Freeze–Thaw Resistance of Lightweight Concrete and Aggregate at Different Freezing Rates

Mao, Jize; Ayuta, Koichi

doi:10.1061/(asce)0899-1561(2008)20:1(78)

Cited by 34 publications

(19 citation statements)

References 3 publications

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“…As a result, when using a pre-dry aggregate and tighter matrix (w/c = 0.37), no signs of damage or decrease in strength were observed, not only after 150 cycles, but also after 200 cycles. The results proved the observation made in [27,32], that the application of an initially dry aggregate may lead to a comparable or much better frost resistance of lightweight concretes compared to ordinary concretes of a similar volume composition.…”

Section: Freeze-thaw Resistancesupporting

confidence: 88%

“…This has also been confirmed by assessments of the state of concrete in existing structures exposed to cyclic freezing and thawing [ 30 , 31 ]. Moreover, it was proven in [ 27 , 32 ] that, by using dry aggregate, it is possible to achieve a comparable or much better frost resistance of lightweight concretes compared to ordinary concretes, even in the case of concretes having the same volume composition. By replacing the normal-weight aggregate, in part or even in entirety, with several types of LWA (Leca 670, Leca 800, Liapor 8), it is possible to improve the frost resistance.…”

Section: Introductionmentioning

confidence: 99%

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Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate

Domagała

2020

Materials

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The aim of this study was to present the problem of durability of structural lightweight concrete made of a sintered fly ash aggregate. The issue of durability was researched for 12 concrete series in terms of their water absorption, water permeability, and freeze-thaw resistance. Additionally, the microstructure of several concretes was analyzed with a scanning electron microscope (SEM). In the durability research, the influences of the following parameters were taken into consideration: The initial moisture content of sintered fly ash (mc = 0, 17–18, and 24–25%); the aggregate grading (4/8 and 6/12 mm); and the water-cement ratio (w/c = 0.55 and 0.37). As a result of various compositions, the concretes revealed different properties. The density ranged from 1470 to 1920 kg/m3, and the corresponding strength ranged from 25.0 to 83.5 MPa. The durability research results of tested lightweight concretes showed that, despite considerably higher water absorption, a comparable water permeability and comparable or better freeze-thaw resistance in relation to normal-weight concrete may be present. Nevertheless, the fundamental requirement of lightweight concrete to achieve good durability requires the aggregate’s initial moisture content to be limited and a sufficiently tight cement matrix to be selected. The volume share of the cement matrix and aggregate, the cement content, and even the concrete strength are of secondary importance.

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Section: Freeze-thaw Resistancesupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate

Domagała

2020

Materials

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“…As the remaining mass of RPA blocks follows a linear reduction path, the remaining mass after 50 cycles is extrapolated to be 99.1%, which satisfies the weathering criteria (less than 1.0% per 50 cycles) for paving units (Table 1) [32]. The durability of RPA blocks is therefore adequate and at least comparable with those of lightweight aggregate and lightweight concrete involving recycled plastic-waste aggregate (Figure 5) [40,41]. Previous freeze-thaw studies of conventional and permeable pavers found that rubberized pervious concrete sustains a mass loss of 3.5% over 240 cycles, and plane concrete and clay-soil blocks sustain mass losses of 34.0% over 300 cycles and 0.7% over 28 cycles, respectively (Table 2) [42,43].…”

Section: Performance Summary and Economic Feasiblity Of Rpa Blockmentioning

confidence: 93%

Pervious Pavement Blocks Made from Recycled Polyethylene Terephthalate (PET): Fabrication and Engineering Properties

2020

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The importance of permeable and pervious pavements in reducing urban stormwater runoff and improving water quality is growing. Here, a new pervious pavement block material based on recycled polyethylene terephthalate (PET) waste is introduced, which could contribute to reducing global plastic waste via PET’s utilization for construction material fabrication. The engineering properties and durability of recycled PET aggregate (RPA) pervious blocks are verified through flexural tests, in situ permeability tests, clogging tests, and freeze-thaw durability tests, and their cost-effectiveness is assessed by comparison with existing permeable/pervious pavers. Their engineering and economic characteristics confirm that the RPA pervious blocks are suitable for use in urban paving.

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“…It is well-known that aggregates with a lower porosity and a greater proportion of fine pores possess better frost resistance. 37 The results of the tests that were performed in order to determine the frost resistance of the investigated aggregate indicated a significant loss of mass upon freezing ( Table 7), which was especially severe in the case of the granulated aggregate (GT1), where the loss of mass amounted to 96.7 %. The very high loss of mass (96.7 %) on freezing of the granulated fly ash aggregates could be ascribed to the very high porosity (water absorption of 57.8 %) and the very low crushing strength (0.96 MPa).…”

Section: Determination and Optimization Of Aggregate Frost Resistancementioning

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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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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Freeze–Thaw Resistance of Lightweight Concrete and Aggregate at Different Freezing Rates

Cited by 34 publications

References 3 publications

Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate

Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate

Pervious Pavement Blocks Made from Recycled Polyethylene Terephthalate (PET): Fabrication and Engineering Properties

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

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