压力处理技术对钢渣孔隙填充效果的影响

成娜¹，赵之仲^1*，王龙飞²，程道华¹

1.山东交通学院交通土建工程学院，山东 济南  250357；2.北京建筑大学土木与交通工程学院，北京  102616

摘要：为解决钢渣孔隙率高、资源化利用效率较低等问题，提出一种微孔填充技术，基于气压驱动原理，优化钢渣孔隙内的气液置换过程，将水泥浆体高效稳定地注入钢渣微孔，在不同施压方式、施压时间、水灰比、试验温度和钢渣粒径下，测试钢渣填充后的质量增量，研究微孔填充技术对钢渣孔隙的影响规律。结果表明：随施压时间的增加，钢渣质量增量总体上增大，负压填充兼具安全与高效优势，在施压4 min时，负压填充的钢渣质量增量比正压增大20%，两种施压方式的最终填充质量趋于相同，约为0.45 g；水泥净浆的高黏度与较差的流动性使钢渣质量增量随水灰比的增大先减小后略增，水灰比为0.8时的钢渣质量增量为水灰比为2.0时的4.5倍；试验温度由25 ℃增至50 ℃会加速水泥水化团聚，钢渣质量增量减小37.5%，填充效率显著下降；钢渣粒径为>5~10 mm时填充效果最明显，质量增量为0.16 g。通过水泥产物填充钢渣孔隙，实现界面均质化，能显著降低孔隙率并提高气液置换效率。

关键词：微孔填充；正负压填充；孔隙率；质量增量

The influence of pressure treatment technology on the pore filling effect of steel slag

CHENG Na¹, ZHAO Zhizhong^1*, WANG Longfei², CHENG Daohua¹

1.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China；

2.School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China

Abstract: To address the issues of high porosity and low resource utilization efficiency of steel slag, a micropore filling technology is proposed. Based on the principle of pneumatic driving, the gas-liquid replacement process within the pores of steel slag is optimized, allowing the cement slurry to be efficiently and stably injected into the micropores of the steel slag. The quality increment of the steel slag before and after filling is tested under different pressure application methods, pressure application times, water-cement ratios, experimental temperatures, and steel slag particle sizes, studying the impact of micropore filling technology on the porosity of steel slag. The results indicate that with an increase in pressure application time, the overall mass increment of the steel slag increases. Negative pressure filling offers both safety and efficiency advantages; at 4 minutes of pressure application, the mass increment of steel slag filled under negative pressure is 20% greater than that of positive pressure. The final filling quality of the two pressure application methods tends to be the same, approximately 0.45 g. The high viscosity and poor fluidity of the cement slurry cause the mass increment of the steel slag to initially decrease and then slightly increase as the water-cement ratio increases. When the water-cement ratio is 0.8, the mass increment of the steel slag is 4.5 times than that at a water-cement ratio of 2.0. Increasing the experimental temperature from 25 °C to 50 °C accelerates the hydration agglomeration of the cement, resulting in a 37.5% decrease in the mass increment of the steel slag and a significant reduction in filling efficiency. The filling effect is most pronounced when the steel slag particle size is >5-10 mm, with a mass increment of 0.16 g. By filling the pores of the steel slag with cement products, interfacial homogenization can be achieved, significantly reducing porosity and improving gas-liquid replacement efficiency.

Keywords: micro-pore filling; positive and negative pressure filling; porosity; mass increment