Mechanical strength and drying shrinkage properties of concrete containing treated coarse recycled concrete aggregates

Impact Resistance of Recycled Aggregate Concrete with Single and Hybrid Fibers

“…They are then impregnated with wollastonite solution. The details on the materials and procedures involved in this treatment process were described in our previous research [8]. Table 1 provides a comparison of the properties of coarse natural aggregate (granite) and coarse treated and untreated RCA in terms of physical and mechanical strength characteristics.…”

“…The steel ball was dropped repeatedly till the ultimate failure of the test specimens. The detail of the instrument involve and test set up of impact resistance test should refer to the references [8]. The impact resistance of the concrete plates was determined by measuring the energy absorbed by the fracture of the specimen, which was impacted by a steel ball through a certain number of blows that cause its ultimate failure.…”

“…In a research conducted by Rao et al [7] on RAC under drop weight impact load, the impact resistance of RAC was found to decrease proportionally with the increase in RCA replacement level. Ismail and Ramli [8] observed that the impact resistance of RAC beams with treated RCA tends to improve slightly compared with that of RAC beams with untreated RCA. In practice, a concrete structure is designed with high impact resistance criteria to serve in areas subjected to high repeated impact loads, such as during an earthquake, missile impact and explosion, transportation and barrier structures subjected to vehicle crash impact, impact of water wave motions on offshore structure, rock falling and etc.…”

“…The present study mainly aims to evaluate the contributions of various fiber-reinforced systems in enhancing the energy absorption and/or impact resistance capacities of RAC beams. The mix proportion of RAC consisted of treated coarse RCA, as developed in our previous research [8]. This mix proportion can further diversify the RAC content through the inclusion of various fiber-reinforced systems.…”

Toward Sustainable Construction: Use of recycled aggregate in concrete in Malaysia

“…Physically, RA is composed of original aggregates with remains of a certain amount of mortar (cement paste) adhering to the aggregate particles. The presence of adhered mortar is relatively more porous and thus make the properties of RA has higher water absorption and lower strength characteristic compare to NA (Ismail & Ramli, 2014;Padmini et al, 2009;Surya, et al, 2013). Consequently, the incorporation of RA in concrete mixes can crucially affect on the concrete performance.…”