Porosimetric, Thermal and Strength Tests of Aerated and Nonaerated Concretes

Strzałkowski, Jarosław; Garbalińska, H.

doi:10.1088/1757-899x/245/3/032017

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…For the characterization of the pore structure, mercury intrusion porosimetry (MIP) was applied. The MIP method is commonly used to characterize the pore structure in porous materials, due to its simplicity, quickness and wide pore diameter measuring range (Strzałkowski and Garbalińska 2017). In order to obtain information about the pore size distribution of the cement matrix, a MIP test was performed on small-cored samples taken from the specimens.…”

Section: Mercury Intrusion Porosimetry (Mip)mentioning

confidence: 99%

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

et al. 2019

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This contribution investigates the effects of seawater and colloidal silica (NS) in the amounts of 1, 3 and 5 wt%, respectively, on the hydration, strength development and microstructural properties of Portland cement pastes. The data reveal that seawater has an accelerating effect on cement hydration and thus a significant contribution to early strength development was observed. The beneficial effect of seawater was reflected in an improvement in compressive strength for up to 14 days of hydration, while in the 28 days compressive strength values were comparable to that of cement pastes produced with demineralized water. The combination of seawater and NS significantly promotes cement hydration kinetics due to a synergistic effect, resulting in higher calcium hydroxide (CH) production. NS can thus react with the available CH through the pozzolanic reaction and produce more calcium silicate hydrate (C-S-H) gel. A noticeable improvement of strength development, as the result of the synergistic effect of NS and seawater, was therefore observed. In addition, mercury intrusion porosimetry (MIP) tests confirmed significant improvements in microstructure when NS and seawater were combined, resulting in the production of a more compact and dense hardened paste structure. The optimal amount of NS to be mixed with seawater, was found to be 3 wt% of cement.

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Section: Mercury Intrusion Porosimetry (Mip)mentioning

confidence: 99%

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

et al. 2019

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“…It is common knowledge that the properties of given materials are determined by their internal structure and arrangement of pores, particularly those which can be filled with water in the liquid phase, cf. [7][8][9][10]. Table 2 lists the values of apparent density and moisture content by weight and volume specified for individual water-saturated blocks.…”

Section: Analysis Of the Results Of Strength Tests In Terms Of The Inmentioning

confidence: 99%

Evaluation of dampness-induced strength reduction of calcium silicate blocks

Garbalińska

Głowacka²,

Strzałkowski

2018

E3S Web Conf.

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Due to its numerous technical advantages as well as health benefits, sand-lime brick is increasingly used in the construction of brick walls, especially in residential buildings. Unfortunately, the occurrence of damp leads to a sharp deterioration of the technical properties of the material and the environmental conditions inside the building. Given the importance of this issue, an attempt was made to diagnose the extent of dampness variability of the main hygrothermal and strength characteristics of calcium silicate products. The study involved the basic material properties (density in dry and water-saturated conditions), moisture-related properties (capillary adsorption coefficient and sorptivity), thermal coefficients (thermal conductivity and volumetric heat capacity) as well as mechanical properties (compressive strength). This article describes diagnostic studies that were conducted to assess the extent of the effect of dampness on the strength of sand-lime products. In order to render the diagnosis more comprehensive and to include a wider range of silicate blocks available on the market, it was decided to examine three groups of silicate blocks (strength class 15, 20 and 25) obtained from three different factories. It was demonstrated that for all the examined groups dampness caused a significant decrease in compressive strength ranging from about 30% to about 40%.

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“…Despite this, there is a not very strong correlation between the results. The mercury method seems to be effective for pore analysis below 1 um, while in the case of optical analysis, it allows the determination of pore contents larger than 10 um [49,50]. Figure 15 shows the relative weight losses of the tested concretes during the first year of curing.…”

Section: Ref-0mentioning

confidence: 99%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

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Porosimetric, Thermal and Strength Tests of Aerated and Nonaerated Concretes

Cited by 13 publications

References 9 publications

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

The effects of seawater on the hydration, microstructure and strength development of Portland cement pastes incorporating colloidal silica

Evaluation of dampness-induced strength reduction of calcium silicate blocks

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

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