Abstract
This paper investigates the properties of steam cured recycled aggregate concrete (RAC), in an attempt to determine the optimum conditions of the steam-curing cycle for RAC, and incorporating high early strength cement (HESC). Varying conditions of steam curing were employed. The steam-curing cycle was set based on the peak temperature, and the duration for which the peak temperature was maintained. Three peak temperatures were used for steam curing, 50 °C, 60 °C, and 70 °C, maintained for up to two hours. The compressive strength results indicated that the steam-curing cycle employing the peak temperature of 50 °C maintained for one hour with a total duration of four hours was the optimum for strength development, both at the early and late stages of hydration. Determining the optimum steam-curing temperature and duration will help reduce the associated curing cost, thus further economizing the production cost of recycled aggregate concrete.
Highlights
The use of recycled aggregates (RA) in concrete has gained much attention over the previous several decades, due to continuously declining natural resources leading to increasing interest in sustainable development [1,2,3,4]
As the present study primarily focused on the effect of varying steam-curing conditions, the positive effects will be reflected in the hardened concrete
The properties of steam-cured concrete were evaluated in an attempt conditions of a steam-curing steam-curing cycle cycle for for recycled recycled aggregate aggregate concrete, concrete, to determine the optimum conditions incorporating high early strength cement (HESC)
Summary
The use of recycled aggregates (RA) in concrete has gained much attention over the previous several decades, due to continuously declining natural resources leading to increasing interest in sustainable development [1,2,3,4]. Ba et al [28] investigated the effects of steam curing on the strength and porous structure of concrete with a low water/binder ratio They demonstrated experimentally that high temperature steam curing benefits the strength attributes of such concretes, while the exposure duration further augments such characteristics, for up to 14 h total duration of the curing cycle. There are no research findings that report the optimum steam-curing parameters for recycled aggregate concrete (RAC) This parametric study fills these research gaps by investigating the effects of various temperatures and exposure durations on the mechanical strength of steam-cured recycled aggregate concrete. This demands an in-depth evaluation of the RAC properties containing HESC, and the determination of the optimum parameters for the steam-curing cycle This experimental study fills the current research gap by exploring various properties of steam-cured, high early-strength RAC. The novelty of this study lies in the determination of the optimum steam-curing parameters for recycled aggregate concrete, incorporating high early strength cement
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