The effects of adding ground limestone to high alumina cement mortar were studied. The hydration was c~ed out at 60°0 to form the cubic hydrate C AM directly, hence avoiding the conversion of CAM to o I O3AM6, an~ a~ 20 C, Other experiments involved subsequent carbonation with CO 2 an~ thermal ~reat
The carbonation of high alumina cement, Part II
✍ Scribed by R.D. Blenkinsop; B.R. Currell; H.G. Midgley; J.R. Parsonage
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 282 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
This paper describes the results of an investigation into the carbonation of high alumina cement set pastes both by means of carbon dioxide in water and also by means of alkali carbonate solutions. The rates of penetration of carbonation into cylinders is greatest for the strongest (O.1M) solution of sodium carbonate but porosity and not carbonate concentration appears to be the controlling factor. Thus penetration rate increases with water/cement ratio; also cylinders cured at 40 °C showed a higher rate of penetration than those cured at 20 °C.
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The use of temperatures higher than 30°0 during the hydration of 1:3 high alumina cement mortar leads to the formation of the cubic hydra te C3AH~, hence avoiding the conversion of CAHIo to C3AH 6. The subsequent-carbonation of 03AH 6 with 002 and therm~l treatm@nt leads to the formation of stable c
The study about the hydraulic behaviour of the CA25 and the mechanochemical activated CA25 cements started in Part 1 is completed. The hydration anomalies are studied through the analysis of the AI +3 and Ca +2 ions in solution at the end of the solubilization period. With this purpose a non-convent
The compressive strength of concretes made from mixtures of 'Ciment Fondu' high-alumina cement and granulated blastfurnace slag has shown an increasing trend up to 5 years when kept under water at 20 ° and 38°C. Concretes made from neat HAC have shown much reduced strength at 38°C after only one wee