Mechanical Properties and Permeability of Recycled Aggregate Concrete at Low Water/Binder Ratio

Peng, Gai Fei; Liu, Qi Bin; Guo, Zhu Bo; Hou, Qiao Xing; Cao, Si Qi; Zhang, Jiu Feng

doi:10.4028/www.scientific.net/kem.477.16

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Analysis indicated that the 3rd layer of unmodified RAC specimens of RO had a chloride content slightly higher than the optimum limit specified in BS 8110. This is consistent with those of previous studies [ 1,4,6,14] in which the chloride ion level of the concrete is strongly influenced by its permeability for water absorption and its function of porosity. The air void and the pores structure will increase, thereby decreasing the resistance to chloride penetration.…”

Section: Resultssupporting

confidence: 93%

“…The RAC increases with the RCA ratio, according to Evangelista and de Brito [4] and Kou and Poon [5], due to RAC deteriorations due to chloride penetration. Peng et al [6] have reported the reduction in chloride resistance, due mainly to the porosity and high permeability factors of RAC due to the lower performance of RCA compared to the natural aggregate. Gomes and de Brito [2] and Ann et al [1] have confirmed that penetration of chloride is largely dependent on its porosity and permeability.…”

Section: Introductionmentioning

confidence: 99%

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Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres

Ismail

Ramli

2020

MSF

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This paper presents a study that aimed to assess the chloride penetration depth of recycled aggregate concrete (RAC) modified by using treated coarse recycled concrete aggregate (RCA), adding polyolefin (PO) or polypropylene (PP) fibre and comparing with normal concrete. The coupling effects of the treated RCA and fibres on the chloride penetration of RAC were analysed after two different curing regimes (i.e. normal and seawater) and tested at different curing ages (i.e. 90, 180 and 300 days). Results showed that the inclusion of treated coarse RCA can reduce porosity, thereby decreasing the chloride penetration of RAC. However, the coupling effects of treated coarse RCA and fibre, especially on the use of PO fibre, can enhance the results.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres

Ismail

Ramli

2020

MSF

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“…Based on the permeability results of the proposed concrete, the authors concluded that recycled aggregates partially replacing fine and coarse aggregates give almost similar properties as conventional concrete. The test results of concrete made with various alternative materials [7][8][9][10][11][12][13][14][15][16][17] regarding suitability [18], strength and durability [19], root cause of waste generation [20], sustained loading for 9 and 12 months [21,22], fire resistance at 1000C for 18 and 24 hours [23,24] show the promising effects of recycled aggregates as replacement materials suitable to be used in new concrete. Demolishing waste has also been tested as replacement of fine aggregates.…”

Section: Imentioning

confidence: 99%

Water Penetration of Concrete made with Coarse Aggregates from Demolishing Waste

Koondhar

Memon

Oad

et al. 2020

Eng. Technol. Appl. Sci. Res.

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The results of laboratory investigations on water penetration in concrete made with coarse aggregates from demolishing waste are presented in this paper. Seven batches of standard size concrete cubes were cast with recycled aggregates from demolished concrete replacing coarse aggregates in percentages from 0% to 60%. The compressive strength of the samples was evaluated by non-destructive testing with the use of the Schimidz hammer. It was found that the strength reduces with an increase in recycled aggregate percentage. The maximum loss of strength due to the induction of recycled aggregates was 32% in the batch with 60%recycled aggregates. All samples were subject to constant water pressure of 5 bars for 72 hours. From the obtained results it was shown that the water penetration depth increases with increase in recycled aggregates rate. With 10% and 20% replacement the samples allowed less water to penetrate than conventional concrete samples, but 76% more penetration depth was recorded in samples with 60% replacement. Strength and water penetration results from dosages up to 20% show that the durability of the produced concrete allows it to be used in structural members with consideration of strength reduction in the design process. However, more water penetration with higher dosages of recycled aggregates needs proper care in design and usage of the concrete particularly for locations where concrete is exposed to water pressure.

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“…In spite of this, crushed aggregates are angular but every crushed aggregate does not have the same angularity [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Crushing Type of Concrete s on Mechanical Properties of Concrete

Öztürk¹,

Erdem²,

Kozanoglu³

2012

IJME

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In this study, determination of the effects of concrete aggregates on mechanical properties of concrete due to crushing type was investigated. For this purpose, mechanical properties of concrete mixtures such as strength and flow are determined by using aggregates crushed by two different types of crusher. Different types of concrete mixtures are prepared by using aggregates developed by vertically shafted (VS) and impact crushers (IC). Properties of concrete compounds such as water, cement are kept constant for each crushing type to determine the aggregate effect for concrete sets having different mixture rates. Four different types of concrete sets with two different aggregate types have been produced to prevent the predominant influences of concrete compounds except aggregate on mechanical properties. Thus, there was no mineral and chemical admixture used in the mix to obtain the nominative effect of aggregates produced with different crushing types, on strength and flow. Strength values for 7 and 28 days are obtained and comparisons have been made according to crushing type.

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Mechanical Properties and Permeability of Recycled Aggregate Concrete at Low Water/Binder Ratio

Cited by 4 publications

References 3 publications

Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres

Resistance to Chloride Penetration of Recycled Aggregate Concrete Modified Using Treated Coarse Recycled Concrete Aggregate and Fibres

Water Penetration of Concrete made with Coarse Aggregates from Demolishing Waste

Investigation of Crushing Type of Concrete s on Mechanical Properties of Concrete

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