Assessment of early-age autogenous shrinkage strains in concrete using bentonite clay as internal curing technique

Afzal, Salman; Shahzada, Khan; Fahad, Muhammad; Saeed, Salman; Ashraf, Muhammad

doi:10.1016/j.conbuildmat.2014.05.051

Cited by 52 publications

(20 citation statements)

References 10 publications

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“…Afzal et al [48] stated that the use of bentonite reduces the linear shrinkage of high strength concrete. Bentonite clay was used as 5%, 10%, 15% and 20% replacement of cement.…”

Section: Nano-claymentioning

confidence: 98%

Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

Polat

Demirboğa

Khushefati

2015

Construction and Building Materials

126

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“…Afzal et al [48] stated that the use of bentonite reduces the linear shrinkage of high strength concrete. Bentonite clay was used as 5%, 10%, 15% and 20% replacement of cement.…”

Section: Nano-claymentioning

confidence: 98%

Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

Polat

Demirboğa

Khushefati

2015

Construction and Building Materials

126

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“…General requirements for internal curing materials of cement-based materials include: 1) thermodynamic availability requires the water to have an activity close to one, in other words an equilibrium RH close to 100%; and 2)kinetic availability refers to the transport of water from the reservoir to all parts of the self-desiccating cementitious material [19]. Several materials can be used for internal curing of cement-based materials, including LECA (lightweight expanded clay) [11,[20][21][22][23], Pumice [24,25], expanded shale [7], zeolite [21], perlite [26], cenospheres [15], SAP [27], recycled aggregate [28], wood-derived powders and fibers [29], rice husk ash (RHA) [30], coal bottom ash [31], bio-LWA [32], and bentonite clay [33]. Among these materials, SAP and LWA are the most commonly used because they are inexpensive due to abundant supplies, and other materials, such as RHA, coal bottom ash and bentonite clay, were found with the function of internal curing recently.…”

Section: Internal Curing Materialsmentioning

confidence: 99%

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

Liu

Shi

et al. 2017

Construction and Building Materials

211

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High performance cement-based materials, such as high or ultra-high performance concrete (HPC or UHPC) have been widely used and still faces the risk of cracking caused by shrinkages, especially autogenous shrinkage. Internal curing is an effective method to reduce or even eliminate autogenous shrinkage and has effects on chemical shrinkage, dry shrinkage, etc. The commonly used internal curing materials include super-absorbent polymer (SAP) and porous materials. Porous materials refer to lightweight aggregate (LWA) and porous superfine powders. In this paper, the internal curing materials has been divided into two categories based on water absorbing mechanism. The effects of these two categories of internal curing materials on shrinkage of high performance cement-based materials are reviewed. The addition of internal curing materials releases internal curing water, postpones the drop of internal RH, and reduces autogenous shrinkage, but increase chemical shrinkage. The addition of internal curing materials with extra water increases drying shrinkage. The mechanisms of shrinkage on internal curing are also summarized and discussed. However, those mechanisms only focus on certain type of shrinkage. To reduce the risk of cracking more effectively, the relationship of different type of shrinkages should be established.

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“…6 at a concentration of 0.003 mol L -1 . The test tubes were stirred for 1,5,10,20,30,60, and 90 min.…”

Section: Adsorption By Bath Methodsmentioning

confidence: 99%

“…Bentonite presents other properties such as very low permeability and high cation exchange capacity, which are important in the area of environmental engineering and these properties render the clay a barrier to heavy metal contaminants. 1 Several works have reported on clay modification and on clay adsorption capacity for environmental use as adsorbents. [2][3][4][5][6][7][8][9][10][11][12] In addition, clay materials can undergo intercalation reactions and/or functionalization of its interlayers and/or surface area, to afford hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Materials Based on Bentonite Functionalized with Amine Groups via the Hydrolytic Sol-Gel Method

Gilberto¹,

Marçal²,

Silva³

et al. 2015

Journal of the Brazilian Chemical Society

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Bentonite is a natural clay that presents characteristics such as good capacity to exchange cations, large specific surface area, large porosity, and possibility to undergo intercalation and/or functionalization. This work reports on bentonite functionalization with organomodified alkoxides. Functionalization afforded hybrid materials displaying desirable properties for adsorption of chromium trivalent ions. Infrared absorption spectroscopy, X-ray powder diffraction, thermal analysis, specific surface area analysis, and adsorption experiments with methylene blue helped to characterize the materials and evaluate their cationic exchange capability. These techniques evidenced functionalization of the Brazilian bentonite. Kinetic and equilibrium experiments on the adsorption of chromium trivalent ions aided determination of the equilibrium time of kinetic adsorption isotherms and revealed whether the functionalized matrices adsorbed chromium trivalent ions. Chromium displayed S1 type adsorption isotherms, which confirmed that adsorption capacity originated from cooperative forces between the adsorbate and the hybrid adsorbents.

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Assessment of early-age autogenous shrinkage strains in concrete using bentonite clay as internal curing technique

Cited by 52 publications

References 10 publications

Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

Effects of nano and micro size of CaO and MgO, nano-clay and expanded perlite aggregate on the autogenous shrinkage of mortar

An overview on the effect of internal curing on shrinkage of high performance cement-based materials

Hybrid Materials Based on Bentonite Functionalized with Amine Groups via the Hydrolytic Sol-Gel Method

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