Effect of Pakistani bentonite on properties of mortar and concrete

Ahmad, Shahreer; Barbhuiya, Salim; Elahi, Ayub; Iqbal, Javed

doi:10.1180/claymin.2011.046.1.85

Cited by 78 publications

(48 citation statements)

References 15 publications

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“…This improvement is be due to the micro-filler effect of Mmt clay being a fine-grained material. Excess Mmt above this 25% replacement level is more than the pore filling requirement that causes weakness, which can lead to an increase in sulfate attack, ultimately reducing the compressive strength [50]. This is in line with the findings of other studies [32,36], that CH is the most allergic component for the corrosive media.…”

Section: "800°c Calcined" Mmt Modified Mortarssupporting

confidence: 89%

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Durability of Mortars Modified with Calcined Montmorillonite Clay

et al. 2019

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This study aims to evaluate the performance of mortars containing locally available Pakistani montmorillonite (Mmt) clay mineral as partial replacement of cement in various curing environments. The local montmorillonite clay in “As is” (20°C) and “heated” (100°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C & 1000°C) conditions was incorporated in mortar cubes as partial replacement of cement. Montmorillonite clay of all the temperatures was replaced by 15%, 20%, 25%, 30% and 35% of cement mass in mortar cubes. The Strength Activity Index (SAI) was calculated to determine the optimum activation temperature for the clay. Compressive strengths of the controlled mix and montmorillonite modified mortars were evaluated under the Sodium Sulfate (SS) (5% solution) and mixed (Sodium Sulfate + Sodium Chloride (SCS)) (5% +3.5% solution) curing environments to study its durability performance. Upon thermal treatment montmorillonite clay showed maximum activation at 800°C temperature. Mortar containing (800°C) calcined montmorillonite clay with 25% cement replacement exhibit competent compression results. Moreover, up on exposure to aggressive environments, montmorillonite clay mortars performed better than the control samples. The mortar cubes exposed to Sulfate environment (SS) were more damaged in compression than that exposed to mixed environment (SCS), for all replacement levels and time exposures.

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Section: "800°c Calcined" Mmt Modified Mortarssupporting

confidence: 89%

“…This improvement of gain rate is due to the activation of Mmt clay with temperature. By heating the clay at an optimum calcined temperature its pozzolanic reactivity can be enhanced/improved as found by [49][50][51][52]. With the age gain rate continued to increase progressively with more speed in this case.…”

Section: "800°c Calcined" Mmt Modified Mortarsmentioning

confidence: 58%

Durability of Mortars Modified with Calcined Montmorillonite Clay

et al. 2019

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“…Bentonite is a montmorillonite type clay that can be thermally treated to produce a pozzolan, and can be used by the construction industry as a supplementary cementitious material . There exist a limited number of studies related to alkali‐activation of thermally treated bentonite.…”

Section: Wastes From the Mining And Mineral Industriesmentioning

confidence: 99%

Management and valorisation of wastes through use in producing alkali‐activated cement materials

Bernal

Rodríguez

Kirchheim

et al. 2016

J of Chemical Tech & Biotech

144

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract 15There is a growing global interest in maximising the re-use and recycling of waste, to 16 minimise the environmental impacts associated with waste treatment and disposal. Use 17 of high-volume wastes in the production of blended or novel cements (including alkali-18 activated cements) is well known as a key pathway by which these wastes can be re-19 used. This paper presents a critical overview of the urban, agricultural, mining and 20 industrial wastes that have been identified as potential precursors for the production of 21 alkali-activated cement materials, or that can be effectively stabilised/solidified via 22 alkali activation, to assure their safe disposal. The central aim of this review is to 23 elucidate the potential advantages and pitfalls associated with the application of alkali-24 activation technology to a wide variety of wastes that have been claimed to be suitable 25 for the production of construction materials. A brief overview of the generation and 26 characteristics of each waste is reported, accompanied by identification of opportunities 27 for the use of alkali-activation technology for their valorisation and/or management. 28

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“…Moreover scientific attention is being focused also on utilization of natural clays and clay minerals due to their unique physico-chemical properties and/or optimal morphological structure as lime binder replacement. For instance sepiolite [17][18][19][20], palygorskite [21], zeolite [22,23], vermiculite [24] and bentonite [25][26][27] have been added to mortars and cements to improve their characteristics.…”

Section: Introductionmentioning

confidence: 99%