Hydration Properties of Ground Granulated Blast-Furnace Slag (GGBS) Under Different Hydration Environments
| Autor: | Weiwei Han, Shuhua Liu, Qiaoling Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
lcsh:TN1-997
Ettringite Materials science alkali-activated slag cement 0211 other engineering and technologies Tobermorite GGBS 02 engineering and technology law.invention chemistry.chemical_compound law hydration properties General Materials Science Composite material lcsh:Mining engineering. Metallurgy Cement 021110 strategic defence & security studies GGBS slag Portland cement supersulfated cement alkali-activated slag cement hydration properties Slag 021001 nanoscience & nanotechnology Portland cement Compressive strength chemistry Chemical engineering supersulfated cement Ground granulated blast-furnace slag visual_art visual_art.visual_art_medium slag Portland cement Cementitious 0210 nano-technology |
| Zdroj: | Medžiagotyra, Vol 23, Iss 1, Pp 70-77 (2017) |
| ISSN: | 2029-7289 1392-1320 |
| Popis: | The hydration properties of various cementitious materials containing Ground Granulated Blast-furnace Slag (GGBS), two alkali-activated slag cements (AAS-1 and AAS-2) in which sodium silicate and sodium hydroxide act as alkaline activators respectively, supersulfated cement (SSC) and slag Portland cement(PSC), are compared with ordinary Portland cement (OPC) to investigate the effect of activating environment on the hydration properties in this study by determining the compressive strength of the pastes, the hydration heat of binders within 96 hours, and the hydration products at age of 28 days. The results show that C-S-H gels are the main hydrated products for all cementitious systems containing GGBS. Ca(OH)2 is the hydration products of OPC and PSC paste. However, ettringite and gypsum crystals instead of Ca(OH)2 are detected in SSC paste. Additionally, tobermorite, a crystalline C-S-H, and calcite are hydrated products in AAS-1. Tobermorite, cowlesite and calcite are hydrated products of AAS-2 as well. Based on strength results, AAS-1 paste exhibits the highest compressive strength followed by POC, PSC, SSC in order at all testing ages and AAS-2 give the lowest compressive strength except for the early age at 3 days, which is higher than SSC but still lower than PSC. From hydration heat analysis, alkalinity in the reaction solution is a vital factor influencing the initial hydration rate and the initial hydration rate from higher to lower is AAS-2, AAS-1, OPC, PSC and SSC. Although AAS possesses a faster reaction rate in the initial hours, cumulative hydration heat of AAS is comparably lower than that of OPC, but higher than those of PSC and SSC in turn, which indicates that the hydration heat of clinkers is much higher than that of slag.DOI: http://dx.doi.org/10.5755/j01.ms.23.1.14934 |
| Databáze: | OpenAIRE |
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