Effect of the leaching of calcium hydroxide from cement paste on mechanical and physical properties

Carde, Christophe; François, Raoul

doi:10.1016/s0008-8846(97)00042-2

Cited by 227 publications

(112 citation statements)

References 2 publications

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“…As the degradation time increases there is only an increase in the degraded depth. This fact is in agreement with the information published by other authors (32) and is related with the volume vacated by leached portlandite. It can be expected some porosity increase related with the decalcification of CSH, but this kind of porosity can not be measured with the techniques employed in this work.…”

Section: Porous Microstructure Changessupporting

confidence: 93%

Estudio del proceso de descalcificación en morteros degradados en NH4NO3 empleando técnicas ultrasónicas

Pérez¹,

Moragues²,

Macphee³

et al. 2009

Mater. construcc.

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Section: Porous Microstructure Changessupporting

confidence: 93%

Estudio del proceso de descalcificación en morteros degradados en NH4NO3 empleando técnicas ultrasónicas

Pérez¹,

Moragues²,

Macphee³

et al. 2009

Mater. construcc.

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“…The calcium hydroxide has been attacked by the silage effluent causing dissolution and leaching of calcium into the silage effluent solution. The dissolution of calcium hydroxide results in an increased porosity and contributes to a decrease in compressive strength [50].…”

Section: Mass Lossmentioning

confidence: 99%

Resistance of geopolymer and Portland cement based systems to silage effluent attack

Aiken

Sha

Kwasny

et al. 2017

Cement and Concrete Research

109

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Abstract:Traditional Portland cement (PC) concrete has been used for many years in the agricultural industry for the construction of silos and silage effluent storage facilities. However, the acidic nature of the silage effluent produced by silage has led to severe degradation of PC concrete which in turn has significant environmental and financial implications. This study compares the resistance of PC and geopolymer (GP) mortars and pastes to silage effluent over 12 months. The GP samples displayed increased resistance to silage effluent in terms of mass and strength loss. Analysis of microstructure suggests that the increased stability of the reaction products is the main factor behind increased silage effluent resistance when compared with PC. It was also found that pulverised fuel ash (PFA) and ground granulated blast furnace slag (GGBS) blends with a higher PFA content may offer increased long term silage effluent resistance due to the nature of the main binder gel produced in PFA dominant systems.

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“…The loss of strength due to the leaching of calcium was reported by Carde and François (1997) and Heukamp et al (2001). Since the crack velocity in HSULPC increased with increasing temperature only in water, it is considered that subcritical crack growth in HSULPC happens due to leaching of calcium at the crack tip.…”

Section: Discussionmentioning

confidence: 64%

Subcritical crack growth and long-term strength in rock and cementitious material

Nara

Takada

Mori³

et al. 2010

Int J Fract

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High-strength and ultra low-permeability concrete (HSULPC) is a strong candidate for a radioactive waste package containing transuranic radionuclides (TRU waste) for geological disposal. Knowledge of the time-dependent fracturing of HSULPC and surrounding rock mass is essential to assess the long-term stability of such underground repositories. We have measured crack velocity in andesite and HSULPC both in air and water to examine subcritical crack growth by the Double-Torsion method. In air, the crack velocity in andesite increased when the temperature and relative humidity increased. On the other hand, the temperature and relative humidity had little effect on the crack velocity in HSULPC in air. In water, the crack velocity increased when the temperature was higher for both andesite and HSULPC. Using these experimental results, the longterm strength was estimated. It was shown that the long-term strength of HSULPC was higher than that of andesite. In air, the long-term strength for andesite was affected by the temperature and relative humidity. The long-term strength for andesite decreased when the temperature or relative humidity increased. For HSULPC, the change of the long-term strength with varying temperature or relative humidity was smaller than andesite in air. In water, the long-term strength for both materials decreased with increasing the temperature. Comparing the longterm strength of andesite and HSULPC at the same environmental conditions, it was recognized that the decrease of the long-term strength of HSULPC is smaller than that of andesite. The long-term strength in water was smaller than that in air for both materials.

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Effect of the leaching of calcium hydroxide from cement paste on mechanical and physical properties

Cited by 227 publications

References 2 publications

Estudio del proceso de descalcificación en morteros degradados en NH<sub>4</sub>NO<sub>3</sub> empleando técnicas ultrasónicas

Estudio del proceso de descalcificación en morteros degradados en NH<sub>4</sub>NO<sub>3</sub> empleando técnicas ultrasónicas

Resistance of geopolymer and Portland cement based systems to silage effluent attack

Subcritical crack growth and long-term strength in rock and cementitious material

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