Optional reference method to determine frost resistance of concrete

The task of the project is obtaining the dependence between the relative decreasing of strength and rate of strain and substantiation of the new method for determination of concrete frost resistance. It has been analytically proved that using concrete’s rate of strain ε as a measure of damage, instead of decreasing of tensile strength R, increases freeze-thaw resistance’s accuracy of estimation a lot under otherwise equal conditions by the time of freeze-thaw cycling. Also it has been experimentally shown that ratio of relative decreasing R to ε in direction, perpendicular to compression, is assumed to be independent on values R and ε for a given concrete and on the ways of achieving them during mechanical or freeze-thaw cycling. To determine the dependence δR/R by ε (z) 8 specimens were tested by non-destructive method (RU 2 490 631) and two baths of 50 specimens by basic method (thermo cycling). Results of the non-destructive method are different from results by basic method for 6,3%. Dependence of relative decreasing in strength by rate of strain is near to linear and, therefore, value of z is constant. Taking this into account patented methods for estimation of concrete’s freeze-thaw resistance as per values R and ε received after freezing and thawing cycles of some specimens and their postlimenary failure by linear compression was substantiated.

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“…After taking into account theese results new method for determination of concrete frost resistance was offered by application for a patent [24].…”

Section: Resultsmentioning

confidence: 99%

Dependence of Relative Decreasing in Strength by Rate of Strain for the New Rapid Method for Determination of Concrete Frost Resistance

Pertseva

Nikolskiy

2015

AMM

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“…Moreover, high-strength concretes have an affordable production technology, as they are made of concrete mixtures based on the existing production facilities and traditional materials. The structures made of high-strength concrete have high chemical resistance and durability [5][6], as a result they can be used in harsh climatic conditions, typical for cold regions of the Nordic countries. In addition, the material exhibits excellent characteristics during an earthquake, which is an extremely acute problem in seismically dangerous areas such as Kamchatka in Russia, Indonesia or Japan.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Conventional and High-strength Concrete

et al. 2018

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Important characteristics for the Nordic countries: a freeze-thaw resistance and an ability of a material to keep heat inside the building. This paper aims to define the thermophysical properties of a high-strength concrete, compare the discovered performance with the conventional concrete properties. With this object in mind two experiments in cold chamber “CHALLENGE 250” have been conducted and followed by analysis. In these experiments, the insulation of facades is beyond the framework of the investigation. Only the thermophysical properties of concrete are taken into account. The samples were affected by temperature fluctuations. Results from the experiments show that strength characteristics of a material are in indirect ratio to accumulation properties of a structure. This conclusion is directly related to porosity of material and additives. During 70 minutes, with outside temperature being below zero, the temperature inside the concrete dropped to an average. As the outside temperature increases significantly to more than zero, the temperature inside the concrete has become below average (continued to decline) in 70 minutes. The more strength of material, the better thermophysical properties. High-strength concrete is less susceptible to temperature fluctuations, therefore more heat-resistant. As mentioned in the paper below, the material has one disadvantage: this is a large cost per cubic meter.

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“…Denikin, J.G. Barabanshikov, S.G. Nikolskiy, S. Belyaeva, A. Korsun, V. Korsun, V.D Staroverov [8][9][10][11][12][13][14][15][16][17][18][19][20][21] study the quality assessment elements paving and other building materials.…”

Section: Introductionmentioning

confidence: 99%

Examination of Quality and Operational Properties of Vibropressed Paving Elements

et al. 2016

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Abstract. This article presents research findings on examination of quality of paving elements. Were investigated and analyzed performance properties of paving slabs on following: accuracy of geometric dimensions, appearance, compressive strength, frost resistance, water absorption and abrasion. Based on these results recommendations improving the current regulatory and technical documentation are provided.

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Optional reference method to determine frost resistance of concrete

Cited by 3 publications

References 4 publications

Dependence of Relative Decreasing in Strength by Rate of Strain for the New Rapid Method for Determination of Concrete Frost Resistance

Dependence of Relative Decreasing in Strength by Rate of Strain for the New Rapid Method for Determination of Concrete Frost Resistance

Thermal Properties of Conventional and High-strength Concrete

Examination of Quality and Operational Properties of Vibropressed Paving Elements

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