Durability Evaluation of Frost-Resistant Concrete Modified with Additives

2014 ◽  
Vol 711 ◽  
pp. 370-375
Author(s):  
Jarosław Rajczyk ◽  
Jacek Halbiniak ◽  
Bogdan Langier
Keyword(s):  
Image Analysis ◽  
Compression Strength ◽  
Frost Resistance ◽  
Automatic Image Analysis ◽  
Freezing And Thawing ◽  
Water Penetration ◽  
Sodium Bentonite ◽  
Porosity Structure ◽  
Air Content ◽  
Concrete Mix

The article presents the influence of the addition of microsilica, finely divided sodium bentonite and air-entraining admixture for concrete frost-resistance and characteristics of examined concrete pores. Examination of frost-resistance was conducted for 150 cycles of freezing and thawing. For selected series of concrete the examination of the porosity structure of concrete composites was conducted with the use of a device for automatic image analysis and computer program Lucia Concrete. What is more, there was made a designation of: consistency of concrete mix, air content in concrete mix, compression strength, water penetration depth and concrete absorbability.

The Characterization of Porosity and Frost Resistance of Concrete with Fly Ashes Modified

2014 ◽  
Vol 1020 ◽  
pp. 193-198
Author(s):  
Jacek Halbiniak ◽  
Bogdan Langier
Keyword(s):  
Pore Structure ◽  
Frost Resistance ◽  
Fly Ashes ◽  
Water Penetration ◽  
Freeze Resistance ◽  
Air Content ◽  
Pressure Method ◽  
Concrete Mix ◽  
Aerated Concrete

The paper presents the influence of fly ashes for the parameters which define the characteristics of the air pore and frost resistance of aerated concrete. Concrete which was used in the maximum allowable amount of fly ashes and different amounts of air admixture have been evaluated. Test of concrete mix have been performed such as the slump cone consistency and air content with pressure method used. Compressive strength, the depth of water penetration under pressure, at 150 cycles freeze resistance and the characteristics of the air pores have been evaluated for concrete. Parameters characterizing the pore structure have been marked: the total air content in concrete A, the ratio of pores location L, the content of micropores A300. The results of the study have shown that it is possible to provide good frost resistance of concrete containing fly ashes. Air content of about 4% provides increased resistance to frost well as the use of fly ashes. The condition of frost resistance is to ensure the proper pore structure of the aircraft.

On site characterization and air content evaluation of coastal soils by image analysis to estimate liquefaction risk

2008 ◽  
Vol 45 (12) ◽  
pp. 1723-1732 ◽  
Author(s):  
P. Breul ◽  
Y. Haddani ◽  
R. Gourvès
Keyword(s):  
Image Analysis ◽  
Automatic Image Analysis ◽  
Coastal Structures ◽  
Wave Forcing ◽  
Air Content ◽  
Geotechnical Characterization ◽  
Sea Bed ◽  
Coastal Soils ◽  
Tide Period ◽  
Key Parameter

Coastal structures are often submitted to intense wave forcing. In some cases, structures may have stability disorders due to the constant weakening of their foundations and to momentary liquefaction of the sea bed. Studies have shown that if classical geotechnical characterization is a necessity, air content in the soil is also a key parameter for liquefaction evaluation. That is why on site air content measurement and its time variation during a tide period may provide information and help to determine a better understanding of this problem. Unfortunately, this parameter is difficult to measure during investigations. This article presents a technique based on the use of geoendoscopy and automatic image analysis, which makes it possible to characterize coastal soils and to estimate their air content. After a description of the technique, the results obtained on laboratory tests and on a real site are presented.

scholarly journals The application of natural zeolite to cement concrete intended for communications surfaces

2018 ◽  
Vol 45 ◽  
pp. 00047 ◽  
Author(s):  
Małgorzata Linek ◽  
Wojciech Żebrowski ◽  
Paweł Wolka
Keyword(s):  
Internal Structure ◽  
Frost Resistance ◽  
Natural Zeolite ◽  
Physical Parameters ◽  
Hardened Concrete ◽  
Concrete Durability ◽  
Cement Concrete ◽  
Freezing And Thawing ◽  
Concrete Mix ◽  
Zeolite Content

