试验调查了不同性质颗粒(粉煤灰、硅粉颗粒、橡胶颗粒、铁粉颗粒)对超高强水泥基材料的增强效应,结合微观结构分析探讨了相应的增强机理,提出了超高强水泥基颗粒增强材料微细观结构的物理模型.结果表明,不同性质的颗粒对水泥基材料的增强效应显著不同,采用活性矿物质颗粒和铁粉颗粒是提高超高强水泥基材料强度的有效途径,采用抗拉性能和变形性好的橡胶颗粒有利于提高超高强水泥基材料的韧性.
Experiments are carried out to investigate the mechanical properties of very high strength cementitious composites(VHSC) reinforced by various powders such as reactive or inert mineral particles,iron powders and rubber particles.And also its corresponding mechanism is analyzed by coupling with microstructure test.A physical model for VHSC is presented.Results indicate that the strengthening effects of different particles with various mechanical properties are obviously different from each other.It is very effective to improve strength of VHSC by combination of reactive ultra-fine mineral particles and iron powders.The toughness of VHSC can be enhanced by addition of rubber particles.
参考文献
| [1] | Roy D M .New strong cement materials:Chemically bonded ceramics[J].Science,1987,235(02):651. |
| [2] | Birchall D;Howard A J;Kendall K .Flexural strength and porosity of cements[J].Nature,1981,289(29):388. |
| [3] | Santos R S;Rodrigues F A;Segre N et al.MDF cements:Influence of polymer,cement type,and silica fume[J].Cement and Concrete Research,1999,29:747. |
| [4] | Richard P;Cheyrezy M .Composition of reactive powder concrete[J].Cement and Concrete Research,1995,25(07):1501. |
| [5] | Tasdemir M A;Tasdemir C et al.Evaluation of strains at peak stresses in concretes:A three phase composite model approach[J].Cement and Concrete Composites,1998,20:301. |
| [6] | 潘钢华.高强和超高强水泥基复合材料中微集料效应的实验研究[J].工业建筑,1997(12):33. |
| [7] | Yang C C;Huang R .A two-phase model for predicting the compressive strength of concrete[J].Cement and Concrete Research,1996,26(10):1567. |
| [8] | Mohamed A R;Hansen W .Micro-mechanical modeling of crack-aggregate interaction in concrete materials[J].Cement and Concrete Composites,1999,21:349. |
| [9] | Banu Z;Nagarai T S .Synergetic roles of concrete ingredients in strength development[J].Construction and Building Materials,1996,10(04):251. |
| [10] | 龙广成 .活性粉末水泥基材料的组成、结构与性能[D].上海:同济大学,2004. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%