Natural Pozzolan as a Partial Substitute for Cement in Concrete

Al-Chaar, Ghassan; Alkadi, Mouin; Asteris, Panagiotis G.

doi:10.2174/1874836801307010033

Cited by 49 publications

(23 citation statements)

References 24 publications

(20 reference statements)

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“…Many researchers have investigated the chemical and pozzolanic potential of these scoria materials obtained from different scoria cones. e chemical analysis result showed a high percentage of silica (35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49).5%) in all the samples, and it was also found that almost 97% of the samples showed positive pozzolanic activity [32]. In the current study, the scoria material was collected from Harrat Rahat, Jabal Khada quarry in Madinah Province, Saudi Arabia.…”

Section: Volcanic Ashmentioning

confidence: 83%

“…Many researchers have evaluated the pozzolanic potential of basaltic volcanic ash when it is used as a replacement of cement in mortar and concrete. ey found that up to 20% of substitution of cement with volcanic ash gives better strength and durability properties at normal curing temperature [32][33][34][35][36][37][38]. No research has yet evaluated the performance of this locally available basaltic volcanic ash in mortar and concrete under elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Elevated Temperatures on Mortar with Naturally Occurring Volcanic Ash and Its Blend with Electric Arc Furnace Slag

Khurram

Khan

Saleem

et al. 2018

Advances in Materials Science and Engineering

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e mechanical behavior of basaltic volcanic ash (VA) and fly ash (FA) as a cement replacement under elevated temperatures is mainly investigated in the current study. For this, cement content has been partially replaced with and without the presence of electric arc furnace slag (S). Four distinct ranges of temperatures (200°C, 400°C, 600°C, and 800°C) were selected, and the modified mixes were subjected to these gradually elevated temperatures. Samples were cured and cooled by using air-and water-cooling techniques. Test results were established by examining the sample weights and compressive strength before and after the exposure of each temperature level. e pozzolanic potential of volcanic ash and fly ash samples was identified using the strength activity index. After analyzing the test results, it has been found that there is a significant effect on the compressive strength of mortar mixes at the early ages of its strength gain. However, at the later ages of curing, samples modified with volcanic and fly ash with the presence of electric arc furnace slag have shown a better performance than control mix in terms of strength and weight loss.

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Section: Volcanic Ashmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effect of Elevated Temperatures on Mortar with Naturally Occurring Volcanic Ash and Its Blend with Electric Arc Furnace Slag

Khurram

Khan

Saleem

et al. 2018

Advances in Materials Science and Engineering

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“…The mechanical strength of mortar containing VS, LF, or both could be adequately predicted using (5). Development of such a good relationship between mechanical strengths and the supplementary cementing materials could be of considerable benefit.…”

Section: Discussionmentioning

confidence: 99%

“…Natural pozzolan is being widely used as cement replacement due to its ecological, economic, and performance-related advantageous properties [1][2][3][4][5][6]. However, its use caused longer setting times and lower early strengths compared with plain Portland cement [7,8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

al-Swaidani

Soud

Hammami

2017

Advances in Materials Science and Engineering

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Natural pozzolan is being widely used as cement replacement. Despite the economic, ecological, and technical benefits of its adding, it is often associated with shortcomings such as the need of moist-curing for longer time and a lower early strength. This study is an attempt to investigate the effect of adding limestone filler on the compressive strength and durability of mortars/concrete containing scoria. Sixteen types of binders with different replacement levels of scoria (0, 10, 20, and 30%) and limestone (0, 5, 10, and 15%) were prepared. The development of the compressive strength of mortar/concrete specimens was investigated after 2, 7, 28, and 90 days' curing. In addition, the acid resistance of the 28 days' cured mortars was evaluated after 90 days' exposure to 5% H 2 SO 4 . Concrete permeability was also evaluated after 2, 7, 28, and 90 days' curing. Test results revealed that there was an increase in the early-age compressive strength and a decrease in water penetration depths with adding limestone filler. Contrary to expectation, the best acid resistance to 5% H 2 SO 4 solution was noted in the mortars containing 15% limestone. Based on the results obtained, an empirical equation was derived to predict the compressive strength of mortars.

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“…Natural pozzolans are being widely used as substitute for Portland cement because of their ecological, economical and performance-related advantageous properties (5)(6)(7)(8)(9)(10)(11)(12). After thousands of years, natural pozzolan-containing concretes are still used today owing to their good mechanical and durability properties (13).…”

Section: Introductionmentioning

confidence: 99%

Production of more durable and sustainable concretes using volcanic scoria as cement replacement

al-Swaidani

2017

Mater. construcc.

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The objective of the study is to investigate strength and durability-related properties of volcanic scoria-based cements. Compressive and tensile strength development of mortars and concretes containing volcanic scoria with replacement levels ranging from 10 to 35% was investigated. Water permeability, chloride penetrability and porosity of concretes cured for 2, 7, 28, 90 and 180 days were also examined. Results revealed that volcanic scoria could be suitable for making blended cements. The strength of mortar/concrete containing volcanic scoria was lower than that of plain cement mortar/concrete at all ages. However, at 90 day curing, the strengths of volcanic scoria-based mortars/concretes were comparable to those of plain cement. In addition, water permeability, chloride penetrability and porosity of scoria-based concretes were much lower than those of plain concrete. Further, the results were statistically analysed and estimation equations have been developed to predict the studied properties. SEM/EDX analysis was employed, as well.

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Natural Pozzolan as a Partial Substitute for Cement in Concrete

Cited by 49 publications

References 24 publications

Effect of Elevated Temperatures on Mortar with Naturally Occurring Volcanic Ash and Its Blend with Electric Arc Furnace Slag

Effect of Elevated Temperatures on Mortar with Naturally Occurring Volcanic Ash and Its Blend with Electric Arc Furnace Slag

Improvement of the Early-Age Compressive Strength, Water Permeability, and Sulfuric Acid Resistance of Scoria-Based Mortars/Concrete Using Limestone Filler

Production of more durable and sustainable concretes using volcanic scoria as cement replacement

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