Mechanism Of Metakaolin In Concrete

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Study on macroscopic mechanical properties and …

The sodium sulfate resistance of recycled concrete (RC) under dry-wet (DW) cycle was studied, and the mesoscopic damage mechanism of RC under uniaxial compression was revealed by using statistical damage theory. The substitution rate of metakaolin (MK) and the number of DW cycles were considered in the test variables.

Effect of Partial Replacement of Cement by Metakaolin on …

Metakaolin is a partial substitute for cement in concrete having a target mean strength of 33.5 MPa (C-25) concrete production with 0%, 10%, 20%, and 30% replacement of metakaolin by weight of cement with 0.49% water-to-cement ratio.

Mechanical strength and the degradation mechanism of metakaolin …

In addition to the pure metakaolin geopolymer system, metakaolin and ordinary Portland cement were mixed to prepare metakaolin-cement geopolymers. The properties of the obtained geopolymers under hydrothermal and non-hydrothermal conditions were compared, and the underlying mechanism was preliminarily discussed.

Improving the sulfate attack resistance of concrete by using

Sulfate attack is a significant durability concern for cement-based materials that threatens many concrete structures. Although this is not a new issue, in the last couple of decades, a myriad of structural members including dams, concrete pavement, bridge piers, concrete piles, buried concrete foundations, highway or railway tunnels, and floor slabs have …

Impact of Metakaolin on the Properties of Concrete: A …

in concrete and errors can arise if the concrete is exposed desorption, Chadbourn [31] found that the total porosity to atmospheric carbon dioxide, either while curing or while of metakaolin pastes was slightly greater than that of pure preparing the sample for analysis. pastes, indicating that metakaolin increases the volume of

Effects of calcium on setting mechanism of …

Geopolymer setting is seen to be substantially accelerated by addition of calcium and the objective of this study was to determine the mechanism for this effect by examining metakaolin geopolymers with and …

The preparation, property and hydration mechanism of ultra …

In recent years, there has been a growing body of research on the use of metakaolin (MK) in Ultra-High Performance Concrete (UHPC) to address the issue of unstable production yields and quality of industrial by-product Silica fume (SF). However, the current scientific literature tends to focus primarily on performance enhancements, often neglecting to …

Impact of metakaolin

is to study the hydration mechanism of SCM's, especially in case of metakaolin. Nowadays the interest is more and more intensive in connection with application of metakaolin. There are promising results with concrete applications made with metakaolin in corrosive * Corresponding author: Tel./ Fax.:+3620/534-4303

Impact of wetting and drying cycles on flexural

In this study, metakaolin was utilized as a substitution of 20% cement to produce wastepaper fiber-reinforced concrete. The wastepaper was derived from discarded plasterboard as a construction and demolition waste. Various concentrations of wastepaper fibers (0–2.5% by weight of the binder) were used to develop a more sustainable concrete with properties …

Influence of metakaolin on the properties of mortar and concrete…

The mechanism by which may suppress expansion due to alkali-silica reaction appeared to. Conclusions. The use of by-products like fly ash, granulated blast furnace slag, silica fume, rice husk ash, and metakaolin in cement and concrete has gained significant importance because of the requirements of environmental protection and sustainable ...

Experimental investigation of metakaolin ingredients on …

The mechanism of concrete deterioration in the simultaneous presence of chloride and sulfate ions is as follows: the reaction between cement hydration products and sulfate ions forms expansive products like ettringite. ... Eco-friendly geopolymer concrete based on metakaolin and ceramics sanitaryware wastes. Ceram. Int., 48 (2022), pp. 34793 ...

Effect of Metakaolin in the Mechanical Properties of Ambient Cured

The experimental investigation is done on the fresh concrete (slump test) and hardened concrete (compressive strength, split tensile strength and flexural strength) of flyash-metakaolin based geopolymer concrete. 5.1 Mix Design. In this study M30 grade conventional concrete was used as control mix.

Utilization of nano-metakaolin in concrete: A review

Nano-metakaolin (NMK) is currently developed and applied in the concrete, and there are a mass of literatures on the properties of concrete with NMK until now. However, a …

Influence of pozzolanic addition on strength and …

The intent of this study is to explore the physical properties and long-term performance of concrete made with metakaolin (MK) as a binder, using microsilica (MS) and nanosilica (NS) as substitutes for a portion of the ordinary Portland cement (OPC) content. The dosage of MS was varied from 5% to 15% for OPC-MK-MS blends, and the dosage of NS was …

Mechanical and durability properties of metakaolin blended …

The fresh concrete grade is selected as the original concrete design grade or higher [8]. Chinese technical specifications for pavements (JTJ0731-2001 [9] and JTGD40-2011 [10]) stipulate that concrete road materials must reach more than 70% of the design strength before traffic can reopen. Therefore, the flexural and bond strengths of the ...

