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| 基于粗骨料和钢纤维分布的超高性能混凝土力学性能研究及强度计算模型 |
| Study on the mechanical properties of ultra-high performance concrete based on the distribution of coarse aggregates and steel fibers, and strength calculation model |
| Received:July 28, 2023 Revised:September 04, 2023 |
| DOI：10.7520/1001-4888-23-152 |
| 中文关键词: 超高性能混凝土 粗骨料分布 钢纤维分布 力学性能 计算模型 |
| 英文关键词:ultra high performance concrete coarse aggregate distribution steel fiber distribution mechanical properties calculation model |
| 基金项目:国家自然科学基金项目(51878068)；湖南省自然科学基金项目(2022JJ30600, 2023JJ30020)；长沙市自然科学基金项目(kq2202208)；湖南省研究生科研创新资助项目(CX20220891)；长沙理工大学土木工程优势特色重点学科创新性基金项目(17ZDXK07) |
| Author Name | Affiliation | | L Yigang | School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China | | ZHANG Jinghang | School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China | | CHEN Huowen | Dahao Municipal Construction Co.,Ltd., Shantou 515041, Guangdong, China | | HAN Weiwei | School of Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China | | HE Xianliang | School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China | | HUANG Dunwen | School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China | | PENG Hui* | School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China |
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| 中文摘要: |
| 为探明粗骨料与钢纤维的相互作用对超高性能混凝土的综合影响，研究了粗骨料体积掺量和钢纤维体积掺量对超高性能混凝土力学性能的影响，并通过Image-Pro Plus软件对试件切面进行处理，计算粗骨料和钢纤维的均匀分布程度，从而获得粗骨料和钢纤维分布情况对含粗骨料超高性能混凝土性能的影响规律。研究结果表明：钢纤维掺量一定时，粗骨料体积掺量对含粗骨料超高性能混凝土的抗压强度具有增强效果，最高可提高15.55%，但会降低24.34%的抗折强度；粗骨料掺量一定时，在钢纤维与骨料的互锁作用下，通过发挥耦合增强作用，可以提高含粗骨料超高性能混凝土的抗压强度，但过量的钢纤维容易结团，会削弱钢纤维的桥接作用，使抗折强度先增加后下降；考虑粗骨料与钢纤维相互作用对力学性能影响的特点，建立了含粗骨料掺量和钢纤维掺量双变量因素下的抗压强度、抗折强度计算模型，计算模型准确度较好，对工程应用具有一定的参考价值。 |
| 英文摘要: |
| In order to investigate the comprehensive influence of the interaction between coarse aggregate and steel fiber on the properties of ultra-high performance concrete, the influence of the volume content of coarse aggregate and steel fiber on the mechanical properties of ultra-high performance concrete was studied. The section of the specimen was processed by Image-Pro Plus software to calculate the uniform distribution of coarse aggregate and steel fiber. The influence of coarse aggregate and steel fiber distribution on the performance of ultra-high performance concrete containing coarse aggregate is obtained. The results show that when steel fiber content is constant, coarse aggregate volume content can increase the compressive strength of ultra-high performance concrete containing coarse aggregate by up to 15.55%, but decrease the bending strength by 24.34%. When the content of coarse aggregate is constant, the compressive strength of ultra-high performance concrete containing coarse aggregate can be improved by coupling reinforcement under the interlocking effect of steel fiber and aggregate, but excessive steel fiber is easy to aggregate, which will weaken the bridging effect of steel fiber and make the bending strength increase first and then decrease. Based on the influence of the interaction between coarse aggregate and steel fiber on mechanical properties, the calculation model of compressive strength and flexural strength under the dual variables of coarse aggregate content and steel fiber content is established. The calculation model is accurate and has certain reference value for engineering application. |
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