Nano concrete aggregation with steel fibers: A problem to enhance the tensile strength of concreteVan Thuc Ngo, Thanh Quang Khai Lam, Thi My Dung Do and Trong Chuc NguyenE3S Web Conf., 135 (2019) 03001DOI: https://doi.org/10.1051/e3sconf/201913503001