scholarly journals Influence of different surface treatment on water penetration resistance of concrete

2021 ◽  
Vol 272 ◽  
pp. 01015
Author(s):  
Tianlun Li ◽  
Yonggen Wu
Keyword(s):  
Surface Treatment ◽  
Water Permeability ◽  
Water Resistance ◽  
Concrete Surface ◽  
Penetration Resistance ◽  
Ethyl Silicate ◽  
Permeability Test ◽  
Water Penetration ◽  
Simple Method ◽  
Nano Sio2

Concrete is easily affected by all kinds of erosive substances during its use. Surface treatment is a simple method to improve the surface compactness and water permeability resistance of concrete. In this paper, silicate infiltration agent, nano-SiO2 and ethyl silicate are selected as concrete surface treatment material. The results of water permeability test showed that all the three treatments can effectively improve the water resistance. Silicate infiltration agent and nano-SiO2 were the most effective, which greatly reduced the penetration depth of water from 66 mm to 34mm and 32 mm, while ethyl silicate was reduced to 50 mm. Through the water permeability test curve, we can see that the water entered the concrete under a certain pressure, and the result showed the shape of high, middle and low edge.

Durability evaluation of concrete made of fly ash and copper slag

2021 ◽  
Author(s):  
Yousef Zandi
Keyword(s):  
Fly Ash ◽  
Water Permeability ◽  
Environmental Conditions ◽  
Electrical Resistance ◽  
Copper Slag ◽  
Resistance Test ◽  
Power Relationship ◽  
Good Precision ◽  
Permeability Test ◽  
Water Penetration

AbstractIn this paper, to improve the durability of concrete, fly ash has been used as a percentage of cement and copper slag rather than a percentage of sand. Using a resistance test and water permeability test, four series of concrete specimens containing fly ash and copper slag, each containing 49 concrete mixing designs, were evaluated. After obtaining the results, eight samples with the highest electrical resistance were selected and the specimens were again tested in different environmental conditions. The results show that the environmental conditions of sulfate and carbonate have the least and most impact on reducing durability and there is a power relationship, with good precision, between the water penetration of the test specimens and the electrical resistance of the test specimens.

Experimental Study on Water Permeability of Rubber Aggregate Concrete

2019 ◽  
Vol 815 ◽  
pp. 235-240
Author(s):  
Jin Ting Bai ◽  
Zhong Quan Xue ◽  
Mei Zhou ◽  
Bin Wu
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Regression Analysis ◽  
Water Permeability ◽  
Penetration Resistance ◽  
Water Penetration ◽  
Aggregate Concrete ◽  
Aggregate Content ◽  
Binary Regression Analysis ◽  
Practical Engineering

In this paper, the water penetration resistance of rubber aggregate concrete is studied by using the water penetration height method. The experiment results show that: Under the condition of the same dosage, the greater the fineness module, the better the impermeability. Under the condition of the same particle size, the higher the dosage, the better the impermeability. Moreover, the strength of rubber aggregate concrete cannot determine its impermeability. The impermeability of rubber aggregate concrete is analyzed by binary regression analysis. The results show that: Rubber aggregate content and fineness module have obvious influence on the water permeability of concrete. The established permeability regression equation can estimate the permeability height of rubber aggregate concrete, which has certain guiding significance for practical engineering.

Enhancing the mechanical and water resistance performances of bamboo particle reinforced polypropylene composite through cell separation

Holzforschung ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dan Ren ◽  
Xuexia Zhang ◽  
Zixuan Yu ◽  
Hankun Wang ◽  
Yan Yu
Keyword(s):  
Water Absorption ◽  
Cell Separation ◽  
Water Resistance ◽  
Dynamic Mechanical Properties ◽  
Simple Method ◽  
Interface Modification ◽  
Wood Particles ◽  
Bamboo Fibers ◽  
Pp Composites ◽  
Mechanical Performances

