scholarly journals EFFECTS OF MIX PROPORTION ON ELECTRICAL RESISTIVITY OF CONCRETE WITH FLY ASH

2017 ◽  
Vol 7 (2) ◽  
pp. 53-65
Author(s):  
Su Wai Hnin ◽  
Pakawat Sancharoen ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Fly Ash ◽  
Chloride Penetration ◽  
Mix Proportion ◽  
Binder Ratio ◽  
Saturated Concrete ◽  
Paste Content ◽  
Water Saturated ◽  
Water Binder Ratio

The aim of this paper is to investigate the effects of mix proportion on electrical resistivity of concrete with fly ash. The electrical resistivity of concrete is measured by using four Wenner probes. The varied parameters in this study were water/binder ratio, fly ash content, and paste content. Electrical resistivity of water-saturated concrete at several different ages was studied and compared with compressive strength and rapid chloride penetration. Based on experimental results, a good relationship was obtained between results of compressive strength and rapid chloride penetration with electrical resistivity of concrete. The results of this study can be applied further to predict electrical resistivity of concrete when mix proportions are provided. According to the results, lower water/binder ratio concrete had higher resistivity than those with higher water/binder ratios. When cement was replaced at 40% by fly ash, electrical resistivity increased four times when compared to that of OPC concrete.

Effects of Concrete Mix Proportion on Electrical Resistivity of Concrete

2016 ◽  
Vol 866 ◽  
pp. 68-72 ◽  
Author(s):  
Su Wai Hnin ◽  
Pakawat Sancharoen ◽  
Somnuk Tangtermsirikul
Keyword(s):  
Compressive Strength ◽  
Electrical Resistivity ◽  
Fly Ash ◽  
Ionic Species ◽  
Ash Content ◽  
Curing Conditions ◽  
Mix Proportion ◽  
Concrete Mix ◽  
Binder Ratio ◽  
Paste Content

Electrical resistivity is one of the important parameters for modeling corrosion behavior of concrete. Few researchers have been carried out to investigate this problem. This paper presents an experimental study on effects of concrete mix proportion on electrical resistivity of concrete. The electrical resistivity of concrete is measured using the four Wenner probe, which is a fast and simple test that evaluates the resistance of concrete against the entrance of ionic species. The varied parameters in this study were water/binder ratio, fly ash content, cement paste content (Υ) and curing conditions. Based on experimental results, a good correlation is obtained between electrical resistivity and compressive strength of concrete.The results showed that the electrical resistivity of concrete mainly depend on compressive strength and fly ash content. The results of this study can be used further to model the behavior of electrical resistivity of concrete when the mix proportions are provided and that can be supported information to design sacrificial anode protection system.

Experimental Study on Workability and Strength of Green High Performance Concrete with High Volume Fly Ash

2013 ◽  
Vol 859 ◽  
pp. 52-55 ◽  
Author(s):  
Yong Qiang Ma
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
High Volume ◽  
Ash Content ◽  
Splitting Tensile Strength ◽  
Binder Ratio ◽  
Water Binder Ratio

A great deal of experiments have been carried out in this study to reveal the effect of the water-binder ratio and fly ash content on the workability and strengths of GHPC (green high performance concrete). The workability of GHPC was evaluated by slump and slump flow. The strengths include compressive strength and splitting tensile strength. The results indicate that the increase of water-binder ratio can improve the workability of GHPC, however the strengths of GHPC were decreased with the increase of water-binder ratio. When the fly ash content is lower than 40%, the increase in fly ash content has positive effect on workability of GHPC, while the workability begins to decrease after the fly ash content is more than 40%. The addition of fly ash in GHPC has adverse effect on the strengths, and there is a tendency of decrease in the compressive strength and splitting tensile strength of GHPC with the increase of fly ash content.

An Abrasion Damage of Fly Ash Concretes Previously Subjected to Scaling

2016 ◽  
Vol 258 ◽  
pp. 587-590
Author(s):  
Aneta Nowak-Michta
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Abrasion Resistance ◽  
Air Entrainment ◽  
Binder Ratio ◽  
Abrasion Damage ◽  
Water Binder Ratio ◽  
Class F

Effect of quantity and quality of fly ash and compressive strength of concretes with their addition on abrasion resistance previously subjected to scaling is analyzed in the paper. The abrasion resistance was measured in Böhme test according to EN 1338: 2005. The cement was replaced with 20, 35, and 50% of Class F siliceous fly ash in three categories of losses on ignition A, B and C by mass. The water-binder ratio, the air-entrainment and the workability of mixtures were maintained constant at 0.38, 4,5% and 150 mm respectively.Prior scaling causes a decrease in abrasion resistance of fly ash concretes. In addition, both quantitative and qualitative fly ash parameters and compressive strength have an influence on abrasion damage.

