Influence of Low Temperature on Concrete Properties

Mazur, Bartosz; Kotwa, Anna

doi:10.1088/1757-899x/471/3/032026

Cited by 5 publications

(3 citation statements)

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“…The test results indicated that UHPFRC had higher resistance to microcrack formation and better flexural performance rather than normal concrete [ 21 ]. Moreover, Mazur et al (2019) also carried out laboratory tests to reveal the negative effect under low temperature and suggest the improved ways of mix design with respect to decease in w/c ratio, type of cement and aggregate and use of aeration admixture [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Mechanical, Thermal and Durability Properties of High-Volume GGBS Blended Concrete Exposed to Cryogenic Conditions

Lee

2021

Materials

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The purpose of this study is to suggest the optimum mix design with a high volume of GGBS (Ground Granulated Blast-furnace Slag) replacement and the procedure of the cryogenic test to consider mechanical and thermal properties, and durability performance. To decide the optimum mix design, four mix designs with high-volume of GGBS replacement were suggested, in terms of the slump and retention time. Based on the test results, with respect to the workability and compressive strength, the mixtures with 65% of GGBS (C40-2 and C40-4) were better than the mixtures with 50% and 60% of GGBS (C40-1 and C40-3). After selecting two mixtures, two types of cryogenic test methods were conducted under one-cycle cryogenic condition (Test A) and 50-cycles cryogenic condition (Test B). As a result, in Test A, the compressive strength and elastic modulus of the C40-2 and C40-4 mixtures tended to be decreased over time, because of the volume expansion of ice crystals contained in the capillary pores. In Test B, the mechanical properties of the C40-4 mixture were better than those of the C40-2 mixture, in terms of the reduction rate of compressive strength and elastic modulus. In the view of the heat of hydration, the semi-adiabatic test was conducted. In the results, the C40-4 mixture was better to control the thermal cracks. Thus, the C40-4 mixture would be more suitable for cryogenic concrete and this procedure could be helpful to decide the mixture of cryogenic concrete. In the future, the long-term performance of cryogenic concrete needs to be investigated.

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Section: Introductionmentioning

confidence: 99%

Assessment of Mechanical, Thermal and Durability Properties of High-Volume GGBS Blended Concrete Exposed to Cryogenic Conditions

Lee

2021

Materials

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“…The start time of setting depends on the ambient temperature [1]. At a temperature of 20 ° C, the setting begins about 1 hour after pouring the concrete mixture into the mold, when the temperature drops to 0 ° C, the beginning of setting of the cement begins after 6-8 hours [2][3][4]. At high temperatures, when concrete is steaming, setting sets in 15-20 minutes [5].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Volumetric Hydrophobization on Moisture Transfer during Hardening of Concrete

Fedosov

Rumyantseva

Konovalova

2020

MSF

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The influence of volumetric hydrophobization of cement stone samples on mass transfer processes during hardening has been studied. It was found that the introduction of a hydrophobizing additive at the stage of sample production reduces the amount of water evaporating during drying. With increasing concentration of the hydrophobizer mass transfer processes are slowed down during the hardening of cement concretes, which affects their structural and phase composition, strength characteristics and durability.

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“…When the mean ambient temperature is lower than +10 °C for at least three subsequent days, special requirements apply to the execution of concrete works. The temperature of +5 °C is regarded as the boundary temperature below which the concrete mix shall be protected from heat loss [ 1 , 2 , 3 , 4 , 5 , 6 ]. The literature describes numerous cases of doing works in such temperature conditions, including the cases showing negative effects of such operations [ 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Lowered Temperature on Efficiency of Concrete Repair with Polymer-Cement Repair Mortars

2020

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This paper presents research dealing with the evaluation of the efficiency of concrete repairs with polymer-cement mortars made at low temperatures with two types of cement and modified by copolymer acrylic-styrene. The low temperature used for the tests, of about 8 °C, is representative for Central Europe, and was established based on the analysis of mean temperatures in Poland during the last 45 years. A comparative analysis of the basic properties of the mortar tested, important from the point of view of repair efficiency, was performed, i.e., flexural and compressive strength, modulus of elasticity, adhesion to the substrate, and porosity for mortars applied and cured at 8 °C and 21°, respectively. The studies were conducted using standard methods and supported with an assessment of microscopic images (1000× magnification). It was shown that when the temperature of polymer-cement composite (PCC) mortar application is lowered to values slightly exceeding the minimum film-forming temperature (MFT) temperature of the polymer modifier, the type of cement determines the effectiveness of the repair. Only for PCC mortar with CEM I sulfate-resistant types of cement was it possible to achieve the same strength parameters as at 21 °C, during 28 days of mortar curing, and at a lowered temperature. Starting from day seven of setting at both above-mentioned temperatures, a relation between the values of the flexural and compressive strength expressed as a quotient of these values, amounting to ca. 0.14–0.19, was found.

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Influence of Low Temperature on Concrete Properties

Cited by 5 publications

References 0 publications

Assessment of Mechanical, Thermal and Durability Properties of High-Volume GGBS Blended Concrete Exposed to Cryogenic Conditions

Assessment of Mechanical, Thermal and Durability Properties of High-Volume GGBS Blended Concrete Exposed to Cryogenic Conditions

The Effect of Volumetric Hydrophobization on Moisture Transfer during Hardening of Concrete

Influence of Lowered Temperature on Efficiency of Concrete Repair with Polymer-Cement Repair Mortars

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