Examining Mechanical Properties of Recycled Aggregate Concrete Ali Alsalman 1 , Jamal Khudair 2 , Rahman S. Kareem 3* , Lateef Assi 4 , Canh N Dang 5 , José R. Martí-Vargas 6 {[email protected]¹, [email protected] ², [email protected]³, [email protected] 4 , [email protected] 5 , [email protected] 6 } Tatum-Smith-Welcher Engineers, Inc., 3100 S Market St., Rogers, AR 72758, USA 1 College of Engineering, Civil Engineering Department, Al Maaqal University, Basra, Iraq 1 College of Engineering, Civil Engineering Department, University of Basra, Basra, Iraq 2 University of Arkansas, Department of Civil Engineering, 4190 Bell Engineering Center Fayetteville, AR 72701, USA 3 Department of Structure, Shatrah Technical Institute, Southern Technical University, Shatrah, Dhi Qar, Iraq 3 Department of Civil and Environmental Engineering, University of South Carolina, Columbia, USA 4 Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam 5 Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam 5 Institute of Concrete Science and Technology (ICITECH), Universitat Politecnica de Valencia, Valencia, Spain 6 Abstract. Several mid-strength recycled aggregate concrete (RAC) combinations are developed in this study. Three groups are studied in the experimental section. Natural aggregate concrete (NAC) combinations, for example, employed 100 percent natural gravel aggregate. The second group (RAC-I) mixed natural gravel aggregate with recycled concrete aggregate (30 percent per total weight of coarse aggregates). The compressive strength of the parent concrete was 20-30 MPa. The third group (RAC-II) had a similar and larger percentage of recycled concrete aggregate replacement, ranging from 30% to 100%. The compressive strength of the reference concrete was 30-40 MPa. The results showed that using 30% recycled concrete aggregate had no effect on the workability and mechanical qualities of the concrete. At 112 days, the shrinkage of RAC-I combinations is 40 percent higher than that of NAC mixtures. Based on the results of the emissions analysis, RCA appears to be a viable alternative for reducing CO2 emissions. Keywords: Sustainable Construction; Recycled Concrete Aggregate; Recycled Aggregate Concrete; Compressive Strength; Modulus Of Elasticity; Shrinkage; CO2 Emission. 1 Introduction Construction and demolition wastes account for a large portion of solid wastes. The generation of these wastes has been increasing rapidly worldwide. The annual amount of wastes produced from construction and demolition is about 859 million tons in the EU [1] and about 230-530 million tons in the USA [2]. The most conventional method of disposing of these IMDC-IST 2021, September 07-09, Sakarya, Turkey Copyright © 2022 EAI DOI 10.4108/eai.7-9-2021.2314894
Examining Mechanical Properties of Recycled Aggregate Concrete
May 19, 2023
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