Experimental Study on Frost Resistance of Concrete in Seawater

2014 ◽  
Vol 507 ◽  
pp. 254-257 ◽  
Author(s):  
Li Kun Qin ◽  
Ling Xia Gao ◽  
Hong Wei Song ◽  
Xiu Wei Wang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Peak Stress ◽  
Test System ◽  
Freezing And Thawing ◽  
Dynamic Triaxial Test ◽  
Mathematical Expressions ◽  
Stress Point ◽  
Freezing And Thawing Cycles ◽  
Fast Freezing

The experiments of concrete in seawater under 0, 25, 50, 75 and 100 freezing-thawing cycles were performed using fast freezing and thawing method. Appling large concrete static and dynamic triaxial test system, the influence of freezing and thawing cycles on compressive strength and strain at peak stress point of concrete in seawater were detected, and then simple mathematical expressions were established.

scholarly journals Experimental study of σ - ε diagrams of concrete under uniaxial compression and the influence of freezing and thawing cycles on the form of the diagrams

2020 ◽  
Vol 17 (4) ◽  
pp. 80-88
Author(s):  
V. M. Popov ◽  
◽  
M. G. Plyusnin ◽  
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Uniaxial Compression ◽  
Reinforced Concrete Structures ◽  
Deformation Characteristics ◽  
Freezing And Thawing ◽  
Coefficients Of Variation ◽  
Initial Modulus ◽  
Compressive Strength Of Concrete ◽  
Freezing And Thawing Cycles

As a result of the experimental study, there was estimated the variability of the form of complete diagrams σ-ε of concrete under uniaxial compression. It is shown that the coefficients of variation of concrete deformation characteristics are comparable with the coefficient of variation of strength within one concrete class in terms of compressive strength. It was found out that the effect of freezing and thawing cycles leads not only to a decrease in the compressive strength of concrete, but also to a decrease in the ultimate deformations and the initial modulus of elasticity. Thus, when using diagram methods for calculating reinforced concrete structures, it is necessary to take into account the influence of variability not only in the strength, but also in the deformation characteristics of concrete.

scholarly journals The analysis of influence of polymer admixtures on properties of lightweight concrete

2019 ◽  
Vol 252 ◽  
pp. 08007 ◽  
Author(s):  
Jacek Góra ◽  
Danuta Barnat-Hunek ◽  
Paweł Wlaź ◽  
Monika Garbacz
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Statistical Analysis ◽  
Lightweight Concrete ◽  
Strength Properties ◽  
Freezing And Thawing ◽  
Factors Of Influence ◽  
Freezing And Thawing Cycles ◽  
Acetate Copolymer

The article presents the results of testing physical and strength properties of concrete with the addition of lightweight perlite in the amount of 10 and 20%. The additive was introduced by volume substituting a part of the sand. In addition, the effect of using siloxane admixtures and a vinyl acetate copolymer with different degree of dosing, as well as applied simultaneously, were analysed. The tests were carried out in the field of bulk density and proper density, determination of tightness and porosity, compressive strength and tensile strength after 28 days of maturation. In terms of durability of concrete, absorption and resistance of concretes to the freeze-up effects after 100 freezing and thawing cycles were tested. The results of the study were subjected to statistical analysis using the analysis of variance. The analysed factors of influence were the amount of perlite addition, as well as the type and amount of the added admixture

scholarly journals Experimental Study on Crack Development of Rock Specimens by Freezing and Thawing Cycles

2000 ◽  
Vol 40 (2) ◽  
pp. 41-48 ◽  
Author(s):  
Tian Cheng Chen ◽  
Noriyasu Mori ◽  
Teruyuki Suzuki ◽  
Hitoshi Shoji ◽  
Takashi Goto
Keyword(s):  
Experimental Study ◽  
Crack Development ◽  
Freezing And Thawing ◽  
Freezing And Thawing Cycles ◽  
Rock Specimens

Weather resistance of CaSO4 ⋅ 1/2H2O-based sand-fixation material

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744084 ◽  
Author(s):  
Xin Liu ◽  
Shengnian Tie
Keyword(s):  
Compressive Strength ◽  
Wind Erosion ◽  
Water Resistance ◽  
Erosion Resistance ◽  
Field Tests ◽  
Northwest China ◽  
Freezing And Thawing ◽  
Weather Resistance ◽  
Freezing And Thawing Cycles ◽  
Water Holding

Searching for an economical and effective sand-fixing material and technology is of great importance in Northwest China. This paper described the use of a semihydrated gypsum-(CaSO4 ⋅ 1/2H2O-)based composite as a sand-fixing material. Its morphology and composition were characterized by SEM, and its water resistance, freezing–thawing resistance and wind erosion resistance were tested in the field. The results indicated that semihydrated gypsum-(CaSO4 ⋅ 1/2H2O-)based sand-fixing composite has good water resistance and water-holding capacity. Its strength is maintained at 1.42 MPa after 50 freezing and thawing cycles, and its wind erosion increases with increasing wind speed and slope. Its compressive strength starts to decrease after nine months of field tests with no change in appearance, but it still satisfies the requirements of fixation technology. This sand-fixing material should have wide application owing to its good weather resistance.

