Influence of water binder ratio on strength and acid resistance of concrete made up of mineral admixture as supplementary cementitious material

2020 ◽  
Vol 26 ◽  
pp. 796-803
Author(s):  
Sanjukta Sahoo ◽  
Trupti Ranjan Mahapatra ◽  
Neha Priyadarshini ◽  
Sanchita Mahapatra ◽  
Sital Naik ◽  
...  
Keyword(s):  
Acid Resistance ◽  
Cementitious Material ◽  
Mineral Admixture ◽  
Supplementary Cementitious Material ◽  
Influence Of Water ◽  
Binder Ratio ◽  
Water Binder Ratio

Study on High Amount Mineral Admixtures Concrete Performance

2013 ◽  
Vol 357-360 ◽  
pp. 667-670
Author(s):  
Zhi De Huang
Keyword(s):  
Chloride Ion ◽  
Cementitious Material ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Material System ◽  
Ion Permeability ◽  
Main Research ◽  
Binder Ratio ◽  
Marine Concrete ◽  
Water Binder Ratio

Depended on Qingdao Bay Bridge construction, large amount mineral admixture replacing cement has been conducted systematical research aiming at marine concrete, main control index is chloride ion permeability resistance. The main research contents concrete working, mechanical properties and chloride ion permeability resistance at low water binder ratio and large amounts mineral admixture. Measures and adjustment are proposed for marine concrete construction control and cementitious material system that using amount mineral admixtures and low water binder ratio.

Influence of the Fly-Ash Content of Concrete at Low Water-Binder Ratio on Hydration Degree of Binders and Cement

2011 ◽  
Vol 250-253 ◽  
pp. 445-449
Author(s):  
Li Wei Xu ◽  
Jian Lan Zheng
Keyword(s):  
Fly Ash ◽  
Temperature Rise ◽  
High Performance Concrete ◽  
Ash Content ◽  
Adiabatic Temperature ◽  
Mineral Admixture ◽  
Hydration Degree ◽  
Adiabatic Temperature Rise ◽  
Binder Ratio ◽  
Water Binder Ratio

The hydration degree of binders and cement is investigated by measuring the adiabatic- temperature rise of concrete at low water-binder ratio with different fly-ash content. The results denote that, with a constant water-binder ratio, both of the hydration degree of binders and that of cement decrease with the increasing fly-ash content in the early stage. In a later stage, however, the hydration degree of cement increases with the increasing fly-ash content and the hydration degree of binders peaks when the fly-ash content is 35%. Fly ash is one of the mineral admixture of which high-performance concrete is made up. It brings down the rise of concrete temperature significantly and helps solve the problems of shrinkage and crack of concrete structure. Because the hydration mechanism in common concrete is different from that in concrete with low water-binder ratio, and the hydration environment is different between concrete and cement pastes, to determine the adiabatic-temperature rise of concrete directly conforms to the actual situation. The adiabatic-temperature rise, adiabatic-temperature-rise rate, hydration degree of both binders and cement are investigated by measuring adiabatic-temperature rise of concrete with different fly-ash content.

Proportion Design of Autoclaved Cement Concrete Based on High Strength

2011 ◽  
Vol 391-392 ◽  
pp. 161-164
Author(s):  
Tie Quan Ni ◽  
Chang Jun Ke ◽  
Li Zhang
Keyword(s):  
Coarse Aggregate ◽  
High Strength ◽  
Orthogonal Test ◽  
Mineral Admixture ◽  
Mix Design ◽  
Hydration Reaction ◽  
Cement Concrete ◽  
Binder Ratio ◽  
Four Levels ◽  
Water Binder Ratio

According to the particularity of the autoclaved cement concrete that partial aggregate could participate in hydration reaction in the process of autoclaving, the optimal gradation of coarse aggregate and the optimal slurry aggregate ratio is studied, and the effect of water reducing agent for fluidity of cement paste is also studied. The optimized mix design of autoclaved cement concrete based on high strength (compressive strength and flexural strength) is done by orthogonal test with four factors (water-binder ratio, type of mineral admixture, amount and sand ratio) and four levels.

scholarly journals Study on Mechanical Properties of Concrete by Fractional Replacement of Cement with Metakaolin and Sand with M-Sand by Using M30 Grade

2021 ◽  
Vol 12 (2) ◽  
pp. 1835-1840
Author(s):  
B. Yellamanda Rao, Et. al.
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
High Strength ◽  
Amorphous Structure ◽  
Cementitious Material ◽  
Mineral Admixture ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Binding Properties ◽  
Supplementary Cementitious Material

Metakaolin (MK) is a mineral admixture, various tests are carried out on the usage of Metakaolin for the development of high strength concrete. MK is a supplementary cementitious material derived from heat treatment of natural deposits of kaolin. Metakaolin exhibits high pozzolana reactivity due to their amorphous structure and high surface area. Concrete is the most commonly used material for development of infrastructure. As infrastructure is growing there arises problems in repairs. Due to manufacture of cement, Co2gets emitted into environment. Researches started on working partial replacement of cement, which occur naturallyor manufactured. The different type of pozzolonic materials like metakaolin, silica fume, and fly ash etc, are the material have binding properties that of cement. The present study focuses on replacement cement with metakaolin by 0, 5, 10,15and 20% and fine aggregate with M-sand by 50%.

