Production of sustainable and structural fiber reinforced recycled aggregate concrete with improved fracture properties: A review

Polypropylene fiber reinforced concrete and its application in creating architectural forms of public spaces

Geopolymers have been recognised as a viable replacement to ordinary Portland cement (OPC), providing a cleaner solution since it can significantly reduce greenhouse gas emissions as well as accomplishing effective waste recycling. Construction and demolition waste (CDW) has been recently identified as raw materials for geopolymers due to its availability and high contents of silica and alumina. This paper aimed at reviewing the current state-of-the-art on the geopolymer paste, mortar, and concrete production and their properties, with special attention paid to geopolymers incorporating CDWs. The review covers brief assessment of using CDWs in concrete, the mix design of geopolymer mixtures in addition to identification of the main factors influencing the performance of geopolymer containing CDW. The most recent data related to the mechanical and durability properties of CDW-based geopolymers are presented, while the cost and environmental impacts of using recycled materials in producing geopolymer concretes are also discussed. Geopolymer concretes have a vast range of possible applications, however, there are still several barriers facing commercialisation of geopolymers in construction industry. The review indicated that it is possible to produce geopolymer concretes from CDW-based materials with properties comparable to OPC-based ones; however, the selection of proper material composition should be carefully considered, especially under normal curing conditions. • Use of construction and demolition wastes (CDWs) in geopolymer materials were assessed. • Factors affecting CDW-based geopolymers were discussed. • Mechanical and durability properties of CDW-based geopolymer materials were evaluated. • Use of CDWs and other wastes in geopolymers were discussed cost- and environmental impact-wise. • Challenges to large-scale adoption of geopolymers were highlighted for future research. 

Properties of geopolymer sourced from construction and demolition waste: A review

Development of high performance concrete

Influence of Barchip fiber on early-age autogenous shrinkage of high strength concrete

Properties of high strength polypropylene fiber concrete containing recycled aggregate

Evaluation of high-strength concrete made with recycled aggregate under effect of well water

In recent years, the use of self-compacting concrete in structures has increased significantly around the world Many studies have been carried out on the characteristics of this type of concrete with the urgent need to design concrete mix and to find the material ratios used in this type of concrete so far there are no standard mix design self-compacting concrete methods, but there are many types of research to design mixes. Hence the need to review and compare these methods is of considered interest. The review of these studies helps researchers to choose the appropriate method of designing the mixtures of self-compacting concrete and their requirements, whether the strength or workability

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A Review on Mix Design of Self-Compacting Concrete

The effect of using different water resources and cement types on concrete strengths at late ages is investigated. Two types of cement including Ordinary Portland Cement (OPC) and Sulfate Resisting Portland Cement (SRPC) were employed to prepare concrete mixes with potable and well water. Compressive, flexural, and tensile tests on were conducted at 28, 90 and 180 days. Results show that the maximum decreasing of concrete strength was about 42.9% at 180 days compared with the control mix when using well water with OPC. This was due to the chemical contents of well water that are more than the allowed limits. While the reduction in compressive strength was about 31.3% when using well water with SRPC due to sulfate resisting cement. Flexural strength reductions of 50.5% and 42.8% was seen when using OPC and SRPC respectively with well water at 180 days. Same effect was observed for tensile strengths which indicates that using well water has negative effect on concrete strengths at late ages. Modulus of elasticity was calculated using the ACI 318 equation. Higher reduction of 24.5% was seen when using OPC with well water than 17.2% when using SRPC with well water at 180 days compared to control mix.

Tuqa Waleed Ahmed

Papers

Properties of high strength polypropylene fiber concrete containing recycled aggregate

Evaluation of high-strength concrete made with recycled aggregate under effect of well water

A Review on Mix Design of Self-Compacting Concrete

Effect of well water on the mechanical properties of concrete with using two types of cement