Effect of ultrafine fly ash on the properties of concretes containing construction and demolition wastes as coarse aggregates

Shaikh, Faiz Uddin Ahmed

doi:10.1002/suco.201500030

Cited by 31 publications

(15 citation statements)

References 23 publications

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“…FA25 has the lowest SAI values which are under 75% at all ages. This may be caused by the slower pozzolanic reaction of SiO 2 and Al 2 O 3 in FA with calcium hydroxide in the mortars as observed in other studies . SF5 have shown the best pozzolanic activity at all ages with a slight decrease at the age of 180 days.…”

Section: Resultsmentioning

confidence: 50%

“…This may be caused by the slower pozzolanic reaction of SiO 2 and Al 2 O 3 in FA with calcium hydroxide in the mortars as observed in other studies. 15,45 SF5 have shown the best pozzolanic activity at all ages with a slight decrease at the age of 180 days. While the replacement of SF increases, SAI values increases slightly as aging increases.…”

Section: Flexural Strengthmentioning

confidence: 93%

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Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

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In this paper, the results of experimental work on the strength and durability performances of self‐compacting mortars (SCMs) manufactured from silica fume (SF) and fly ash (FA) were presented. The cement was partially replaced with 5, 10, 15, 20, and 25% of FA and 5, 10, and 15% of SF as binary mixes. Also, ternary mixtures were prepared by the incorporation of FA and SF at different replacement dosages by weight. In total, 14 different combinations of mixes were studied at the ages of 7, 28, and 180 days. Prismatic samples of size 40 × 40 × 160 mm3 were produced and exposed to water curing to observe mechanical behavior of SCMs. The mechanical properties of SCMs were examined by the tests of compressive strength and flexural strength. Sorptivity, porosity, water absorption, and density were also measured. To evaluate fresh properties of SCMs, mini slump flow diameter and mini V‐funnel flow time tests were conducted. The results of the study reveal that increase in the dosage of FA increases SCMs flow but also reduce segregation resistance. The enhancement in flexural strength is the best in the binary mixes of SF10 and in binary mixes of FA. Ten percent replacement of FA shows the best flexural strength performance with a value of 10.21 MPa at the age of 180 days. Compressive and flexural strengths of mortars containing SF and FA reached up to about 86.14 and 10.50 MPa, respectively.

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Section: Resultsmentioning

confidence: 50%

Section: Flexural Strengthmentioning

confidence: 93%

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Benli

2019

Structural Concrete

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“…Recycled aggregates are sourced from crushed demolished concrete structures and are used as partial replacement of natural aggregates in concrete. A very good level of understanding exists on various properties of concretes containing SCMs and recycled aggregates either individually or combined through significant amount of research [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Durability Properties of Green Star Concretes

Shaikh

2018

Buildings

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This paper presents mechanical and durability properties of green star concretes. Four series of concretes are considered. The first series is control concrete containing 100% ordinary Portland cement, 100% natural aggregates and fresh water. The other three series of concretes are green star concretes according to Green Building Council Australia (GBCA), which contain blast furnace slag, recycled coarse aggregates and concrete wash water. In all above concretes compressive strength, indirect tensile strength, elastic modulus, water absorption, sorptivity and chloride permeability are measured at 7 and 28 days. Results show that mechanical properties of green star concretes are lower than the control concrete at both ages with significant improvement at 28 days. Similar results are also observed in water absorption, sorptivity and chloride permeability where all measured durability properties are lower in green star concretes compared to control concrete except the higher water absorption in some green star concretes.

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“…Construction and demolition waste accounts for approximately 40% of Australia's solid waste materials, with 160 million tonnes of virgin aggregates being mined every year. In 2008, a total of 19 million tonnes of C&D waste was disposed of in Australia, in which only 10.5 million tonnes, or 55%, of this waste was recycled, leaving 45% of waste sent to landfills around Australia (Shaikh, 2016). Scotland's 9 million tonnes of C&D waste account for over 44% of the country's total annual waste, in which 75% is being re-used (Medina, et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Study on the Replacement of Construction & Demolition Waste Materials as Fine Aggregates in the Production of Low Strength Concrete

Quedou¹

2018

IJRASET

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The construction industry is searching for a more ecological material which can provide a good sustainability and also have the eco-friendly label. The quest to protect the environment has enabled researches to find alternate materials which can fit the concrete matrix to produce a concrete that can meet the demand of the construction industry. The purpose of this research is to substitute traditional materials with construction and demolition waste by keeping the same slump value and by replacing natural fine aggregates (NFA) with Construction and Demolition Waste (C&D) materials and investigate their properties on fresh and hardened concrete. To determine and compare the properties, different tests were performed to evaluate the workability, density, compressive strength, flexural strength and absorption of each concrete mix. The results demonstrated that, construction and demolition waste materials with a define slump range decreases the compressive strength and flexural strength, and the water absorption increases with increasing C&D content.

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Effect of ultrafine fly ash on the properties of concretes containing construction and demolition wastes as coarse aggregates

Cited by 31 publications

References 23 publications

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Mechanical and durability properties of self‐compacting mortars containing binary and ternary mixes of fly ash and silica fume

Mechanical and Durability Properties of Green Star Concretes

Study on the Replacement of Construction & Demolition Waste Materials as Fine Aggregates in the Production of Low Strength Concrete

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