Systematic investigation of filtrates and filter residues resulting from a 24 h treatment of metakaolin in different alkaline solutions were performed. On filtered metakaolin particles, inductively coupled plasma-optical emission spectrometry (ICP-OES) measurements reveal an enrichment of iron and titanium, which suggests an …

Le CO2 émis provient donc exclusivement de la combustion du gaz nécessaire à la calcination flash, la société Argeco faisant état de l'émission de 103 kg/tonne de métakaolin produit [ARG]. De plus, du point de vue de la consommation de matières premières, le métakaolin est également avantageux car d'après ce même rapport, l ...

Fig. 2 shows the influence of the four mix design parameters on compressive strengths of 7-day-old metakaolin-based geopolymers synthesized in the current study. As can be seen in Fig. 2 (a), a clear trend shows that compressive strength increases with increasing Si/Al ratio first, peaks at Si/Al ratio close to 2, and decreases with increasing …

Due to the increasing prices of cement and its harmful effect on the environment, the use of cement has become highly unsustainable in concrete. 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 mechanical …

The importance and uniqueness of this study are (1) Conducting experimental work on high-performance concrete (M60) partially replaced with metakaolin. (2) The Application of machine learning techniques to develop a metakaolin-based concrete model. The primary attention of this study is a machine learning-based …

Compressive strength prediction of metakaolin based high-performance concrete with machine learning - ScienceDirect Abstract Introduction Section snippets …

2.1.1. Metakonlin (MK) The raw material used in this research was highly reactive metakaolin produced by Gongyi Jin'ao Resistance Material Co., Ltd. (Gongyi, China, with a fineness of 1250 mesh (Figure 1 a).The chemical composition and mass fraction were determined using X-ray fluorescence spectroscopy analysis and the …

Minerals 2022, 12, 330 3 of 17 Table 1. The physical index and chemical composition of OPC and metakaolin. Physical Index Chemical Composition (wt %) Chemicals (wt %) Specific Surface Area

RF and FA hybrid machine learning algorithms were used to predict the compressive strength of metakaolin cement-based materials, and the training set and test set between predicted values and measured values had a high consistency (RMSE of the training and testing datasets are 11.143 and 11.6643, respectively; R of the training and …

Replacing metakaolin by fly ash has been investigated in some publications [41,43,44,45], where mostly metakaolin with a very high fineness was used, which resulted in very high initial l/s ratios. The low l/s ratio of 0.4, as applied by Duan et al. [ 43 ], could only be realized at very high fly ash contents (> 80%).

Regarding the use of metakaolin, the respective MK/B variable ranges from 0 which means no metakaolin is used in the mix, up to 50% of the total binder weight. The age of the specimens, also includes 1-day specimens up to 180-day ones, with the average age being 34, slightly over the typical for concrete strength verification, 28-day age.

This work evaluates the significance of the four common mix design parameters, namely Si/Al (molar ratio), water/solids (mass ratio), Al/Na (molar ratio) and H2 O/Na 2O (molar ratio), in determining compressive strength of metakaolin-based geopolymers through experiments and statistical analyses. In addition, machine learning …

Slag cement usually decreases water demand between 1% and 10%, depending on dosage. Like fly ash, slag cement will generally enhance the workability of concrete. However, its effect on the required dosage rate of air-entraining admixtures is variable. The impact of slag cement on bleed rates will depend on its fineness.

In the present work, the cement is partially replaced with metakaolin in high-performance concrete, while the tool of machine learning application has also been utilized. The present work focuses on developing ML-based models to assess the characteristic compressive strength of metakaolin-based high-performance concrete (M60) based on …

Although machine learning models have been employed for the compressive strength (CS) of cement-based mortar containing metakaolin, it is difficult to understand how they work due to "black-box" nature.In order to explain the involved mechanism, Categorical Gradient Boosting (CatBoost) model with feature importance, feature …

Abstract. Metakaolin (MK), commercially available since the mid-1990s, is one of the recently developed supplementary cementing materials (SCM) that conforms to …

PDF | On Jul 19, 2022, Ali Al-Saraireh Majd published Predicting compressive strength of concrete with fly ash, metakaolin and silica fume by using machine learning techniques | Find, read and ...

