A Review on the Effect of Mechanical Properties and Durability of Concrete with Construction and Demolition Waste (CDW) and Fly Ash in the Production of New Cement Concrete

Abstract

The search for new alternative materials for employment in the construction industry is necessary for more sustainable development. The construction demolition waste (CDW), as well as by-products generated by initiatives, such as slag, fly ash (FA), palm oil fuel ash (POFA), metakaolin (MK), silica fume (SF), and rice husk ash (RHA), are objects of studies in several segments of the civil construction sector. The addition of these wastes to the materials currently used to produce concrete and mortar can be one of the significant efforts to achieve more sustainable construction. The use of these wastes in the construction sector can bring considerable benefits in terms of costs, energy efficiency, and environmental and ecological benefits. Over the years, many types of research have been developed aiming at the possibility of a practical use of CDW as an aggregate and industrial by-product (FA, POFA, MK, SF, RHA) as pozzolans. Based on recent studies, this paper reviews the current state of knowledge about the production of concrete with partial replacement of natural aggregates by recycled aggregates from CDW and the use of fly ash (FA) as pozzolan in partial replacement with Portland cement. This work discussed the following concrete properties: compressive strength, water absorption, chloride penetration, carbonation, and modulus of elasticity.

The Influence of Fly Ash Contents on Mechanical Properties and Energy Response of Concrete at a High Strain Rate

“…If fy ash was discarded directly into the natural environment, it would cause signifcant pollution to the environment. However, fy ash as a concrete preparation material could change the performance of traditional concrete [4,5] on the one hand, and it could also reduce the manufacturing cost of concrete and reduce environmental pollution [6][7][8] on the other hand. Terefore, it was of great engineering signifcance to study the mechanical properties and energy response characteristics of fy ash concrete under the high strain rate for the application of fy ash concrete in the environment with rock burst.…”

Setting behavior and mechanical properties of geopolymers from fly ash and real construction waste

“…Generally, these wastes have been processed into fine and coarse aggregates. These can be used in mortar and concrete mixes as partial or complete substitutes for natural aggregates, 20,21 and can also be used in geotechnical applications such as slope stabilization, shallow and deep foundations, and granular and base courses 22 . Nevertheless, a large proportion of inorganic demolition materials are still sent to construction waste landfills, where they block valuable landfill space 23 .…”

Technical-Economic Opportunities of Mixture Optimization and Recycled Aptitude at a Pre-Casting Concrete Plant

“…Moreover, since the current standards on structural concrete include the reuse of old concrete from CDW, this action is highly indicated for economic and environmental savings, as well as reducing of CDW volume. In fact, the sustainable management of resources is directly related to new perspectives of construction, with the application of the life cycle assessment (LCA) methodology [29][30][31][32], in which the reduction of the environmental impact of buildings is enhanced by renewable or recycled materials with low industrial processing [33][34][35][36], with these policies for cost reintegration being considered a key question in new building development.…”