干旱区生态环境知识资源中心(Arid): Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand

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DOI	10.3390/su13148017
	Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand
	El-Hassan, Hilal; Medljy, Jamal; El-Maaddawy, Tamer
通讯作者	El-Hassan, H (corresponding author), UAE Univ, Dept Civil & Environm Engn, Al Ain 15551, U Arab Emirates.
来源期刊	SUSTAINABILITY
EISSN	2071-1050
出版年	2021
卷号	13 期号:14
英文摘要	Reutilizing industrial by-products and recycled concrete aggregates (RCA) to replace cement and natural aggregates (NA) in concrete is becoming increasingly important for sustainable development. Yet, experimental evidence is needed prior to the widespread use of this sustainable concrete by the construction industry. This study examines the performance of alkali-activated slag concrete made with RCA and reinforced with steel fibers. Natural coarse aggregates were replaced with RCA. Steel fibers were added to mixes incorporating RCA at different volume fractions. Desert dune sand was used as fine aggregate. The mechanical and durability properties of plain and steel fiber-reinforced concrete made with RCA were experimentally examined. The results showed that the compressive strength did not decrease in plain concrete mixes with 30 and 70% RCA replacement. However, full replacement of NA with RCA resulted in a 20% reduction in the compressive strength of the plain mix. In fact, 100% RCA mixes could only be produced with compressive strength comparable to that of an NA-based control mix in conjunction with 2% steel fiber, by volume. In turn, at least 1% steel fiber, by volume, was required to maintain comparable splitting tensile strength. Furthermore, RCA replacement led to higher water absorption and sorptivity and lower bulk resistivity, ultrasonic pulse velocity, and abrasion resistance. Steel fiber incorporation in RCA-based mixes densified the concrete and improved its resistance to abrasion, water permeation, and transport, thereby enhancing its mechanical properties to exceed that of the NA-based counterpart. The hardened properties were correlated to 28-day cylinder compressive strength through analytical regression models.
英文关键词	alkali-activated slag steel fibers dune sand recycled concrete aggregate hardened properties analytical regression model
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000677135500001
WOS关键词	FLY-ASH ; MECHANICAL-PROPERTIES ; COARSE AGGREGATE ; DURABILITY PROPERTIES ; GEOPOLYMER CONCRETE ; DEMOLITION WASTE ; PERFORMANCE ; BEHAVIOR ; CEMENT ; MICROSTRUCTURE
WOS类目	Green & Sustainable Science & Technology ; Environmental Sciences ; Environmental Studies
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364739
作者单位	[El-Hassan, Hilal; Medljy, Jamal; El-Maaddawy, Tamer] UAE Univ, Dept Civil & Environm Engn, Al Ain 15551, U Arab Emirates
推荐引用方式 GB/T 7714	El-Hassan, Hilal,Medljy, Jamal,El-Maaddawy, Tamer. Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand[J],2021,13(14).
APA	El-Hassan, Hilal,Medljy, Jamal,&El-Maaddawy, Tamer.(2021).Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand.SUSTAINABILITY,13(14).
MLA	El-Hassan, Hilal,et al."Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand".SUSTAINABILITY 13.14(2021).