응토28 d간축59．1％,여배경격리적조건하,포말혼응토존재미팽창현상；수회비위0．33화0．50,참입 S1사포말혼응토모세공수량감소；수회비위0．33시,S2참입사30 nm 좌우적대적모세공수량증다,소적모세공수량감소,이수회비위0．50시,리우소우4 nm적소적모세공형성.
To prevent cracking caused by shrinkage,pore structure,drying shrinkage and autogenous shrinkage of foamed concrete with SRA (S1 and S2),were studied by testing drying shrinkage and autogenous shrinkage and analyzed by MIP,BET,XRD,when W/C were 0.33 and 0.50.The result showed that water loss and drying shrinkage of foamed concrete appeared mostly in the early 7 d.The decreased values of drying shrinkage and au-togenous shrinkage of 28 d on foamed concrete were up to 55.3% and 48.9%,when W/C was 0.33.With W/C 0.50,drying shrinkage of 28 d on foamed concrete decreased by 59.1% to the most.And tiny expansion of foamed concrete happened when it was isolated from outside.The number of capillary pores in foamed concrete was decreased by adding S1 with W/C 0.33 and 0.50.When W/C was 0.33,the number of small capillary pores reduced by adding S2,but the big ones with the pore size of about 30 nm increased.When W/C was 0.50,S2 benefited to increasing the number of small capillary pores less than 4 nm.