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Appl. Sci. 2018, 8(8), 1324; https://doi.org/10.3390/app8081324

Influence of Aggregate Gradation on the Engineering Properties of Lightweight Aggregate Concrete

1
Department of Civil Engineering, National Chung-Hsing University, No.250, Kuo Kuang Road, Taichung 402, Taiwan
2
Department of Civil Engineering, Chienkuo Technology University, No.1, Chiehshou North Road, Chunghau City 500, Taiwan
*
Author to whom correspondence should be addressed.
Received: 29 July 2018 / Revised: 6 August 2018 / Accepted: 6 August 2018 / Published: 8 August 2018
(This article belongs to the Section Materials)
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Abstract

Expanded shale lightweight aggregates, as the coarse aggregates, were used to produce lightweight aggregate concrete (LWAC) in this research. At the fixed water-cement ratio, paste quantity, and aggregate volume, the effects of various aggregate gradations on the engineering properties of LWAC were investigated. Comparisons to normal-weight concrete (NWC) made under the same conditions were carried out. From the experimental results, using normal weight aggregates that follow the specification requirements (standard gradation) obtained similar NWC compressive strength to that using uniform-sized aggregates. However, the compressive strength of LWAC made using small uniform-sized aggregates was superior to that made from standard-grade aggregates. This is especially conspicuous under the low water-cement ratio. Even though the workability was affected, this problem could be overcome with developed chemical additive technology. The durability properties of concrete were approximately equal. Therefore, it is suggested that the aggregate gradation requirement of LWAC should be distinct from that of NWC. In high strength LWAC proportioning, following the standard gradation suggested by American Society for Testing and Materials (ASTM) is optional. View Full-Text
Keywords: lightweight aggregates; aggregate gradation; standard gradation; uniform-sized aggregates; compressive strength; durability lightweight aggregates; aggregate gradation; standard gradation; uniform-sized aggregates; compressive strength; durability
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Chen, H.-J.; Wu, C.-H. Influence of Aggregate Gradation on the Engineering Properties of Lightweight Aggregate Concrete. Appl. Sci. 2018, 8, 1324.

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