煤气化粗渣-矿渣基地质聚合物的制备与性能

在煤气化粗渣基地质聚合物中复掺矿渣可改善其早期力学性能。本文以煤气化粗渣和矿渣为原料制备地质聚合物,系统研究了不同矿渣掺量对煤气化粗渣基地质聚合物早期力学性能及微观结构的影响。利用X射线衍射、压汞测试、扫描电镜、傅里叶红外光谱等方法对煤气化粗渣-矿渣基地质聚合物的微观结构进行分析表征。结果表明,当矿渣掺量增加时,地质聚合物抗压强度呈逐渐增大趋势。矿渣掺量为40%(质量分数)时,样品28 d抗压强度高达53.1 MPa。由微观分析可知,掺入矿渣后地质聚合物表面生成了大量水化硅铝酸钙/钠(C(N)-A-S-H)凝胶,使地质聚合物微观结构更为致密,力学性能得到改善。

Preparation and Properties of Coal Gasification Coarse Slag-Blast Furnace Slag Based Geopolymer

Mixing blast furnace slag (BFS) in coal gasification coarse slag (CGCS) based geopolymer improves its early mechanical properties. In this paper, CGCS and BFS were used as raw materials to prepare geopolymer, and the effect of different BFS content on the early mechanical properties and microstructure of geopolymer was studied. The microstructure of activated CGCS-BFS based geopolymer was characterized by X-ray diffraction, mercury intrusion porosimeter, scanning electron microscope and Fourier transformed infrared spectroscopy. The results show that the compressive strength of geopolymer increases gradually when the BFS content increases. When the BFS content reaches 40% (mass fraction), the 28 d compressive strength of sample is as high as 53.1 MPa. According to the microscopic analysis, a large amount of calcium/sodium silicate aluminate hydrate (C(N)-A-S-H) gel is formed on the surface of the geopolymer, which makes the microstructure of geopolymer more denser, and thus improves the mechanical properties of geopolymer.