Mathematical model to predict the chloride ion penetration and compressive strength of concrete incorporating GGBS

2021 ◽  
Author(s):  
Tarun Gehlot ◽  
Suresh Singh Sankhla ◽  
Sangeeta Parihar
Keyword(s):  
Mathematical Model ◽  
Compressive Strength ◽  
Chloride Ion ◽  
Chloride Ion Penetration ◽  
Compressive Strength Of Concrete ◽  
Ion Penetration

Experimental Study on Sustainable Concrete with the Mixture of Low Calcium Fly Ash and Lime as a Partial Replacement of Cement

2011 ◽  
Vol 250-253 ◽  
pp. 307-312 ◽  
Author(s):  
Muthuramalingam Jayakumar ◽  
M. Salman Abdullahi
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Chloride Ion ◽  
Apparent Volume ◽  
Partial Replacement ◽  
Fly Ash Concrete ◽  
Low Calcium ◽  
Chloride Ion Penetration ◽  
Ion Penetration

Even though the use of fly ash in concrete is nowadays a common practice, its relatively slow pozzolanic reactivity hinders its greater utilization; hence efficient methods of activation are on demand. This study was carried out to evaluate the influence of lime as a chemical activator on the mechanical and durability properties of high strength fly ash concrete. Mixtures were made with 0, 30, 40, and 50% of cement replaced by low calcium fly ash. Corresponding mixtures were also made with the same amount of fly ash and addition of 10% of lime to each mixture. For each concrete mixture, slump, compressive strength, water absorption, sorptivity, apparent volume of permeable voids, and resistance to chloride-ion penetration were measured. The results obtained showed that addition of lime improved the compressive strength significantly at all ages. The strength of all the fly ash mixtures containing lime surpassed that of the corresponding Portland cement mix at 60 days. Addition of lime also improved the sorptivity and resistance to chloride-ion penetration of the fly ash concrete. It however increases the water absorption and the volume of permeable voids of the fly ash concrete.

Influence of Slag Fineness on Durability of High-Performance Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3240-3243
Author(s):  
Hui Liu ◽  
Ping Li ◽  
Qiao Lan Jin
Keyword(s):  
Compressive Strength ◽  
Surface Area ◽  
Frost Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Ion ◽  
Penetration Resistance ◽  
Concrete Durability ◽  
Chloride Ion Penetration ◽  
Ion Penetration

This research focuses on investigating the high performance concrete durability containing slag with different fineness and dosage. For this purpose, the 28-day compressive strength, chloride ion penetration, and frost resistance were investigated, with slag surface area 420m2/kg, 530m2/kg, 610m2/kg, and 720m2/kg, and replacement percentage 0%, 20%, 40%, and 60%, respectively. It was found that chloride ion penetration resistance were affected by the fineness and dosage of slag, and concrete frost resistance property was mainly controlled by dosage of slag rather than the fineness, and the 28-day compressive strength increased with slag incorporation.

scholarly journals Influence of Palm Oil Fuel Ash and W/B Ratios on Compressive Strength, Water Permeability, and Chloride Resistance of Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Wachilakorn Sanawung ◽  
Tieng Cheewaket ◽  
Weerachart Tangchirapat ◽  
Chai Jaturapitakkul
Keyword(s):  
Compressive Strength ◽  
Palm Oil ◽  
Water Permeability ◽  
Chloride Ion ◽  
Palm Oil Fuel Ash ◽  
Chloride Ion Penetration ◽  
Chloride Resistance ◽  
Fuel Ash ◽  
Oil Fuel ◽  
Ion Penetration

This research studies the effects of W/B ratios and palm oil fuel ash (POFA) on compressive strength, water permeability, and chloride resistance of concrete. POFA was ground until the particles retained on sieve number 325 were less than 5% by weight. POFA was used to partially replace OPC at rates of 15, 25, and 35% by weight of binder. The water to binder (W/B) ratios of concrete were 0.40 and 0.50. The compressive strength, water permeability, and chloride resistance of concrete were investigated up to 90 days. The results showed that POFA concrete with W/B ratio of 0.40 had the compressive strengths ranging from 45.8 to 55.9 MPa or 82–94% of OPC concrete at 90 days, while POFA concrete with W/B ratio of 0.50 had the compressive strengths of 33.9–41.9 MPa or 81–94% of OPC concrete. Furthermore, the compressive strength of concrete incorporation of ground POFA at 15% was the same as OPC concrete. The water permeability coefficient and the chloride ion penetration of POFA concrete were lower than OPC concrete when both types of concrete had the same compressive strengths. The findings also indicated that water permeability and chloride ion penetration of POFA concrete were significantly reduced compared to OPC concrete.

Influence of Slag Fineness on High-Performance Concrete Properties

2012 ◽  
Vol 174-177 ◽  
pp. 286-290
Author(s):  
Hui Liu ◽  
Yuan Bao Leng ◽  
Wan Zeng Song ◽  
Sheng Bi
Keyword(s):  
Compressive Strength ◽  
Surface Area ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Ion ◽  
Penetration Resistance ◽  
Slag Surface ◽  
Concrete Properties ◽  
Chloride Ion Penetration ◽  
Ion Penetration

This research focuses on investigating the high performance concrete containing slag with different fineness and dosage. For this purpose, the workability, compressive strength at different ages, and chloride ion penetration were investigated, with slag surface area 420m2/kg, 530m2/kg, 610m2/kg, and 720m2/kg, and replacement percentage 0%, 20%, 40%, and 60%, respectively. It was found that the workability and chloride ion penetration resistance were affected by the fineness and dosage of slag. The 7-day compressive strength decreased with slag replacement increasing when the fineness of slag is lower than 530m2/kg, and 28-day and 56-day compressive strength increased; For the fineness higher than 530m2/kg, the 7-day compressive strength is higher than that of control concrete, when the slag replacement was 40%, the concrete reached the highest value, and the 28-day and 56-day compressive strength increased with slag incorporation.

scholarly journals Experimental Study on the Effect of Expansive Agent on the Durability of Concrete in Civil Air Defense Engineering

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Junbo Zhang ◽  
Jigang Zhang ◽  
Weiwei Xiao ◽  
Qianying Wang ◽  
Feng Shao
Keyword(s):  
Compressive Strength ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Air Defense ◽  
Free Chloride ◽  
Chloride Ion Penetration ◽  
Mix Proportion ◽  
Carbonation Resistance ◽  
Engineering Environment ◽  
Compressive Strength Of Concrete

In this study, the effect of 8% UEA the reason why the UEA content is 8% is as follows: the expansion agent content in the actual mix proportion of the project is 8%, which is selected in this test to fit the reality better. expansion agent on the compressive strength, chloride ion penetration resistance, and carbonation resistance of civil air defense concrete were studied by simulating the rapid carbonation and chloride solution immersion of concrete structure in coastal civil air defense engineering environment. The results of this study show that the early compressive strength of concrete decreased by adding the UEA expansion agent and was also affected by the curing time. Moreover, the addition of UEA expansion agent decreased the content of free chloride ions and calcium carbonate in concrete and reduced the early compressive strength of concrete.

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