Effect of lightweight fly ash aggregate microstructure on the strength of concretes

Wasserman, Rina; Bentur, A.

doi:10.1016/s0008-8846(97)00019-7

Cited by 107 publications

(62 citation statements)

References 4 publications

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“…[21][22][23] Many authors used lightweight aggregates made of fly ash in concreate to investigate the strength and durability of hardened concrete, and the influence of a lightweight fly-ash aggregate microstructure on the properties of concrete. [24][25][26][27][28][29] As expected, the compressive strength of LWAC is lower than the one produced by natural aggregate, even though LWAC can anyway serve as a structural concrete. 25 If fly-ash aggregate is sintered, it reaches a higher compressive strength of the aggregate itself, and consequently a higher compressive strength of the concrete is achieved.…”

Section: Introductionsupporting

confidence: 59%

“…Taking into account the k-value concept for the fly ash (according to EN 206: 2013 34 ), a maximum of 30 % of the cement binder was replaced by fly ash as an additive. Compressive strength tests according to the standard EN 196-1:2005 32 , as well as density tests, were performed on hardened test specimens after (7,28, and 90) days. In all cases the test specimens were cured in a climatic chamber at a temperature of 21°C and a relative humidity of 94 %.…”

Section: Preparation Of the Fly-ash Aggregate Concrete Mixesmentioning

confidence: 99%

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Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Frankovič¹,

Bosiljkov²,

Ducman³

2017

Mater. tehnol.

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Aggregates made from fly ash have been developed by means of the cold-bonding process, with the addition of Portland cement as a binder at (10, 20, and 30) % of mass fractions, and by pouring the mixtures into moulds. After curing for 28 d the samples were processed into aggregate by crushing and sieving. An aggregate containing a weight percentage of 10 % of cement was additionally produced by pelletization on a granulating plate. The density, water-adsorption capacity, porosity, compressive strengths, and frost resistance of the samples were determined. The aggregates prepared by both routes were then used to make concrete samples, whose properties were then compared to those of conventional concrete made using limestone aggregate. The compressive strength of the concrete made with the granulated aggregate reached 16.0 MPa after 28 d, whereas that of the concrete made with crushed aggregate amounted to 24.1 MPa, and that of the conventional concrete was 34.6 MPa. Keywords: fly ash, lightweight aggregates, density, compressive strength, frost resistance Agregati izdelani iz elektrofiltrskega pepela so bili razviti s postopkom hladnega vezanja, z dodatkom (10, 20 in 30) % masnega dele`a Portland cementa kot veziva in z ulivanjem me{anice v modele. Po 28 dnevnem strjevanju vzorcev so bili vzorci predelani v agregat z drobljenjem in sejanjem. Sestava, ki je vsebovala 10 masnih % cementa, je bila {e dodatno peletizirana na plo{~i za granuliranje. Dolo~ene so bile: gostota, kapaciteta absorpcije vode, poroznost, tla~na trdnost in odpornost na zamrzovanje. Sestave, izdelane na oba na}ina, so bile uporabljene za izdelavo betonskih vzorcev, katerih lastnosti so bile primerjane z lastnostmi obi~ajno izdelanega betona z uporabo sestave apnenca. Tla~na trdnost betona, izdelanega z granulirano sestavo, je dosegla 16,0 MPa po 28 dneh, medtem, ko je pri betonu izdelanem iz drobljenega agregata, zna{ala 24,1 MPa, pri obi~ajnem betonu pa je bila 34,6 MPa.

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Section: Introductionsupporting

confidence: 59%

Section: Preparation Of the Fly-ash Aggregate Concrete Mixesmentioning

confidence: 99%

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Frankovič¹,

Bosiljkov²,

Ducman³

2017

Mater. tehnol.

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“…1 b). The size of the inner pores is heterogeneous and, as mentioned in previous studies [23], large pores are usually located at the core, where the expansion begins, while smaller pores are found in the external area. The maximum inner pore diameter of variety A is approximately 2000 ).lm ( Fig.…”

Section: Sem Resultsmentioning

confidence: 71%

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2010

Cement and Concrete Composites

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“…Two factors should be taken into account when changes in density are considered: the changes in porosity and the changes in the solid density of the aggregate [13]. As mentioned above, no qualitative mineralogical differences exist between W75S25-1150-10, W50550-1150-1O and W25575-1150-1O (Table 4 and Fig.…”

Section: Microstructure/mineralogy Relationship With Dry Particle Denmentioning

confidence: 98%

“…A clear example of the relationship between microstructureproperties of LWAs is provided by Wasserman and Bentur [13], who modified the structure of LW As using four types of heat treatment and one type of polymer treatment to obtain aggregates with different absorptions, strengths and pozzolanic activity. They also induced mineralogical changes in the aggregates with these treatments.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mineralogy of lightweight aggregates manufactured from mining and industrial wastes

González-Corrochano

Alonso-Azcárate

Rodas

et al. 2011

Construction and Building Materials

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Keywords:Lightweight aggregate Microstructure MineralogyThe microstructure and mineralogy of lightweight aggregates manufactured with washing aggregate sludge, sewage sludge and a clay-rich sediment have been studied. The mineralogical analysis revealed the neo-formation of plagioclase and pyroxene group minerals and a minor presence of gehlenite. Some relationships may be established: (i) heating temperature and dwell time affect the formation of new porosity; (ii) the disappearance of pyroxenes could produce changes in the density of the solid material in the lightweight aggregates; (Hi) when an external glassy film is not present, water absorption values depend on the size and number of each type of pore.Washing aggregate sludge Sewage sludge Clay-rich sediment

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Effect of lightweight fly ash aggregate microstructure on the strength of concretes

Cited by 107 publications

References 4 publications

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Lightweight aggregates made from fly ash using the cold-bond process and their use in lightweight concrete

Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and used motor oil

Microstructure and mineralogy of lightweight aggregates manufactured from mining and industrial wastes

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