Use of metakaolin or coal gangue as a partial substitution of cement in mechanical performance of PC mortars

Arreola-Sanchez, Mauricio; Chávez-García, Hugo Luis; Martínez-Molina, Wilfrido; Alonso-Guzmán, Elia Mercedes; Torres-Acosta, A. A.; Ortega, José María Ponce

doi:10.1080/19648189.2018.1532819

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…All these aspects can produce concrete that is durable and strong. The most important matter from this research the use of MK as a byproduct material can improve the quality of concrete and result in an alternative to the construction world [24].…”

Section: Introductionmentioning

confidence: 99%

Utilisation of Response Surface Methodology (RSM) in Optimizing High-Strength Concrete Containing Microfine MetakaolinBy

Sidek,

Johari,

Yusof

et al. 2024

Preprint

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This paper presents the results of an investigation into the effect of Metakaolin (MK) inclusion on the properties of concrete. Concrete has been used in this research and Metakaolin was used to replace part of the cement at 0, 5, 10, and 15% replacement levels. The replacement was done on a mass-for-mass basis. All concrete samples have been subjected to water curing until the age of testing using compressive strength, porosity, and water absorption. All evaluated data were extended for prediction analysis using response surface methodology. In general, the inclusion of Metakaolin increases strength and reduces the rate of porosity and water absorption on concrete. From the experiment, the inclusion of Metakaolin at 10% replacement gives the optimum result for all testing compared to other samples. Furthermore, a model equation by relating all data was generated and can be adapted for predicting future data. Hence, the inclusion of Metakaolin for normal curing in terms of compressive strength, porosity and water absorption for normal curing shows improvement when compared to the control specimen.

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Section: Introductionmentioning

confidence: 99%

Utilisation of Response Surface Methodology (RSM) in Optimizing High-Strength Concrete Containing Microfine MetakaolinBy

Sidek,

Johari,

Yusof

et al. 2024

Preprint

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“…Extensive studies indicate incorporating an appropriate amount of CCG as a partial replacement of cement can maintain a relatively high long-term mechanical strength [9,10]. This is because as the curing time increased, the amorphous metakaolin with high pozzolanic reactivity in CCG gradually started to react with portlandite (CH) to form additional C-A-S-H gel [11], which resulted in a higher strength growth rate as compared with the pure cement especially from 7 days onwards [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of Curing Temperature on the Performance of Calcined Coal Gangue–Limestone Blended Cements

Zhang,

Zhou,

et al. 2024

Materials

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The utilization of calcined coal gangue (CCG) and limestone for the preparation of blended cement is an efficient approach to address the issue of coal gangue disposal. However, the compressive strength development of blended cement is slow, particularly at high substitution levels of CCG. Therefore, this study aimed to promote the hydration and mechanical properties of the calcined coal gangue–limestone blended cements by increasing the curing temperature. In this study, the samples were cured at two different temperatures, namely 20 and 40 °C. The four groups of samples contained 15 wt.%, 30 wt.%, 45 wt.% and 60 wt.% cement substitutions using CCG and limestone (2:1 mass ratio). The compressive strength, hydration and microstructure were investigated at the ages of 1 to 28 d. X-ray diffraction (XRD) and thermogravimetry (TG) were used to study the hydration behavior of samples. Mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) were used to determine the microstructure of the samples. The results indicate that an increase in curing temperature significantly promotes the compressive strength of the calcined coal gangue–limestone blended cements from 1 to 28 d. The microstructural analysis indicates that increasing the curing temperature not only promotes cement hydration but also facilitates the reaction of CCG, which precipitated more hydrates such as C-A-S-H gel, Hc and Mc. These hydrates are conducive to refining the pore structures and densifying the microstructure, which sufficiently explains the enhanced compressive strength of the calcined coal gangue–limestone blended cements.

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“…at a certain temperature (500ºC~900ºC) [16,17]. Coalbearing metakaolin (CMK) -composed of active silica and alumina -is produced via the calcination of coal kaolin [18,19].…”

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confidence: 99%

Strength Characteristics and Mechanism of CMK Cement Soil in a Na<sub>2</sub>SO<sub>4</sub> Solution Environment

Liu,

Xu,

Xie

et al. 2023

Pol. J. Environ. Stud.

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Cement soil is an artificial mixed material formed by stirring natural soft soil and cement slurry (or powder) via mechanical stirring or jet punching processes [1,2]. It is primarily a mixture of cement and soil [3,4]. Because of its low price, wide material availability, simple construction process, and excellent performance, cement soil is widely used in foundation treatments and roadbed engineering [5,6]. In practical engineering, groundwater is often polluted by acidic and alkaline pollutants, the pH of which can have a significant impact on the strength characteristics of cement soil [7,8]. Additionally, the erosion of cement soil in a sulfate environment is also significant [9,10]. Bai et al. (2007) compared and analyzed the stress-strain curve of cement soil in clear water and a chemical solution environment using indoor simulation experiments and established the relationship between the compressive strength and erosion time [11]. Dong et al. (2011) tested the strength

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Use of metakaolin or coal gangue as a partial substitution of cement in mechanical performance of PC mortars

Cited by 8 publications

References 21 publications

Utilisation of Response Surface Methodology (RSM) in Optimizing High-Strength Concrete Containing Microfine MetakaolinBy

Utilisation of Response Surface Methodology (RSM) in Optimizing High-Strength Concrete Containing Microfine MetakaolinBy

Influence of Curing Temperature on the Performance of Calcined Coal Gangue–Limestone Blended Cements

Strength Characteristics and Mechanism of CMK Cement Soil in a Na<sub>2</sub>SO<sub>4</sub> Solution Environment

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