Preparation and Critical Performances of Lightweight Insulation High Ductility Cementitious Composites
DING Cong1, GUO Liping1,2,3, LEI Dongyi1, XU Yanhui1, ZHU Yu1, DENG Zhonghua4
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189 2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189 3 Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing 211189 4 Baohua Lin Industrial Development Co., Ltd., Yongan 366000
Abstract: Lightweight insulation and high ductility cementitious composites (LIHDCC), which density grade reach A10 and strength grade reach C20, were prepared in this study. Mechanical properties, thermal conductivity, uniaxial tensile properties, fiber/matrix interface bonding properties, frost resistance, chloride ion penetration resistance and pore structure were studied. The volume fractions of PVA fiber were 1.5% and 2%. The results showed that the compressive strength decreases with the increase of fiber content, but all could reach C20. The thermal conductivity reached 0.08 W/(m·K) and 0.10 W/(m·K), the ultimate tensile strain reached 0.72% and 0.85%. The average chemical bonding force of single fiber was 6.92 J/m2, the frictional force and slip hardening coefficient were 1.25 MPa and 0.42, respectively. LIHDCC have good resistance for chloride ion penetration and freezing thawing. Finally, the pore structure of LIHDCC was analyzed by CT. The average diameter of the evenly distributed bubbles was about 0—1 mm.
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2019, Vol. 33 