Application of Sulfoaluminate Cement for Solidification/Stabilization of Fly Ash from Municipal Solid Waste Incinerators

2012 ◽  
Vol 178-181 ◽  
pp. 795-798 ◽  
Author(s):  
Qi Na Sun ◽  
Jing Miao Li ◽  
Bao Quan Huo ◽  
Ji Bing Wang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
High Performance ◽  
Curing Time ◽  
Leaching Toxicity ◽  
Binder Ratio ◽  
Waste Incinerators ◽  
Water Binder Ratio

Sulfoaluminate cement (SAC) was utilized for the solidification/stabilization of fly ash from municipal solid waste (MSW) incinerators. The effects of fly ash amount and water/binder ratio were investigated on compressive strength and heavy metals leaching toxicity of solidified matrices at different curing times. The results showed that prolonged curing time, lower fly ash amount and water/binder ratio enhanced the compressive strength and decreased the leaching concentrations of Zn, Pb and Cu. For 28 days cured matrices with fly ash amount 50% and water/binder ratio 0.30, the compressive strength was 32.6 MPa and the leaching concentrations of Zn, Pb and Cu were 14.73, 0.75 and 0.43 mg/L respectively. The leaching concentrations of Zn, Pb and Cu met the demand of GB 5085.3-2007. SAC is proved to be effective for MSW incinerator fly ash solidification/stabilization and high performance matrices for disposal and reuse may be achieved with further formula optimization.

Research on Mix Proportion Design Method of Cement Concrete for Road Mixed with Antifreeze Admixtures Sealed in Capsules

2020 ◽  
Vol 861 ◽  
pp. 429-437
Author(s):  
Yang Zhao ◽  
Hong Fa Yu ◽  
Wei Dong Wang ◽  
Yue Li
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Design Method ◽  
Orthogonal Design ◽  
Ash Content ◽  
Material Content ◽  
Mix Proportion ◽  
Binder Ratio ◽  
Feeding Process ◽  
Water Binder Ratio

In order to explore the influence of a new mixed type antifreeze material on the flexural strength of concrete for road, the orthogonal design method was used to conduct experimental research on six factors including the water-binder ratio, the antifreeze material content, the fly ash content, the feeding process, the shape of the antifreeze material and the pre-absorption of antifreeze material. The influence degree of various factors on the flexural strength of concrete was studied, and the mixing ratio design method of concrete for road mixed with the antifreeze material was given. It was found that the water-binder ratio is the main factor affecting the strength of the concrete and that when the amount of antifreeze material is less than 15%, the effect on the strength is small. The influence of other factors on the strength is greatly influenced by the interaction of water-binder ratio. When it comes to the mix design, the content of gelling material is 500 kg/m3, and the water-binder ratio changes from 0.35 to 0.43 under different traffic levels. The recommended antifreeze material content and fly ash content is 10% and 15% respectively. It’s also suggested that the antifreeze material should be pre-absorbed, and the cement sand and stone be mixed before the antifreeze material is put into the mixing.

Influencing Factors of the Fluidity and Strength of Phosphate Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 464-468
Author(s):  
Hong Tao Wang ◽  
Ju Hui Cao ◽  
Shuang Mei Li ◽  
Ming Xue
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Retention ◽  
Natural Conditions ◽  
Slump Flow ◽  
Influence Of Water ◽  
Binder Ratio ◽  
Curing Methods ◽  
Early Strength ◽  
Water Binder Ratio

The influence of water binder ratio, content of borax and fly ash on the fluidity and strength of phosphate concrete were investigated. Results showed that the slump and slump flow of phosphate concrete improved with content of water and borax increasing. But the strength decreased, especially early strength. While the mixing amount of borax was less than 1.5% of the magnesium phosphate cement, the influence on later strength was relatively less. The fluidity decreased significantly and the cohesiveness and water retention improved while the content of fly ash was between 10% and 30%.The compressive strength increased while the content of fly ash was 10%.The better curing methods was curing in the natural conditions, the compressive increased with the age prolonged.

Theoretical and Experimental Research on Compressive Strength of High Fly-Ash Content Concrete

2011 ◽  
Vol 477 ◽  
pp. 257-262 ◽  
Author(s):  
Hong Mei Ai ◽  
Li Jiu Wang ◽  
Jing Wei ◽  
Jun Ying Bai ◽  
Pu Guang Lu
Keyword(s):  
Growth Rate ◽  
Compressive Strength ◽  
Fly Ash ◽  
Ash Content ◽  
Theoretical Formula ◽  
Term Strength ◽  
Single Factor ◽  
Binder Ratio ◽  
Water Binder Ratio

Introduced the concept of “Cementitious Coefficient” of fly ash, theoretical formula of strength of HFCC at a certain age was found with two variables: actual water-binder ratio and micro-aggregate-binder ratio. Development regularity of compressive strength of HFCC was studied and formula of long-term strength coefficient D28t was settled. Influence of actual water-binder ratio and micro-aggregate-binder ratio on long-term strength of HFCC was analyzed. Experimental results showed that along with the single-factor increase of actual water-binder ratio and micro-aggregate-binder ratio, growth rate of long-term strength of HFCC increased; influence of actual water-binder ratio was deeper than that of micro-aggregate-binder ratio.

