The effect of saturation degree of cement paste on fair-faced concrete surfaces

Károlyfi, Kitti Ajtayné

doi:10.14382/epitoanyag-jsbcm.2017.10

Cited by 7 publications

(6 citation statements)

References 1 publication

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“…As expected, the overall surface quality of the mixtures became even higher with increasing saturation degree in the tested range. This leads to the conclusion that the optimal saturation degree is between 88 and 121 [l/m 3 ], which value is considerably higher, than the recommended [13].…”

Section: Fig 3 Average Surface Void Ratio Of the Samplesmentioning

confidence: 99%

The correspondences between formwork geometry and concrete composition in the case of fair-faced concrete elements

Károlyfi

Papp

2018

Pollack Periodica

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Modern architecture is unimaginable without fair-faced concrete. However, there is no generally accepted method for design the suitable concrete composition to get the required surface quality. This paper presents the effect of saturation degree on fair-faced concrete surfaces and raises additional research areas with regard to the formwork geometry and packing density of aggregate. This study is the first part of a wider research that aims to work out a method for determination of the adequate saturation degree of cement paste depending on the geometrical proportions of the formwork to reach the highest surface quality.

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Section: Fig 3 Average Surface Void Ratio Of the Samplesmentioning

confidence: 99%

The correspondences between formwork geometry and concrete composition in the case of fair-faced concrete elements

Károlyfi

Papp

2018

Pollack Periodica

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“…Three-dimensional photography measurement is quantitative method for concrete surface irregularity evaluation using photogrammetry and digital image processing 9) . As for the concrete frost damage against depth, it is important issue with surface irregularity to grasp the portionʼs quality degree.…”

Section: Three Dimension Photo Measurement 1 Concrete Surface Irregul...mentioning

confidence: 99%

A Concrete Frost Scaling Mechanism by Exposed to Deicing Chemicals With Dilution Water

TAKASHINA,

SHEN

2024

Cement Science and Concrete Technology

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：Frost scaling damage to concrete structures is affected by complex combinations of multiple factors. Therefore concrete scaling mechanism is not yet completely understood. This study examines concreteʼs damage exposed to deicing chemicals within dilution water. The existence of the dilution water is greatly connected with salt frost damage. The neural networkʼs analysis is effective for clarification of the relationship among complicated factors. This study revealed an important relationship between scaling damage and dilution water. A scaling damage evaluation was confirmed using a thermographyʼs technique. And concrete surface irregularity is grasped by three-dimensional photograph digital measurement systems.

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“…There is a large body of research on the subject, so a wide range of literature is available. There are also an extensive number of peer-reviewed journals on the study of abrasion and fragmentation; however, in the area of transport engineering [6,7], research is being carried out in almost all fields, from mining, rock physics, geology [8][9][10], mechanical and vehicle engineering [11], to architecture and civil engineering [12][13][14] and [15,16], as well as logistics [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

Huschek-Juhász,

Németh,

Sysyn

et al. 2024

Nauk. visn. nat. hirn. univ.

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The physical classification of crushed stone and gravel used in railway construction is based on their strength and endurance and is performed by a laboratory test method using a rotating drum or a mortar method. The values of fracture resistance calculated using the Los Angeles method and abrasion calculated using the Micro-Deval method show a corresponding correlation and require further investigation. Purpose. The development of a new method for measuring rock material fracture that is consistent with widely used standards while also being more comparable to real-world railway operating conditions. Certainly, both standard tests are essential for ensuring product homogeneity during production, so the new recommended method is only a supplement. Methodology. The Proctor device was used to induce so-called shock loads from above, similar to railway loading conditions. Unlike the standard method, the andesite material was placed in a standard cylinder in these tests. The samples were pre-screened and sorted; the specified weight was approximately 1,300 g, and the specified sizes of the individual particles were 6.3, 8.0 and 11.2 mm. Only prewashed and dried materials of NZ (fine crushed stone) or KZ (special crushed stone) from four different quarries (Tállya, Szob, Nógrádkövesd, Recsk) with different rock physics characteristics were considered. The Proctor compactor machine was used because of its calculable labor (19.86 J/impact) and the crushing effect of the calculable impacts (64, 128, 256 and 1,028 blows). Even after loading different numbers of impacts, homogeneous samples from different quarries were sieved to measure the masses of fragments per fraction. Findings. The set of measurements made it possible to establish a series of fragmentation and degradation curves for each of the three repeated measurements based on the composition of the material and the number of blows, which showed the degradation of samples with different physical and mechanical properties of the rock material and particle sizes. With an increasing number of impacts, the amount of crushed material in the sample increased, but the distribution of crushed material did not decrease evenly and proportionally as the number of impacts increased. Parameters and indices were also computed to identify various correlations (i. e., FV, d < 22.4, d < 0.5, d < 0.063 mm, CU, M ratio,  ratio). Some of them (e. g., FV) needed to be changed, but they were predefined due to the nature of the tests. Originality. While many standard and alternative railway track ballast fragmentation test methods and measurement tools are available, this paper proposes a new laboratory method and demonstrates the specific measurement and application effectiveness. Practical value. In addition to standard tests that are already widely used, the new method for measuring the fractional composition of railway ballast can help simulate real-world operating conditions of a railroad track in the laboratory. This method will improve the safety of railway operations.

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The effect of saturation degree of cement paste on fair-faced concrete surfaces

Cited by 7 publications

References 1 publication

The correspondences between formwork geometry and concrete composition in the case of fair-faced concrete elements

The correspondences between formwork geometry and concrete composition in the case of fair-faced concrete elements

A Concrete Frost Scaling Mechanism by Exposed to Deicing Chemicals With Dilution Water

Testing the fragmentation of railway ballast material by laboratory methods using Proctor compactor

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