Mechanical Strength Properties of RCA Concrete Made by a Modified EMV Method

Namho Kim, Jeonghyeon Kim and Sungchul Yang
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Namho Kim: Department of Architectural Engineering, Korea University of Technology, 1600 Chungjeol-ro, Byeongcheon-myeon Cheonan-si, Chungcheongnam-do 31253, Korea
Jeonghyeon Kim: Department of Architectural Engineering, Korea University of Technology, 1600 Chungjeol-ro, Byeongcheon-myeon Cheonan-si, Chungcheongnam-do 31253, Korea
Sungchul Yang: School of Architectural Engineering, Hongik University, 2639 Sejong-ro, Jochiwon, Sejong 30016, Korea

Sustainability, 2016, vol. 8, issue 9, 1-15

Abstract: This study used two types of Recycled Concrete Aggregates (RCAs) with the same original virgin aggregate, but with different amounts of residual mortars. To verify that the mechanical properties of the concrete were affected by changing the unit volume of residual mortar, fresh mortar, and total mortar of the concrete, a series of paving concrete mixes were made using a modified equivalent mortar volume (EMV) mix design, along with a conventional American Concrete Institute (ACI) mix design. The test results showed that the RCA concrete with the conventional mix design, which led to a prominent decrease in compressive strength and elastic modulus at each age, had 10% greater total mortar volume than that with the modified EMV mix design. As for the conventional ACI mix, it appears that the replacement ratio of RCA and the volume of the residual mortar in RCA directly affect the modulus of elasticity as well as the compressive strength of concrete. However, for the modified EMV mix, the modulus of elasticity of the concrete may be increased to be equivalent to the companion concrete with natural aggregate by controlling the new mortar volume so that the total mortar volume remains the same regardless of the RCA replacement ratio. It was observed that the smaller new volume requirement makes the RCA paving concrete more environmentally friendly and economically profitable.

Keywords: residual mortar; mortar volume; recycled concrete aggregate; compressive strength; elastic modulus (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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