Water sorptivity of mortars and concretes: a review

Hall, Christopher

doi:10.1680/macr.1989.41.147.51

Cited by 695 publications

(338 citation statements)

References 2 publications

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“…Water absorption also accelerates the deterioration of concrete due to freezing and thawing (Fagerlund 1975;Litvan 1988;Bentz et al 2001;Li et al 2011), and alkali silica reactions (Swamy 1998). The absorptivity or permeability of concrete has been extensively studied (Hall 1989). The data in these studies indicate that the water-to-binder ratio (W/B) and the curing condition or the preconditioning of the concrete specimens govern the sorptivity (Parrott 1992;Zhang and Zong 2014).…”

Section: Introductionmentioning

confidence: 99%

Relationship Among the Permeation Rate of Water into Concrete, the Mix Design, Curing, and the Degree of Drying

Sakai

Yokoyama

Kishi

2017

ACT

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Water permeation into concrete causes various types of deterioration in concrete structures such as rebar corrosion, frost damage, ASR, etc.; however, the evaluation of the water permeation rate is difficult. This paper proposes a simple equation to evaluate the water permeation rate into concrete, based on basic information such as the mix design, curing condition, and degree of drying. Concrete specimens are cast, cut into slices of different thicknesses, and the time taken for water penetration is measured. The permeation rate is calculated from the relationship between the obtained permeation time and the slice thickness. Additionally, a literature survey is conducted to collect the water permeation rate in various types of concrete. A prediction equation for the water permeation rate is proposed, based on the data. Although this data contains various types of concrete with/without the admixture material, different water-to-binder ratios, and different curing conditions, all the calculated values fall within a range of ±150% of the data from literature.

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Section: Introductionmentioning

confidence: 99%

Relationship Among the Permeation Rate of Water into Concrete, the Mix Design, Curing, and the Degree of Drying

Sakai

Yokoyama

Kishi

2017

ACT

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“…They were mixed in dry condition for two minutes, and for another three minutes after adding the water. Cubes of 100 mm edge for compressive strength tests, cubes with 200 × 50 × 50 mm edges for flexural strength and cylinders with the diameter of 150 mm and the height of 300 mm replaces part of the cementitious material but does not contribute to strength 48 . Also, it may be due to the defects generated in dispersion of nanoparticles that causes weak zones.…”

Section: Methodsmentioning

confidence: 99%

The Effects of ZnO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

Nazari

Riahi

2011

Mat. Res.

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In this study, the effect of limewater on strength assessments and percentage of water absorption of concrete incorporating ZnO 2 nanoparticles has been investigated. Portland cement was partially replaced by ZnO 2 nanoparticles with the average particle size of 15 nm and the specimens were cured in water and saturated limewater for specific ages. The results indicate that ZnO 2 nanoparticles up to 2.0 weight percent could produce concrete with improved strength and water permeability when the specimens cured in saturated limewater while this content is 1.0 weight percent for the specimens cured in tap water. Although the limewater reduces the strength of concrete without nanoparticles when compared with the specimens cured in water, curing the specimens bearing ZnO 2 nanoparticles in saturated limewater results in more strengthening gel formation around nanoparticles causes improved permeability together with high strength. In addition, ZnO 2 nanoparticles are able to act as nanofillers and recover the pore structure of the specimens by decreasing harmful pores. Accelerated peak appearance in conduction calorimetry tests, more weight loss in thermogravimetric analysis and more rapid appearance of peaks related to hydrated products in X-ray diffraction results, all indicate that ZnO 2 nanoparticles could improve mechanical and physical properties of the specimens.

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“…All surfaces around the chosen surface were then greased to about 2 cm .The weights of the specimens were measured after removing the surface water at periods of 15 minutes up to 2 hours. The total amount of water absorbed was then monitored .The sorptivity of the tested specimens was calculated using the following equation [8 ]: i= A+ s t 0.5 …….…”

Section: 12testingmentioning

confidence: 99%

Impact of water hyacinth on properties of concrete made with various gravel to dolomite ratios

Shaban¹,

Abdel²

2015

Third International Conference on Advances in Civil, Structural and Mechanical Engineering- CSM 2015

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-Water hyacinth(W-H) has an adverse effect on Nile river in Egypt , it absorb a high quantities of water, it is need to serve the quantities arrived ( 55500 million m 3 ) especially in this time, so by burning W-H it can used in concrete mix to reduce the permeability of concrete. In this study, the effect of W-H on concrete properties ( freshhardened) were studied, slump of concrete as a fresh properties, compressive strength, splitting tensile strength as mechanical properties, mass transport by Isat , microstructure by XRD and thermal gravimetric analysis (TGA). This paper presents a study on the properties of concrete prepared with two aggregate types, namely gravel and dolomite. Various concrete mixes made with gravel and dolomite which blended with proportions 1:0,0:1,1:1,1:2 and 2:1, respectively with different W-H ratios of 0,0.5,1.0 ,2.0 and 5.0% by mass of cement at w∕c 0.50 for different mixes. The results showed that mechanical properties of concrete developed at 2% W-H for different gravel/ dolomite ratios and mass transport properties of concrete enhanced at this ratio of W-H.

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Water sorptivity of mortars and concretes: a review

Cited by 695 publications

References 2 publications

Relationship Among the Permeation Rate of Water into Concrete, the Mix Design, Curing, and the Degree of Drying

Relationship Among the Permeation Rate of Water into Concrete, the Mix Design, Curing, and the Degree of Drying

The Effects of ZnO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

Impact of water hyacinth on properties of concrete made with various gravel to dolomite ratios

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