Predicting the calcium leaching behavior of cement pastes in aggressive environments

Yang, Hu; Jiang, Linhua; Zhang, Yan; Qin, Pu; Xu, Yi

doi:10.1016/j.conbuildmat.2011.10.031

Cited by 105 publications

(52 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 5 shows the values of˜R c plotted as a function of A d /A t ratio for each type of paste investigated. As expected, loss of compressive strength increased with the leached ratio but, differing from other reported research (Carde et al, 1997;Yang et al, 2012), no straight line relationship between˜R c and A d /A t was found. Moreover, at a fixed A d /A t ratio, lower˜R c values were always determined for OPC-3 .…”

Section: Element Concentration Profiles In Solid-phase and Leached Shcontrasting

confidence: 39%

Leaching behaviour of cement pastes containing nanosilica

Berra

Carassiti

Mangialardi

et al. 2013

Advances in Cement Research

View full text Add to dashboard Cite

The influence of nanosilica (nanoscale-size particles of amorphous silica) on the leaching behaviour of Portland\ud cement pastes made with a relatively low water/binder ratio (w/b 0.36) and different nanosilica contents\ud (0–3.8 wt% of binder) was investigated through the use of an ultra-accelerated leaching test (using concentrated\ud ammonium nitrate solution as a leachant) coupled with scanning electron microscopy-energy dispersive spectroscopy\ud and differential scanning calorimetry-thermogravimetric analyses. The effect of leaching on the physical and\ud mechanical properties of such pastes was assessed and their chemical resistance to leaching was evaluated through a\ud parametric model. It was found that the addition of nanosilica improves the chemical resistance of cement pastes by\ud producing a significant leaching deceleration (up to 69%). As a result, the decay of compressive strength of leached\ud specimens (about 60% reduction) is significantly retarded. Higher residual compressive strengths were also obtained\ud for totally leached specimens containing nanosilica, as a result of the ability of this admixture to consume portlandite\ud during cement hydration and then reduce the porosity associated with portlandite dissolution during leaching

show abstract

Section: Element Concentration Profiles In Solid-phase and Leached Shcontrasting

confidence: 39%

Leaching behaviour of cement pastes containing nanosilica

Berra

Carassiti

Mangialardi

et al. 2013

Advances in Cement Research

View full text Add to dashboard Cite

show abstract

“…However, only a few studies discuss microstructural alterations after leaching [14,15], typically leading to a material with coarser microstructure in case of accelerated leaching in ammonium nitrate solution, and the effects of leaching on transport properties [16,17]. However, to what extent the microstructure and transport properties are modified is still questionable.…”

Section: Introductionmentioning

confidence: 95%

Investigation of the changes in microstructure and transport properties of leached cement pastes accounting for mix composition

Phung

Maes

Jacques

et al. 2016

Cement and Concrete Research

111

View full text Add to dashboard Cite

“…Besides that, the contact with pure water creates concentration gradients between the interstitial solution and the aggressive environment, as a result of which some ions in the pore solution diffuse outwards into the aggressive solution [36]. Leaching significantly reduces the compressive strength and stiffness of cement pastes [37].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…The compressive strength of AAC with 3% CMS is decreased by 28.95% and 65.28%, respectively, after 200 °C-heated and immersed in water for 2 h and 24 h. After being heated, the cements were immersed in water for 2 h and 24 h. The impregnation of water leads to some components of the cement dissolving. Besides that, the contact with pure water creates concentration gradients between the interstitial solution and the aggressive environment, as a result of which some ions in the pore solution diffuse outwards into the aggressive solution [36]. Leaching significantly reduces the compressive strength and stiffness of cement pastes [37].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…Koo [38] has reported that the cumulative leach index shows an increasing trend as the water immersion time increases; the decreasing in compressive strength of the cement with an immersion time of 90 days was 58% of the compressive strength of the cement without immersion. Yang [36] tried to predict the calcium leaching behavior of cement pastes in aggressive environments, and reported that at the early period of leaching, a small increase in leaching durations corresponds to a large increase in strength loss. Figure 5 shows XRD patterns of 85 • C-cured (a) and 200 • C-heated (b) specimens of control and AAC with 3% starches.…”

Section: Compressive Strengthmentioning

confidence: 99%

See 1 more Smart Citation

A Study on the Effects of Starches on the Properties of Alkali-Activated Cement and the Potential of Starch as a Self-Degradable Additive

Tan¹,

Zheng²,

Ma³

et al. 2017

Energies

View full text Add to dashboard Cite

An urgent problem of geothermal energy source development is how to cut down the production costs. The use of temporary sealing materials can reduce the costs associated with the circulation lost by plugging, and increase the production by self-degradation. Based on the utilization of starches as self-degradable additives in the medical field, this paper investigated the effects of three kinds of starches, namely corn starch (CS), hydroxypropyl starch (HPS) and carboxymethyl starch (CMS) on the properties of alkali-activated cement (AAC). In addition, the thermal properties of starch, the compressive strength and microstructures of the cement with starch were tested, to evaluate the potentiality of starch as self-degradable additive for geothermal cement. The analysis showed that: (1) all the starches have the effect of increasing the apparent viscosity, prolonging the setting time and reducing the static fluid loss of alkali-activated cement; (2) the addition of starch increased the number of pores in 200 • C-heated cement, facilitated the leaching process, and thus promoted the self-degradation; and (3) among the three starches, CMS has the most potential as a self-degradable additive.

show abstract

Predicting the calcium leaching behavior of cement pastes in aggressive environments

Cited by 105 publications

References 20 publications

Leaching behaviour of cement pastes containing nanosilica

Leaching behaviour of cement pastes containing nanosilica

Investigation of the changes in microstructure and transport properties of leached cement pastes accounting for mix composition

A Study on the Effects of Starches on the Properties of Alkali-Activated Cement and the Potential of Starch as a Self-Degradable Additive

Contact Info

Product

Resources

About