Restrained shrinkage stress development and stress relaxation in low W/B mortars containing ultrafine fly ash

2008 ◽  
pp. 715-721
Author(s):  
Akhter Hossain ◽  
Herb Bullock ◽  
Anushka Fonseka
Keyword(s):  
Fly Ash ◽  
Stress Relaxation ◽  
Shrinkage Stress ◽  
Restrained Shrinkage ◽  
Stress Development

scholarly journals Numerical Modelling of Field Test for Crack Risk Assessment of Early Age Concrete Containing Fly Ash

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
G. M. Ji ◽  
T. Kanstad ◽  
Ø. Bjøntegaard
Keyword(s):  
Fly Ash ◽  
Wall Structure ◽  
Early Age ◽  
Measured Temperature ◽  
Finite Element Program ◽  
Stress Development ◽  
Thermal Dilation ◽  
Early Age Concrete ◽  
Mineral Additives ◽  
Cracking Risk

The high-strength/high-performance concretes are prone to cracking at early age due to low water/binder ratio. The replacement of cement with mineral additives such as fly ash and blast-furnace slag reduces the hydration heat during the hardening phase, but at the same time, it has significant influence on the development of mechanic and viscoelastic properties of early age concrete. Its potential benefit to minimize the cracking risk was investigated through a filed experiment carried out by the Norwegian Directorate of Roads. The temperature development and strain development of the early age concrete with/without the fly ash were measured for a “double-wall” structure. Based on experimental data and well-documented material models which were verified by calibration of restraint stress development in TSTM test, thermal-structural analysis was performed by finite element program DIANA to assess the cracking risk for concrete structures during hardening. The calculated and measured temperature and strain in the structure had good agreement, and the analysis results showed that mineral additives such as flay ash are beneficial in reducing cracking risk for young concrete. Furthermore, parameter studies were performed to investigate the influence of the two major factors: creep and volume change (autogenous shrinkage and thermal dilation) during hardening, on the stress development in the structure.

Analytical model predicting the concrete tensile stress development in the restrained shrinkage ring test

2021 ◽  
Vol 307 ◽  
pp. 124930
Author(s):  
Yingda Zhang ◽  
Sumaiya Afroz ◽  
Quang Dieu Nguyen ◽  
Taehwan Kim ◽  
Johanna Eisenträger ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Analytical Model ◽  
Ring Test ◽  
Restrained Shrinkage ◽  
Stress Development

scholarly journals Novel dental restorative materials having low polymerization shrinkage stress via stress relaxation by addition-fragmentation chain transfer

2012 ◽  
Vol 28 (11) ◽  
pp. 1113-1119 ◽  
Author(s):  
Hee Young Park ◽  
Christopher J. Kloxin ◽  
Ahmed S. Abuelyaman ◽  
Joe D. Oxman ◽  
Christopher N. Bowman
Keyword(s):  
Stress Relaxation ◽  
Chain Transfer ◽  
Shrinkage Stress ◽  
Polymerization Shrinkage ◽  
Dental Restorative Materials ◽  
Restorative Materials ◽  
Dental Restorative

Optimized Ultra High Performance Fiber Reinforced Concrete Mixture with Intensified Volumetric Stability

2014 ◽  
Vol 627 ◽  
pp. 389-392
Author(s):  
Jung Jun Park ◽  
Doo Yeol Yoo ◽  
Jun Hyoung Park ◽  
Sung Wook Kim
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Shrinkage Strain ◽  
Strength Criterion ◽  
Fiber Reinforced Concrete ◽  
Shrinkage Stress ◽  
Restrained Shrinkage ◽  
Fiber Reinforced ◽  
Design Strength ◽  
High Performance Fiber

This study performed compressive, tensile and restrained shrinkage tests to find out the optimized mixture including shrinkage reducing admixture (SRA) and expansive admixture (EA) enabling to reduce the shrinkage of Ultra High Performance Fiber Reinforced Concrete (UHPFRC). The test results showed that the mixture using 1% of SRA and 7.5% of EA satisfied the design strength criterion despite of slight loss in the compressive and tensile strengths. In addition, this mixture exhibited the lowest restrained shrinkage strain by offsetting the quick setting and delaying the development of the restrained shrinkage stress.

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