Effects of carbonation and leaching on porosity in cement-bound waste

Gerven, Tom Van; Cornelis, Geert; Vandoren, E.; Vandecasteele, Carlo

doi:10.1016/j.wasman.2006.05.008

Cited by 59 publications

(22 citation statements)

References 25 publications

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“…Most of the metal (e.g. lead, cadmium) has the lowest solubility at a pH between 8 and 10 . The results of some studies have shown also increasing in leaching of lead, arsenic, cobalt, zinc, cadmium, or molybdenum as carbonation result (which lowers the pH of the cement composites).…”

Section: Resultsmentioning

confidence: 99%

Disposal of bottom ash from the incineration of hazardous waste in two different mineral matrixes

Rożek

Król

Knapik

et al. 2017

Env Prog and Sustain Energy

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In this study four incineration residues (bottom ash), classified as hazardous wastes on the basis of a leaching test, have been investigated. Analysis of the chemical composition proved to have high contents of heavy metals that during storage could potentially be released into the environment. Therefore, the waste has been subjected to solidification/stabilization (i.e., one of the methods of immobilization of heavy metals) in two ways: with Portland cement and alkali‐activated granulated blast furnace slag. It was assumed that bottom ashes will constitute 30% by weight of the dry ingredients. It has been found that although the amount of heavy metals introduced into a matrix along with the mineral waste is significant, the increase in elution of heavy metal ions in the environment is not a consequence. The use of bottom ash from the incineration of hazardous waste may even limit the release of heavy metal ions from cementitious materials. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1074–1082, 2017

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Section: Resultsmentioning

confidence: 99%

Disposal of bottom ash from the incineration of hazardous waste in two different mineral matrixes

Rożek

Król

Knapik

et al. 2017

Env Prog and Sustain Energy

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“…For the 0% mud contaminated cement, the reduction in density and increase in porosity were caused by the leaching of Ca(OH) 2 as leaching has been shown to reduce porosity in cement 81 . The exchange of ions between the cement pore solution and the flowing brine results in the dissolution of Ca(OH) 2 and subsequent transport of Ca 2+ ions out of the cement.…”

Section: Porosity Increasementioning

confidence: 99%

Experimental Study of the Impact of Drilling Fluid Contamination on the Integrity of Cement-Formation Interface

Agbasimalo

Radonjic

2012

Volume 6: Materials Technology; Polar and Arctic Sciences and Technology; Petroleum Technology Symposium

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Primary cementing is performed during drilling and completion of wells mainly to provide zonal isolation. Ideally, 100% drilling fluid displacement should be achieved during cementing. This is difficult to achieve and some mud is left on the wellbore walls. This study investigates the effect of the undisplaced mud on the integrity of the cement-formation interface. Flow-through experiments were conducted at 14.48 MPa (2100 psi) overburden pressure and temperature of 22° C (72° F) with cement-sandstone composite cores and brine at a flow rate of 1 ml/min. The cement-sandstone composite cores had 0% and 10% drilling mud contamination respectively. Variations in the permeability of the composite cores were recorded throughout the flow-through experiments by measuring the pressure drop across the composite cores. The composite cores were characterized before and after the flow-through experiments to delineate the alterations in the composite cores due to the flow-through experiments. Higher pH values were observed in the effluent brine from the 10% mud contaminated core than the 0% mud contaminated core due to increased dissolution of cement. Microtomography revealed higher porosity at the interface zone of the 10% mud contaminated core. These show that mud contamination has a deleterious effect on the cement-sandstone interface and may create pathways for inter-zonal communication.

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“…During the curing time the samples were subjected to carbonation, which could clog the pores of the surface of sample. According to the experiments on the effect of carbonation on porosity (Thiéry et al, 2011;Van Gerven et al, 2007), carbonation could decrease the average porosity of mortar by more than 15%. In some extreme cases, the pores of surface could be clogged (Shen, 2012).…”

Section: Effect Of Carbonated Layermentioning

confidence: 99%

Degradation modeling of concrete submitted to biogenic acid attack

Yuan

Dangla

Chatellier³

et al. 2015

Cement and Concrete Research

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Biodeterioration of concrete,which is very common in sewer system, results in significant structure degradation. The process can be described by the 3 following steps: Concrete surface neutralization providing appropriate environment for sulfur oxidizing bacteria (SOB) to grow, sulfuric acid (H2SO4) production by SOB on concrete surface and chemical reaction between H2SO4 and cement hydration products. A reactive transport model is proposed to simulate the whole biodeterioration processes of concrete in contact with H2S gas and SOB. This model aims at solving simultaneously transport and biochemistry/chemistry in biofilm and concrete by a global coupled approach. To simulate the neutralization process, the absorption of H2S gas, the dissolution of portlandite (CH), the decalcification of calcium silicate hydrates (C-S-H) and the precipitation of calcium sulfide (CaS) are considered. To obtain the amount of biogenic acid, the production rate of H2SO4 by SOB is calculated via a set of simplified models governed by pH. Coupling with the modeling of H2SO4 degradation process, the biodeterioration depth and the solid composition evolution could be predicted. A laboratory experiment reported in literature is simulated and the simulation results are compared with experimental results

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Effects of carbonation and leaching on porosity in cement-bound waste

Cited by 59 publications

References 25 publications

Disposal of bottom ash from the incineration of hazardous waste in two different mineral matrixes

Disposal of bottom ash from the incineration of hazardous waste in two different mineral matrixes

Experimental Study of the Impact of Drilling Fluid Contamination on the Integrity of Cement-Formation Interface

Degradation modeling of concrete submitted to biogenic acid attack

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