Porosity and liquid absorption of cement paste

Krus, Martin; Hansen, Kathleen A.; Künzel, Hartwig M.

doi:10.1007/bf02498561

Cited by 57 publications

(33 citation statements)

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“…In every case, the highest values are achieved by porosity determined based on water saturation (p WS ), and the lowest by that determined using mercury intrusion porosimetry (p MIP ). A similar difference in the open porosity assessed by the three methods used was found by the authors of [5].…”

Section: Test Resultssupporting

confidence: 82%

“…The characteristics of the hardened cement paste largely determine the characteristics of the concrete. For this reason, the characteristics of the paste, and particularly of its open porosity, is of interest to many researchers [1][2][3][4][5][6][7]. Many methods exist for assessing this porosity, but the methods customarily used are subject to many limitations and thus provide incomplete information.…”

Section: Introductionmentioning

confidence: 99%

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Open porosity of cement pastes and their gas permeability

Tracz

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This paper presents the results of extensive research work on the open porosity and gas permeability of cement pastes. Tests were conducted on cement pastes with different water/cement ratios and types of cement. The three most popular cements in Poland from the CEM I, CEM II and CEM III groups were tested after the pastes had been cured for 90 days in laboratory conditions. The scope of experiments included the assessment of open porosity determined using three different methods: comparing the bulk and specific densities, mercury intrusion porosimetry and saturating the material with water. In addition, this article contains an analysis of the porosity characteristics based on the distributions produced by porosimetry examinations. Gas permeability was determined using the modified RILEM-Cembureau laboratory method. The results of the completed test allowed a quantitative determination to be made of the impact of water-cement ratio and type of cement used on open porosity assessed by various methods, and the influence of these parameters on the gas permeability of the paste. The quantitative changes in the content of capillary pores and meso-pores in the cement pastes analysed are also presented.

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Section: Test Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Open porosity of cement pastes and their gas permeability

Tracz

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…Since grad(P) is the fluid pressure gradient caused by capillary absorption (or suction) (Fall and Samb 2007;Talor et al 1999;Krus et al 1997), the following equation can be obtained:…”

Section: Fluid Flow Modelmentioning

confidence: 99%

“…Thus, the results of the aforementioned study will not be applicable to many CPB structures. This is because in recent years, blended cements (PCI blended with mineral admixtures such as blast furnace slag (Slag) or fly ash (FA)) have been increasingly used as a binder in CPB (Krus et al 1997). Advantages that accompany the use of blended cement include savings in PC consumption (cost reduction of CPB) and improvement in durability and environmental performance of the CPB .…”

Section: Introductionmentioning

confidence: 98%

Coupled Modeling of Temperature Distribution and Evolution in Cemented Tailings Backfill Structures that Contain Mineral Admixtures

Fall

Cai

2012

Geotech Geol Eng

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Cemented paste backfill (CPB, a mixture of tailings, water and binder) is widely utilized to fill underground mine voids. To achieve a good, economical performance, one approach is to proportionally use mineral admixtures such as fly ash and slag as partial substitutes for Portland cement. Binder hydration is one of the most significant factors that can generate heat within hydrating CPB structures, which in turn, influences the mechanical and hydraulic properties of CPB, as well as the pore structure within CPB. However, the temperature evolution due to the hydration of Portland cement that contains fly ash or slag is different from that of hydration with solely Portland cement. Hence, in consideration of the heat generated by both binder hydration and transferred between CPB and its surrounding media, a numerical model is developed to predict and determine the temperature development within CPB that contains mineral admixtures. After that, data from field and laboratory studies are employed to validate the developed model. The validation results demonstrate a good consistency between the model and the field and laboratory studies. Consequently, the proposed model is applied to simulate and determine the temperature evolution with time via mineral admixtures, binder content, initial rock and CPB temperatures, stope geometry, backfilling rate, curing time and backfilling strategy. The obtained results will contribute to better designs and preparation of CPB mixtures, as well as predict the temperature distribution within CPB structures.

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“…Several methods are currently available for determining the pore structure of porous materials [5,6]. Most of them are invasive, as they involve sampling and an hydration -stop process, which affects the amount and the type of the hydrates present in the paste [7] and consequently the pore -space properties of the mixtures.…”

Section: Introductionmentioning

confidence: 99%