Optimum limestone powder amount in mortars with over silica fume

Turğut, Paki; Ogretmen, Abdullah

doi:10.14382/epitoanyag-jsbcm.2019.11

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…The consistency of the mixtures in which EP is substituted by 6% and the control mixtures without EP are very close to each other, and an increase in the water requirement was observed when the replacement ratio increased to 18%. Since calcite has a hydrophobic characteristic (Turgut, 2018;Turgut and Ogretmen, 2019;Demirhan, 2020), a partial decrease in consistency has been observed with the use of both nano and micronized calcite.…”

Section: Consistencymentioning

confidence: 99%

Effect of Calcite on Fresh and Hardened Properties of Expanded Perlite Blended Cement Mortars

ENSARİOĞLU

DEMİRHAN

2022

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Expanded perlite, which is mostly used for purposes such as lightweight concrete and insulation, contains a high percentage of silica and alumina. Problems in early-term strength development occur with the high-volume substitution of normal weight and lightweight pozzolanic materials in the production of cement. It was thought that it would be important to examine the early period fresh and hardened properties of expanded perlite blended cement including nano and micronized calcite minerals with high reactivity and high specific surface area/volume ratio. For this purpose, a total of nine different mortar mixtures containing 0%, 6% and 18% expanded perlite and 5% nano and micronized calcite were designed for replacing by cement. For mortar samples modified with nano and micronized calcite and containing expanded perlite at different rates; mini slump flow test, standard consistency, setting times and soundness (Le Chatelier Method) tests/analyses were performed as fresh and early period properties. In addition to this, compressive strength and ultrasound pulse velocity tests were performed for the curing ages of 7, 28 and 120 days as hardened properties. Experimental results showed that expanded perlite negatively affects the early and hardened properties of mortars, and in general, improvements are achieved with nano/micronized calcite substitution. 23.2% and 45.4% of strength development has been achieved in the mixture including both calcite and expanded perlite within the curing ages of 7-28 days and 7-120 days, respectively. Also, a maximum of 5.7% of reduction was observed in EP blended cement mortars, including 18% of EP. Since nano-sized calcite has a higher surface area compared to micronized calcite, better contributions to the fresh and hardened properties were observed in the utilisation of nano-sized calcite.

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Section: Consistencymentioning

confidence: 99%

Effect of Calcite on Fresh and Hardened Properties of Expanded Perlite Blended Cement Mortars

ENSARİOĞLU

DEMİRHAN

2022

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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“…Average results found via Vicat Test Method are given in Figure 3.1. As seen in the Figure, test results showed that although nanomaterials are expected to increase the water requirement due to their high specific surface area, as the usage rate of NC increases, the water requirement needed for standard consistency has decreased due to the hydrophobic structure of NC (Lu and Wang 2010;Turgut 2018;Turgut 2019;Demirhan et al 2019). Fly ash which is finer than cement has increased the water demand required for standard consistency as fly ash replacement level increased.…”

Section: Setting Timesmentioning

confidence: 99%

Nano Boyutlu Kalsit ve Uçucu Külün, Harçların Hidratasyonu ve Mikroyapısal Özellikleri Üzerindeki Kombine Etkileri

Demirhan¹

2020

Afyon Kocatepe University Journal of Sciences and Engineering

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Even though a reduction in pollution and CO2 emission can be achieved by the utilization of fly ash in cement-based materials, using a high volume of fly ash results in a reduction at the early age strength development and also setting time delays. In order to assess hydration mechanism and microstructural characteristics of high-volume fly ash blended cement mortars, nano-sized calcite was introduced into the mortars to evaluate the combined effect of fly ash (FA) and nano-sized calcite (NC). For this purpose, twelve mixtures in which fly ash to Portland cement ratios and NC (used as minor addition up to 5%) percentages were varied as 0.0, 0.25, 0.54, 1.0 and 0.0%, 2.5%, 5%, respectively, were designed. Consistency, setting times, compressive strength, ultrasonic pulsive velocity and SEM analysis were conducted at varied curing ages (which depends on the testing method) in terms of fresh and hardened properties and micro-structural characteristics. Experimental test results confirmed that fresh and hardened properties of standard mortars were significantly improved with the combination of both FA and NC especially at early ages. Even though decrease in early age compressive strength values was obtained as FA amount was increased, (comparing to control mixture which was 43.2 MPa at 90 days) higher compressive strength result (45.9 MPa) was obtained at 90-day curing age of mixture including 50% of FA content being utilized by NC of 2.5%.

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Optimum limestone powder amount in mortars with over silica fume

Cited by 2 publications

References 37 publications

Effect of Calcite on Fresh and Hardened Properties of Expanded Perlite Blended Cement Mortars

Effect of Calcite on Fresh and Hardened Properties of Expanded Perlite Blended Cement Mortars

Nano Boyutlu Kalsit ve Uçucu Külün, Harçların Hidratasyonu ve Mikroyapısal Özellikleri Üzerindeki Kombine Etkileri

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