New Mix Design Method for Recycled Concrete Using Mixed Source Concrete Coarse Aggregate
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ORIGINAL PAPER
New Mix Design Method for Recycled Concrete Using Mixed Source Concrete Coarse Aggregate Xiaomeng Ding1 · Jianli Hao2 · Zhongfan Chen1 · Jianan Qi1 · Meloni Marco1 Received: 30 October 2019 / Accepted: 16 April 2020 © Springer Nature B.V. 2020
Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be pre-wetted before casting. Its weighted mean strength has a value of 43.1 MPa for two strengths of SC. Compressive and splitting tensile strength tests on recycled concrete with CRCA (100% substituting limestone aggregate) made from two mixed SC with varying strengths, have been implemented to acquire the mix design method. For investigating the influence of CRCA from two strengths of SC on recycled concrete performance, test parameters of mechanical behavior including compressive strength of SC, strength difference between two mixes of SC, and proportion of two mixed CRCA were taken into account. Test results indicate that when one of the two mixed SC strengths is similar to the target strength, two requirements have to be satisfied to achieve the target compressive strength: one of the SC has to be more than 10 MPa higher than the target strength, and the proportion of the higher strength SC is larger than 75% in weight of the total CRCA. The results provide useful information for recycling multiple strength SC.
* Zhongfan Chen [email protected] Xiaomeng Ding [email protected] Jianli Hao [email protected] Jianan Qi [email protected] Meloni Marco [email protected] 1
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 211189, China
Department of Civil Engineering, Xi’an Jiaotong Liverpool University, Suzhou 215123, China
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Waste and Biomass Valorization
Graphic Abstract
Keywords Coarse recycled concrete aggregate · Source concrete · Compressive strength · Splitting tensile strength · Weighted mean strength
Statement of Novelty The development of civil engineering consumes vast natural sand and stone aggregate, resulting in a shortage of sand and stone resource in some areas. Meanwhile, it brings a mass of construction and demolition waste in the life cycle
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of buildings, which causes serious pollution to the environment. Based on such situation, recycling is an effective method for sustainable development. However, few studies were put into practice on recycled concrete with aggregate crushed from mixed source concrete. In this paper, the definition of source concrete is fully explained. The mixed
Waste and Biomass Valorization
source concrete is not a mixture of concrete and other impurities (glass, rubber, old mortar, brick, rubble, ceramics, etc.) targeted in previous research, but refers to a mixt
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