AbstractIt is frequently observed that bamboo particle composites (BPCs) do not show higher mechanical performances than the corresponding wood particles composites (WPCs), although bulk bamboo is much stronger than wood in mechanical performances. Herein this phenomenon was demonstrated from the cell compositions in the applied bamboo particles. To address that, a simple method to physically separate bamboo fibers (BFs) and bamboo parenchyma cells (BPs) from a bamboo particle mixture was developed. Polypropylene (PP) composites with pure BFs, BPs, a mixture of BFs and BPs (BFs + BPs), wood particles (WPs) as fillers were prepared. The flexural and dynamic mechanical properties, water absorption, and thermal properties were determined. The BF/PP composites showed the best mechanical performances (MOR at 35 MPa, MOE at 2.4 GPa), followed by WP/PP, (BF + BP)/PP, and BP/PP. They also exhibited the lowest water absorption and thickness swelling. Little difference was found for the thermal decomposition properties. However, a lower activation energy of BF/PP compared with BP/PP implied an uneven dispersion of BFs and weaker interfacial interaction between BF and PP. The results suggest that the mechanical performances and water resistance of bamboo particle/polymer composites can be significantly improved through cell separation. However, interface modification should be applied if higher performances of BF/PP composites are required.

scholarly journals The Rapid Chloride Migration Test in Assessing the Chloride Penetration Resistance of Normal and Lightweight Concrete

2021 ◽  
Vol 11 (16) ◽  
pp. 7251
Author(s):  
Jorge Pontes ◽  
José Alexandre Bogas ◽  
Sofia Real ◽  
André Silva
Keyword(s):  
Lightweight Concrete ◽  
Chloride Transport ◽  
Penetration Resistance ◽  
Chloride Penetration ◽  
Migration Test ◽  
Simple Method ◽  
Chloride Migration ◽  
Binder Ratio ◽  
Chloride Penetration Resistance ◽  
Water Binder Ratio

Chloride-induced corrosion has been one of the main causes of reinforced concrete deterioration. One of the most used methods in assessing the chloride penetration resistance of concrete is the rapid chloride migration test (RCMT). This is an expeditious and simple method but may not be representative of the chloride transport behaviour of concrete in real environment. Other methods, like immersion (IT) and wetting–drying tests (WDT), allow for a more accurate approach to reality, but are laborious and very time-consuming. This paper aims to analyse the capacity of RCMT in assessing the chloride penetration resistance of common concrete produced with different types of aggregate (normal and lightweight) and paste composition (variable type of binder and water/binder ratio). To this end, the RCMT results were compared with those obtained from the same concretes under long-term IT and WDT. A reasonable correlation between the RCMT and diffusion tests was found, when slow-reactive supplementary materials or porous lightweight aggregates surrounded by weak pastes were not considered. A poorer correlation was found when concrete was exposed under wetting–drying conditions. Nevertheless, the RCMT was able to sort concretes in different classes of chloride penetration resistance under distinct exposure conditions, regardless of the type of aggregate and water/binder ratio.

scholarly journals Test Study on Road Performance of Soils Stabilized by Liquid Stabilizer in Seasonally Frozen Regions

2012 ◽  
Vol 5 ◽  
pp. 310-315 ◽  
Author(s):  
Yao Chen ◽  
Yi Qiu Tan
Keyword(s):  
Water Resistance ◽  
Base Material ◽  
Road Construction ◽  
Penetration Resistance ◽  
Comprehensive Investigation ◽  
Test Study ◽  
Stabilized Soil ◽  
Road Performance ◽  
Modulus Of Resilience ◽  
Seasonally Frozen Regions

In seasonally frozen regions, road construction often suffers from low strength,lack of durability, etc. Improving the typical clay’s workability in Changchun with lime and the Base-Seal stabilizer (BS-100) shows promising results. A comprehensive investigation to assess the soil characteristics influence is undertaken, so as the lime and liquid stabilizer (BS-100) content on the physical properties of stabilized soils in seasonally frozen regions. The optimum mix proportions, unconfined compressive strength, splitting strength, modulus of resilience, freeze-thaw action, water resistance and penetration-resistance were outlined. By comparing with current specifications, the Base-Seal stabilized soil as base material has higher early strength, higher after-strength and better frost stability.The results can be applied in road construction in seasonally frozen regions.

