| 封培然,竺斌,宋利丽.机制砂及其砂浆最小空隙率的试验研究[J].水泥工程,2015,28(2):1-6 |
| 机制砂及其砂浆最小空隙率的试验研究 |
| Experimental study on minimum void ratio of machine-made sand and mortar |
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| DOI：10.13697/j.cnki.32-1449/tu.2015.02.001 |
| 中文关键词: 机制砂 孔隙率 砂浆 形貌 Ⅱ区中砂 |
| 英文关键词: mechanism sand Porosity Mortar Morphology Ⅱ area medium sand |
| 基金项目: |
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| 摘要点击次数: 1892 |
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| 中文摘要: |
| 通过对外购机制砂、自制机制砂以及预拌砂浆三种体系孔隙率的研究，发现细骨料级配符合fuller曲线比符合国标Ⅱ区中砂更能获得较低的孔隙率；在机制砂外观形貌不同时，相同的颗粒分布测得的填充率不同，表面粗糙的机制砂可以获得较高的填充率；在使用粗砂的砂浆混凝土中，粗颗粒的存在可以提高填充率，过多的细颗粒则会降低填充率，在不使用粗砂时，也有相似的结论；预拌砂浆中的细物料会改变体系的填充率，整体上讲，砂浆的孔隙率比机制砂的孔隙率高约3%，而干混砂浆的物料级配符合fuller曲线更具有优势。 |
| 英文摘要: |
| By researching on porosity of three systems of foreign purchase mechanism sand, self-control mechanism sand and ready-mixed mortar, it is found that fine aggregate gradation in fuller curve than that conforms to the national standard Ⅱ area of medium sand can get lower porosity; and with difference mechanism sand morphology appearance, the filling rate of same partical size distribution is different, and the machine-made sand with coarse surface can obtain a higher filling rate; In the concrete mortar used coarse sand, the existence of coarse grain can increase the filling rate, and overdose of fine grain has counter-effect, and it has similar conclusion when not use coarse sand. The fine material in ready-mixed mortar system can change the filling rate, and overall, the void ratio of mortar is 3% higher than that of mechanism sand porosity, and the material grading that in line with fuller curve has more advantage. |
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