钢渣代砂环保型建筑砂浆性能的试验研究

发布时间：2018-04-27 18:57

本文选题：细骨料 + 钢渣砂浆　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：建筑砂浆是建筑工程中用量最大的、不可或缺的重要建筑材料之一，随着城市化进程的加快，大量开采天然砂配制建筑砂浆，不仅造成严重的环境问题，而且导致天然砂资源短缺。而另一方面，随着钢铁工业的发展，大量与天然砂颗粒类似的钢渣，却被当作废弃物大量堆积，不仅占用土地，而且污染环境。将钢渣进行粉磨作为掺合料，因其具有一定的水硬活性已用于制备胶凝材料，然而将其作为砂浆中细骨料的替代品对建筑砂浆性能影响如何，还有待进一步试验研究。本文以钢渣砂浆整体稳定性良好为前提，从不同堆放期的钢渣中获取钢渣细骨料试样，分别进行不同比例替代天然砂制备建筑砂浆的试验研究。同时，试验本着最大化利用钢渣和改善传统砂浆性能的原则，在钢渣作细骨料达到稳定性的基础上，掺入适量的钢渣粉和矿渣粉，研究建筑砂浆的物理力学性能及耐久性能；利用扫描电镜对骨料和水泥石界面的微观结构进行分析，并通过三甲基硅烷化技术，结合气相色谱分析方法，从[SiO_4]~(4-)单体的含量的角度分别分析水泥、钢渣、矿渣以及水泥-钢渣-矿渣胶凝体系的活性。试验结果表明：当钢渣细骨料稳定性不良时，，适当降低钢渣的最大粒径可以减少其对砂浆整体稳定性的影响。堆放期较短的钢渣在0.15-4.75mm以及0.15-1.18mm分别替代天然砂的10%和25%时，砂浆稳定性满足要求；并且在此钢渣细骨料替代量下，复掺20%钢渣粉和20%矿渣粉替代部分水泥制备砂浆，砂浆施工性能和抗收缩性能表现良好，但早期抗压强度和抗冻性能较差。堆放期较长的钢渣，当作为细骨料替代量达到50%时，砂浆的各项性能表现最好。试验微观分析表明，骨料界面的微观结构与砂浆的宏观行为相符，胶凝材料的活性与其水化前[SiO_4]~(4-)单体含量的多少呈线性关系，[SiO_4]~(4-)单体的含量越多，水化活性越大。
[Abstract]:Construction mortar is one of the most important and indispensable important building materials in construction engineering . With the acceleration of urbanization , large amount of natural sand is used to formulate building mortar , which not only causes serious environmental problems , but also leads to the shortage of natural sand resources .

On the premise of good overall stability of steel slag mortar , the steel slag fine aggregate samples were obtained from steel slag with different stacking periods . The experimental study on the preparation of mortar was carried out according to the principle of maximizing the utilization of steel slag and improving the performance of traditional mortar , and adding proper amount of steel slag powder and slag powder on the basis of maximizing the utilization of steel slag and improving the performance of traditional mortar , and studying the physical and mechanical properties and durability of the mortar .
The microstructure of aggregate and cement - stone interface was analyzed by SEM , and the activity of cement , steel slag , slag and cement - steel slag - slag cement system was analyzed by means of trimethylsilanization and gas chromatography .

The results show that when the stability of steel slag fine aggregate is bad , the influence of the maximum particle size of steel slag on the overall stability of mortar can be reduced , and the stability of mortar meets the requirement when the steel slag with shorter stacking period is between 0.15 - 4.75mm and 0.15 - 1.18 mm respectively .
The results show that the microstructure of aggregate interface is consistent with the macroscopic behavior of mortar , and the higher the content of SiO _ 4 ~ ( 4 - ) monomer , the more hydration activity is .

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU578.1

【参考文献】