Deterioration Characteristics of Cement-Limestone Powder Paste Under Compound Erosion Solution
<p>The deterioration characteristics of cement-limestone powder paste under compound erosion solution were studied in this paper by determining the compressive and flexural strength of pastes, the hydration products and SEM micrographs. The results indicate that H<sup>+</sup> and S...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Kaunas University of Technology
2018-05-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | http://matsc.ktu.lt/index.php/MatSc/article/view/17644 |
| Summary: | <p>The deterioration characteristics of cement-limestone powder paste under compound erosion solution were studied in this paper by determining the compressive and flexural strength of pastes, the hydration products and SEM micrographs. The results indicate that H<sup>+</sup> and SO<sub>4</sub><sup>2-</sup> ions play major roles in compound erosion solution. Besides the neutralization reaction between H<sup>+</sup> ions and Ca(OH)<sub>2</sub>, the reaction between Ca<sup>2+</sup> ions and SO<sub>4</sub><sup>2-</sup> ions generates CaSO<sub>4</sub>·2H<sub>2</sub>O and results in expansion. The crystal hydration products of all pastes before erosion are Ca(OH)<sub>2</sub> and some CaCO<sub>3</sub> from unhydrated limestone powder. While after erosion, the content of CaCO<sub>3</sub> and Ca(OH)<sub>2</sub> decreases rapidly and more gypsum forms. Limestone powder may improve the resistance to compound erosion sometimes. The resistance to compound erosion solution of compressive strength becomes weaker with the increase of the dosage of limestone powder (LP), while that of flexural strength becomes stronger. The compound erosion resistance is strong for the pastes with fly ash (FA) and LP, which can accelerate the compressive and flexural strength over curing age.</p> <p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.24.2.17644">http://dx.doi.org/10.5755/j01.ms.24.2.17644</a></p> |
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| ISSN: | 1392-1320 2029-7289 |