Gabbro is hard and dense,with high strength and high elastic modulus.However,there is no precedent for the appli-cation of gabbro aggregate in large hydropower projects at home and abroad,and there is a lack of engineering practice experience for reference.The mechanical properties of wet-screened roller compacted concrete specimens cannot truly reflect the mechanical properties of fully-graded roller compacted concrete.Therefore,the evolution law of mechanical properties of fully-graded roller compacted concrete prepared with gabbro aggregate with the maximum particle size of 80 mm was systematically studied,including compressive strength,splitting tensile strength,axial compressive strength and elastic modulus,axial tensile strength and elastic modulus,shear performance,etc.The compressive strength,splitting tensile strength and size effect of wet-screened specimens of fully graded roller compacted concrete were compared and analyzed,and the test results were compared with the development law of mechanical properties of roller compacted concrete in typical domestic projects.In addition,the mechanical properties-curing age evolution function model of compressive strength,splitting tensile strength,axial compression performance and axial tensile performance of full-graded RCC with gabbro aggregate was established.The results show that the development law of compressive strength,splitting tensile strength,shear strength and other mechanical properties of full-graded RCC of gabbro aggregate with age is in line with the general law of mechanical properties development of RCC in similar projects in China.The average size effect coefficient of the compressive strength of C9020W8F100 gabbro full-graded roller compacted concrete specimen and its wet-screened specimen is 0.80,and the average size effect coefficient of the splitting tensile strength is 0.66.The correlation of the mechanical properties models are high(R2 =0.964 3～0.999 2).It is feasible to use gabbro aggregate for the construction of roller compacted concrete dam in large hydropower projects.
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