The article presents the application of a cement substitute in the form of natural zeolite to cement concrete. The reference mix design intended for communications surfaces and a mix of modified composition taking into consideration zeolite content were prepared. The basic parameters of concrete mix components were specified, including basalt aggregate, cement and zeolite. The influence of the applied zeolite of a grain-size distribution up to 50μm on the obtained parameters of concrete mix and hardened concrete was determined. It was observed that the applied zeolite contributes to the modification of the internal structure of concrete composite and consequently to the increase of the mechanical and physical parameters of hardened concrete tested within diversified standard periods of time. Due to the fact that the resistance of concrete to cyclic freezing and thawing is the determinant of concrete durability, in the case of pavement structure, hardened concretes were subject to a frost resistance assessment. The influence of zeolite content on both internal and external frost resistance of hardened concrete was specified. SEM observations of the internal structure of concretes exposed to the influence of freezingthawing cycles proved the advantageous changes of zeolite occurrence in concrete mix. A reduction of cement quantity and its replacement thereof with the suggested zeolite allows obtaining a pavement quality concrete of a more favourable internal micro structure and distinguished by higher parameters.

scholarly journals The influence of post-consumer car mats waste on selected concrete parameters

2018 ◽  
Vol 49 ◽  
pp. 00082
Author(s):  
Alina Pietrzak ◽  
Małgorzata Ulewicz
Keyword(s):  
Portland Cement ◽  
Bulk Density ◽  
Compression Strength ◽  
Frost Resistance ◽  
Large Degree ◽  
Freezing And Thawing ◽  
Concrete Mixtures ◽  
Waste Rubber ◽  
Two Samples ◽  
Polymeric Wastes

In recent years, a systematic increase of various types of wastes has been observed, including polymeric wastes that, to a large degree, are difficult to manage. The present paper deals with the problem of car mats wastes and the possibility of their application for producing concrete composites. The scope of the research involved designing and making concrete mixtures modified by waste rubber retrieved from rubber car mats. For the experiment the authors used: Portland cement CEM I 42,5R, sand, gravel aggregate of the 2-8 and 8-16 fractions, water, plasticizing and aerating admixture and car mats wastes fragmented into 0-2 mm and 2-8 mm. The authors made 4 series of concrete samples modified by wastes, for which the following factors have been assigned: compression strength after 7 and 28 days of maturing, absorptivity, frost resistance F100 of freezing and thawing and bulk density. In two samples’ composition (S1 and S2) the authors used 2-8 mm fraction rubber wastes as a substitute for 2-8 mm gravel in the amount of 5% and 7,5% of the cement bulk, making the density correction of 2-8 gravel. In contrast, in the remaining two samples S3 and S4 were modified by rubber wastes of the 0-8 mm fraction in the amount of 5% and 10%, respectively, of the cement bulk, subtracting a certain amount of the aggravate mixture at the same time. The research conducted for the series of the designed concrete samples, unfortunately did not confirm the thesis that rubber wastes retried from rubber car mats could be reused as the aggravate substitute.

scholarly journals Influence of Varied Waste Ceramic Fillers on the Resistance of Concrete to Freeze–Thaw Cycles

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 624
Author(s):  
Jacek Katzer ◽  
Jacek Halbiniak ◽  
Bogdan Langier ◽  
Maciej Major ◽  
Izabela Major
Keyword(s):  
Image Analysis ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Direct Method ◽  
Waste Materials ◽  
Ceramic Tiles ◽  
Freezing And Thawing ◽  
Freeze Thaw ◽  
Air Content ◽  
Ceramic Fillers

Our research focused on the influence of fillers obtained from crushed waste materials on the selected properties of concrete composites. The used waste materials were sourced from the production of ceramic tiles, ceramic pots, and sanitary ceramics. We evaluated concretes modified with the addition of 10% (by mass of cement) of different fillers. The properties, including the air content in the fresh concrete mix, consistency, compressive strength, and freeze-thaw resistance were examined. The evaluation of the freeze-thaw resistance was carried out by testing the concrete with the direct method for 150 cycles of freezing and thawing. The characteristics of the concrete porosity structure were assessed using automated digital image analysis. Concretes modified by coarse and fine fillers were characterized by different improvements in the mechanical properties and resistance to cycles of freezing and thawing. Composites with the addition of coarse fillers did not show any significant changes in comparison to the control concrete. An automated digital image analysis of the pore distribution in concrete proved to be an effective tool for the assessment of the freeze–thaw resistance of the concretes in question.

