A through solution model for volume changes of cement hydration

Paulini, P.

doi:10.1016/0008-8846(94)90137-6

Cited by 13 publications

(9 citation statements)

References 3 publications

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“…When milled MSWI BA was used without additional additives or the addition of milled quartz sand, microsilica, or metakaolin, the changes in the volume of the samples were similar, with an increase of 11–12% after 10 h. The most intense changes in the volume of cement paste occurred in the first 300 min after mixing. Meanwhile, the volumes of the cement pastes with SP (without microfillers) were reduced by approximately 1% after 10 h. P. Paulini [ 43 ] used a similar method for the evaluation of cement shrinkage and established that such a method was appropriate to analyze the efficiency of additives in cement paste, especially for the initial reaction period, and determined that the volume of cement samples without special additives decreased.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Milled Municipal Solid Waste Incineration Bottom Ash on Cement Hydration and Mortar Properties

2023

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Large amounts of municipal solid waste incineration bottom ash (MSWI BA) are formed worldwide, and this quantity is growing because of the establishment of new waste-to-energy plants. This waste is generally kept in landfills but can be used for the manufacturing of cementitious building materials. This article analyzes the use of MSWI BA as a microfiller in cement mortars. The effects of MSWI BA on the properties of cement binder and mortar were analyzed by using them separately or in combination with other microfillers: milled quartz sand, metakaolin, milled glass, and microsilica. This article investigates the flowability of cement-based mixtures, the volume change as a result of the evolution of hydrogen gas, cement hydration, XRD, TG, the physical and mechanical properties of the mortar samples, and leaching. The addition of milled MSWI BA in cement mortars was found to significantly increase slump flow; therefore, MSWI BA can be used as a microfiller. The addition of metakaolin changed the kinetics of H2, which evolved due to the reaction between Al and alkali, and had a positive effect on the mechanical properties of cement mortar.

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Section: Resultsmentioning

confidence: 99%

The Effect of Milled Municipal Solid Waste Incineration Bottom Ash on Cement Hydration and Mortar Properties

2023

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“…. Clinker minerals Hydration heat Chemical shrinkage by Paulini [8] Chemical shrinkage by Yodsudjai and Wang [9] [kJ/kg] stresses. The reduction of cast concrete mass is an efficient approach for the reduction of maximal temperature; in addition, the casted structure is divided into fractional segments and the casting is realized as a "checkerboard".…”

Section: No /mentioning

confidence: 99%

“…An even more detailed explanation was provided by Bullard et al [7], who described the behaviour of individual clinker materials and their interaction with each other. The volume changes of the cement were thoroughly studied by Paulini [8], who quantified the volume changes for individual clinker minerals, which are shown in Table 1. However, Yodsudjai and Wang [9] reported different values.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage of Various Types of Portland Clinker-Based Cements With Respect to Their Hydration Degree

Davidová

Reiterman

2020

Acta Polytech

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The volume changes of cement based composites are significantly exhibited in the hardening process. Initial phases of the hardening are complemented by the expansion due to the heat evolution that is subsequently alternated by the shrinkage. Both could cause a crack initiation. It is evident that ultimate volume changes of cement based composites are a complex process, because the final shrinkage is determined by the binder used, exposition and also by the previous history. The paper focuses on the evaluation of the main types of cements based on the Portland clinker by using a conventional procedure for the determination of the shrinkage on the standard cements mortars. These mortars were exposed to drying after 1 and 3 days of curing, related to the actual degree of hydration, which was estimated on the basis of compressive strength development. The hydration process was additionally monitored using thermogravimetry on the accompanying paste specimens during one year. The performed experimental program confirmed the essential sense of the curing regime especially for blended cement systems, which exhibited very low values of the hydration degree at applied curing intervals. Despite the slightly higher values of shrinkage of blended cements, the obtained results signalize the crucial effect of prolonged curing for these types of binders. The conclusion highlighted the necessity of taking into consideration the hydration degree during cement testing by using the conventional contact method. Otherwise, the simple interpretation leads to an overestimation of the less-suitable material solution.

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“…This reduces the size and interconnectivity of the voids, which will be occupied by cement gels. Thus, the geometry of the ultimately formed system of pores and capillaries depends strongly on the changes of volume of the cement hydration products [16].…”

Section: Hydraulic Conductivitymentioning

confidence: 99%

A Talc-Based Cement-Poor Concrete for Sealing Boreholes in Rock

Pusch¹,

Warr²,

Grathoff³

et al. 2013

ENG

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Deep investigation boreholes in crystalline rock for site selection of repositories for high-level radioactive waste are proposed to be sealed by installing a series of dense concrete and clay plugs. These should prevent radionuclides from leaking canisters at depth to migrate to the biosphere through the holes. The concrete seals will be installed where the holes intersect water-bearing fracture zones to serve as stable and low-permeable supports for adjacent clay plugs. Low porosity and microstructural stability must be guaranteed for many thousands of years and ordinary Portland cement with organic superplastizer will not fulfill the requirements since the high pH will cause degradation of contacting clay and the organic additive can produce colloids with a capacity to carry radionuclides up to the biosphere. Very cement-poor concrete (<8%) based on low-pH cement and with talc as plasticizer is an option but it matures more slowly, which requires that the construction of seals is made so that sufficient bearing capacity for carrying overlying clay seals is reached.

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A through solution model for volume changes of cement hydration

Cited by 13 publications

References 3 publications

The Effect of Milled Municipal Solid Waste Incineration Bottom Ash on Cement Hydration and Mortar Properties

The Effect of Milled Municipal Solid Waste Incineration Bottom Ash on Cement Hydration and Mortar Properties

Shrinkage of Various Types of Portland Clinker-Based Cements With Respect to Their Hydration Degree

A Talc-Based Cement-Poor Concrete for Sealing Boreholes in Rock

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