Autogenous Shrinkage and Creep of Early-Age Cement-Based Materials: Multiscale Modeling With Experimental Identification and Verification

2007 ◽  
pp. 501-502
Author(s):  
Christian Pichler ◽  
Roman Lackner
Keyword(s):  
Multiscale Modeling ◽  
Autogenous Shrinkage ◽  
Early Age ◽  
Experimental Identification ◽  
Shrinkage And Creep ◽  
Cement Based Materials

scholarly journals Investigation of the early-age performance and microstructure of nano-C–S–H blended cement-based materials

2021 ◽  
Vol 10 (1) ◽  
pp. 1374-1382
Author(s):  
Wei He ◽  
Gang Liao
Keyword(s):  
Cement Paste ◽  
Pore Diameter ◽  
Autogenous Shrinkage ◽  
Blended Cement ◽  
Cement Matrix ◽  
Early Age ◽  
Early Hydration ◽  
Characterization Methods ◽  
Gradual Loss ◽  
Cement Based Materials

Abstract Nano calcium silicate hydrate (nano-C–S–H) has become a novel additive for advanced cement-based materials. In this paper, the effect of nano-C–S–H on the early-age performance of cement paste has been studied, and some micro-characterization methods were used to measure the microstructure of nano-C–S–H-modified cement-based material. The results showed that the initial fluidity of cement paste was improved after addition of nano-C–S–H, but the fluidity gradual loss increased with the dosage of nano-C–S–H. The autogenous shrinkage of cement paste can be reduced by up to 42% maximum at an appropriate addition of nano-C–S–H. The mechanical property of cement paste was enhanced noticeably after adding nano-C–S–H, namely, the compressive strengths were improved by 52% and 47.74% at age of 1 day and 7 days, respectively. More hydration products were observed and pore diameter of cement matrix was refined after adding nano-C–S–H, indicating that the early hydration process of cement was accelerated by nano-C–S–H. This was mainly attributed to seed effect of nano-C–S–H. The detailed relationship between microstructure and early-age performance was also discussed.

Early-Age Autogenous Shrinkage of High-Performance Concrete Columns by Embedded Fiber Bragg-Grating Sensor

2009 ◽  
Vol 419-420 ◽  
pp. 1-4 ◽  
Author(s):  
Ying Wei Yun ◽  
Ii Young Jang ◽  
Seong Kyum Kim ◽  
Seung Min Park
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
High Performance Concrete ◽  
Construction Material ◽  
Autogenous Shrinkage ◽  
Strain Sensor ◽  
Bragg Grating ◽  
Early Age ◽  
Long Time ◽  
Sensor Temperature

High-performance concrete (HPC) as a promising construction material has been widely used in infrastructures and high-rise buildings etc. However, its pretty high autogenous shrinkage (AS) especially in its early age becomes one of the key problems endangering long-time durability of HPC structures. This paper carried out the early age AS research of large scaled HPC column specimens by embedded Fiber Bragg-Grating (FBG) strain sensor. Temperature compensation for FBG strain sensor by thermocouple was also attempted in this paper, and the results were reasonable and acceptable comparing with the result compensated by FBG temperature sensor. Reinforcement influence, size effect and temperature effect on HPC AS were also analyzed respectively in this paper.

Study on autogenous shrinkage stress considering dependence on temperature in early age

2014 ◽  
pp. 663-667
Author(s):  
Jun-ichi Arai ◽  
Takahiro Ajichi ◽  
Toshiaki Mizobuchi
Keyword(s):  
Autogenous Shrinkage ◽  
Shrinkage Stress ◽  
Early Age

Device for Pore Solution Extraction from Cement-Based Materials and its Application

2016 ◽  
Vol 680 ◽  
pp. 365-369
Author(s):  
Jian Liang Zhang ◽  
An Qun Lu ◽  
Hua Li ◽  
Rui Wang ◽  
Wen Bin Wang ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Pore Solution ◽  
Early Age ◽  
Cement Pastes ◽  
Cement Based Materials ◽  
Different Ages ◽  
Low Rate ◽  
Relevant Factors

In this paper, a device for pore solution extraction from cement-based materials was presented, The relevant Factors of Efficiency of Pore Solution Extraction and the effects of squeezing pressures on the chemical concentrations of pore solutions were studied. The results shows, the efficiency of pore solution extraction can be effected by pressure values, squeezing duration, pressure maintaining time; A low rate of pressures loading is suitable for early-age cement pastes, and long-term samples can take larger rate; 30 minutes loading time can be adopted for specimens with all the different ages; no significant differences were observed regarding the chemical composition (Na and K) of the pore solution extracted between 300 and 900MPa.

Thermal properties of cement-based materials: Multiscale estimations at early-age

2018 ◽  
Vol 87 ◽  
pp. 205-219 ◽  
Author(s):  
Tulio Honorio ◽  
Benoit Bary ◽  
Farid Benboudjema
Keyword(s):  
Thermal Properties ◽  
Early Age ◽  
Cement Based Materials
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