The Effect of Concrete Mix Proportion to the Air Bubble Spacing Coefficients of Hardened Concrete

2017 ◽  
Vol 726 ◽  
pp. 537-541
Author(s):  
Yang Wang ◽  
Hui Chao Liang ◽  
Bao Cheng Zhao ◽  
Yu Chuan Jiang
Keyword(s):  
Frost Resistance ◽  
Influence Factor ◽  
Fresh Concrete ◽  
Important Influence ◽  
Hardened Concrete ◽  
Air Bubble ◽  
Air Content ◽  
Mix Proportion ◽  
Concrete Mix

A large number of studies have shown that the air content of fresh concrete and the air bubble spacing coefficients of hardened concrete can be used to characterize the frost resistance of concrete. The performance of air-entraining agent is an important influence factor of these two indexes, and the effect of concrete mix proportion cannot be ignored. In this paper, the effect of concrete mix proportion to the air bubble spacing coefficients of hardened concrete has been studied through a series of tests.

Study on Frost Resistance of Concrete Used in Pavement of Northeast China

2011 ◽  
Vol 71-78 ◽  
pp. 728-732
Author(s):  
Song Gao ◽  
Li Dai
Keyword(s):  
Compression Strength ◽  
Frost Resistance ◽  
Northeast China ◽  
Loss Rate ◽  
Mass Loss Rate ◽  
Silicon Powder ◽  
Early Spring ◽  
Good Prospect ◽  
Freezing And Thawing ◽  
Flexure Strength

According to the cycles of freezing and thawing frequently happened during early spring and late autumn in northeast china, this paper studies on the frost resistance of concrete using in highway pavement. Making experiments by adding flyash, silicon powder, air entraining and water reducing agent to normal concrete with different proportions and using flexure strength, compression strength and mass loss rate of concrete as evaluating indicators, a reasonable and economic concrete proportion is determined, which reaches high flexure strength and compression strength, good frost resistance. On the bases of the experimental results and economic analysis, it is shown that the concrete proportion can effectively enhance the frost resistance of concrete. Therefore, it has good use value and it is promising with a good prospect of application.

scholarly journals Properties and Structure of Concretes Doped with Production Waste of Thermoplastic Elastomers from the Production of Car Floor Mats

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 872
Author(s):  
Malgorzata Ulewicz ◽  
Alina Pietrzak
Keyword(s):  
Tensile Strength ◽  
Production Process ◽  
Compression Strength ◽  
Physical And Mechanical Properties ◽  
Thermoplastic Elastomer ◽  
Thermoplastic Elastomers ◽  
Production Waste ◽  
Fine Aggregate ◽  
Freezing And Thawing ◽  
Average Decrease

This article presents physical and mechanical properties of concrete composites that include waste thermoplastic elastomer (TPE) from the production process of car floor mats. Waste elastomer (2–8 mm fraction) was used as a substitute for fine aggregate in quantities of 2.5, 5.0, 7.5, and 10% of the cement weight. For all series of concrete, the following tests were carried out: compression strength, bending tensile strength, splitting tensile strength, absorbability, density, resistance to water penetration under pressure, frost resistance, and abrasion resistance, according to applicable standards. Moreover, SEM/EDS analysis was carried out on the surface microstructure of synthesized concrete composites. It was proven that the use of production waste from the production process of car floor mats in the quantity of 2.5% does not influence the change of the concrete microstructure and it does not result in the decrease of the mechanical parameters of concrete modified with waste. All concrete modified with the addition of waste meet standards requirements after carrying out 15 cycles of freezing and thawing, and the average decrease in compression strength did not exceed 20%. Adding waste in the quantity of 2.5% allows for limiting the use of aggregate by about 5%, which is beneficial for the natural environment.

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