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Title: Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete
Authors: Poon, CS 
Shui, ZH
Lam, L
Fok, H
Kou, SC
Keywords: Concrete
Moisture state
Recycled aggregates
Strength development
Issue Date: 2004
Publisher: Pergamon Press
Source: Cement and concrete research, 2004, v. 34, no. 1, p. 31-36 How to cite?
Journal: Cement and concrete research 
Abstract: The influence of moisture states of natural and recycled aggregates on the properties of fresh and hardened concretes was investigated. Concrete mixes were prepared with natural and recycled aggregates at different proportions. The moisture states of the aggregates were controlled at air-dried (AD), oven-dried (OD) and saturated surface-dried (SSD) states prior to use. The ratio of cement to free water was kept constant for all of the mixes. At the fresh state, the slump loss for various concrete mixtures was determined, while the compressive strength was determined after curing for 3, 7 and 28 days. The test results showed that the initial slump values of the concrete mixtures were dependent on the initial free water contents, and the slump loss values of the mixtures were related to the moisture states of the aggregates. Slump loss was significant when 100% AD or OD recycled aggregate was used. The effect of the moisture states of the aggregates on the strength of the concretes prepared with OD and SSD state aggregates at early age (i.e., 3 and 7 days) was noticeable. The concrete prepared with the AD aggregates achieved the highest average strength values at 3, 7 and 28 days. However, at 28 days, the concrete strengths prepared with different types of aggregates were similar. The results suggested that an AD aggregate that contains not more than 50% recycled aggregate is optimum for producing normal strength recycled aggregate concrete.
ISSN: 0008-8846
EISSN: 1873-3948
DOI: 10.1016/S0008-8846(03)00186-8
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