Reduction of concrete sorptivity with age through carbonation

Dias, W. P. S.

doi:10.1016/s0008-8846(00)00311-2

Cited by 150 publications

(45 citation statements)

References 8 publications

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“…For the non-sealed specimens of both OPC and CEM III/B, saturation readily occurred within 24 h over a thickness of 50 mm during the water absorption test, which is the maximum cover thickness for protection of the steel reinforcement according to the European standard (NEN-EN 1992-1-1). Greater potential for water absorption reduction was found for initially non-sealed specimens when compared to sealed specimens, which corresponds to literature [26]. However, compared to initially cured (sealed) specimens, the surface water absorption still appeared to increase.…”

Section: Discussionsupporting

confidence: 86%

Effect on Concrete Surface Water Absorption upon Addition of Lactate Derived Agent

Mors

Jonkers

2017

Coatings

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Water tightness of a concrete cover layer is important, as it is typically used as a protective coating of the steel reinforcement. Water tightness can be impaired by crack formation or by permeability. A bacteria-based lactate-derived healing agent (HA) can be added to concrete to enhance the potential for restoration of water tightness. Bacterial conversion of the included carbon source results in CO 2 production and subsequent CaCO 3 precipitation, similar to the mechanism of concrete carbonation. Carbonation is known to densify concrete, particularly when using ordinary Portland cement (OPC), but to a much lower extend in slag-based concrete (CEM III/B). To identify the effect of HA addition on concrete properties, this study focusses on the ingress of moisture in non-cracked concrete surfaces by assessing capillary water absorption. Surface properties were determined for sealed and unsealed surfaces of concrete-either based on OPC or CEM III/B-before and after curing under three different conditions: Dry, wet, or humid. HA addition to concrete containing slag cement generated a surface less prone to continued drying, but resulted in higher water absorption. In contrast, surface water absorption significantly decreased upon HA addition to OPC-based samples, independent of the curing regime. It is therefore concluded that HA in its current form is suitable for application in OPC, but less in CEM III/B-based mixtures.

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Section: Discussionsupporting

confidence: 86%

Effect on Concrete Surface Water Absorption upon Addition of Lactate Derived Agent

Mors

Jonkers

2017

Coatings

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“…They only make the cover concrete more impermeable. This observation is in agreement with the results reported by Dias [17]. He reported that surface sorptivities are lower than interior sorptivities.…”

Section: Effect Of Mk On Sorptivity Of Concretesupporting

confidence: 93%

“…Dias [17] studied the variation of concrete sorptivity with age through carbonation. Ordinary Portland cement (OPC) concrete specimens that had been air-dried for 3.5 years were found to have an increase in weight and reduction in sorptivity, with weight and sorptivity changes being greater for specimens with higher original sorptivity.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of metakaolin and foundry sand on the near surface characteristics of concrete

Siddique

Kadri

2011

Construction and Building Materials

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“…There already have been multiple studies published on the effect of carbonation on durability of OPC concrete, including chloride penetration resistance properties [12,13,15,19,28,45]. Carbonation of OPC concretes decreases the porosity and therefore increase the chloride penetration resistance.…”

Section: Significance Of the Studymentioning

confidence: 99%