Effect of limestone fillers on microstructure and permeability due to carbonation of cement pastes under controlled CO 2 pressure conditions

Phung, Quoc Tri; Maes, N.; Jacques, Diederik; Bruneel, Els; Driessche, Isabel Van; Ye, Guang; Schutter, Geert De

doi:10.1016/j.conbuildmat.2015.02.093

Cited by 129 publications

(44 citation statements)

References 46 publications

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“…However, water can fill the pores and prevent CO 2 gas penetrating into the fiber-cement pore network. In fact, carbonation reaches the highest efficiency at an internal relative humidity close to 60-70% [9], which could never be reached in our case because it requires a much higher rolling pressure that may induce cracks in the composites as discussed above. Therefore, the samples should have low water content but remain uncracked and have a reasonable pore volume to optimize the carbonation process.…”

Section: Relationship Between Modulus Of Elasticity Toughness and Apmentioning

confidence: 92%

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Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

et al. 2018

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This paper presents the outcome of a comprehensive experimental program undertaken to study the performance of cellulose pulp and synthetic PVA (polyvinyl alcohol) based fiber-cement composite under both carbonated and non-carbonated curing conditions at early age. The composites were produced at different rolling pressures (2.5 to 9.0 bar) and subjected to various curing conditions in which the effects of CO 2 pressure (1 to 3 bar) and curing time (3 to 9 h) were studied. The mechanical properties (modulus of elasticity (MOE), modulus of rupture (MOR), and toughness), as well as the physical properties (porosity, bulk density, and water absorption), were measured for all samples. Scanning electron microscopy (SEM) was used to investigate the effect of carbonation on porosity change and adhesion of fiber-matrix. A parametric investigation of the effects of the carbonation curing period, CO 2 pressure, and rolling pressure on the improvement of the physical and mechanical properties during carbonation curing was performed. Results showed that fiber-cement composites cured with an elevated CO 2 pressure of 3 bar, rolling pressure of 3 bar, and 5 h of curing time provided optimal curing conditions resulting in the most desirable mechanical and physical properties. However, toughness was greatly reduced with the increase of the CO 2 pressure, curing time, and rolling pressure. Additionally, the carbonation curing improved the bonding between the fiber and the cement matrix because of the precipitation of calcite particularly in the pores of the interfacial transition zone (ITZ) between the cement matrix and the fibers.

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Section: Relationship Between Modulus Of Elasticity Toughness and Apmentioning

confidence: 92%

“…This filler was used for partial substitution of Portland cement to reduce the cement consumption, hydration heat, and promote particle packing resulting in a robust dimensional stability [31]. Furthermore, limestone filler also acts as a nucleation side for calcium carbonate precipitation which enhances the carbonation degree [9].…”

Section: Fibermentioning

confidence: 99%

Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

et al. 2018

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“…From a mineralogical point of view, Ca-leaching mainly affects portlandite, but several studies show also important decalcification of the C-S-H phases, especially in long-lasting leaching experiments [5,21]. As fillers in general, and also limestone fillers, specifically influence processes as carbonation [22], microstructure [23], hydration [24,25], and mechanical properties [26,27], it is expected that they also have an effect on Ca-leaching of cementitious materials. However, information is still missing in the literature.…”

Section: Introductionmentioning

confidence: 97%

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

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“…Aggressive agents like chloride ions, sulphate ions, oxygen, and carbon dioxide can enter into concrete through some transmission channels, such as pores and micro cracks, to induce the corrosion of hardened cement paste and/or steel in cement structures. Therefore, the service life and durability of concrete structures strongly depends on the permeability of concrete .…”

Section: Introductionmentioning

confidence: 99%

Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Zhang

Zuo

Yang

et al. 2019

Structural Concrete

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This study presents an experimental investigation in the effect of cementitious capillary crystalline waterproofing (CCCW) coating on the gas permeability of mortar and the mechanism how the gas permeability is affected. The gas permeability coefficient of mortar coated with or without CCCW material was measured through modified Cembureau method. The pore structure, micromorphology and hydration products of cement paste with or without CCCW coating were analyzed by the means of mercury intrusion porosimetry (MIP), scanning electron microscopyenergy disperse spectroscopy (SEM-EDS), X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry (TG-DSC). The results showed that under the effect of CCCW coating, the gas permeability of mortar got decreased and the pore structure changed towards smaller pore sizes. SEM-EDS results exhibited that there was a large amount of ettringite filling in the pores in the paste with CCCW coating. XRD and TG-DSC analysis indicated that there was more calcium carbonate formed in the paste with CCCW coating than blank paste. The formation of ettringite in pores and increased calcium carbonate production refines the pore size distribution and densifies the cement matrix, which induces the decrease in gas permeability of mortar coated with CCCW material. K E Y W O R D SCaCO 3 , cementitious capillary crystalline waterproofing material, ettringite, gas permeability, hydration products, microstructure

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Effect of limestone fillers on microstructure and permeability due to carbonation of cement pastes under controlled CO 2 pressure conditions

Cited by 129 publications

References 46 publications

Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

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

Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

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