Effects of metakaolin and treated rice husk ash on the compressive strength of concrete

Abdulwahab, R.; Odeyemi, Samson Olalekan; Alao, Habeeb Temitope; Salaudeen, Toyyib Adeyinka

doi:10.17515/resm2020.223ma1014

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…The water absorption (WA) of test specimens was done on the basis of ASTM C642-13 [23]. Calculations were done using formula (2), where Mh was the weight in grams of the specimen after immersion in water for 48 hours and Ms its weight after drying the specimen at 105°C for 48 hours.…”

Section: Tests On Fresh Paste and Hardened Mortarmentioning

confidence: 99%

“…The increasing in population, infrastructure and economic activities, particularly in developing countries, leads to a growing demand for building materials, among which the most used is concrete, with cement as its main constituent [1]. Portland cement production in the world is around 1.2 billion tons per year [2]. Each ton of ordinary Portland cement is known to produce a similar amount of carbon dioxide in the atmosphere, a major greenhouse gas implicated in global warming, which makes the cement industry responsible for about 7% of global carbon dioxide emissions [3] Additionally, cement undergoes hydration in the form of calcium silicate hydrate.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Bayiha¹,

Bahel²,

Kenmogné³

et al. 2023

Global J. Eng. Technol. Adv.

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The comparative study of some effects of natural and artificial pozzolans on the hydraulic properties of Portland cement mortar is performed in this work. The natural pozzolan used coming from the Djoungo deposit, Moungo department in the Littoral region (Cameroon) was finely ground and then sieved at 100 μm. The artificial pozzolan used is the alluvial clay of Etoa collected from Yaoundé III District in Mfoundi Division of the Centre Region of Cameroon. It was thermally activated at 700°C after grinding and sieving. The chemical and mineralogical analysis of the raw materials were studied by X-ray fluorescence, infrared spectrometry (FTIR) and X-ray diffraction (XRD) then the specific surfaces and the absolute densities were determined. The formulation of the pastes and mortar was obtained by substituting Portland cement with different pozzolans at different percentages, while the initial and final setting time of the fresh pastes were determined. Linear shrinkage, water absorption, apparent density, flexural strength and compressive strength tests at 7 and 28 days were determined on the hardened mortars. The results obtained show an increasing in the initial and final setting time with the addition of the amount of pozzolan (natural or artificial), the pozzolans played the role of setting retarder in the mixtures, finer particles of the artificial pozzolan speed up the setting time of pastes as compared to that with natural pozzolan. The shrinkage of the hardened mortars increased with the addition of the pozzolans, but it was less than 0.2% in all the samples, the specimens with artificial pozzolans were more affected by the drying shrinkage. The mortars had good mechanical resistance but from 30 to 40% pozzolan, whether artificial or natural, the resistance dropped, the dilution phenomenon caused by the partial replacement of the cement was responsible for the drop in resistance with the addition of pozzolans. The water absorption rate and the apparent density of the specimens decrease when the percentage of pozzolan increases in the mortars. Artificial pozzolan offers a better water absorption rate compared to natural pozzolan due to its higher specific surface. Natural pozzolan makes it possible to obtain a denser mortar.

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Section: Tests On Fresh Paste and Hardened Mortarmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Bayiha¹,

Bahel²,

Kenmogné³

et al. 2023

Global J. Eng. Technol. Adv.

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show abstract

“…This makes metakaolin advantageous over other pozzolans [9]. In addition, the replacement of cement with metakaolin had reduced the application of limestone in the production of cement and consequently, reduced the emission of greenhouse gases that could pollute the environment [10]. The uniqueness of kaolin as compared to other clay minerals is as a result of high abundance of quartz, pyrite, siderite, feldspar, rutile [11].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2021

Nano Plus: Sci. Tech. Nanomat.

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The idea of sourcing for innovative construction Supplementary Cementitious Materials (SCM) in concrete or mortar cannot be overemphasized. Metakaolin has always been used to replace cement in concrete or mortar batching on site. This research investigated the properties of factory produced blended cement using metakaolin obtained from three different sources and consider effects of nanosilica on blended cement mortar. The kaolin clay sourced from Ijero, Ikere, and Isan in Ekiti states were calcined at 700 ˚C for 1 hour and thereafter, characterized using X-Ray Fluorescence Analyser (XRF) and X-Ray Diffraction Analysis (XRD). Ordinary Portland Cement (OPC) clinker and 10% metakaolin were used to produce blended cement. Liquid nanosilica was synthesized from cola pod extract and silica precursor in ratio 1:5. A cement-sand ratio of 1:3 and water/binder ratio of 0.5 were used to produce metakaolin blended cement mortar with addition of nanosilica in varying percentages of 1, 2, 3, 4 and 5% by weight of the binder. The setting times and water demand of the blended cement mortar were determined. The results revealed that the setting times and water demand were observed to reduce as the percentage of nanosilica was increased to a level of 4%. In addition, results of the XRF classified metakaolin as class N pozzolans with the addition of SiO 2 , Al 2 O 3 , Fe 2 O 3 greater than 70%. Also, the SO 3 for all the clay was found to be less than 4% and the peak intensities as reflected on the XRD showing the amorphous nature of the silica.

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Production and Application of Porous Ceramic Membrane for Water and Wastewater Treatment—A Case Study in Vietnam

Chu

Tran

2023

Advanced Application of Nanotechnology to Industrial Wastewater

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Effects of metakaolin and treated rice husk ash on the compressive strength of concrete

Cited by 6 publications

References 19 publications

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

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Production and Application of Porous Ceramic Membrane for Water and Wastewater Treatment—A Case Study in Vietnam

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