Compressive strength and hydration process of ground granulated blast furnace slag-waste gypsum system managed by wet grinding
Compressive strength and hydration process of ground granulated blast furnace slag-waste gypsum system managed by wet grinding
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湿磨管理的磨细粒化高炉矿渣-废石膏系统的抗压强度和水化过程
DOI：
10.1016/j.conbuildmat.2019.116777
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发表时间：
2019-12
影响因子：
7.4
通讯作者：
Yang Jin
中科院分区：
文献类型：
--
作者：
Zhang Junjie;Tan Hongbo;He Xingyang;Yang Wei;Deng Xiufeng;Su Ying;Yang Jin
用工业废料代替波特兰水泥已被接受为减少碳排放的潜在途径。以高炉矿渣、脱硫石膏和磷石膏为原料，研究了不同的工业废弃物对矿渣的处理效果。为开发新型低碳材料，设计了由矿渣和废石膏组成的胶结料;为了提高原料的反应活性，对原料进行了湿磨处理。通过XRD、TG、NMR、SEM、MIP等测试手段，研究了水泥的水化过程。结果表明，湿磨PG（WGPG）和湿磨DG（WGDG）能显著提高湿磨矿渣（WGS）体系的抗压强度。其原因是钙矾石的形成加快，孔隙率降低。一方面，钙矾石的存在可以构筑晶体骨架，加速体系的硬化;另一方面，不断产生的C-S-H凝胶使微观结构致密化，孔隙率显著降低。与WGDG-WGS体系相比，WGPG-WGS体系的早期强度较低，这是由于PG中磷的阻滞作用所致。
Replacement of Portland cement by industrial wastes has been accepted as a potential way to reduce carbon emissions. Ground granulated blast furnace slag (GGBS), desulphurization gypsum (DG), and phosphogypsum (PG), known as the common industrial wastes, were used in this study. Binders comprised of GGBS and waste gypsum were designed to develop a novel low carbon material; in order to promote the reactivity raw materials were processed by wet grinding. Compressive strength was examined and hydration process was researched by XRD, TG, NMR, SEM, and MIP. Results showed that wet grinded PG (WGPG) and wet grinded DG (WGDG) were able to greatly augment compressive strength of wet grinded GGBS (WGS) system. The reasons were attributed to the accelerated formation of ettringite and the reduced porosity. On the one hand, the presence of ettringite could construct the crystal skeleton resulted in the hardening of system accelerated. On the other hand, the constantly produced C-S-H gel densified the microstructure and decreased the porosity significantly. Moreover, in comparison with WGDG-WGS system, the early strength of WGPG-WGS system was lower caused by the retardation effect of phosphorus in PG. Results was expected to be used for the design of low carbon materials.
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11.1
作者：
S. P. Holt;N. Berge
通讯作者：
S. P. Holt;N. Berge
影响因子：
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影响因子：
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作者：
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作者：
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影响因子：
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作者：
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通讯作者：
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