Stuay of Mineral Admixtures as Fine Aggregate on Hydration Products and Spectral Performance of Mortar
WU Fu-fei1, 2, DONG Shuang-kuai1*, ZHAO Zhen-hua1, GONG Jing-wei2, SHI Ke-bin2
1. School of Materials and Architectural Engineering Guizhou Normal University, Guiyang 550025，China
2. College of Civil and Hydraulic Engineering，Xinjiang Agricultural University，Urumqi 830052，China
Abstract：Fly ash, lithium slag and steel slag as industrial waste, replace quality cement to prepare cement mortar and concrete, but its utilization is often low, so using these industrial waste in large quantities by using X-ray diffraction (XRD), thermal analyzer, Fourier infrared spectrometer and scanning electron microscope analysis method, we studied the hydration products, spectral performance and microstructure of mortar after mineral admixtures as fine aggregate, and the change laws of mortar strength with the replacement rate (0%, 30%, 50%, 70% and 100%) were analyzed. Test results showed that the hydration products were CSH gel, Ca(OH)2, a small amount of AFt and Four kinds of slurry hydration products mainly for CSH gel, Ca(OH)2, a small amount of AFt and unhydrated particles (Al2O3 and SiO2) for cement paste, cement-lithium slag paste, cement-fly ash paste, cement-steel slag paste, which contain a certain Li2O·Al2O3·SiO2, Ca1.56SiO3.5·xH2O, and RO phase, respectively. Characteristic peak was 3 467, 3 438, 2 923, 2 348, 1 638, 1 429, 1 111, 1 000, 768, 696 and 462 cm-1 for four paste, but its strong peak was different and activity was also different, which was involved in the level of secondary hydration reaction is also different, so the content of Ca(OH)2 in cement-steel slag paste was significantly higher than cement-lithium slag paste and cement-fly ash paste. It played volcanic activity and filling effect when mineral admixtures replaced cement or fine aggregate. The flexural strength and compressive strength of mortar with 100% mineral admixture (lithium slag, fly ash and steel slag) were higher than pure cement mortar, it was about 37.77%/51.88%, 14.71%/11.70%, 14.71%/34.88%, respectively, But the flexural strength and compressive strength reached the maximum when the dosage of mineral admixtures was different. Therefore, mineral admixtures as fine aggregate of mortar were feasible, which can greatly improve the use of industrial waste in the concrete industry, and can achieve the result of energy conservation and emissions reduction.
Key words：Mineral admixtures; Fine aggregate；X-ray diffraction (XRD); Scanning electron microscopy (SEM); Thermal analyzer; spectral characteristics
吴福飞，董双快，赵振华，宫经伟，侍克斌. 矿物掺合料作为砂浆细集料的水化产物与光谱性能研究[J]. 光谱学与光谱分析, 2018, 38(09): 2853-2859.
WU Fu-fei, DONG Shuang-kuai, ZHAO Zhen-hua, GONG Jing-wei, SHI Ke-bin. Stuay of Mineral Admixtures as Fine Aggregate on Hydration Products and Spectral Performance of Mortar. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(09): 2853-2859.
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