scholarly journals The effect of water binder ratio on strength development of class C fly ash geopolymer mortar prepared by dry geopolymer powder

2019 ◽  
Vol 258 ◽  
pp. 05032 ◽  
Author(s):  
Arie Wardhono
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Calcium Content ◽  
Strength Properties ◽  
Strength Development ◽  
Effect Of Water ◽  
High Calcium ◽  
Binder Ratio ◽  
Geopolymer Binder ◽  
Water Binder Ratio

The use of geopolymer binder as cement replacement material can reduce the amount of carbon dioxide gas produced during the Portland Cement manufacturing process. However, the main issue of geopolymer binder is in the mixing process of sodium silicate and NaOH which requires specialized knowledge and strict supervision. This paper reports the effect of water binder ratio on strength development of fly ash geopolymer mortar using dry geopolymer powder. Fly ash with high calcium content was used as primary material. The dry geopolymer powder was prepared by wet mixing method which was made by drying a mixture of NaOH solution and limestone for 24 hours. The variations of water to binder ratio were 0.30, 0.35, 0.40, 0.45, and 0.50. Strength properties were measured by compressive strength at the age of 7, 14 and 28 days. The results showed that the water binder ratio significantly affect the strength development of geopolymer mortar prepared by dry geopolymer powder. The water binder ratio of 0.40 gives the highest compressive strength of 10.3 MPa at 28 days. This suggests that the use of dry geopolymer powder on geopolymer mortar production can overcome the difficulties of geopolymer mortar mixing on site.

Effect of Water-Binder Ratio and Complex Organic-Mineral Additive on Properties of Concrete for Marine Hydrotechnical Constructions

2019 ◽  
pp. 11-21 ◽  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Large Scale ◽  
Concrete Mixture ◽  
Free Calcium ◽  
Relative Deformation ◽  
Regression Equations ◽  
Binder Ratio ◽  
Water Binder Ratio ◽  
Modifying Additive

Large-scale construction of marine structures in the coastal and offshore areas of Vietnam requires the development of new compositions of hydrotechnical concrete and innovative technologies for the preparation of concrete mixes, as well as their transportation to the place of placement. A preliminary composition of heavy concrete was determined and its properties were studied. The effect of the water-binder ratio (W/B) and the effect of using the developed complex organo-mineral modifying additive consisting of fly ash (FA) of Vung Ang TPP, microsilica SF-90 (SF90) and polycarboxylate superplasticizer SR 5000F (SP) on the concrete properties. To process the obtained results, the method of mathematical planning of the experiment with the construction of a four-factor plan was used. As a result of the studies conducted, first-order regression equations were obtained depending on the objective functions - the mobility of the concrete mixture on the cone sediment, the compressive strength of concrete and the deformations of concrete on input factors - x1 (W/B), x2 (amount of SP), x3 (amount of FA) and x4 (amount of SF90). From the obtained regression equations, it follows that the water-binder ratio, as well as the content of superplasticizer, fly ash and microsilica in the composition of the additive have a significant impact on the mobility of concrete mixtures. When reducing W/B and the amount of FA, as well as the increase in the amount of SF90 (x4) concrete compressive strength in 28 days also increases. The result of this study showed the relative deformation of concrete also increases with an increase in the content of FA and reducing W/B and the amount of SF90. At the same time, the effect of the water-binder relationship is most pronounced. It can be assumed that, in the composition of the developed modifying additive, the particles FA and SF90 played the role of a kind of “sliding bearings” between the grains of cement, with which you can control the dispersion of cement and finely dispersed mineral grains in the concrete mixture, and hence its mobility and persistence construction sites in the coastal areas of Vietnam. In addition, SF90, containing 91.65% of amorphous silica, binds free calcium hydroxide to less soluble low-basic calcium silicate silicates, compresses the structure of concrete and increases its compressive strength.

Calculation Model of Compressive Strength of High Fly-AshContent Concrete at Specific Age

2011 ◽  
Vol 261-263 ◽  
pp. 361-365
Author(s):  
Hong Mei Ai ◽  
Jing Wei ◽  
Pu Guang Lu ◽  
Jun Ying Bai
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Calculation Model ◽  
Strength Calculation ◽  
Specific Design ◽  
Design Strength ◽  
Binder Ratio ◽  
Water Binder Ratio

Cementitious coefficient βtwas introduced to reflect the comprehensive effect of fly-ash quality on HFCC strength. On the basis of βt, actual water-binder ratio [W/(C+βtF)] and ash-binder ratio K was proposed, and the strength calculation model of HFCC with specific design age was established. On the basis of economy principal, the formula to determine K was founded. Influence of the design strength of HFCC and βt on K and the content of fly ash was analyzed.

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