Specific surface area of aggregate and its relation to concrete drying shrinkage

Imamoto, Kei-ichi; Arai, Masanao

doi:10.1617/s11527-007-9245-x

Cited by 29 publications

(11 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Autogenous shrinkage is significant in high-strength concrete (i.e., low water-to-cement ratio concrete), whereas drying shrinkage is affected by the materials used and the environmental conditions. Aggregate type is a key factor that controls concrete shrinkage; some types increase shrinkage because of their own shrinkage (Carlson 1938;Hansen and Nielsen 1965;Hobbs 1974;Goto and Fujiwara 1979;Fujiwara 2008;Imamoto and Arai 2008).…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Beams: Concrete Volumetric Change Effects

Nakarai

Morito

Ehara

et al. 2016

ACT

View full text Add to dashboard Cite

Volumetric changes in concrete may affect the structural performance of reinforced concrete structures and their durability. It has been revealed that autogenous shrinkage of high-strength concrete decreases reinforced concrete beam's shear strength compared with low-shrinkage concrete. High-drying shrinkage of concrete may also decrease the shear strength of reinforced concrete beams using normal-strength concrete. In this study, the effects of drying shrinkage and expansion of normal-strength concrete on the shear strength of reinforced concrete beams with/without stirrups were investigated. Six concrete mix proportions, using different aggregates and admixtures, were used to control concrete volumetric changes. The used concrete showed a large range in volumetric change and high-shrinkage concrete caused shrinkage-induced cracking in the beams before loading. Loading test results showed that drying shrinkage and expansion decreased and increased the shear strength, respectively. The decrease or increase in measured shear strength as a result of volumetric changes was well reproduced by the proposed equation. The equation included the new concept of strain change in tension reinforcement caused by concrete shrinkage or expansion, which was proposed previously for autogenous shrinkage of high-strength concrete.

show abstract

Section: Introductionmentioning

confidence: 99%

Shear Strength of Reinforced Concrete Beams: Concrete Volumetric Change Effects

Nakarai

Morito

Ehara

et al. 2016

ACT

View full text Add to dashboard Cite

show abstract

“…A high degree of correlation has been found between the drying shrinkage and specific surface area of aggregate in fourteen types of concrete using different aggregates, leading researchers to point out the importance of aggregate properties (Imamoto and Arai 2008). Zhang et al (2013) investigated drying shrinkage strain of mortar and concrete using various types of aggregate and reported that the type of aggregate has a large influence on drying shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Drying Shrinkage of Concrete Affected by Aggregate Size

Maruyama

Sugie

2014

ACT

View full text Add to dashboard Cite

This paper describes new insights on the influence of aggregate size on drying shrinkage of concrete through numerical simulation. Using a two-dimensional finite element method, it is demonstrated that it is impossible to reproduce the impact of aggregate size on concrete drying shrinkage by simply considering crack opening in the mortar matrix. From this result, it is deduced that the effect of aggregate size on concrete shrinkage is influenced by aggregate surface area. The application of a constitutive law that considers the characteristics of ITZ to coarse aggregate elements successfully reproduced the damage and shrinkage strain of concretes with different aggregate sizes. A certain range of virtual ITZ pore thickness in the model was found to allow simulation of the real phenomenon. It is concluded that ITZ characteristics should be taken into account when considering aggregate behavior in drying concrete.

show abstract

“…8. In previous research (Imamoto and Arai 2007), the authors showed that there are discrepan- Sample cies among the sorption masses of aggregate between the R.H. constants of 32.5% and stepwise changes of 5% up to 32.5%. Further research is required to clarify the reason.…”

Section: Test Results and Discussionmentioning

confidence: 96%

“…Further research is required to clarify the reason. At any rate, the moisture sorption test using the R.H. constant of 32.5% with CaCl 2 is quite simple and makes it possible to obtain the apparent SSA of aggregate approximately 3 weeks more quickly than the stepwise R.H. sorption test (Imamoto and Arai 2007). Figure 9 shows the influence of the type of adsorbate on the measured SSAs of fine aggregates.…”

Section: Test Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified Evaluation of Shrinking Aggregate Based on BET Surface Area Using Water Vapor

Imamoto

Arai

2008

ACT

Self Cite

View full text Add to dashboard Cite

This paper deals with the evaluation of shrinking aggregate based on its specific surface area. The drying shrinkage strains of concretes with various types of aggregates were measured and their influences on the fundamental properties of the different types of aggregates were investigated. Furthermore, the specific surface areas (SSAs) of aggregates were obtained by the BET one point method using both nitrogen (N 2 ) and water vapor (H 2 O). The SSAs determined by using H 2 O exhibited higher values than those obtained by using N 2 . The drying shrinkage strains of concretes increased with increases of the aggregate SSAs with H 2 O. This finding will contribute the development of simplified testing method for the evaluation of shrinking aggregates.

show abstract

Specific surface area of aggregate and its relation to concrete drying shrinkage

Cited by 29 publications

References 17 publications

Shear Strength of Reinforced Concrete Beams: Concrete Volumetric Change Effects

Shear Strength of Reinforced Concrete Beams: Concrete Volumetric Change Effects

Numerical Study on Drying Shrinkage of Concrete Affected by Aggregate Size

Simplified Evaluation of Shrinking Aggregate Based on BET Surface Area Using Water Vapor

Contact Info

Product

Resources

About