Effect of Cement Types and Superabsorbent Polymers on the Properties of Sustainable Ultra-High-Performance Paste
| Autor: | Yi-Sheng Wang, Mei-Yu Xuan, Xiao-Yong Wang, Seung-Jun Kwon, Han-Seung Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
Materials science 0211 other engineering and technologies 02 engineering and technology lcsh:Technology Article law.invention chemistry.chemical_compound law 021105 building & construction General Materials Science Relative humidity autogenous shrinkage Composite material lcsh:Microscopy belite-rich Portland cement internal curing Shrinkage lcsh:QC120-168.85 Cement Calcium hydroxide lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology superabsorbent polymer Portland cement Compressive strength Superabsorbent polymer chemistry sustainable ultra-high-performance paste lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Volume 14 Issue 6 Materials, Vol 14, Iss 1497, p 1497 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14061497 |
| Popis: | This study focuses on the effects of superabsorbent polymers (SAP) and belite-rich Portland cement (BPC) on the compressive strength, autogenous shrinkage (AS), and micro- and macroscopic performance of sustainable, ultra-high-performance paste (SUHPP). Several experimental studies were conducted, including compressive strength, AS, isothermal calorimetry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance (ATR)–Fourier-transform infrared spectroscopy (FTIR), ultra-sonic pulse velocity (UPV), and electrical resistivity. The following conclusions can be made based on the experimental results: (1) a small amount of SAP has a strength promotion effect during the first 3 days, while BPC can significantly improve the strength over the following 28 days. (2) SAP slows down the internal relative humidity reduction and effectively reduces the development of AS. BPC specimens show a lower AS than other specimens. The AS shows a linear relationship with the internal relative humidity. (3) Specimens with SAP possess higher cumulative hydration heat than control specimens. The slow hydration rate in the BPC effectively reduces the exothermic heat. (4) With the increase in SAP, the calcium hydroxide (CH) and combined water content increases, and SAP thus improves the effect on cement hydration. The contents of CH and combined water in BPC specimens are lower than those in the ordinary Portland cement (OPC) specimen. (5) All samples display rapid hydration of the cement in the first 3 days, with a high rate of UPV development. Strength is an exponential function of UPVs. (6) The electrical resistivity is reduced due to the increase in porosity caused by the release of water from SAP. From 3 to 28 days, BPC specimens show a greater increment in electrical resistivity than other specimens. |
| Databáze: | OpenAIRE |
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