As an available and high-quality supplementary cementing materials (SCMs), Consumption of Metakaolin (MK) was proposed by many research to replace Portland cement to improve concrete quality and reduce the negative effects of cement industry on the environment. With that being said, it is necessary to summarize the recent finding and gaps on the effect of replacing Portland-cement by MK in different replacement levels on various fresh and hardened properties of concrete . This review paper presents an overview of recent investigations on MK effect on fresh properties, mechanical strength, and corrosion resistance of concrete and mortars. Besides, the synergic effect of MK and other SCMs, its optimum replacement level for different purposes, and application of in different types of concretes are discussed as well. The literature indicates that using MK, up to a certain replacement level, improves the pore structure of concrete; consequently, increases its durability against chloride-induced corrosion. Because of the high aluminum (Al) composition of MK, using MK increases chloride binding as well. In the case of carbonation , using MK was reported to increase the carbonation depth mostly under high CO 2 concentrations. Nevertheless, under the conventional concentration of CO2, MK containing specimens show acceptable performance against carbonation, especially combined to the limestone. From another perspective, MK can play a major role to reduce the direct and indirect CO2 emission of cement industry, and using it seems an inevitable step toward more sustainable cement industry and concrete construction.

Influence of metakaolin on fresh properties, mechanical properties and corrosion resistance of concrete and its sustainability issues: A review

Fractal characteristics of pore structure of hardened cement paste prepared by pressurized compact molding

Pore structure and splitting tensile strength of hybrid Basalt–Polypropylene fiber reinforced concrete subjected to carbonation

Effects of graphene oxide on pore structure and mechanical properties of cementitious composites

A 3D-IFU model for characterising the pore structure of hybrid fibre-reinforced concrete

Properties of concrete are strongly dependent on its pore structure features, porosity being an important one among them. This study deals with developing an understanding of the pore structure-compressive strength relationship in concrete. Several concrete mixtures with different pore structures are proportioned and subjected to static compressive tests. The pore structure features such as porosity, pore size distribution are extracted using mercury intrusion porosimetry technique. A statistical model is developed to relate the compressive strength to relevant pore structure features.

/pdf/relationship-between-pore-structure-and-compressive-strength-563jx5x841.pdf

Z Tian

Papers

Relationship between pore structure and compressive strength of concrete: Experiments and statistical modeling