摘要
Due to the relatively high density of conventional non-sintered lightweight aggregate(NLA),a low-density core-shell NLA(CNLA) was developed.Moreover,two types of porous lightweight aggregate concrete (PLAC) for wallboard were designed,using both foam and lightweight aggregates.The effects of LA on lightweight concrete workability,compressive strength,dry shrinkage,and thermal conductivity were studied and compared.The bulk density of CNLA can be lowered to 500 kg/m^(3),and its cylinder crushing strength is 1.6 MPa.PLACs also have compressive strengths ranging from 7.8 to 11.8 MPa,as well as thermal conductivity coefficients ranging from 0.193 to 0.219 W/(m·K^(-1)).The CNLA bonds better to the paste matrix at the interface transition zone,and CNLA concrete has a superior pore structure than SLA concrete,resulting in a 20% improvement in fluidity,a 10% increase in strength,a 6% reduction in heat conductivity,and an 11% decrease in drying shrinkage.
作者
庞超明
ZHANG Chunpeng
MENG Xinxin
PAN Jinlong
PANG Chaoming;ZHANG Chunpeng;MENG Xinxin;PAN Jinlong(School of Material Science and Engineering,Southeast University,Jiangsu Key Laboratory of Construction Materials,Nanjing,211189,China;Commercial Aircraft Corporation,Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai,200436,China;School of Civil Engineering,Southeast University,Key Laboratory of Concrete and Prestressed Concrete Structure of the Ministry of Education,Nanjing,211189,China)
基金
Funded by the National Key R&D Programs of China (Nos. 2016YFC0701907, 2021YFB3802000 and 2021YFB3802004)。
