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（鄭州大學(xué)土木工程學(xué)院， 鄭州 450001）

［摘要］采用磷酸鎂水泥、普通硅酸鹽水泥、快硬硫鋁酸鹽水泥和微細(xì)鋼纖維制備疊層修復(fù)材料，通過(guò)疊層修復(fù)板的受彎試驗(yàn)，探索了疊層厚度、微細(xì)鋼纖維體積摻量和水泥類(lèi)型等對(duì)疊層修復(fù)板受彎性能的影響。結(jié)果表明：彎曲荷載作用下，普通混凝土疊層修復(fù)板的破壞形式為跨中折斷的脆性破壞，微細(xì)鋼纖維傳統(tǒng)水泥（普通硅酸鹽和快硬硫鋁酸鹽水泥）砂漿疊層修復(fù)板的破壞形式為跨中多裂縫的韌性破壞，而微細(xì)鋼纖維磷酸鎂水泥砂漿疊層修復(fù)板的破壞形式為分叉多裂縫的韌性破壞；相同疊層厚度下，微細(xì)鋼纖維磷酸鎂水泥砂漿疊層修復(fù)板的承載力更高，其韌性和變形適應(yīng)能力更強(qiáng)，疊層修復(fù)效果更好；隨微細(xì)鋼纖維體積摻量增加，微細(xì)鋼纖維磷酸鎂水泥砂漿疊層修復(fù)板開(kāi)裂荷載和峰值荷載均緩慢增加；隨疊層厚度增加，微細(xì)鋼纖維磷酸鎂水泥砂漿疊層修復(fù)板的開(kāi)裂荷載、峰值荷載及峰值荷載對(duì)應(yīng)的跨中撓度均逐漸顯著增加。

［關(guān)鍵詞］微細(xì)鋼纖維； 磷酸鎂水泥； 裂縫捕捉； 疊層； 受彎試驗(yàn)

中圖分類(lèi)號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)08-0103-05

Experimental study on bending behavior of micro steel fiber magnesium phosphate cement mortar laminated restoration plate

Feng Hu, Wang Zhenyu, Gao Danying, Zhao Jun, Zhao Kunpeng

(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China)

Abstract:Magnesium phosphate cement, ordinary Portland cement, fast-hardening sulphoaluminate cement and micro steel fibers were used to prepare laminated restoration materials. The effects of lamination thickness, volume fraction of micro steel fibers and type of cement on the flexural properties of laminated restoration plates were investigated by bending experiments. The results show that under bending load, the failure mode of common concrete laminated restoration plate is brittle fracture at mid-span. The failure mode of traditional micro steel fiber cement (ordinary Portland cement and fast-hardening sulphoaluminate cement) mortar laminated restoration plate is ductile failure at mid-span with multi-cracks, while the failure mode of micro steel fiber magnesium phosphate cement mortar laminated restoration plate is fracture toughness failure bifurcated with multi-crack. Under the same lamination thickness, the laminated restoration plate with micro steel fiber magnesium phosphate cement mortar has higher bearing capacity, stronger toughness and deformation adaptability, and better lamination restoration effect. With the increase of volume fraction of microsteel fibers, the cracking load and peak wad of the laminated restoration plate with micro steel fiber magnesium phosphate cement mortar increases slowly. With the increase of lamination thickness, the cracking load, peak load and mid-span deflection corresponding to peak load of micro steel fiber magnesium phosphate cement mortar laminated restoration plate increase gradually.

Keywords:micro steel fiber; magnesium phosphate cement; crack capture; lamination; bending experiment

*國(guó)家自然科學(xué)基金（51308504），河南省科技攻關(guān)項(xiàng)目（152102310068），河南省高等學(xué)校青年骨干教師培養(yǎng)計(jì)劃。

作者簡(jiǎn)介：馮虎，博士，副教授，碩士生導(dǎo)師，Email: fenghu@zzu.edu.cn。