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| 摘要: |
| 研究了不同尺寸（微细、中等）钢纤维混杂增强水泥砂浆的力学性能．结果表明：在钢纤维体积分数一定的情况下，混杂钢纤维对水泥砂浆力学性能的改善作用可优于单一直径钢纤维；不同尺寸钢纤维的混杂对水泥砂桨抗折强度的提高具有明显的混杂效应；集胶比是影响混杂钢纤维水泥砂浆力学性能的重要因素，集胶比越大，最优钢纤维混杂所需中等直径钢纤维的体积分数也应越大；2种不同直径钢纤维的混杂对水泥砂浆断裂能及断裂韧性的提高有协同效应． |
| 关键词: 钢纤维尺寸 混杂效应 水泥砂浆 集胶比 力学性能 |
| DOI： |
| 分类号:TU528.572 |
| 基金项目:高等学校博士学科点专项科研基金资助项目(20020247028) |
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| Study of Mechanical Properties of Different Size Hybrid Steel Fiber Reinforced Cement Mortar |
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WU Ke-ru LI Shu-jin
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| Abstract: |
| Mechanical properties of micro-diameter and medium-diameter steel fiber reinforced cement mortar were investigated.At a constant steel fiber volume fraction,the increase of mechanical properties of cement mortar reinforced by hybrid steel fiber can be larger than that by mono-diameter steel fiber.Different size hybrid steel fiber shows distinct hybrid effect on flexural strength of cement mortar.The m_S/m_B is an important factor for mechanical properties of hybrid steel fiber reinforced cement mortar.With increase of m_S/m_B,it needs more medium-diameter steel fiber to substitute micro-diameter steel fiber in hybrid steel fiber system.The hybrid systems of two steel fibers with different diameter have synergetic effect on fracture energy and toughness of cement mortar. |
| Key words: steel fiber size,hybrid effect,cement mortar,m_S/m_B,mechanical property, |
