Study on the Evaluation for Drying Shrinkage Properties of Coarse Aggregate

Yamada, Hiroshi; Katahira, Hiroshi; Watanabe, Hiroshi

doi:10.2208/jscejmcs.68.63

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…Recently, among the constituent materials of concrete, it has been reported that the type of coarse aggregate is one of the most dominant factors which affect drying shrinkage of concrete 1) . We have demonstrated that the mean value of the coarse aggregate drying shrinkage strain measured by using wire strain gauges and concrete drying shrinkage strain are high mutually related 2) .…”

Section: Introductionmentioning

confidence: 91%

Estimation for Drying Shrinkage of Concrete by Composite Model Using Coarse Aggregate Properties

Yamada

Katahira

Watanabe

2018

J. Soc. Mat. Sci., Japan

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The factors which affect drying shrinkage of concrete are material properties and environmental conditions, and so on. It is said that the type of coarse aggregate is one of the most dominant factors which affect concrete drying shrinkage. Therefore, it is important that the length-change properties of coarse aggregate particle are grasped when concrete drying shrinkage strain is estimated. Moreover, it is a practical benefit that concrete drying shrinkage strain is estimated by using coarse aggregate properties to be obtained the result early, regardless of the mix proportion of concrete. From the above backgrounds, in this research, we tried to estimate concrete drying shrinkage strain by composite model which has been proposed by KISHITANI & BABA, and investigated applicability of the model by using the initial tangent modulus or the secant modulus for coarse aggregate. For this study we used 19 types of crushed stone from different regions and of different qualities. As a result, the estimation of concrete drying shrinkage strain by KISHITANI & BABA equation was made different results of accuracy due to types of modulus of elasticity to be used for calculation. The calculated value against the experimental value was a range of-30 to +10% when using the initial tangent modulus, and was a range of-30 to +30% when using the secant modulus.

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Section: Introductionmentioning

confidence: 91%

Estimation for Drying Shrinkage of Concrete by Composite Model Using Coarse Aggregate Properties

Yamada

Katahira

Watanabe

2018

J. Soc. Mat. Sci., Japan

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“…Therefore it is believed that an understanding of the pore structure of coarse aggregate is important to identify coarse aggregate drying shrinkage properties. In our previous research 2) we have reported that when categorized by rock type there is a mutual relationship between the specific surface area of coarse aggregate as measured by using water vapor adsorption and the drying shrinkage strain of concrete.…”

Section: Introductionmentioning

confidence: 99%

“…In the past we have focused on the shrinkage properties of the coarse aggregate, investigating the validity of measuring the drying shrinkage strain using wire strain gauges. We have demonstrated that the mean value of the drying shrinkage strain of coarse aggregate measured by using wire strain gauges can serve as an index for estimating the drying shrinkage strain of concrete 2) .…”

Section: Introductionmentioning

confidence: 99%

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Study on Pore Structure of Coarse Aggregate and Drying Shrinkage Properties

Yamada

Katahira

Watanabe

2017

J. Soc. Mat. Sci., Japan

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The factors which affect drying shrinkage of concrete are material properties and environmental conditions, and so on. It is said that the type of coarse aggregate is one of the most dominant factors which affect concrete drying shrinkage. It has also been pointed out that the pore structure of coarse aggregate affects drying shrinkage strain of concrete. From the above backgrounds, in this research, we focused on the pore structure of pore radius of 1 µm or less for coarse aggregate and investigated the relationship between the coarse aggregate pore characteristics obtained by using mercury porosimetry and the drying shrinkage strain of coarse aggregate and concrete. For this study we used 10 types of crushed stone from different regions and of different qualities. As a result, we indicated a mutual relationship could be identified between the pore characteristics of coarse aggregate and the drying shrinkage strain of coarse aggregate or concrete when categorization by rock type was used. We also demonstrated that the average pore size of coarse aggregate, calculated from the pore characteristics obtained by using mercury porosimetry, was related to the drying shrinkage strain of coarse aggregate and concrete, and that it is possible that this relationship could be uniformly expressed by a power function.

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“…Hence, a simple estimation of aggregate quality to avoid excessive shrinkage and a concrete component designed to mitigate the shrinkage of concrete have been adopted as minimum countermeasures when fulfilling orders for concrete. A simple test using a wire strain gauge has previously been used to determine the drying shrinkage of aggregate [14,15]. The wire strain gauge method is fast, but needs improvement as a quality control measure because of some difficulties it faces in adhering to rock, limitations in specimen size, and possible uneven drying due to the watertight gauge cover and the anisotropy nature of the aggregate rock.…”

Section: Introductionmentioning

confidence: 99%