Autogenous shrinkage of high-strength concrete containing silica fume under drying at early ages

Yang, Yang; Satō, Ryōichi; Kawai, Kenji

doi:10.1016/j.cemconres.2004.06.006

Cited by 99 publications

(38 citation statements)

References 3 publications

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“…The strain gauge was 60 mm in length and 4 mm in diameter. A similar method has been applied elsewhere (Yang et al 2005). The I shape of the strain gauge improves the mechanical link between the gauge and the concrete.…”

Section: Acoustic Emission Testmentioning

confidence: 99%

Detection of Microcracking in Concrete Subjected to Elevated Temperature at Very Early Age by Acoustic Emission

Son

Hosoda

2010

ACT

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Microcracks developed considerably in concrete subjected to elevated temperature up to around 60 o C at early ages, especially in low water-to-binder ratio (0.3) concrete. Microcracking was attributed to the stresses induced by the incompatibility in deformation between mortar and aggregate. Differences of coefficients of thermal expansion (CTE) between mortar and coarse aggregate, autogenous shrinkage of mortar and size of coarse aggregate were important factors influencing deterioration. The tensile strength of concrete was severely affected by the extent of microcracks. Concrete using ground granulated blast furnace slag (GGBFS) suffered worse damage than concrete prepared from ordinary Portland cement alone. Attempts were made to apply the acoustic emission (AE) technique to study the process and mechanism of microcracking. The skills required to practice the AE technique at early ages and at high temperature were carefully considered. AE hits agreed with the test results for deformation and tensile strength. Most of the microcracks occurred within the descending period of temperature and were classified into tensile mode. The use of coarse aggregate with larger CTE, saturated fine lightweight aggregate, and the reduction of the maximum size of the aggregate were greatly effective in reducing microcracking and improving the tensile strength of concrete made with GGBFS. Direct tensile strength was more adversely affected by microcracking than splitting tensile strength.

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Section: Acoustic Emission Testmentioning

confidence: 99%

Detection of Microcracking in Concrete Subjected to Elevated Temperature at Very Early Age by Acoustic Emission

Son

Hosoda

2010

ACT

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“…It is considered that the principle of superposition of autogenous shrinkage and drying shrinkage is applicable to the total concrete shrinkage. However, it has been demonstrated that the autogenous shrinkage in drying conditions is smaller than the autogenous shrinkage of sealed specimens (Yang et al 2005;Ishida et al 1998). This brings into question the principle of superposition of autogenous and drying shrinkage.…”

Section: Introductionmentioning

confidence: 92%

Autogenous Shrinkage and Expansion Related to Compressive Strength and Concrete Composition

Marušić

Štirmer

2016

ACT

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An extensive research was undertaken in order to determine the dependence of shrinkage of high and normal strength concrete on the compressive strength and concrete composition. The part of research concerning dependence of autogenous shrinkage on compressive strength is presented in this paper. Ten groups of concrete, with the total of twenty nine mixtures, were prepared. Concrete mixtures of each individual group were made using the same quantity of water, while the quantity of cement (CEM II/A-S 42,5R) and mineral admixture (silica fume) was varied in each group. Concrete groups differed according to the quantity of water. Autogenous shrinkage of concrete was monitored together with the influence of initial curing in water on concrete shrinkage. Initial autogenous expansion was noticed during testing autogenous shrinkage, especially on normal strength concrete. Based on the analysis of experimental results, the dependence of autogenous shrinkage at one day of concrete age on compressive strength was defined. The dependence of autogenous shrinkage at later ages on compressive strength of concrete was also presented. Finally, the autogenous shrinkage components of best-known theoretical shrinkage prediction models were compared with experimental data.

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“…shows the measured TEC history and the corrected TEC history. The high TEC values observed at the early ages correspond to the time when the water phase dominates (Loukili et al (2000) and Yang et al(2005)). The TEC decreases slowly and, approximately 6.8 hours after casting, decreases more rapidly.…”

Section: Thermal Expansion Coefficientmentioning

confidence: 99%

Hydration Heat and Autogenous Shrinkage of High-Strength Mass Concrete Containing Phase Change Material

Kim

Lee

Kim

et al. 2010

Journal of Asian Architecture and Building Engineering

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In this study, to reduce the HHV of the high-strength mass concrete at early ages, PCM that could absorb the occurred hydration heat was applied, and the changes of autogenous shrinkage and the relationship between the hydration temperature and autogenous shrinkage were investigated. The addition of the PCM leads to a decrease of the fluidity and an increase of the air content in concrete. The acceleration of the cement hydration process by the PCM leads to an early setting and a higher development of the compressive strength and elastic modulus of concrete at very early ages. The function of PCM could be worked below the original melting point due to the eutectic effect. While the hydration temperature and HHV of high-strength mass concrete can be decreased with the use of the PCM. A close relationship could be found between the hydration temperature and autogenous shrinkage; the higher the HHV, the higher the ASV and the greater the ultimate autogenous shrinkage.

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Autogenous shrinkage of high-strength concrete containing silica fume under drying at early ages

Cited by 99 publications

References 3 publications

Detection of Microcracking in Concrete Subjected to Elevated Temperature at Very Early Age by Acoustic Emission

Detection of Microcracking in Concrete Subjected to Elevated Temperature at Very Early Age by Acoustic Emission

Autogenous Shrinkage and Expansion Related to Compressive Strength and Concrete Composition

Hydration Heat and Autogenous Shrinkage of High-Strength Mass Concrete Containing Phase Change Material

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