Pozzolanas and Pozzolanic Materials

McCarthy, Michael J.; Dyer, Tom

doi:10.1016/b978-0-08-100773-0.00009-5

Cited by 63 publications

(17 citation statements)

References 272 publications

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“…is indicates that the compressive strength of BLA-blended concrete decreases with an increase in BLA content. e reason for compressive strength reduction is due to the high replacement of BLA and cement content reduction per cubic meter of concrete by 5%, 10%, 15%, and 20% from the normal concrete mix, also the pozzolanic reaction takes a long time, and this leads to compressive strength reduction [16].…”

Section: Compressive Strengthmentioning

confidence: 99%

Experimental Investigation on Effect of Partial Replacement of Cement with Bamboo Leaf Ash on Concrete Property

Abebaw

Bewket

Getahun

2021

Advances in Civil Engineering

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Ethiopia’s construction industry is aggressively expanding than ever before. Cement is the most essential and expensive material in this regard. Cement takes 10%–15% by volume of concrete. Nowadays, the construction industry is challenged by the scarcity of cement and price escalation of the cement market. However, scholars try to replace cement with pozzolanic material. Besides this, they investigated that bamboo leaf ash possesses pozzolanic properties. Ethiopia has about 850,000 hectares of lowland bamboo, so it is good to utilize bamboo leaf ash as a replacement material for cement. In this study, the capability of lowland Ethiopian bamboo leaf ash as a partial substitute for cement in C-25 concrete production with 0%, 5%, 10%, 15%, and 20% replacement of OPC by BLA with 0.49 percent water-to-cement ratio was investigated. This study examines the chemical properties of BLA, physical properties of cement paste, workability, compressive strength, water absorption, density, and sulfate attack of concrete. The chemical composition of bamboo leaf ash was examined, the summation of SiO2, AlO3, and FeO3 is 76.35%, and the ash was classified class N pozzolan. The normal consistency percentage of water increases as the BLA replacement amount increases, and both initial and final setting time ranges increase as the BLA replacement amount increases. The compressive strength of concrete for 5% and 10% BLA achieves the target mean strength (33.5 MPa) on the 28th day, and on the 56th day, 5% and 10% replacements increase the concrete strength by 1.84% and 0.12%, respectively. The water absorption and sulfate attack have significant improvement of the BLA-blended concrete on 5% and 10% BLA content. According to the findings, bamboo leaf ash potentially substitutes cement up to 10%. The outcome of the study will balance the cement price escalation and increase housing affordability without compromise in quality.

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Section: Compressive Strengthmentioning

confidence: 99%

Experimental Investigation on Effect of Partial Replacement of Cement with Bamboo Leaf Ash on Concrete Property

Abebaw

Bewket

Getahun

2021

Advances in Civil Engineering

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“…The compressive strength of mix MGW-10, MGW-15, MGW-20, and MGW-25 reached up to approximately 88% of the control mix due to the pozzolanic reaction [5,17,37,38] of glass powder, thus representing an optimum limit if glass powder replacement up to 20% of cement without losing considerable strength. As the pozzolanic activity [39] takes place in the abundance of water, so the specimens were cured to check the compressive strength of high volume WGP concrete compressive strength results. The result of the prolonged cured concrete with varying percentages of WGP is shown in Figure 11.…”

Section: Days Normally Cured Concrete Specimensmentioning

confidence: 99%

Development of Environment-Friendly Concrete through Partial Addition of Waste Glass Powder (WGP) as Cement Replacement

et al. 2020

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This paper presents the study carried out on the utilization of Waste Glass Powder (WGP) as supplementary cementitious material in concrete. The evaluation of the influence of WGP on the mechanical properties of concrete was carried out by casting and testing of concrete samples as per ASTM standards (cylinders and beam elements). The control samples were designed to represent field conditions with a target compressive strength of 20,000 kPa. The Portland cement in concrete was substituted with WGP in proportions of 0%-35% by weight, in increments of 5%. Two curing domains were adopted in the preparation of the test samples to evaluate the effect of pozzolanic material wherein the tested samples were cured for 28, 56, and 84 days. The study results indicated a reduction in compressive strength of concrete up to 10% with partial replacement of cement with 25% of WGP when standard curing of 28 days was adopted. Furthermore, with the same replacement proportion and prolonged curing for 84 days, the gap in strength reduction was reduced by 5%. However, a significant decrease in workability was noted between the control concrete samples and glass powder infused concrete. Furthermore, the Waste Glass Powder Concrete (WGPC) exhibited an improved flexural strength with the modulus of rupture for WGPC being 2% higher than control concrete at the age of 84 days. Based on the results of this study it was concluded that 25% replacement of cement with WGP provides an optimum replacement ratio. Doi: 10.28991/cej-2020-03091620 Full Text: PDF

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“…Around 95 per cent of the total alkali content could be immobilized in calcium silicate hydrates by blended cement pastes, compared to about 15 percent in those containing only Portland cement. In solid phases, potassium is present in higher concentrations than sodium [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

Durability of Blended Cements Made with Reactive Aggregates

et al. 2021

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Alkali–silica reaction (ASR) is a swelling reaction that occurs in concrete structures over time between the reactive amorphous siliceous aggregate particles and the hydroxyl ions of the hardened concrete pore solution. The aim of this paper is to assess the effect of pozzolanic Portland cements on the alkali–silica reaction (ASR) evaluated from two different points of view: (i) alkali-silica reaction (ASR) abatement and (ii) climatic change mitigation by clinker reduction, i.e., by depleting its emissions. Open porosity, SEM microscopy, compressive strength and ASR-expansion measurements were performed in mortars made with silica fume, siliceous coal fly ash, natural pozzolan and blast-furnace slag. The main contributions are as follows: (i) the higher the content of reactive silica in the pozzolanic material, the greater the ASR inhibition level; (ii) silica fume and coal fly ash are the best Portland cement constituents for ASR mitigation.

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Pozzolanas and Pozzolanic Materials

Cited by 63 publications

References 272 publications

Experimental Investigation on Effect of Partial Replacement of Cement with Bamboo Leaf Ash on Concrete Property

Experimental Investigation on Effect of Partial Replacement of Cement with Bamboo Leaf Ash on Concrete Property

Development of Environment-Friendly Concrete through Partial Addition of Waste Glass Powder (WGP) as Cement Replacement

Durability of Blended Cements Made with Reactive Aggregates

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