Hydration Heat and Autogenous Shrinkage of High-Strength Mass Concrete

Kim, Gyu-Yong; Lee, Euibae; Koo, Kyung-Mo

doi:10.3130/jaabe.8.509

Cited by 8 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The values for peak temperature, peak time and initial temperature are seen in Table 4. High cement content of concrete contribute to the high hydration temperature [33]. M15SP1.5 and MK15SP2 concretes recorded the lowest temperature peak with values of 35.70 o C at 14 hrs and 36.50 o C at 18 hrs after casting respectively.…”

Section: Compressive Strengthmentioning

confidence: 96%

Compressive Strength, Temperature Performance and Shrinkage of Concrete Containing Metakaolin

A. Mansour,

Ismail,

A. Majid

et al. 2023

IJIE

View full text Add to dashboard Cite

The influence of metakaolin (MK) on concrete was investigated as a partial replacement of cement, which is liable for high content of CO2 emission during the manufacturing process. The study aimed to assess the compressive strength, temperature performance and drying shrinkage of MK blended concrete. Different ratios of MK (5%, 10%, and 15%) as cement replacement, and two ratios of superplasticizer (SP), 1.5%, and 2% as cement weight were utilized in this study. The results indicated that using MK increased the compressive strength at 28¬ day. The improvement of strength is ascribed to the pozzolanic reaction and the packing effect of fine MK particles. MK blended concrete experienced a decrease in the temperature rise of heat of hydration (HOH) and low drying shrinkage when compared to the control concrete. The SP ratio does not have significant effect on the temperature of the concrete mixtures: however, using 1.5% SP slightly reduces the drying shrinkage of MK blended concrete compared to 2% SP. In conclusion, Incorporation of MK as partial cement substitute enhances the concrete strength, thus various types of concrete can be produced. Low temperature and drying shrinkage of MK blended concrete help in reducing thermal crack after casting process.

show abstract

Section: Compressive Strengthmentioning

confidence: 96%

Compressive Strength, Temperature Performance and Shrinkage of Concrete Containing Metakaolin

A. Mansour,

Ismail,

A. Majid

et al. 2023

IJIE

View full text Add to dashboard Cite

show abstract

“…It greatly reduced the 90-day Figure 10 shows that the inclusion of NLS reduced the autogenous shrinkage of the FA1.2-2% mixtures. This was due to the inclusion of NLS-retarded cement hydration [71], which reduced the hydration heat and the autogenous shrinkage [72]. The 90-day autogenous shrinkage of the FA1.2-2% mixtures ranged between 300 µ and 650 µ when the dosage of NLS was 0-2%.…”

Section: Autogenous Shrinkage Of Eccmentioning

confidence: 99%

Influences of Sodium Lignosulfonate and High-Volume Fly Ash on Setting Time and Hardened State Properties of Engineered Cementitious Composites

et al. 2021

View full text Add to dashboard Cite

Engineered Cementitious Composites (ECC) exhibit high ductility accompanied by multiple narrow cracking behavior under uniaxial tension. The study experimentally investigated the influence of sodium lignosulfonate and high volumes of fly ash (HVFA) on the properties of fresh and hardened ECC, with the experimental variables including the amounts of fly ash, polyvinyl alcohol (PVA) fibers, and sodium lignosulfonate. The test results were discussed extensively in terms of the initial and final setting times, compressive and tensile behavior, and drying and autogenous shrinkage. The results indicated that the initial and final setting times of ECC were increased along with the sodium lignosulfonate content of up to 1%. The drying shrinkage development was governed by the first 14 days. In addition, the major autogenous shrinkage developed for more than 28 days. The amounts of fly ash, PVA fibers, and sodium lignosulfonate considerably impacted the autogenous shrinkage. Moreover, it was found that the dosage of sodium lignosulfonate at 0.5% of the weight of Portland cement optimally reduced the shrinkage and enhanced the tensile strain capacity for ECC.

show abstract

“…The heat of hydration is influenced by the type of mix and the size of the concrete. Some researchers have studied autogenous shrinkage for mass concrete (Kim et al 2009), and dams (Zhao et al 2021;Kim 2010), but not many have studied it for full-scale beam. There is a close relationship between heat of hydration and autogenous shrinkage at an early age, especially between HHV (hydration heating rate) and ASV (autogenous shrinkage rate).…”

Section: Introductionmentioning

confidence: 99%

“…The higher the HHV, the higher the ASV, and the greater the autogenous shrinkage. Thermal deformation is calculated using the thermal expansion coefficient (TEC) corrected by the maturity method, and subtracted from the total measured deformation (Kim et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Hydration Heat to Autogenous Shrinkage in Full-Scale High-Performance Concrete Beams

2023

CER

View full text Add to dashboard Cite

High-performance concrete is more susceptible to cracking at an early age. During hydration, various forces come into play, including heat generated by hydration, forces driving the growth of hydration products, and forces contributing to the reduction of pore number and size. Heat hydration is one of the things highlighted as the cause. The investigation of full-scale beam hydration heat aims to address the challenge of producing crackfree HPC. This research was carried out experimentally on full-scale prestressed beams measuring 2006003000 (mm) with a compressive strength (fc') of 60 MPa. Shrinkage and temperature in the concrete were measured using vibrating wire-embedded strain gauges. Four gauges were installed at 1030 mm from each end, and another four were placed in the middle of the beam. After casting, the beam were immediately covered with burlap sacks to keep them consistently moist. Strain and temperature observations were recorded every 15 minutes starting immediately after casting. Eight autogenous shrinkage phenomena were identified in full-scale beams. Phenomena 1 and 6 showed no sensitivity to hydration heat release. Phenomenon 1 occurred within the first 3 hours, during which the surrounding temperature still influenced the concrete temperature. Phenomenon 6 took place at 20.5-20.7 hours, indicating a sudden jump in autogenous shrinkage not accompanied by heat of hydration. The critical period, from age 9.5 to 16 hours, sees the highest values of temperature and shrinkage in the concrete. At this time the beams can be given special treatment. A growth sketch of the hydration product has been proposed.

show abstract

Hydration Heat and Autogenous Shrinkage of High-Strength Mass Concrete

Cited by 8 publications

References 9 publications

Compressive Strength, Temperature Performance and Shrinkage of Concrete Containing Metakaolin

Compressive Strength, Temperature Performance and Shrinkage of Concrete Containing Metakaolin

Influences of Sodium Lignosulfonate and High-Volume Fly Ash on Setting Time and Hardened State Properties of Engineered Cementitious Composites

Sensitivity of Hydration Heat to Autogenous Shrinkage in Full-Scale High-Performance Concrete Beams

Contact Info

Product

Resources

About