Resistance of fly ash-Portland cement blends to thermal shock

Pyatina, Tatiana; Sugama, Toshifumi

doi:10.1680/adcr.15.00030

Resistance of fly ash-Portland cement blends to thermal shock

Journal Article · Fri Sep 11 00:00:00 EDT 2015 · Advances in Cement Research

DOI:https://doi.org/10.1680/adcr.15.00030· OSTI ID:1232687

Pyatina, Tatiana ^[1]; Sugama, Toshifumi ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)

Thermal-shock resistance of high-content fly ash-Portland cement blends was tested in the following ways. Activated and non-activated blends with 80-90 % fly ash F (FAF) were left to set at room temperature, then hydrated for 24 hours at 85°C and 24-more hours at 300°C and tested in five thermal-shock cycles (600°C heat - 25°C water quenching). XRD, and thermal gravimetric analyses, along with calorimetric measurements and SEM-EDX tests demonstrated that the activated blends form more hydrates after 24 hours at 300°C, and achieve a higher short-term compressive strength than do non-activated ones. Sodium meta-silicate and sodaash engendered the concomitant hydration of OPC and FAF, with the formation of mixed crystalline FAF-OPC hydrates and FAF hydrates, such as garranite, analcime, and wairakite, along with the amorphous FAF hydration products. In SS-activated and non-activated blends separate OPC (tobermorite) and FAF (amorphous gel) hydrates with no mixed crystalline products formed. The compressive strength of all tested blends decreased by nearly 50% after 5 thermal-shock test cycles. These changes in the compressive strength were accompanied by a marked decrease in the intensities of XRD patterns of the crystalline hydrates after the thermalshock. As a result, there was no significant difference in the performance of the blends with different activators

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI ID:: 1232687

Report Number(s):: BNL--108355-2015-JA

Journal Information:: Advances in Cement Research, Journal Name: Advances in Cement Research Journal Issue: 12 Vol. 22; ISSN 0951-7197

Publisher:: ICE PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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