|
Title |
Mechanical Properties and Predictions of Strength of Concrete Containing Recycled Coarse Aggregates
|
|
DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.2.049 |
|
Keywords |
순환굵은골재 ; 물-시멘트 비 ; 치환율 ; 역학 특성 ; 파괴계수 Recycled coarse aggregate ; Water-cement ratio ; Replacement ratio ; Mechanical properties ; Modulus of rupture |
|
Abstract |
According to KS and Standard Specifications for Concrete, the compressive strength of concrete containing recycled aggregate is limited to 27 MPa and thereafter there are little research on concrete containing recycled aggregate of its compressive strength of greater than 27 MPa. Therefore, to expand the applicability of concrete recycled coarse aggregate(RCA), this paper concerns the mechanical properties of concrete containing RCA with compressive strength ranging from 30 to 60 MPa. The experimental parameters were water-cement ratio and replacement ratio of RCA. Water-cement ratio(w/c) was 0.36, 0.46 and 0.53, and replacement ratio of RCA was 30, 50, 70 and 100%. The experimental results were discussed about compressive strength, elastic modulus, split tensile strength and modulus of rupture. Test results of elastic modulus were compared to the design code predictions. Experimental elastic modulus for concrete with w/c=0.53 decreased by greater than 10% compared with that for concrete with w/c=0.36. The design code predictions for elastic modulus overestimated the experimental results. Whereas, the design code predictions for modulus of rupture underestimated the measured values.
|