轻质保温高延性水泥基复合材料的拉伸性能与耐久性能

doi:10.11896/cldb.18020147

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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.

Key words： lightweight insulation ductility thermal conductivity impermeability freeze-thaw pore analysis

Published: 16 May 2019

CLC number:

TU55

Fund:This work was financially supported by the National Key Research & Development Project of China (2016YFC0401610), National Natural Science Foundations of China (51378113, 51778133), National Basic Research Program of China (973 Program, 2015CB655102), Plan of Six Peak Talents in Jiangsu Pro-vince (JZ-004).

About author:: Cong Ding, Ph. D. candidate, School of Materials Science and Engineering, Southeast University. The main research interests are about high ductility cementitious composites (HDCC).
Liping Guo received her M.E. degree and Ph.D. degree in Materials Science from the Southeast University (SEU) in Sep. 2002—Jun. 2008, and performed research as a co-supervised Ph.D. student supported by China Scholarship Council from Jan. 2007 to Feb. 2008 in Department of Civil Engineering, University of Parma, Italy. She is currently an associate professor and doctoral supervisor in SEU. She was selected for “the Six Talent Peaks project in Jiangsu Province” in 2015 and “the ‘333' project in Jiangsu Province” in 2018. She is also holding some concurrent posts in many societies, e.g. deputy director general of CCPA, member of RILEM TC-SRT committee, director general of RILEM China Branch, member of CCES, and reviewer of some academic journals. Her research interests focus on the design theory and technology of novel fiber reinforced concrete as well as the durability of cement-based composites. She has
taken charge of more than ten scientific research projects, and has published more than 70 journal papers and 18 papers were cited by web of science and applied 40 national invention patents and 13 of them were authorized. She won one Second Class Prize of the Excellent Achievement Award for science and technology progress awarded by the Ministry of Education of China, and one Second Class Prize of the Excellent Achievement Award for science and technology progress awarded by the China Railway Society.

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	DING Cong
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Cite this article:

DING Cong,GUO Liping,LEI Dongyi, et al. Preparation and Critical Performances of Lightweight Insulation High Ductility Cementitious Composites[J]. Materials Reports, 2019, 33(10): 1652-1658.

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http://www.mater-rep.com/EN/10.11896/cldb.18020147 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1652

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