Recycled Aggregate Self-curing High-strength Concrete

Abstract

The use of recycled aggregates from demolished constructions as coarse aggregates for concrete becomes a need to reduce the negative effects on the environment. Internal curing is a technique that can be used to provide additional moisture in concrete for more effective hydration of cement to reduce the water evaporation from concrete, increase the water retention capacity of concrete compared to the conventionally cured concrete. High strength concrete as a special concrete type has a high strength with extra properties compared to conventional concrete. In this research, the combination of previous three concrete types to obtain self-curing high-strength concrete cast using coarse recycled aggregates is studied. The effect of varying water reducer admixture and curing agent dosages on both the fresh and hardened concrete properties is studied. The fresh properties are discussed in terms of slump values. The hardened concrete properties are discussed in terms of compressive, splitting tensile, flexure and bond strengths. The obtained results show that, the using of water reducer admixture enhances the main fresh and hardened properties of self-curing high-strength concrete cast using recycled aggregate. Also, using the suggested chemical curing agent increased the strength compared to conventional concrete without curing.

Awareness and Benefits of Self-Curing Concrete in Construction Projects: Builders and Civil Engineers Perceptions

“…Recent studies have investigated the effects of LWAs in determining the properties of self-cured concrete. Towards this end, Yousef [15], Afifi [16], Rahman [17], Bashandy et al [4], and Revalthy and Lakasini [23] incorporated LWAs in cementitious material in determining the effects of the material on the internally cured specimen. These studies revealed a significant reduced autogenous shrinkage and improvement in mechanical properties of the product.…”

“…Previous studies have reported that HPC provides increased strength, higher stiffness, higher durability, reduced creep, economical cost, and effective impact resistance. In achieving the desired quality in HPC, various mineral materials such as fly ash, silica fume, and superplasticizers are added [4]. However, the problem of early age cracking is a major impediment to HPC.…”

Recycled Aggregate Self-Curing Concrete Under Elevated Temperatures

“…In recent years, using waste construction materials become an essential need to reduce their bad impact on the environment. Several researchers suggest using it as coarse aggregates for concrete [22,23,24,25,26,27,28]. Concrete casts using recycled aggregates (RA) as coarse aggregate is less suitable for structural concrete.…”

Performance of High-strength Concrete Made with Recycled Ceramic Aggregates (Research Note)

“…Today, different types of waste materials such as brick [2,3], recycled aggregate concrete [4][5][6][7], PET waste [8] and recycled glass aggregate [9] have been utilized as a substitution for natural aggregate in the concrete production. Besides these, the suitability of waste ceramic aggregates in concrete has been examined by some researchers.…”