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Concrete production consumes large quantities of natural aggregates causing significant damage to the environment. To reduce the amount of natural aggregates used in concrete HRAC is proposed. This is a concrete mix where hemp fibers are incorporated in the mix, the amount of natural coarse aggregates (NCA) is reduced by 20%, and where 50% of NCA are replaced by RCA. HRAC also helps in reducing the problem of construction and demolition wastes (CDW) which are a mixture of surplus materials generated during new construction, renovation, and demolition of buildings, roads, bridges, and other structures (Cheng et al., 2013). A sustainable concrete should be also durable; therefore, it is important to study the effect of the incorporation of hemp fibers and RCA on the durability properties of concrete. Ramli et al. (2013) studied the durability of coconut-fiber-reinforced concrete in aggressive environments. Results showed that the damaging effects of aggressive environments on concrete can be lowered with fiber-reinforced. Awwad et al. (2014) investigated the long-term behavior of concrete incorporating hemp fibers and concluded that at an age of 1.5 years hemp fibers did not have a negative effect on concrete strength . In this paper, the durability of the proposed HRAC is investigated by evaluating its mechanical performance at the age of 2 years and by studying its resistance to freeze-thaw cycles.

Durability Evaluation of Hemp Fibers and Recycled Aggregates Concrete