Evaluation of some physical performance properties of ultrasonic seaming, conventional seaming and sealing adhesive tape on waterproof polyester knitted fabrics with polyurethane

2021 ◽  
pp. 004051752110388
Author(s):  
Ayşe Şevkan Macit ◽  
Bahar Tiber
Keyword(s):  
Water Permeability ◽  
High Water ◽  
The Other ◽  
Adhesive Tape ◽  
Water Penetration ◽  
Performance Property ◽  
Knitted Fabrics ◽  
Bursting Strength ◽  
Bending Property ◽  
Bending Length

Ultrasonic seaming has become an important issue in recent years due to its various features. In this study, waterproof polyester knitted fabrics with polyurethane coating were used and the bursting strength, bending property and water permeability property of ultrasonic seaming were examined by changing various parameters. Besides, the ultrasonic seaming method was compared to conventional seaming and adhesive tape application. It is observed that there were high water permeability values generally in ultrasonic seaming and also fabrics with no water penetration were seen in this method, although, in some ultrasonic seaming parameters, values are lower than adhesive tape sealed ones. On the other hand, the bursting strength values of the ultrasonically sewn fabrics are found to be comparable to conventional seam and sealing adhesive tape when the optimum seaming parameters are determined. Also, it can be said that for the bending property according to increasing bending length values in this method compared with the others, ultrasonic seaming may find more usage areas where fabric stiffness is more advantageous. It has been observed that it is important to determine the fabric and ultrasonic sewing parameters according to the required performance property.

scholarly journals Marine Aerosol Weathering of Mediterranean Calcarenite Stone: Durability of Ethyl Silicate, Nano Ca(OH)2, Nano SiO2, and Nanostructured Consolidating Products

2018 ◽  
Vol 64 (2) ◽  
pp. 73-89 ◽  
Author(s):  
Ainara Zornoza-Indart ◽  
Paula Lopez-Arce ◽  
Karima Zoghlami ◽  
Nuno Leal ◽  
Joaquim Simão
Keyword(s):  
Ethyl Silicate ◽  
Marine Aerosol ◽  
Nano Sio2 ◽  
Stone Durability

scholarly journals Assessment of phytomeliorative efficiency of Kochia scoparia (L.) schrad.

2019 ◽  
pp. 15-18
Author(s):  
Konstantin Evgenyevich Denisov ◽  
Petr Vladimirovich Tarasenko ◽  
Ilya Sergeevich Poletaev ◽  
Valentin Vasylyevich Zuev
Keyword(s):  
Sewage Sludge ◽  
Water Permeability ◽  
Water Resistance ◽  
Organic Fertilizers ◽  
Soil Density ◽  
Annual Grass ◽  
Kochia Scoparia ◽  
Southern Chernozem ◽  
Combined Action ◽  
High Doses

  Phytomeliorative efficiency of the annual grass Kochia scoparia (L.) schrad was assessed. The experiments were conducted on the solonetz of the southern chernozem. It was revealed that the application of high doses of sewage sludge (from 50 to 200 t / ha) contributed to an increase in the yield of green mass of Kochia scoparia by 133–362%. After the combined action of annual grass crops and organic fertilizers, the soil density decreased from 1.47 g / cm3 in the solonetz to 1.25 / cm3 in the variant with a dose of 200 t / ha, water resistance for three years of research increased by 37.8%, water permeability increased by more than 5 times.

Influence of Silane Treatment on the Freeze-Thaw Resistance of Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 565-568 ◽  
Author(s):  
Xiao Jian Gao ◽  
Hong Wei Deng ◽  
Ying Zi Yang
Keyword(s):  
Surface Treatment ◽  
Water Adsorption ◽  
Concrete Structures ◽  
Air Entrainment ◽  
Concrete Surface ◽  
Silane Treatment ◽  
Cold Regions ◽  
Bonding Force ◽  
Freeze Thaw ◽  
Surface Impregnation

The influences of silane impregnation on water adsorption, bonding force between ice and concrete surface and resistance to freeze-thaw of concretes were studied. Two strength grades (C30 and C50) and the air entrainment were considered for concrete preparation. The results show that surface impregnation with silane reduces the final water adsorption of concrete by more than 90% when compared with the untreated specimen. The silane treatment significantly decreases the bonding force between ice and concrete surface. The resistance to freeze-thaw of both new and old concretes can be improved by the silane treatment. Therefore, the surface treatment with silane is suggested as an effective method to improve the durability of concrete structures in cold regions.

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