Properties of the alkali activated slag cement with a modifying additive—metakaolin—added in a quantity of 10 % by mass are reported and discussed. ... O., Kavalerova, E. (2015). Role of Metakaolin on Lowering pH of the Alkali Activated Cement Concrete in Barrier Application. In: Scrivener, K., Favier, A. (eds) Calcined …
1. Introduction1.1. Background. Cement concrete is a widely used construction material nowadays, whose production will reach 5.5 billion tons per year by 2050 based on the latest reports [1].During the production process of traditional cement concrete, ordinary Portland cement is adopted as the binder material.
This work researched into the use of metakaolin as a partial substitute for cement in concrete, metakaolin was obtained by the calcination of kaolin clay to about 700 0C Cement was replaced with ...
DOI: 10.1016/J.CEMCONCOMP.2021.103999 Corpus ID: 233567290; The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach @article{Cai2021TheRO, title={The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach}, …
This experimental study aims to investigate the engineering properties of metakaolin (MK) based concrete exposed to chloride attack. The investigation was conducted for different w/b ratios of 0.54–0.61. The MK, utilised as cementitious material, was varied from 0 to 20% with an increment of 5% and ages of concrete from 7 to 56 …
Metakaolin (MK) is an effective cementing material to improve the workability of concrete and reduce the usage of cement (Siddique and Klaus, …
1. Introduction. High-reactivity metakaolin 1 () is a mineral admixture, which is relatively new to the concrete industry that has the potential for improving the durability of concrete. differs from the more commonly used mineral admixtures, such as fly ash and silica fume, in that it is not a by-product; it is manufactured under a …
Huseien et al. [] found a deceleration of the initial and final setting time of AAS mortar mixtures activated with NaOH and sodium silicate solution by partially replacing slag with 5–15% MK.The incorporation of 5%, 10% and 15% MK decelerated the initial setting time by ~169%, ~236% and ~284%, respectively, whilst the final setting time was …
Metakaolin was added to the mixture of high performance concrete in the range from 0 to 25% weight of cement. The comparison of metakaolin and microsilica, which is often used by concrete ...
Metakaolin has been shown to play a significant role in the pore structure evolution of cementitious materials due to its high pozzolanic reactivity and small fineness.
observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments. Keywords: Metakaolin; Concrete penetrability; Alkali‐Silica Reaction; Carbonation Introduction Metakaolin, also referred to as highly reactive calcined clay, is
DOI: 10.1016/J.CEMCONRES.2017.02.003 Corpus ID: 99533858; Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends @article{Shi2017RoleOC, title={Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends}, author={Zhenguo Shi and Mette Rica Geiker …
Title: Metakaolin in Concrete: The Role of Alumina Author(s): Michael Thomas Publication: Web Session Volume: Issue: Appears on pages(s): Keywords: DOI: Date: 10/17/2021 Abstract: Data are presented from a number of studies on the durability of mortar and concrete containing metakaolin (MK), a calcined high-purity kaolin clay …
Recent studies have demonstrated that in the presence of limestone (CaCO3), carbonate-AFm phases (i.e., hemi- and/or mono-carboaluminate) may be stabilized at the expense of sulfate-AFm, which is more commonly found in cement systems. This suggests that enhancing AFm phase formation may be a novel way of incorporating increased …
The role of Zn, a known retardant used in Portland cement, in geopolymer systems is not well understood. ... (2020) The role of zinc in metakaolin-based geopolymers. Cement and Concrete Research, 136. 106194. ISSN 0008-8846 Abstract. Geopolymers are low-calcium, sustainable cementitious materials. The role of Zn, a known retardant used in ...
The suggested mechanism for colloidal stability and fluidity of metakaolin-based cements (e.g. Portland cement blends and alkali-activated cements) is explained by changes in the distribution and ...
DOI: 10.1016/j.jclepro.2024.142382 Corpus ID: 269476274; Utilization of carbonated alkaline solid wastes in ordinary Portland cement-metakaolin-limestone ternary mixture: underlying the role of low grade-sustainable calcium carbonate sources
Metakaolin is a quality enhancing pozzolan for concrete. In this review paper the work done by various researchers on the effect of the addition of metakaolin to …
The detailed characterization of carbonated alkaline solid wastes and the performance of metakaolin-cement based ternary systems were evaluated. The reaction mechanism of carbonated alkaline wastes in metakaokin-cement based binder is proposed. The results indicated carbonated alkaline solid waste powder containing relatively low calcite (14.4% ...
