TY - JOUR
T1 - New Mix Design Method for Recycled Concrete Using Mixed Source Concrete Coarse Aggregate
AU - Ding, Xiaomeng
AU - Hao, Jian Li
AU - Chen, Zhongfan
AU - Qi, Jianan
AU - Marco, Meloni
N1 - Funding Information:
This study was supported by the financial support from the National Intensive Research Project of China (No. 2018YFD1100402-05) and the National Natural Science Foundation of China (No. 51908122). The financial support is gratefully appreciated.
Publisher Copyright:
© 2020, Springer Nature B.V.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - 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. Graphic Abstract: [Figure not available: see fulltext.].
AB - 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. Graphic Abstract: [Figure not available: see fulltext.].
KW - Coarse recycled concrete aggregate
KW - Compressive strength
KW - Source concrete
KW - Splitting tensile strength
KW - Weighted mean strength
UR - http://www.scopus.com/inward/record.url?scp=85085072867&partnerID=8YFLogxK
U2 - 10.1007/s12649-020-01073-7
DO - 10.1007/s12649-020-01073-7
M3 - Article
AN - SCOPUS:85085072867
SN - 1877-2641
VL - 11
SP - 5431
EP - 5443
JO - Waste and Biomass Valorization
JF - Waste and Biomass Valorization
IS - 10
ER -