Effect of alkali-activated metakaolin cement on compressive strength of mortars
| Autor: | Kornnika Wianglor, Arnon Chaipanich, Manow Piyaworapaiboon, Sakprayut Sinthupinyo |
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| Rok vydání: | 2017 |
| Předmět: |
Cement
Materials science 0211 other engineering and technologies Mineralogy 020101 civil engineering Geology Sodium silicate 02 engineering and technology 0201 civil engineering law.invention chemistry.chemical_compound Portland cement Compressive strength chemistry Geochemistry and Petrology Sodium hydroxide law 021105 building & construction Calcium silicate hydrate Curing (chemistry) Metakaolin Nuclear chemistry |
| Zdroj: | Applied Clay Science. 141:272-279 |
| ISSN: | 0169-1317 |
| Popis: | This paper reports the compressive strength and microstructure characteristic of alkali-activated metakaolin (MK) cement under two curing methods. MK was used to replace part of Portland cement (PC) at 70, 80, 85, 90, 95 and 100% by mass of binder. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) were used as activating agents (Na2SiO3 to NaOH ratio of 0.67). NaOH with 10 molar concentrations, liquid alkali/binder ratio of 0.8 and water base was used. Mortar and paste specimens were cured at 23 ± 2°C (55% RH) and 60°C (95% RH). The results indicated that calcium silicate hydrate (C–S–H) and calcium carbonate (CaCO3) phases were detected by thermogravimetry (TGA). Setting time and drying shrinkage decreased when metakaolin replacement level increased, the compressive strength of alkali-activated metakaolin cement increased with the increase of PC content and increased with temperature. The curing of specimens at 60°C (95% RH) enhanced the compressive strength, matrices appeared denser than when cured at 23 ± 2°C (55% RH) and phases of (C, N)-A-S-H gel and or C–S–H gel can be seen clearly. |
| Databáze: | OpenAIRE |
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