However, with the ongoing hydration process of cement-metakaolin blended mixture, the compressive strength of cement mortar with the rise of metakaolin became obvious higher in relative to the reference cement mortar without metakaolin at the age of 3 d. ... The role of particle size on the performance of pumice as a supplementary …
Long term durability properties of concrete modified with metakaolin and polymer admixture. Construction and Building Materials, Volume 172, 2018, pp. 41-51 ... Adel Al Menhosh, …, Levingshan Augusthus-Nelson. The role of metakaolin in pore structure evolution of Portland cement pastes revealed by an impedance approach. …
Although high temperatures damage the mechanical and durability characteristics of normal concrete, the substitution of 15% of cement weight with …
Based on the results obtained, the optimum proportion of metakaolin replacement in cement sand bricks making is 15% by virtue of its having the lowest thermal conductivity value of 0.580 W/mK and ...
1. Introduction. Manufacturing of Portland cement is a major source of global carbon dioxide (CO 2) emissions, making up approximately 5%–7% of global CO 2 emissions from industrial and energy sources [1].Geopolymer can be considered as an alternative material to Portland cement [2] owing to its benefits in terms of energy …
There is a considerable need for promoting the use of cement replacement materials. This study investigates the effect of variable percentages of metakaolin (MK) …
Metakaolin on reaction with Ca(OH) 2, produces CSH gel at ambient temperature and reacts with CH to produce alumina-containing phases, including C 413, C 2 ASH 8, and C 36 (g et al., 1995, Zhang and Malhotra, 1995). Metakaolin had 99.9% particles < 16 µm with a mean particle size of about 3 µm (Table …
Influence of Metakaolin in Concrete as Partial Replacement of Cement, International ... In the today's world concrete plays an important role in the construction works like dams, buildings ...
It was shown that concrete containing metakaolin produced higher strengths and improved durability when compared to the control (Figure 7). The …
metakaolin in concrete positively influences durability properties such as penetrability (water absorption, gas permeability and chloride ingress), and helps mitigate ASR.
Metakaolin is a supplementary cementitious material that conforms to ASTM C 618, Class N pozzolan specifications 1. Sinngu et al. 1 evaluated South African metakaolin as a cement extender. In ...
1. Introduction. Cement significantly contributes to CO 2 emissions due to high energy consumption during its production [1], [2].The direct CO 2 emissions intensity increased from 0.54 tCO 2 to 0.59 tCO 2 per ton cement production between 2015 and 2021 [3].CO 2 emissions could be reduced by using alternative green materials and …
Learn about highly reactive metakaolin, a pozzolanic material produced from calcined kaolin clay, and its effects on fresh and hardened …
On the other hand, the microstructure of metakaolin is the irregular sheet structure which is completely different from fly ash, in other words, the morphological effect generated by the spherical beads of fly ash can not occur in metakaolin blended cement composites [30], [31]. Download: Download high-res image (99KB)
In this study, the effect of curing humidity on mechanical performance, hydration as well as microstructure for cement paste containing metakaolin (MK) and limestone powder (LP) with various water to binder (w / b) ratios, such as 0.24, 0.36, and 0.48, were investigated.A total of 18 types of slurries were prepared and cured under …
This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of 0.3. MK mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was …
Geopolymers are low-calcium, sustainable cementitious materials.The role of Zn, a known retardant used in Portland cement, in geopolymer systems is not well understood.This study scrutinises the effect of Zn on metakaolin-based geopolymer reaction mechanisms and kinetics, and investigates the incorporation mechanism of Zn …
Metakaolin is an anhydrous aluminosilicate obtained by the thermal decomposition of kaolin, a naturally occurring clay. It is used as a pozzolanic additive in cement and …
The utilisation of calcined clay in the form of metakaolin as a pozzolan for concrete has received considerable interest in recent years. The use of metakaolin as a mineral admixture for concrete is a well-documented practice. Metakaolin is a quality enhancing pozzolan for concrete. In this review paper the work done by various …