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Properties Of Concrete

Recent progress in low-carbon binders

There is a burgeoning interest in the development of geopolymers as sustainable construction materials and incombustible inorganic polymers. However, geopolymers show quasi-brittle behavior. To overcome this weakness, hundreds of research have been focused on development, characterization, and implementation of fiber-reinforced geopolymers for a wide range of applications. This paper discusses the rapidly developing state-of-the-art of fiber-reinforced geopolymer composites, focusing on material and geometrical properties of construction fibers, and underlying mechanisms on fiber-binder interaction at fresh and hardened states, mechanical properties, toughening mechanisms, thermal characteristics, and environmental durability. It is intended to build a strong conceptual and technical background for what is currently understood on fiber-reinforced geopolymers by tying the subject together with knowns for other similar cementitious composites rather than a historical report of literature.

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Fiber-reinforced geopolymer composites: A review

Green concrete: Prospects and challenges

Microencapsulated phase change materials for enhancing the thermal performance of Portland cement concrete and geopolymer concrete for passive building applications

“Fly ash and GGBFS based powder-activated geopolymer binders: A viable sustainable alternative of portland cement in concrete industry”

Geopolymer is a noble material, made from reaction between aluminosilicate compounds and alkali solution which owns a good binding property. In last decades, lots of research and development works have been carried out globally to investigate the engineering, thermal, micro-structural and durability properties of geopolymer concrete as a sustainable alternative to Portland cement. Results from previous works indicated that geopolymer concrete exhibited better mechanical strength and durability properties than ordinary Portland cement (OPC) concrete. Nowadays, high-strength concrete is increasingly used in major civil construction works, such as high-rise buildings and bridges because of its structural and economic benefits over normal-strength concrete. This paper reports the experimental results on engineering properties of high-strength geopolymer concretes of 65 and 80 MPa using geopolymer binders at ambient curing conditions. High-strength concrete produced in this study was able to set quickly in ambient conditions therefore can attain sufficient strength at early days as well as exhibited higher tensile and flexural strength than concrete from OPC. High-strength geopolymer concrete can be produced with very simple mix design; however, it has some limitation for commercial applications. This paper discusses about the advantages and limitations of geopolymer high-strength concrete for its application in concrete industry.

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High-Strength Geopolymer Concrete- Properties, Advantages and Challenges

Geopolymer is an inorganic polymer binding material, generally formed by the reaction between aluminosilicate materials and alkali activator solution. Previous researches on geopolymer concrete around the world suggested that geopolymer concrete possess superior mechanical and durability properties over ordinary Portland cement (OPC) concrete, such as higher indirect tensile strength and resistance to sulphate attack. Generally, fly ash-based geopolymer concrete was cured in elevated temperature for higher early age strength because of their longer setting time in ambient temperature. Published engineering properties of geopolymer concrete cured at ambient temperature are not abundant. In this research, two types of powder-activated geopolymer binders were used as binding material. A detailed study of compressive strength and drying shrinkage of different grades (40, 50, 65 and 80 MPa) of geopolymer and OPC concrete with different workability levels (normal-workable and super-workable) were carrie...

Kamal Neupane

Papers

“Fly ash and GGBFS based powder-activated geopolymer binders: A viable sustainable alternative of portland cement in concrete industry”

High-Strength Geopolymer Concrete- Properties, Advantages and Challenges

Investigation on compressive strength development and drying shrinkage of ambient cured powder-activated geopolymer concretes

Effect of curing on the compressive strength development in structural grades of geocement concrete

Mechanical Properties of Geopolymer Concrete: Applicability of Relationships Defined by AS 3600