Effect of Polypropylene Fibers on some Mechanical Properties of Concrete and Durability against Freezing and Thawing Cycles

2021 ◽  
Vol 895 ◽  
pp. 130-138
Author(s):  
Maher Faroq Al-Lebban ◽  
Abeer Ibraheem Khazaly ◽  
Rana Shabbar ◽  
Qusay A. Jabal ◽  
Layth Abdul Rasool Al Asadi
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Polypropylene Fibers ◽  
Freezing And Thawing ◽  
Freezing And Thawing Cycles ◽  
Durability Of Concrete

This investigation aims to improve some of the mechanical properties of concrete such as compressive strength, flexural strength, and modulus of elasticity, by using different percentages of polypropylene fibers, and also studying the durability of concrete for freeze-thaw cycles. the study shows a small increment in compressive strength due to adding fibers which were 28.3% compared with increment in flexural strength which was perfect (about 191%), modulus of elasticity also increased by adding fibers. The durability of concrete against freezing-thaw cycles for all mixes was studied. Fiber-reinforced concrete shows more durability against freezing-thawing cycles and less reduction in strength compared with reference mixes without fibers,21.5% reduction in strength for optimum polypropylene fiber concrete while the reduction in strength for normal concrete was found 54.2% in this study.

Experimental Research on Mixture Ratio and Mechanical Properties of Unburned Brick with Shell Ash and Fly Ash

2011 ◽  
Vol 250-253 ◽  
pp. 3299-3304 ◽  
Author(s):  
Zhong Jian Sun ◽  
Mei Ling Tian ◽  
Yan Feng Fang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Raw Materials ◽  
Experimental Result ◽  
Wall Material ◽  
Freezing And Thawing ◽  
Mixture Ratio ◽  
Cement Ratio ◽  
Freezing And Thawing Cycles

The unfired bricks which regarded as a new green wall material are produced by fly ash, shell ash (renewable resources), cement and lime as the main raw materials, and together with the chemical activator. The essential mixture ratio is designed on the experimental result of its mechanical properties and durability. The bricks are water conserved in the condition of normal temperature and pressure. We respectively research the compressive and flexural strength and frost resistance of the unburned brick. The results show that the optimum mixture ratio for unburned bricks are: fly ash 41%, cement 25%, lime 15%, shell ash 15%, gypsum 4%, SBR 3%, fiber 0.10%, water-reducing admixture 0.5%, sand cement ratio 0.5 and water cement ratio 0.3. We obtain the properties of unburned bricks that produced by vibration with the optimum mixture ratio. The minimum compressive strength of one brick more than 30MPa, the mass loss of one brick after 15 times freezing and thawing cycles is only 1%, and the compressive strength after frost reaches 26MPa, the overall performance of bricks can satisfy the requirement of " China Fly Ash Brick " standard.

scholarly journals Effect of Expanded Perlite Aggregate Size on Physical and Mechanical Properties of Ultra Lightweight Concrete Produced with Expanded Perlite Aggregate

2019 ◽  
Author(s):  
Mucip Tapan ◽  
Celil Engin
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Bending Strength ◽  
Lightweight Concrete ◽  
Unit Weight ◽  
Ultra Sound ◽  
Expanded Perlite ◽  
Freezing And Thawing ◽  
Freezing And Thawing Cycles

In this study, ultra-light weight concrete (ULWC) with heat-insulating properties is produced by using different size expanded perlite aggregates and various admixtures. The compressive strength, 4 point bending strength, freezing and thawing resistance, water absorption, dry unit weight, ultra sound velocities and thermal conductivity of the samples were determined by applying appropriate tests. The effect of different size expanded perlite aggregate on the properties of ULWC were also investigated in this study and it was found that as the expanded perlite aggregate diameter increased, the void volume uniformity, water absorption percentage and freezing-thawing resistance increased while the unit volume weight of ULWC samples, ultrasound speed velocities, thermal conductivity and compressive strength were decreased. The changes in the masses and compressive strength of ULWC samples subjected to freezing and thawing cycles were examined. The compressive strength loss was found to be between 5 % and 47 % while the weight loss was between 1 % and 3.5 % after 15 freezing and thawing cycles. Finally, the effects of the admixtures on the fresh properties of ULWC were examined and it was determined that the use of 4.5 kg of air-entraining material in one cubic meter of concrete mix is the most ideal ratio and the use of more than 0.01 % by volume of polypropylene fiber is caused settlements in fresh concrete mixtures.

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