| 引用本文: | 常世举,陈小攀,贾朋,等.纤维素纤维增强面板混凝土制备与机理研究[J].灌溉排水学报,0,():-. |
| CHANG Shi-ju,CHEN Xiao-pan,JIA Peng,et al.纤维素纤维增强面板混凝土制备与机理研究[J].灌溉排水学报,0,():-. |
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| 纤维素纤维增强面板混凝土制备与机理研究 |
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常世举, 陈小攀, 贾朋, 余传永, 王立奎, 赵杰
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河南天池抽水蓄能有限公司
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| 摘要: |
| 为了提高面板混凝土的抗裂性能,进行了多个不同配合比组合的面板混凝土试验研究,对比研究了单掺粉煤灰、粉煤灰+MgO混掺、粉煤灰+纤维素纤维混掺的三种不同组合的面板混凝土,对混凝土的力学性能、变形性能、圆环法及大板抗裂性能、微观早期抗裂性能等进行了研究,并分析了其抗裂机理,结果表明：纤维素纤维增强面板混凝土的劈拉强度和极限拉伸值最高,初裂起始时间最晚,单位面积裂缝数目最少,说明掺纤维的效果最好,抑制了水泥浆体早期裂缝的发展,其抗裂性能最优。另外微观扫描电镜分析表明,掺粉煤灰和纤维后面板混凝土的90d龄期的试样中结构较为致密,后期形成大量的团簇状短棒产物,能谱分析显示产物中钙的比例下降,硅铝比例提高,后期的粉煤灰水化消耗了一定的钙,降低了产物的钙硅比,形成的产物进一步填充密实,强度得到大幅的提高。 |
| 关键词: 纤维素纤维混凝土;面板混凝土;抗裂性能 |
| DOI： |
| 分类号:TV431 |
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| Preparation of Reinforced Cellulose Fiber Panel Concrete and its Strengthening?Mechanism |
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CHANG Shi-ju, CHEN Xiao-pan, JIA Peng, YU Chuan-yong, WANG Li-kui, ZHAO Jie
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Henan Tianchi Pumped Storage Company Ltd,Nanyang
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| Abstract: |
| In order to improve the crack resistance of the face slab concrete, a number of experimental studies on concrete slabs with different mix proportions were carried out. Three different combinations of the face slab concrete are tested respectively, which are single mixed with fly ash, mixed with fly ash and MgO, mixed with fly ash and cellulose fiber. The mechanical properties, deformation properties, crack resistance of the large slab by ring method and micro early crack resistance of the concrete are studied,and the anti-cracking mechanism is analyzed. The results show that the effect of concrete mixed with fly ash and fiber is the best, the splitting tensile strength and ultimate tensile value are the highest, the initial crack starts at the latest, and the number of cracks per unit area is the least, the development of early cracks in cement paste is restrained, and the crack resistance is the best. In addition, the SEM analysis shows that the structure of the 90 days old concrete samples mixed with fly ash and fiber is relatively compact, and a large number of cluster like short rod products are formed in the later stage. The energy spectrum analysis shows that the proportion of calcium in the products decreases, the proportion of silicon and aluminum increases, the hydration of fly ash consumes a certain amount of calcium in the later stage, reduces the calcium silicon ratio of the products, and the products formed are further filled tightly. In fact, the strength has been greatly improved. |
| Key words: cellulosic fiber concrete; face slab concrete; crack resistance |
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