Effect of metakaolin as partially cement replacement on the compressive strength of standard mortars

Fezzioui, Naima; Amrane, Belaid; Souici, Khaled; Hami, Brahim; Kennouche, Salim; Safi, Brahim; Mesrati, N.

doi:10.37789/rjce.2021.12.2.6

Cited by 4 publications

(3 citation statements)

References 7 publications

(10 reference statements)

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“…Hence, the use of supplementary cementitious materials commonly reached by SiO 2 , Al 2 O 3 , and Fe 2 O 3 are mostly recommended to be added in concrete for minimizing cement content, to achieve good concrete properties, cost reduction, and reduce environmental pollution coming due to ordinary Portland cement production [3]. Supplementary cementitious materials in concrete mixtures contribute a lot of significance to the fresh and hardened properties of concrete like enhancing workability, reducing the heat of hydration, lowering permeability, improving ultimate strength, and durability [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Hence, construction industries are potentially using one or another supplementary cementitious material commonly identified as pozzolana [8,20].…”

Section: Introductionmentioning

confidence: 99%

“…That is through using as a partial substitution of cement by NP to reduce cement consumption and at the same time improve concrete performance [30][31][32][33][34][35][36][37][38]. Besides these, the employment of NP is beneficial in the reduction of deformations while improving the compressive strength of concrete [14,30,35,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]. Also, NP can improve concrete resistance to chloride ion penetration which is directly indicated by electric resistivity and durability of concrete by reducing shrinkage cracks and significantly reducing crack width of concrete matrices [1,12,[54][55][56].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Natural Pozzolana on Physical and Mechanical Properties of Concrete

Fode,

Jande,

Kivevele

2024

Advances in Civil Engineering

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Construction industries are rapidly growing, sacking high amounts of concrete which has a highly dense microstructure with excellent mechanical properties, more durable, and highly eco-friendly materials. Hence, many of the researchers are interested in solving this problem with replacing concrete by natural pozzolana (NP) which is a supplementary cementitious material mostly from volcanic sources having much active silica content that can improve the durability and mechanical properties of concrete. However, it is not well-known which common optimum replacement range can give the most desirable concrete properties. So, the present study sought to review the effects of replacing NP from volcanic sources on the durability, physical, mechanical, and microstructural properties of concrete, also, to identify the most common dose of a positive effect as a replacement in concrete. The review shows that many of NP used by different literature from different places satisfy ASTM replacement standard in concrete, especially, based on its chemical compositions. Also, the review observed that employing NP in concrete significantly improves concrete workability, lengthens setting time, and reduces bulk density, porosity, water absorption, and chloride ion migration by making denser concrete microstructure. In general, adding 5%–20% of NP in concrete significantly improves compressive strength, split tensile strength, and flexural strength. Specifically, most of the studies found 15% replacement of NP having volcanic sources can give optimum strength. Besides these, most of the studies indicated that the improvement of the strength was more visible at the concrete age of 7–28 days.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Natural Pozzolana on Physical and Mechanical Properties of Concrete

Fode,

Jande,

Kivevele

2024

Advances in Civil Engineering

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“…Several types of researches dealt with the impact of using MK on concrete; most of these researches highlight that the optimum replacement ratio of cement with MK is 15% [23][24][25][26][27][28][29][30][31], Above this ratio the strength starts to decline. This research investigated the possibility of using high proportions of MK up to 30% to achieve the optimal saving of cement in concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of Metakaolin Activation and Alccofine on the Mechanical Strength of Concrete at Elevated Temperature

Aziz

2023

Journal of Al-Azhar University Engineering Sector

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This research examines the possibility of chemically activating MK (Metakaolin) to increase the MK ratio with strength improvement at both standard and elevated temperatures. Besides, cement was replaced by AF (Alccofine) with a ratio of up to 15 % to improve concrete workability and strength. MK was tested with ratios ranging from 0% to 30%, with a 5% increase. MK was activated chemically using two activators: 2.5% Na2SO4 and 4% Aquis Na2SiO3. AF was investigated at 5%, 10%, and 15% ratios. 0.7% glass fibres (GF) were added to improve concrete ductility. According to the results of the tests, MK. up to a ratio of 15% without an activator improved concrete strength. After 28 days, the increase in strength was more pronounced. After the 15% ratio, the concrete strength improvement was rapidly declined. The Aquis Na2SiO3 activator increased the strength of the concrete while diminishing its workability. AF improved workability and concrete strength when subjected to normal and after being exposed to elevated temperatures. Using GF at a weight ratio of 0.7% on activated 30% MK with Aquis Na2SiO3 and 10% AF improved splitting and flexural strength at normal and increased temperatures Furthermore, GF avoided the spalling of concrete samples induced by the application of AF. Correlations between different mechanical parameters of concrete using multiple regression analysis. A good agreement between the predicted equations' outputs and the experimental results for compressive, splitting, and flexural strengths. Further, a cost analysis was conducted for the suggested mix by comparing it with a high-strength concrete mix of the same grade, and workability.

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