文献类型：期刊文献

英文题名：Advantages and disadvantages of PVA-fibre-reinforced slag- and fly ash-blended geopolymer composites: Engineering properties and microstructure

作者：Deng, Ziming[2,3];Yang, Zhangfeng[1,4];Bian, Jin[1,4];Lin, Jinjia[1];Long, Zhisheng[1];Hong, Guozhi[1];Yang, Zhendi[1];Ye, Yunjing[1]

机构：[1]Guangdong Ocean Univ, Coll Ocean Engn, Zhanjiang 524088, Peoples R China;[2]Univ Manchester, Sch Engn, Dept Mech Aerosp & Civil Engn, Manchester M13 9PL, England;[3]Oxford Rd, Manchester M13 9PL, England;[4]1 Haida Rd, Zhanjiang 524088, Peoples R China

年份：2022

卷号：349

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000860818500001)、、EI(收录号：20223412594874)、Scopus(收录号：2-s2.0-85135888847)、WOS

基金：This project was supported by the Doctor Startup Project of Guangdong Ocean University (Grant No. 120602/060302072104) , the Project of Enhancing School with Innovation of Guangdong Ocean University (Grant No. 230419101) , the Special Topic of Science and Technology Research of Zhanjiang (Grant No. 2019B01017) , the Project of College Students Innovation and Entrepreneurship of Guangdong Ocean University (Grant No. 100102/580520225) , and the Project of Science and Technology Specialist for Enterprise of Guangdong Province-Research on Key Technology of Improving Durability of Recycled Aggregate Concrete (Grant No. GDKTP2021003100) .

语种：英文

外文关键词：Geopolymer composites; PVA fibres; Engineering properties; Microstructure; Advantages and disadvantages

外文摘要：Alkali-activated ground-granulated blast-furnace slag (GGBFS) and fly ash (FA) geopolymers are sustainable alternatives to cement. The incorporation of polyvinyl alcohol (PVA) fibres can help minimise their shortcomings, such as drying shrinkage and brittleness, but may lead to other negative effects. Only a few studies have focused on geopolymer composites based on PVA-fibre-reinforced binary phases (GGBFS and FA). The positive and negative roles of PVA fibres in the performance of composites have not been systemically investigated in previous studies. To promote the application of the composites, the mechanical properties, workability, durability, high-temperature resistance, fibre dispersion, phases, and microstructure of composites with 0, 0.3 and 0.6 vol% of PVA fibres were systematically investigated in this study. The results showed that the incorporation of PVA fibres significantly increased the flexural and splitting tensile strengths of the GGBFS- and FA-blended and single FA-based composites at ambient and high temperatures, and the drying shrinkage was significantly reduced. On the other hand, PVA fibre incorporation caused a decrease in the compressive strength, flowability, consistency, sorptivity, and chloride penetration of the composites; however, the values are still acceptable in construction. Compared to the single FA-based composites, the GGBFS- and FA-blended composites showed improved mechanical properties, sorptivity, chloride resistance, and high-temperature resistance owing to their decreased porosity. This study serves as an important reference for engineers and designers for the use of green composites.