| 摘要: |
| 通过对再生粗骨料混凝土不同龄期的抗压试验，研究了其抗压强度龄期发展机理；综合最终抗压强度和初始强度发展速率，采用半值强度指数建立了再生粗骨料混凝土抗压强度龄期模型的特征方程，揭示了传统双曲线模型的缺陷，指出了理想的抗压强度龄期模型应具备的数学性质.最后建立了新的抗压强度龄期模型，通过试验数据拟合证明了该模型的正确性. |
| 关键词: 再生粗骨料混凝土(RCAC) 龄期 抗压强度 数学模型 |
| DOI：10.3969/j.issn.1007 9629.2012.05.010 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50639050)；江苏教育厅自然科学基金资助项目(08KJB130001)；江苏省国土资源厅自然科学基金资助项目(2009D15)；教育部科学技术研究重点项目(211068)；住房与城乡建设部研究开发项目(2012 k3 4) |
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| Mathematical Model for Age Dependent Compressive Strength of Recycled Coarse Aggregate Concrete |
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WANG Wei1, ZHOU Ai zhao2, FENG Li1, PAN Gao jie1, LI Juan1
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1.Department of Civil Engineering, Shaoxing University, Shaoxing 312000, China;2.School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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| Abstract: |
| Mechanism for compressive strength increase of recycled coarse aggregate concrete(RCAC) was analyzed, and compressive strength tests of RCAC were conducted at 1, 2, 3, 5, 7, 14 and 28d ages. A concept, named half value strength index, for age strength model of RCAC was proposed and employed. Combined with initial hardening rate and final strength, mathematical age strength model is established in order to reveal deficiency of conventional hyperbolic age strength model. Mathematical characteristic that ideal age strength model should have is pointed out. A new age strength model of RCAC is presented which can overcome the deficiency of conventional age strength model. Finally, good agreements have been found between tested data and new model simulations. |
| Key words: recycled coarse aggregate concrete(RCAC) age compressive strength mathematical model |
