Study on Compressive Strength Development of Concrete With Type-Ii Fly-Ash in Standard Curing

Funamoto, Kenji

doi:10.3130/aijt.15.627

Cited by 5 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As well, prediction models are proposed to estimate the strength development of high volume FA concrete by Hwang et al [9] and other researchers [10,11]. Besides, Funamoto [12] suggests a coefficient for the formula given in CEB-FIP 1990 model code in order to predict the strength development of FA concrete. The main object of his research was the FA replacement of from 15% to 30%.…”

Section: Review Of Previous Studies Dealing With Fa Concretementioning

confidence: 99%

Proposal of a Simplified Prediction Formula for Compressive Strength of Fly Ash Concrete

Zhang

Yoshitake

Saitoh

2011

AMR

View full text Add to dashboard Cite

To propose a prediction formula of compressive strength of concretes containing fly ash (FA concrete), over 1600 strength data are collected from previous studies and discussed in this study. In particular, the study focuses on developing strengths of FA concrete. The study deals with test data of concrete with wide range of FA replacement, namely 0-50% by mass of cement. Compressive strength at age of 7 days has strongly relation to the cement-water ratio, so the strength can be predicted by using only water and cement contents. In addition, early age strengths within 7 days can be estimated by using the Goral curve based on strength ratio. Strength after the age of 7 days can be predicted by using replacement ratio of fly ash because the strength ratios are proportional to the replacement ratio. Based on the findings, a simplified formula for predicting compressive strength at various ages is proposed in the paper.

show abstract

Section: Review Of Previous Studies Dealing With Fa Concretementioning

confidence: 99%

Proposal of a Simplified Prediction Formula for Compressive Strength of Fly Ash Concrete

Zhang

Yoshitake

Saitoh

2011

AMR

View full text Add to dashboard Cite

show abstract

“…The main reasons are as follows. (1) The quality of fly ash is unstable because the quality of fly ash changes greatly with that of coals [ 11 , 12 ]; (2) there is lower early age compressive strength of concrete due to lower activity of fly ash [ 13 , 14 ]; (3) pozzolanic reaction of fly ash leads to decreased pH value of concrete, which results in a poor carbonation resistance [ 15 – 17 ]. In addition, in order to ensure the resistance of freezing-thawing action, it is necessary to entrain a certain amount of air in the concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Durability Improvement of Fly Ash Concrete with Durability Improving Admixture

Quan

Kasami²

2014

The Scientific World Journal

View full text Add to dashboard Cite

In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%–20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized.

show abstract

“…Although more than 5 million tons of fly ash is generated from coal burning power stations in a year in Japan, the use of fly ash in concrete is still limited, because of difficulty in quality control of air-entraining fly ash concrete [1][2][3][4]. Japanese Industrial Standard, JIS A 6201, 'Fly ash for Use in Concrete' [5], specifies 4 types of fly ash depending on fineness, ignition loss, flow value ratio and activity factor as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Change in Fineness of Fly Ash on Air-Entraining Concrete

Quan¹

2011

TOCIEJ

View full text Add to dashboard Cite

Abstract:Although the specific surface area of type-2 fly ash, specified to be not less than 250 m 2 /kg in Japanese Industrial Standard, type-2 fly ash manufactured and available range from 300 m 2 /kg to 450 cm 2 /kg in Japan. In order to make clear of the effects of change in fineness of fly ash on the properties of air-entraining concrete, 2 series of laboratory experiments were carried out using 6 kinds fly ash with the specific surface area in the range from 250 m 2 /kg to 440 m 2 /kg. In the series 1 experiment, mix proportion was the same for 6 mixtures of fly ash, regardless of the change in fly ash properties. Water binder ratio, unit binder content, fly ash replacement ratio and unit water content were constant for all mixtures as well as the dosage of chemical admixture. In the series 2 experiment, 5 mixtures of concrete with the same materials, with the same unit binder content, with the same fly ash replacement ratio and with the same water binder ratio as those in the series 1 experiment were examined. However, unit water content and dosage of air-entraining agent were adjusted to obtain target slump and target air content. The test results indicated higher slump and lower air content and higher dosage of air-entraining agent for fly ash with higher specific surface area than those with lower specific surface area. Compressive strength was found to increase with the increases of specific surface area of fly ash, while drying shrinkage and carbonation were found to show different tendency with change in fineness of fly ash.

show abstract

Study on Compressive Strength Development of Concrete With Type-Ii Fly-Ash in Standard Curing

Cited by 5 publications

References 2 publications

Proposal of a Simplified Prediction Formula for Compressive Strength of Fly Ash Concrete

Proposal of a Simplified Prediction Formula for Compressive Strength of Fly Ash Concrete

Experimental Study on Durability Improvement of Fly Ash Concrete with Durability Improving Admixture

The Effects of Change in Fineness of Fly Ash on Air-Entraining Concrete

Contact Info

Product

Resources

About