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本文主要研究硅粉对水泥浆和混凝土改性的作用。研究表明:硅粉可作为活性的超细均匀粒子掺入水泥浆中,并在水泥水化初期即与氢氧化钙反应生成C-S-H凝胶,使氢氧钙石数量减少、最可几孔径减小,从而使浆体密实性增加,强度提高。硅粉的最大掺量以5%为宜。如欲增大掺量宜与减水剂和磨细生石灰共用,这样,可进一步提高强度,并可免除因碱度降低而引起的不利影响。掺入硅粉可使混凝土申水泥浆-集料界面氢氧化钙的取向度降低、数量减少、晶粒变细,并增加C-S-H凝胶的数量和聚合度,提高水泥浆～集料界面粘结强度,从而改善混凝土的力学性能。
This article mainly studies the effect of silica fume on the modification of cement slurry and concrete. Studies have shown that: silica fume can be used as an active ultra-fine uniform particles incorporated into the cement slurry, and in the early stage of cement hydration and react with calcium hydroxide to generate CSH gel, so that the amount of dicalite decreases, the most probable pore size decreases , In order to increase the density of the slurry and increase the strength. The maximum amount of silicon powder is 5%. To increase the dosage should be shared with the water-reducing agent and milled quicklime. In this way, the strength can be further increased and the adverse effects caused by the decrease in alkalinity can be eliminated. The incorporation of silica fume can reduce the degree of orientation, the amount, and the grain size of Ca(OH)2 in the concrete slurry-aggregate interface, and increase the number and degree of polymerization of CSH gel, and improve the interface between cement slurry and aggregate. Strength, thereby improving the mechanical properties of concrete.