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Pozzolanic reaction in fly ash. Project report; Flyveaskes pozzolane reaktion; Projektrapport

Technical Report:

Abstract

The aim was to describe the pozzolanic reaction (reaction with calcium hydroxide) of fly ash. The description is based on theoretical and hardening reactions in the cement/fly ash system. Tests were made on cement paste, v/c 0.45, cement/fly ash paste with same original porosity as for cement paste and 30% fly ash (FA/Ce-weight conditions 0.30) and calcium hydroxide/fly-ash paste with the same fluid properties as cement paste and CH/FA- weight proportion 1.2. The cements` reaction and the combination of these reactions were also studied. The pastes` heat generation during hydration at 40 deg. centigrade and reduction of volume (at 20, 30 and 40 deg. centigrade) resulting from the state of the water during hydration were determined. In the case of cement/fly ash and calcium hydroxide/fly ash pastes the weight proportions between the components varied with the determination of volume reduction at 40 deg. centigrade - FA/Ce = 0.30, 0.45 and 0.60 CH/FA = 1.2, 0.8 and 0.4. It was also aimed to determine the various hydrating properties of fly ash. It was found that the pozzolanic reaction of fly ash follows linear kinetics in relation to the description of the dispersion model and that the cement/fly ash reaction could be  More>>
Publication Date:
Dec 31, 1992
Product Type:
Technical Report
Report Number:
DTH-LBM-TR-92-266
Reference Number:
SCA: 200200; PA: DK-93:001960; EDB-94:017977; NTS-94:008573; ERA-19:006593; SN: 94001129692
Resource Relation:
Other Information: PBD: 1992
Subject:
20 FOSSIL-FUELED POWER PLANTS; CEMENTS; FLY ASH; WASTE PRODUCT UTILIZATION; HARDENING; CALCIUM HYDROXIDES; TEMPERATURE DEPENDENCE; HYDRATION; VOLUME; HEAT; HYDRATES; CHEMICAL REACTIONS; EXPERIMENTAL DATA; MIXTURES; 200200; WASTE MANAGEMENT
OSTI ID:
10116480
Research Organizations:
Danmarks Tekniske Hoejskole, Lyngby (Denmark). Lab. for Bygningsmaterialer
Country of Origin:
Denmark
Language:
Danish
Other Identifying Numbers:
Other: ON: DE94730340; TRN: DK9301960
Availability:
OSTI; NTIS
Submitting Site:
DK
Size:
122 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Brunnstroem Jensen, J. Pozzolanic reaction in fly ash. Project report; Flyveaskes pozzolane reaktion; Projektrapport. Denmark: N. p., 1992. Web.
Brunnstroem Jensen, J. Pozzolanic reaction in fly ash. Project report; Flyveaskes pozzolane reaktion; Projektrapport. Denmark.
Brunnstroem Jensen, J. 1992. "Pozzolanic reaction in fly ash. Project report; Flyveaskes pozzolane reaktion; Projektrapport." Denmark.
@misc{etde_10116480,
title = {Pozzolanic reaction in fly ash. Project report; Flyveaskes pozzolane reaktion; Projektrapport}
author = {Brunnstroem Jensen, J}
abstractNote = {The aim was to describe the pozzolanic reaction (reaction with calcium hydroxide) of fly ash. The description is based on theoretical and hardening reactions in the cement/fly ash system. Tests were made on cement paste, v/c 0.45, cement/fly ash paste with same original porosity as for cement paste and 30% fly ash (FA/Ce-weight conditions 0.30) and calcium hydroxide/fly-ash paste with the same fluid properties as cement paste and CH/FA- weight proportion 1.2. The cements` reaction and the combination of these reactions were also studied. The pastes` heat generation during hydration at 40 deg. centigrade and reduction of volume (at 20, 30 and 40 deg. centigrade) resulting from the state of the water during hydration were determined. In the case of cement/fly ash and calcium hydroxide/fly ash pastes the weight proportions between the components varied with the determination of volume reduction at 40 deg. centigrade - FA/Ce = 0.30, 0.45 and 0.60 CH/FA = 1.2, 0.8 and 0.4. It was also aimed to determine the various hydrating properties of fly ash. It was found that the pozzolanic reaction of fly ash follows linear kinetics in relation to the description of the dispersion model and that the cement/fly ash reaction could be understood as the sum of the time -staggered cement and fly ash reactions. The fly ash reaction is very slow and its activation energy is determined at 75 kJ/mol. Volume reduction was 10-19 ml/100g fly ash at 40 - 20 deg. centigrade, the maximum heat generation during the reaction was approximately 400 J/g fly ash. Results indicate that during the fly ash reaction, calcium silica hydrates and other hydrates are produced. (AB) (41 refs.)}
place = {Denmark}
year = {1992}
month = {Dec}
}