Relationships between microstructure and transport properties in mortar containing recycled ceramic powder

JOURNAL OF CLEANER PRODUCTION

卷:263

Article

Li, Le¹  Liu, Wenfeng¹  You, Qinxi¹  Chen, Mengcheng¹  Zeng, Qiang²  Zhou, Chunsheng³  Zhang, Mingzhong⁴ 

[1] East China Jiao Tong Univ, Dept Civil Engn & Architecture, Nanchang 330013, Peoples R China

[2] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China

[3] Harbin Inst Technol, Dept Civil Engn, Harbin 150090, Peoples R China

[4] UCL, Dept Civil Environm & Geomat Engn, London WC1E 6BT, England

关键词: Ceramic powder;    Mortar;    Microstructure;    Gas permeability;    Sorptivity;    Sustainability;   

DOI  :  10.1016/j.jclepro.2020.121384

来源: Elsevier

【 摘 要 】

Sustainable utilization of ceramic wastes in construction has gained increasing interest, but the microstructure and transport properties of ceramic-modified construction materials remain to be explored before in-situ engineering application. This paper presents an experimental study on microstructure, mechanical properties and transport properties of cement mortars containing different percentages of ceramic powders (CPs) up to 40%. Microstructure of CP-cement mortars was measured using mercury intrusion porosimetry, water vapor sorption isotherm and scanning electron microscopy techniques. Mechanical properties including compressive strength and flexural strength as well as transport properties including gas permeability and capillary sorptivity were measured. Results indicate that ceramic powder can greatly refine the pore structure of CP-cement mortars. Because of the homogenization and densification effects of ceramic powder on mortar matrices and interfacial transition zones, the compressive and flexural strengths of CP-cement mortars at 180 d are around 80 MPa and 10 MPa, respectively. Both gas permeability and capillary sorptivity decrease substantially as ceramic powder content increases and exhibit linear correlations with pore structure characteristics such as total porosity and critical pore size. Ceramic powder can lower the manufacture costs of concrete and obtain better durability. Therefore, ceramic powder can be considered as a promising supplementary material to develop sustainable and durable cement-based materials for future engineering applications. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free