Characterization of net-zero pozzolanic potential of …

Metakaolin consists of the mineral kaolinite with a particle size smaller than cement, it is a valuable admixture for concrete forming a high-performance concrete 19,20.

Mechanical properties and microstructure of red mud-coal metakaolin …

Therefore, to further reveal the mechanism of water content on the performance of GC, specimens with different W/B ratios were selected for microscopic and phase analyses, on the basis of the optimal ratio. ... In this study, the design and optimisation of red mud-coal metakaolin geopolymer concrete was carried out using Taguchi's orthogonal ...

Mechanical and Durability Evaluation of Metakaolin as …

There is a considerable need for promoting the use of cement replacement materials. This study investigates the effect of variable percentages of metakaolin (MK) on the …

Study on mechanical properties and mesoscopic damage mechanism …

DOI: 10.1016/j.dibe.2024.100332 Corpus ID: 267011116; Study on mechanical properties and mesoscopic damage mechanism of metakaolin modified recycled aggregate concrete @article{Bai2024StudyOM, title={Study on mechanical properties and mesoscopic damage mechanism of metakaolin modified recycled aggregate concrete}, author={Wei Feng Bai and …

Analysis of Hydration-Mechanical-Durability Properties of Metakaolin

Metakaolin (MK) is a highly active pozzolanic material and MK is increasingly used in producing high performance concrete. This study presents an integrated hydration-mechanical-durability model for evaluating various properties of metakaolin blended concrete. First, a blended hydration model is proposed for simulating the hydration of composite binders containing MK …

Alkali-silica reaction in concrete: Mechanisms, mitigation and test

Permeability is one of the most important factors governing concrete's durability and is heavily related to water-to-cement ratio (w/c). A low water content meaning low w/c ratio is well ...

Influence of Metakaolin in Concrete Mixture: A Review

Presently the use of metakaolin is gaining lot of importance in partial replacement of cement. It is because metakaolin has increased various strengths of concrete and improved durability. …

Study on multi-scale dynamic mechanical properties of metakaolin

The mechanism of concrete deterioration due to erosion under dynamic strain rate was systematically analyzed by combining macroscopic mechanical property deterioration and meso-structural evolution using statistical damage theory. ... Study on macroscopic mechanical properties and mesoscopic damage mechanism of recycled concrete with metakaolin ...

Geo-polymerization mechanism and factors affecting it …

Geo-polymerization mechanism and factors affecting it in Metakaolin-slag-fly ash blended concrete A D Sandeep Kumar1, Dinesh Singh2, V Srinivasa Reddy3, Kaveli Jagannath Reddy4 1Research Scholar of Civil Engineering, K L University, Andhra Pradesh, India. 2Department of Civil Engineering, K L University, Andhra Pradesh, India 3Professor, Department of Civil …

Mechanism of hydration of the metakaolin–lime–water …

Fly ash and silica fume is used to improve the resistance of concrete to the attack in aggressive environments [2], [3]. Recently, some activated materials such as metakaolin, which is produced by heating kaolinite, have been shown to be an excellent pozzolan. ... To study the mechanism of the metakaolin–lime reaction, measurements of lime ...

Development of a ternary high-temperature resistant …

The geopolymer developed in this study is a promising sustainable, fire-resistant material. The mechanisms of changes in the geopolymer and its concrete up to 1000°C, explained in this study, help optimise their use and improve fire resistance in real-world scenarios. ... Spalling behavior of metakaolin-fly ash based geopolymer concrete under ...

Influence of Metakaolin in Concrete Mixture: A …

Presently the use of metakaolin is gaining lot of importance in partial replacement of cement. It is because metakaolin has increased various strengths of concrete and improved durability....

Impact of metakaolin

Metakaolin is a mineral material of aluminosilicate. The formula of metakaolin in the silicate chemistry is AS 2 (Al 2 O 3.2SiO 2). Grain size of metakaolin is between cement and …

Influence of metakaolin on the properties of mortar and concrete…

The influence of calcium hydroxide content was due to different hydration mechanisms: ... In concrete mixtures, metakaolin replaced either cement or sand in percentages of 10% or 20% by weight of the control cement content. The strength development of metakaolin concrete was evaluated using the efficiency factor (k value).

Influence of Metakaolin in Concrete Mixture: A Review

Since the middle of the 20th century, extensive research work has been carried out on the production and characterization of metakaolin, on the hydration reaction mechanism, as well on the study ...

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