【作者】 毛高峰；

【导师】 李秋义；

【作者基本信息】 青岛理工大学 ， 结构工程， 2008， 硕士

【摘要】 随着城市化和小城镇建设进程的加快、工业和民用建筑的更新和市政动迁规模不断加大,一方面因建筑物解体而产生的废弃混凝土量急剧增加,如不能妥善处置,不仅会侵占大量耕地还会会污染环境;另一方面,混凝土的用量急剧增加,对天然骨料的需求加大,而天然骨料资源十分有限。利用废旧混凝土制备出高品质的再生骨料混凝土,不仅可以节省天然骨料资源,而且还可以减少废旧混凝土对环境的污染,符合可持续发展的国策。本文是在承接国家“十五”科技攻关课题(2004BA809B0305)的研究成果的基础上,在国家“十一五”科技支撑计划重点课题(2006BAJ02B0504)的资助下完成的。本文利用颗粒整形强化技术,对简单破碎再生粗骨料进行强化处理,对比研究了颗粒整形前后再生粗骨料性能的变化。本文重点分析了再生粗骨料种类(简单破碎再生粗骨料和颗粒整形再生粗骨料)、再生粗骨料取代率(0、40%、70%和100%)、粉煤灰掺量(0和30%)及胶凝材料用量(300kg/m~3、400 kg/m~3和500 kg/m~3)四种因素对再生混凝土工作性能、力学性能、收缩性能和耐久性能的影响。研究结果表明:颗粒整形可显著改善再生粗骨料的性能。颗粒整形再生粗骨料混凝土用水量比简单破碎混凝土有较大程度的降低,工作性良好。抗压强度与天然骨料的相当,高于简单破碎粗再生混凝土。收缩值小于简单破碎再生粗骨料混凝土,抗碳化性能、抗冻性能与抗氯离子渗透性能均优于简单破碎再生粗骨料混凝土。经过颗粒整形以后再生混凝土的强度已经接近天然碎石混凝土,部分强度甚至已经超过天然碎石近17%左右,40%颗粒整形再生粗骨料取代的强度平均约高20%,完全取代时的强度接近甚至部分高于天然碎石混凝土。颗粒整形再生粗骨料混凝土的收缩比简单破碎再生粗骨料混凝土有较大改善,当再生粗骨料取代率为40%、70%和100%时,颗粒整形再生粗骨料混凝土收缩平均值分别比简单破碎再生粗骨料混凝土小13%、9%和17%。粉煤灰掺量在30%时,粉煤灰掺量对再生骨料混凝土抗碳化能力略有下降,但是抗氯离子渗透性能上升。更多还原

【Abstract】 At present, as urbanization and the construction of small towns acceleration of the process of industrial and civil construction updates and increasing the scale of the relocation of municipal, on the one hand because of the disintegration of buildings and the drastic increase in volume of waste concrete, if not disposed of properly, it will not only occupation will be a large number of cultivated land will pollute the environment; On the other hand, the rapid increase in the amount of concrete, the natural increase aggregate demand, aggregate and natural resources is very limited. Waste concrete prepared using high-quality recycled aggregate concrete, aggregate not only save natural resources, but also can reduce waste concrete for the environment, consistent with sustainable development a national strategy. This is the accepting countries "15" scientific and technological subjects (2004 BA809B0305) on the basis of the results of research in the country, "11th Five-Year" plan focused on scientific and technological support issues (2006 BAJ02B0504) funding for completion.In this paper, plastic particles strengthen technology, a simple broken recycled coarse aggregate intensify with the Comparative Study of particles before and after plastic recycled coarse aggregate performance changes. This paper focus on the regeneration of coarse aggregate type (simple recycled coarse aggregate and broken plastic recycled coarse aggregate particles), the replacement of recycled coarse aggregate (0, 40%, 70% and 100%), fly-ash content ( 0 and 30%) and cementitious material consumption (300kg/m~3, 400kg/m~3 and 500kg/m3) four factors recycled concrete work on the properties, mechanical properties, shrinkage performance and durability of the impact.The results show that: Plastic particles can significantly improve the performance of recycled coarse aggregate. Plastic recycled coarse particles aggregate concrete water than a simple broken concrete a higher degree of reduced working good. And the compressive strength of a natural aggregate, higher than the simple broken recycled concrete. Shrink value is less than simple broken renewable coarse aggregate concrete, anti-carbonation performance, antifreeze properties and resistance to chloride ion permeability properties are better than simple broken renewable coarse aggregate concrete. After the plastic particles of recycled concrete has been close to the intensity of natural gravel concrete, some intensity even more than natural debris has been nearly 17%, 40% plastic recycled coarse aggregate particles replaced by high-intensity average of about 20%, completely replaced by the intensity close to or even higher than that of natural gravel concrete.Plastic recycled coarse aggregate particles contraction than the simple concrete recycled coarse aggregate concrete broken a big improvement when substitute renewable coarse aggregate rate of 40%, 70% and 100%, the coarse aggregate particles renewable plastic shrinkage of concrete average respectively, over the simple broken concrete small renewable coarse aggregate 13%, 9% and 17% respectively.Fly ash content of 30%, the fly ash content of recycled aggregate concrete anti-carbonation capacity declined slightly, but resistance to chloride ion permeability increase.更多还原