Full
GONG Yifan (1997-), male, Master candidate. E-mail: 1023720644@qq.com
Outline
Application of recycled aggregate becomes popular due to the shortage of natural sand and gravel. To improve the technical defects of recycled aggregate mortar, waste rubber particles were used to partially substitute for recycled brick-concrete fine aggregate. The influence of waste rubber particles content on the engineering properties of recycled aggregate mortar at different water-cement ratios was investigated. The consistency, water retentivity and apparent density of the mortar mixture were examined, and the mechanical properties, shrinkage, permeability and frost resistance of the mortar specimens were tested. The results show that the fluidity of the recycled aggregate mortar mixture increases, and the water retentivity decreases as the content of waste rubber particles increases. When the content of waste rubber particles is less than 10%, little decrease in water retentivity appears, while the improvement in fluidity is obvious. The rubber particles with contents of 3%-7% are able to improve the skeleton effect of the aggregate, hence increasing both the flexural and compressive strengths for the mortar specimens. This could be attributed to the elastic deformation of the rubber particles that reduces the stress concentration. When the contents of rubber particles are 3%-7%, the shrinkage resistance, anti-seepage property and frost resistance of the mortar specimens enhance, and these properties increase with increasing the content of waste rubber particles. The amendment of wastes rubber particles has a positive effect on the engineering properties of recycled aggregate mortar.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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