scholarly journals Influence of Concrete Mixture Composition on Acid Resistance of Concrete: A Review

2021 ◽  
Author(s):  
Chinnu Mariam Ninan ◽  
K P Ramaswamy ◽  
R Sajeeb
Keyword(s):  
Acid Resistance ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Concrete Mixture ◽  
Mixture Composition ◽  
Soluble Salts ◽  
Acid Attack ◽  
Related Factors ◽  
Binder Ratio ◽  
Water Binder Ratio

Cementitious materials are highly susceptible to rapid and severe degradation by a wide range of acids that are found immensely in ground water, sewage systems, industrial effluents, acid rain etc. which may cause microstructure deterioration. The factors influencing acid attack is generally categorised as material related factors and test related factors. Material related factors can be either related to acid solution or concrete mixture composition. Composition of concrete mixture greatly impacts the acid resistance of concrete. Factors related to composition of concrete mixture are type of cement, type and proportion of binders, water binder ratio, aggregate binder ratio and mineralogical nature of the aggregates. Even though the type of cement influences acid attack, the magnitude of variation is negligible. Consumption of calcium hydroxide and refinement of pore structure makes the use of supplementary cementitious materials favourable for acid resistance. Decrease in water binder ratio and increase in aggregate binder ratio reduces the porosity of concrete and thereby improves the acid resistance of concrete. Calcareous aggregates are preferred for concretes exposed to acids having less soluble salts and not preferred for acids forming soluble salts. This paper highlights the influence of composition of concrete mixture on acid resistance of concrete. A proper formulation of concrete is expected to enhance its acid resistance.

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.

Effects of Reducing Sodium Chloride Concentration on the Results of Coulomb Electric Flux

2011 ◽  
Vol 477 ◽  
pp. 388-392
Author(s):  
Ming Lu ◽  
Yi Bo Yang ◽  
Jia Cheng Li ◽  
Wen Ying Guo
Keyword(s):  
Sodium Chloride ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Test Method ◽  
Test Time ◽  
Nacl Solution ◽  
Influence Of Water ◽  
Binder Ratio ◽  
Electric Flux ◽  
Water Binder Ratio

For reducing the consumption and pollution of the sodium chloride (NaCl), the effect of reducing the NaCl concentration on the result of coulomb electric flux were studied. Three typical proportions of concrete and mortar were used to investigate the effects on the results of coulomb electric flux when the NaCl solution is from 3.0% to 1.0% and 0.5% by mass, respectively. The coulomb electric flux for 6h and 18h and chloride ion penetration depth for18h were studied in this experiment. The results are as followings: (1) it is a little effect on the 6h and 18h coulomb electric flux value of concrete and mortar to use1.0% by mass NaCl solution instead of 3.0% by mass NaCl solution, and the error is less than 5%. It was suitable to use 1.0% NaCl solution by mass. (2)The influence of water-binder ratio (W/B) and test time on coulomb electric flux is related to the porosity and pore connectivity. The lower the W/B, the smaller the coulomb electric flux is; the ratio of coulomb electric flux of 18h to that of 6h was about 2.8 ~ 3.0, and the ratio increases with the water-binder ratio. (3) It is not suitable to use the test results of mortar specimens to count the results of concrete specimens, but can use the results of mortar specimens to estimate the anti-chloride performance of different binder. The suggested test method is that using 0.5% or 1.0% by mass NaCl solution, water-binder ratio is 0.38 and binder-sand ratio is between 1:1.5 and 1:1.8. The best binder-sand ratio and other test parameter need to be determined by more research.

Effect of Water-Binder Ratio and Mineral Admixture on Frost Scaling Resistance of Concrete

2014 ◽  
Vol 881-883 ◽  
pp. 1212-1215 ◽  
Author(s):  
Zhong Hua Li ◽  
Hui Xu ◽  
Chao Su ◽  
Duo Zheng ◽  
Jia Liang Yang
Keyword(s):  
Fly Ash ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Loss Rate ◽  
Elasticity Modulus ◽  
Mineral Admixture ◽  
Salt Scaling ◽  
Binder Ratio ◽  
Scaling Resistance ◽  
Water Binder Ratio

In order to increase freeze-salt scaling resistance of concrete, effect of water-binder ratio, fly ash, slag and silica fume on freeze-salt scaling resistance are researched according to the CDF method. The results show that the scaled mass and the dynamic modulus of elasticity loss rate of the concrete are reduced with decreasement of water-binder ratio. When mineral admixture compound is added into concrete the scaled mass and the dynamic modulus of elasticity loss rate are also reduced. Compared with fly ash and slag the trend is more obvious as result of fume and slag added. The scaled mass and the loss rate of dynamic elasticity modulus are slightly reduced with decreasement of fly ash and slag. But the scaled mass and the loss rate of dynamic elasticity modulus are obviously reduced with increasement of silica fume and slag.

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