Durability and water absorption properties of surface treated concretes

Basheer, Lulu; Cleland, David

doi:10.1617/s11527-010-9679-4

Cited by 33 publications

(9 citation statements)

References 4 publications

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“…The permeability index can be obtained from the curve of penetrated water versus time. The Autoclam test has been widely used to assess the permeability and other properties of normal concrete and surface treated concrete [ 15 – 17 ]. At the age of testing, concrete specimens were taken out, and dried in a fan assisted chamber which was maintained at 50 °C and <20% relative humidity for 1 week and then cooled overnight in ambient environment before permeability test.…”

Section: Methodsmentioning

confidence: 99%

“…At the age of testing, concrete specimens were taken out, and dried in a fan assisted chamber which was maintained at 50 °C and <20% relative humidity for 1 week and then cooled overnight in ambient environment before permeability test. This kind of pre-treatment can help to eliminate the error due to the variation of moisture between samples [ 17 ]. The effective test area, which was a circle with the diameter of 50 mm, was isolated on the surface of concrete specimen using a standard steel ring and the main body of Autoclam was connected to this ring.…”

Section: Methodsmentioning

confidence: 99%

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Study on Surface Permeability of Concrete under Immersion

et al. 2014

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In this paper, concrete specimens are immersed in ultrapure water, to study the evolutions of surface permeability, pore structure and paste microstructure following the prolonging of immersion period. According to the results, after 30-day immersion, the surface permeability of concrete becomes higher as compared with the value before immersion. However, further immersion makes the surface permeability decrease, so that the value measured after 150-day immersion is only half that measured after 30-day immersion. The early increase in surface permeability should be mainly attributed to the leaching of calcium hydroxide, while the later decrease to the refinement of pore structure due to hydration. The two effects work simultaneously and compete throughout the immersion period. The proposed mechanisms get support from microscopic measurements and observations.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Study on Surface Permeability of Concrete under Immersion

et al. 2014

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“…It was reported that incorporating Bacillus halodurans Strain KG1 in the concrete mix resulted in a decrease in the porosity and water absorption 12.4% and 20% at 91 days respectively (Kunal et al 2016), plus an obvious increase against water penetration and other hazardous materials was reported (Senthilkumar et al 2014). The studies also showed that Bacillus sphaericus addition to the concrete mix improves its strength against permeability as a result of bio deposition (Basheer and Cleland 2011;Basheer et al 1997). Another advantage of bio-remediated concrete is its capacity to resist chloride penetration which in turn decrease corrosion rate of reinforcement (Dai et al 2010;Ibrahim et al 1997;Medeiros and Helene 2009).…”

Section: Effect Of Bacteria On Concrete Criteriamentioning

confidence: 96%

Review: Microbial induced mineralization of calcium carbonate for self-healing concrete

Elkhateeb

Elnahas

Daba

2021

Asian J Nat Prod Biochem

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Abstract. Elkhateeb WA, Elnahas MO, Daba GM. 2021. Review: Microbial induced mineralization of calcium carbonate for self-Healing concrete. Asian J Nat Prod Biochem 19: 1-9. Low-cost solutions achieving concrete self-healing are attracting researchers attention. Generally, concrete self-healing mechanism has been so far accomplished by three approaches: autogenous healing, encapsulation of polymeric material, and microbial induced mineralization of calcium carbonate. Microbial approach seems like an attractive potent, relatively cheap way to achieve concrete self-healing. Hence, this review elucidates the microbial concrete self-healing mechanisms, and compare the roles of fungal and bacterial mediated self-healing concrete.

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“…In contrast, the addition of hydrophobic organic components seems more efficient as the pore interfaces inside the cement-based materials could be easily modified by small amounts of organic components, including silanes [ 13 , 14 , 15 ], polymers [ 16 , 17 , 18 , 19 ], long-chain fatty acid/salts [ 20 , 21 , 22 ] and so on. However, as these water-insoluble components are inclined to float and aggregate on the surface of cement slurry during the mixing, a heterogeneous matrix with uneven hydrophobic and mechanical properties will be formed [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

et al. 2023

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To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and demonstrated in cement paste system for improving the resistance to water absorption without significantly reducing 28-day compressive strength. Firstly, the dissolved PS-b-PAA was added into water, and it quickly self-assembled into amphiphilic 80 nm-sized micelles with hydrophobic polystyrene-based core and hydrophilic poly(acrylic acid)-based shell. The improved dispersion compared to that of polystyrene emulsion may minimize the inhibiting effects on strength development, as the effects of PS-b-PAA micelle as hydrophobic admixtures on rheological properties, compressive strength, water absorption, hydration process, and pore structure of 28-day cement pastes were subsequently investigated. In comparison with the control sample, the saturated water absorption amount of cement pastes with 0.4% PS-b-PAA was reduced by 20%, and the 28-day compressive strength was merely reduced by 2.5%. Besides, the significantly increased hydrophobicity instead of slightly decreased porosity of cement paste with PS-b-PAA may contribute more to the reduced water adsorption characteristics. The study based on prepared PS-b-PAA micelle suggested a promising alternative strategy for fabricating polystyrene-modified concrete with reduced water absorption and unaffected compressive strength.

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Durability and water absorption properties of surface treated concretes

Cited by 33 publications

References 4 publications

Study on Surface Permeability of Concrete under Immersion

Study on Surface Permeability of Concrete under Immersion

Review: Microbial induced mineralization of calcium carbonate for self-healing concrete

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

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