文章摘要
冷粘成球密实时间对碳酸化钢渣球型骨料性能的影响
Effect of compacting time on properties of carbonated spherical steel slag aggregates prepared by Cold Bonding Pelletization
投稿时间:2018-12-14  修订日期:2019-01-31
DOI:
中文关键词: 冷粘成球法,钢渣,碳酸化,人造集料,
英文关键词: cold bonding palletization, steel slag, carbonation, artificial aggregate
基金项目:基金项目:国家自然科学基金资助项目(51172096)
作者单位E-mail
常钧 大连理工大学 mlchang@dlut.edu.cn 
于春阳 大连理工大学  
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中文摘要:
      以冷粘成球法制备的碳酸化钢渣球形骨料为研究对象,分析了密实时间对钢渣球形骨料物理力学性能及碳酸化反应程度的影响。测试了不同密实时间下球型骨料碳酸化前后的表观密度、吸水率及开孔孔隙率的变化规律,通过TG-DTG、MIP等手段分析不同密实时间下球型骨料碳酸化程度、孔结构的变化,结果表明:采用冷粘成球工艺制备球型钢渣骨料时,密实时间对钢渣球型骨料的表观密度影响很小,但球型骨料的吸水率随密实时间的增加下降明显。当密实时间从5min增加到30min时,碳酸化前后球型骨料的吸水率分别下降了29.5%和26.0%。钢渣球型骨料的强度主要来源于碳酸化反应,且球型骨料的碳酸化反应程度和强度随密实时间的增加而下降。碳酸化前吸水率为14.86%的球型骨料碳酸化后强度最高,为6.1MPa,达到同等粒径天然碎石强度的41%。碳酸化的过程是由外向内进行的,球壳的碳酸反应化程度高于球心,且碳酸化前球壳越致密,球心的碳酸化反应程度越低。
英文摘要:
      Taking the spherical aggregate of carbonated steel slag prepared by cold bonding palletization as research object. Effect of compacting time on the properties and carbonation degree of spherical aggregates made by carbonated steel slag was investigated. Changes of apparent density, water absorption and porosity of spheres before and after carbonation in different compacting time were tested. Variation of carbonation degree and pore structure in different compacting time were respectively characterized by TG/DTG and MIP. Results show that the apparent density of spherical steel slag aggregates is rarely affected by the compacting time, but the water absorption of spherical steel slag aggregates decreases obviously with increasing of the compacting time. When the compacting time increased from 5 min to 30 min, the water absorption of spherical aggregate decreased by 29.5% and 26.0% before and after carbonation, respectively. Strength of steel slag spherical aggregate mainly comes from carbonation reaction, and the degree and strength of carbonation reaction of spherical aggregate decrease with compacting time increasing. The spherical aggregate with 14.86% water absorption before carbonation has the highest strength after carbonation, which is 6.1 MPa, reaching 41% of strength of natural gravel with the same particle size. Process of carbonation is carried out from outside to inside. Degree of carbonation reaction of spherical shell is higher than that of spherical center. Denser spherical shell before carbonation leads to a lower degree for carbonation reaction of spherical center.
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