Metakaolin (Al 2 O 3 ·2SiO 2 ·2H 2 O) is a typical clay material with the main components of SiO 2 and Al 2 O 3; Al 2 O 3 content is 40% and more, which is higher than other clay minerals [27,28,29,30]. Commercial metakaolin is produced by kaolinite calcination at a temperature of 600~800 °C [28,30,31]. The crystalline kaolinite is mainly …

The main aim of this investigation is to develop backfill concrete including coal gangue and metakaolin to reduce solid waste. For this purpose, a total of 30 concrete mixtures were designed by the inclusion of 0%, 25%, 50%, 75% and coal gangue as coarse aggregates and 0%, 10% and 20% metakaolin as binder at 0.55 and 0.45 water to …

Eau/Liant (E/L) constant en faisant varier la teneur en mé-takaolin. ... Metakaolin concretes with a range of MK contents (0–30%) have been cured for periods of 1 to 90 days. The change in ...

Metakaolin is a component extensively employed in recent decades as a means to reduce the requirement for cement in concrete. For the proposed models, six …

Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the liquid/solid ratio of paste and, amongst others, the Si/Al ratio of the formed geopolymer network. In this study, fly ash blended metakaolin based …

Metakaolin (MK) is a pozzolanic material. It is obtained by the calcination of kaolinitic clay at a temperature ranging between 500 °C and 800 °C. The raw material input in the manufacture of metakaolin (Al 2 Si 2 O 7) is kaolin. Metakaolin on reaction with Ca (OH) 2, produces CSH gel at ambient temperature and reacts with CH to produce ...

An environmental assessment of metakaolin as a supplementary cementitious material (SCM) through an integrated production-process-simulation and …

The global metakaolin market was valued at US$ 756.87 million in 2020 and is projected to reach US$ 1,100.83 million by 2028; it is expected to grow at a CAGR of 4.8% from 2020 to 2028. Metakaolin ...

Alaa M. Rashad Add to Mendeley https://doi/10.1016/j.conbuildmat.2012.12.001 Get rights and content Abstract Kaolin …

Volume 322, 7 March 2022, 126500 Revealing the nature of metakaolin-based concrete materials using artificial intelligence techniques Panagiotis G. Asteris a, Paulo B. …

Procédés d'activation des sols argileux Rojo Amandine1, Phelipot-Mardelé Annabelle1, Lanos Christophe1, Molez Laurent2 1 UEB - LGCGM, Equipe Matériaux Thermo-Rhéologie, IUT Rennes [email protected] 2 UEB - LGCGM, Equipe Matériaux Thermo-Rhéologie, INSA Rennes [email protected] RÉSUMÉ.L'utilisation de …

Materials with Metakaolin Based on the Hybrid Machine. Learning Method. Jiandong Huang 1,2, Mengmeng Zhou 1, Hongwei Yuan 1, *, Mohanad Muayad Sabri Sabri 2 and Xiang Li 1.

Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the …

metakaolin has little effect on the tensile and compressive elastic modulus. Astutiningsih et al. studied the influence of Metakaolin Metastar and Metakaolin Bangka on the strength of ordinary cement [24]. Four metakaolin levels of 5%, 10%, 15%, and 20% were used in this investigation. The results show that both metakaolins can enhance the ...

3.2. Morphology. In scenarios where concrete structures undergo severe loss of compressive strength and durability, for example, in coastal and marine environments, metakaolin proves useful in modifying the fresh and hardened state properties, while also improving the performance of concrete [].The performance of MK as supplementary …

The samples without metakaolin have a higher autogenous shrinkage among other samples with different metakaolin contents, indicating that the inclusion of metakaolin in alkali-activated slag contributes to mitigating autogenous shrinkage of alkali-activated slag, which is consistent with the results reported by Li et al. [6,17]. In addition ...

Dans le cas de la méthode par voie sèche, le mélange granulats-ciment est introduit sec en machine, l'eau est ajoutée à la fin du transfert. Cette technique, très employée, est néanmoins ...

In this paper, the dolomitic limestone determined as alkali–carbonate-reactive by various methods is used as an aggregate. Inhibition experiments were carried out on the basis of the concrete microbar method (RILEM AAR-5 standard), in which 10%, 30%, and 50% fly ash and metakaolin were used to replace cement. …

Hung et al. synthesized a metakaolin-based geopolymer mixture of 70% metakaolin and 30% blast furnace slag powders activated with alkaline activating solutions. The coefficients of thermal conductivity of the specimens so produced using a mechanical ing process were lower than 0.1 W/m°K when its relative density is reduced to …