The safe disposal of an enormous amount of waste glass (WG) in several countries has become a severe environmental issue. In contrast, concrete production consumes a large amount of natural resources and contributes to environmental greenhouse gas emissions. It is widely known that many kinds of waste may be utilized rather than raw materials in the field of construction materials. However, for the wide use of waste in building construction, it is necessary to ensure that the characteristics of the resulting building materials are appropriate. Recycled glass waste is one of the most attractive waste materials that can be used to create sustainable concrete compounds. Therefore, researchers focus on the production of concrete and cement mortar by utilizing waste glass as an aggregate or as a pozzolanic material. In this article, the literature discussing the use of recycled glass waste in concrete as a partial or complete replacement for aggregates has been reviewed by focusing on the effect of recycled glass waste on the fresh and mechanical properties of concrete.

Geopolymer (GP) concrete is a novel construction material that can be used in place of traditional Portland cement (PC) concrete to reduce greenhouse gas emissions and effectively manage industrial waste. Fly ash (FA) has long been utilized as a key constituent in GPs, and GP technology provides an environmentally benign alternative to FA utilization. As a result, a thorough examination of GP concrete manufactured using FA as a precursor (FA-GP concrete) and employed as a replacement for conventional concrete has become crucial. According to the findings of current investigations, FA-GP concrete has equal or superior mechanical and physical characteristics compared to PC concrete. This article reviews the clean production, mix design, compressive strength (CS), and microstructure (Ms) analyses of the FA-GP concrete to collect and publish the most recent information and data on FA-GP concrete. In addition, this paper shall attempt to develop a comprehensive database based on the previous research study that expounds on the impact of substantial aspects such as physio-chemical characteristics of precursors, mixes, curing, additives, and chemical activation on the CS of FA-GP concrete. The purpose of this work is to give viewers a greater knowledge of the consequences and uses of using FA as a precursor to making effective GP concrete.

Lightweight foamed concrete has recently been adopted as a more sustainable construction material due to various features such as reduction in member size, better thermal insulation, and cost savings. This work examines an attempt to improve the brittle nature of foam concrete with the addition of different types of fibres. Five types of fibres were used: steel fibres (hooked-ends), micro steel fibres (straight ends), carbon, glass, and polypropylene fibres. The effect of fibre type on the fresh (density and flowability) and hardened (compressive strength, splitting tensile strength, flexural strength, and static modulus of elasticity) properties of lightweight foamed concrete were thus investigated. The results collected from the experimental work revealed that steel fibres significantly improve the performance of lightweight foamed concrete in terms most properties while other types of fibres (carbon, glass and polypropylene fibres) improved properties at different levels to the steel fibres. Using 0.45 hooked-ends steel fibres gave the most significant improvement in splitting, flexural strength, modulus of elasticity and compressive strength at 162.5%, 83.78%, 72.41%, and 63.63%, respectively.

Nowadays, lightweight concrete become popular among construction companies due to its physical characteristic such as sound and thermal insulation, lightweight, cost and environmental saving, self-levelling…etc., which make it an attractive choice as a building material. However, this concrete face many constructional obstacles due to the lack of adequate and sufficient constructional information about the nature of this concrete. This requires great caution when use it for structural purposes. Among these great constraints, for example, is the weak characteristic of the bond between this concrete and reinforcing steel. Therefore, in order to get rid of these defects of concrete and make it usable in various construction sectors, this paper summarizes researchers works concerning bond behavior between light weight concrete and reinforcing bars , the variable influencing bond behavior such as; concrete type, rebar type and diameter, W/C ratio, and adding fibres. And results collected from experimental work with most important conclusions

Foamed concrete is known for its weak strength due to the high porosity caused by air bubbles. The focus of this research was on studying the most important structural feature, which is the compressive strength at 7 &28 days of reinforced foamed concrete with different types of single fibres, such as hooked-ends steel fibres, corrugated steel fibres and polypropylene fibres. in addition to, foamed concrete reinforced with hybrid fibres (using the combination of polypropylene with hooked-ends Steel Fibres) and (combination of polypropylene with corrugated fibres), The best results were obtained basically using hybrid fibres of 0.4% hooked-ends steel fibres with0.3Kg/m3 polypropylene fibre followed by using 0.4% corrugated steel fibres with 0.3Kg/m3 polypropylene fibre.