| 摘要: |
| 对掺塑钢纤维的轻骨料混凝土(LWAC)试件进行快速冻融循环试验和抗压强度试验，得到冻融循环后该轻骨料混凝土的相对动弹性模量、质量损失率和抗压强度的变化规律.分别以相对动弹性模量和抗压强度为损伤变量建立了含塑钢纤维掺量参数的轻骨料混凝土冻融损伤模型.结果表明：塑钢纤维可有效地抑制轻骨料混凝土的冻融损伤；当塑钢纤维掺量为6kg/m3时，轻骨料混凝土的抗冻性能最好，服役寿命最长，抗压强度最高；塑钢纤维轻骨料混凝土抗压强度冻融损伤模型宜用指数函数型模型，该冻融损伤模型和相对动弹性模量冻融损伤模型的拟合精度较高，均能够较好地反映塑钢纤维轻骨料混凝土的冻融损伤变化规律. |
| 关键词: 塑钢纤维 轻骨料混凝土 冻融损伤模型 动弹性模量 抗压强度 |
| DOI：103969/j.issn.1007 9629201802010 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51368042） |
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| Freeze Thaw Damage Model of Plastic Steel Fiber ReinforcedLightweight Aggregate Concrete |
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NIU Jiangang1, ZUO Fuliang1, WANG Jialei2, XIE Chengbin1
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1.College of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;2.College of Civil Engineering, Central South University, Changsha 410083, China
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| Abstract: |
| The rapid freeze thaw tests and the compression tests were carried out to lightweight aggregate concrete(LWAC) mixed with plastic steel fiber．The variation rule of relative dynamic modulus, mass loss rate and cube compressive strength were analyzed after various cycles of freeze thaw．The relative dynamic elastic modulus and compressive strength of the LWAC were selected as the damage variable， and freeze thaw damage constitutive model was established containing a parameter of plastic steel fiber mass fraction．The results show that plastic steel fiber can restrain freeze thaw damage of the LWAC effectively. The LWAC mixed with plastic steel fiber of 6kg/m3 has the best frost resistance, the longest life and the highest compressive strength. The compressive strength damage model of the LWAC should adopt exponential function model, all of them have higher fitting precision for the freeze thaw damage model of relative dynamic elastic modulus and exponential function model, they all can reflect the change rules of freeze thaw damage of LWAC mixed with plastic steel fiber． |
| Key words: plastic steel fiber lightweight aggregate concrete(LWAC) freeze thaw damage model dynamic elastic modulus compressive strength |
