Preparation of Novel Core-shell Non-sintered Lightweight Aggregate and Its Application in Wallboard for Better Properties

• Published in: Journal of Wuhan University of Technology. Materials science edition 2022-10, Vol.37 (5), p.840-848
• Main Authors: Pang, Chaoming, Zhang, Chunpeng, Meng, Xinxin, Pan, Jinlong
• Format: Article
• Language: English
• Subjects: Bulk density; Cementitious Materials; Chemistry and Materials Science; Compressive strength; Concrete aggregates; Drying; Drywall; Heat transfer; Lightweight concretes; Materials Science; Shrinkage; Sintering (powder metallurgy); Thermal conductivity; Workability
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-022-2605-0

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.