为探讨脱碳气化渣用作水泥混凝土矿物掺合料的可行性，将脱碳气化渣粉、粉煤灰和钢渣粉3种灰渣粉分别取代水泥制备混凝土和胶砂试件，对其工作性能和力学性能进行研究，结合X射线荧光光谱仪、X射线衍射仪和扫描电镜分析了灰渣粉的化学组成、矿物组成和微观形貌。结果表明：粉煤灰和钢渣粉均含有球状玻璃体，有助于提高浆体流动性，脱碳气化渣粉颗粒则粗糙、多孔，需水量大，对混凝土的流动性略有降低，但混凝土拌合物坍落度210 mm、扩展度500 mm，仍满足工作性能要求；随龄期增加，掺不同灰渣粉混凝土的抗压强度呈增长趋势，3 d龄期时，各组强度均达到设计值的70%以上，其中，钢渣粉中的硅酸盐矿物早期水化，使混凝土强度增加明显，粉煤灰中含有一定量的石灰、石膏，有助于激发其中玻璃体的活性，特别是28 d龄期时，脱碳气化渣组强度超过设计值23%，其中的玻璃体水化反应迟缓，形成的产物对后期强度的提高贡献较大；灰渣粉的质量系数越高，其活性越高，胶砂试件的抗压强度相应较高，但灰渣粉的活性并非影响混凝土强度的唯一因素；脱碳气化渣粉表面棱角多，增强了渣粉颗粒与水泥浆体间的黏结力，其胶砂试件的折压比相对最高，7 d龄期时，折压比相对基准组提高了50%，28 d龄期时，同比基准组高出78%，脱碳气化渣粉有助于混凝土（砂浆）韧性的提高。

To explore the feasibility of using decarbonized coal gasification slag (DGSP) as supplementary material in concrete,the decarbonized coal gasification slag powder,fly ash (FA) and steel slag powder (SSP) were employed to replace cement to prepare the mortar and concrete samples. The workability and mechanical properties were studied. Meanwhile,the chemical composition,mineral composition and micro morphology of the powders were analyzed by using X-ray fluorescence (XRF) spectrometer,X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that,the existence of globular vitreous body in FA and SSP helps to improve the flowability of the mixture. The slump of the fresh concrete with DGSP slightly reduces to 210 mm with slump flow to 500 mm,due to the rough and porous surface of the particles,resulting in much more water demand,which still meet the working requirements. Moreover,the compressive strength of all the specimens increases with the curing age,in particular,each group reaches over 70% of the designed strength value at 3 d age. The strength of the specimens with SSP increases significantly due to the early hydration of silicate minerals in the powders,while fly ash contains a certain amount of lime and gypsum,which helps to stimulate the activity of glass,and activates the hydration of vitreous materials in FA. Especially,the strength of the specimens with DGSP at 28 d exceeds the designed value by 23%,due to the delayed vitreous hydration next to the hydration of cement,leading to the improvement of the later strength of the concrete. It is explicit that the higher the mass coefficient of the particles is,the higher the activity and compressive strength of the mortar is. However,the compressive strength of the concrete is not only influenced by the activity of the powders. The surface of decarburized gasification slag powder has many edges and corners,which enhances the adhesion between slag powder particles and cement paste,and the flexural pressure ratio of mortar specimen is relatively the highest,leading to the increase of the ratio of bending-compressive strength of the specimens with DGSP by 50% compared with the group of ordinary portland cement at 7 d,and 78% at 28 d. 

0 引言

1 试验

   1.1 原材料

   1.2 配合比

   1.3 试验内容

2 结果与讨论

   2.1 脱碳气化渣粉混凝土的性能

   2.2 掺脱碳气化渣的水泥胶砂性能

3 结论