Effect of metakaolin substitution on physical, mechanical and hydration process of White Portland cement

Subaşı, Azime; Emiroğlu, Mehmet

doi:10.1016/j.conbuildmat.2015.07.125

Cited by 60 publications

(21 citation statements)

References 32 publications

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“…The degradation process was defined by three temperature intervals: 0-240 • C (1.08%), 240-500 • C (0.70%) and 500-1000 • C (2.56%). The X-ray diffraction [19] indicated high contents of CaO and SiO 2 , which define the main crystalline compounds of the cement-tricalcium silicate and dicalcium silicate-while the Al is found in small quantities, which determine the presence of the mineralogical compound of tricalcium aluminate, confirmed also by References [47][48][49][50]. Also, the X-ray diffraction of the white cement captures the presence of TiO 2 , which is responsible for the white pigment of the Portland cement [47].…”

Section: Bindersmentioning

confidence: 61%

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

2020

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Interdisciplinary and sustainability represent the main characteristics of this paper due to the fact that this research is offering a connection between two main areas-agronomy and construction, by using hemp shiv for the design of new building materials, which can increase the sustainability level of the building industry. For this reason, the main scope of this study is based on the investigation of a new category of composite building materials-lightweight mortars based on hemp shiv, volcanic rocks and white cement-which contribute to a positive environmental impact and help to increase indoor comfort. A complex report was carried out on two segments. The first one is focused upon the characteristics of the raw materials from the composition of the new materials, while the second segment presents a detailed analysis of these composites including morphological and chemical investigation, pyrolytic and fire behavior, compression and flexural strengths, and acoustic and thermal characteristics. The proposed recipes have as a variable volcanic rocks, while the hemp and the binder maintain their volumes and properties. The results were analyzed according to the influence of volcanic rocks on the new composites.Crystals 2020, 10, 102 2 of 21 consideration in the construction sector. There is a significant number of studies on hemp shiv with lime, which is a composite material named hempcrete [12][13][14], but there are only few studies that concern hemp shiv with cement [15][16][17][18][19].Due to the fact that hemp shiv presents poor fire resistance, a new approach can be made with volcanic rocks, which are natural products with higher fire resistance [20]. These materials are usually found in the composition of mortars used in the rehabilitation process of the walls, because of their increased mechanical resistances [21]. They also present sound and thermal properties, as well as a low density, which will help the workability of the mortar. Durable and with higher strength properties for structural application [20], volcanic rocks are low cost materials [22] that also present fire retarding properties for steel structures [23].Therefore, the purpose of this paper is to analyze the impact of the volcanic rocks when these are incorporated in hemp-cement composite materials used as interior mortars. These building materials are developed to be suitable not only for eco-friendly construction but also in regular buildings made from concrete, steel, and so forth, where they can increase indoor comfort. Materials and Methods Raw MaterialsThe composition of the new materials is designed to increase indoor comfort by developing new types of lightweight mortars, obtained as prefabricated plates. In order to understand the characteristics of the new composites, hemp shiv, natural and treated; volcanic rocks, perlite and vermiculite; and binders, white cement and hydrated lime, were analyzed. Hemp ShivThe hemp shiv used for the new composites was received from HempFlax Romania (Pianu De Jos, Alba, Romania). The chemical stru...

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Section: Bindersmentioning

confidence: 61%

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

2020

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“…The biggest load resisted by all samples has not much variation between them, even compared to the control sample M9. In contrast with Subasi and Emiroglu [21], it is impossible to state that flexural strength of unreinforced samples decreases due to the addition of pozzolanic reactive materials such as MK.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 86%

“…The benefits of producing binary OPC and MK binders has been contradicted by some researchers where they have found poorer effects on concrete and mortar samples with additions of pozzolanic materials. Subasi and Emiroglu [21] stated an inversely proportional decrease in compressive strength by increasing the amount of MK replacement particularly at seven and 28 days of curing. Similarly, Vejmelkova et al [12] highlighted worse results by the age of 28 days in mortar and concrete mixes.…”

Section: Introductionmentioning

confidence: 97%

Microstructure, electrical and mechanical properties of steel fibres reinforced cement mortars with partial metakaolin and limestone addition

Alvarez

Nazari

Bagheri

et al. 2017

Construction and Building Materials

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“…Both water absorption and sorptivity are influenced by the concrete pore size distribution and capillary pore interconnectivity [21]. Various studies [22]- [24] show that incorporating metakaolin in concrete tends to refine concrete pore size, reduce the interconnectivity, but may increase the total porosity.…”

Section: Water Absorption and Sorptivitymentioning

confidence: 99%

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

Bakera¹,

Alexander

2019

RILEM Tech Lett

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Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

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Effect of metakaolin substitution on physical, mechanical and hydration process of White Portland cement

Cited by 60 publications

References 32 publications

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

Experimental Investigations on the Performances of Composite Building Materials Based on Industrial Crops and Volcanic Rocks

Microstructure, electrical and mechanical properties of steel fibres reinforced cement mortars with partial metakaolin and limestone addition

Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

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