9Jamkar S, Rao C. Index of aggregate particle shape and texture of coarse aggregate as a parameter for concrete mix proportioning [ J]. Cement and Concrete Research, 2004, 34 ( 11 ) : 2 021 - 2 027.
10Goncalves J P, Tavares L M, Toledo Filho R D, et al. Comparision of natural and manufactured fine aggregates in cement mor- tars[ J]. Cement and Concret Research, 2007, 37 (6): 924- 932.