摘要
研究了5种再生骨料级配对混凝土强度的影响,试验表明,较小的最大公称粒径对混凝土强度有利.提出了微粉体系级配范围和关键粒径的概念,研究了硅灰单掺、矿渣和硅灰复掺、粉煤灰和硅灰复掺以及这3种掺和料复掺时的优化级配.指出了硅灰对获得紧密堆积体系不可缺少,且掺和料复掺时比硅灰单掺更为有效,这为堆积密实度计算结果所证实.流变学参数测定结果也表明,双掺15%(质量分数,下同)硅灰和15%粉煤灰时,浆体屈服应力和塑性粘度最小,因而具有最优级配.
Influence of gradation of five types of recycled aggregate on strength of recycled aggregate concrete was investigated. The experimental result shows that smaller nominal maximum size of recycled aggregate contributes to strength development. Grading range and key grain size of micro-powder system are proposed. And optimized gradation is calculated in situation of adding silica fume alone, incorporation of another mineral powder, or combination of silica fume, fly ash and blast slag. Addition of silica fume is essential to intense packing whereas addition of several mineral blendings together is more effective due to its more intense packing effect, which is verified by calculated packing density. When double mineral admixtures were used, rehological parameters were measured and the relatively lower yielding stress and plastic viscosity prove that an optimum gradation is acquired in case of 15%（by mass） silica fume and 15%（by mass） fly ash is added.
出处
《建筑材料学报》
EI
CAS
CSCD
2008年第1期105-110,共6页
Journal of Building Materials
基金
湖南省教育厅资助科研项目(06C113)
关键词
再生骨料
矿物掺和料微粉
级配优化
再生混凝土
recycled aggregate
mineral micro-powder
grading optimization
recycled aggregate concrete
