Effect of Combination of Steel Fiber and MgO-type Expansive Agent on Properties of Concrete

武汉理工大学学报-材料科学版(英文版), 2011, 26(4): 786-790. doi: 10.1007/s11595-011-0311-4

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China;Anhui key Laboratory of Advanced Building Materials,Anhui Institute of Architecture and Indu

2.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

3.Anhui key Laboratory of Advanced Building Materials,Anhui Institute of Architecture and Industry,Hefei,230022,China

4.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

5.No.95538 Troop of the Chinese People's Liberation Army,Chengdu,611431,China

6.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

Effect of Combination of Steel Fiber and MgO-type Expansive Agent on Properties of Concrete

WANG Aiguo ^1, , DENG Min ^2, , SUN Daosheng ^3, , MO Liwu ^4, , WANG Jun ^5, , TANG Mingshu ^6,

2.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

3.Anhui key Laboratory of Advanced Building Materials,Anhui Institute of Architecture and Industry,Hefei,230022,China

4.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

5.No.95538 Troop of the Chinese People's Liberation Army,Chengdu,611431,China

6.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,210009,China

Keywords： steel fiber

The effect of combination of steel fiber and MgO-type expansive agent(MEA)on strength,air-permeability and porosity of concrete was investigated.The porosity and air-permeability of concrete were determined by method of evaporated water and Torrent permeability tester,respectively.Pore structures of mortars in concrete were analyzed using mercury intrusion porosimetry(MIP).Interfacial structures between steel fibers and matrix were examined by use of optical microscope.The experimental results show that improvement of pore structures of mortar and fiber-matrix interfacial structure in concrete by combination of steel fiber and MEA may remarkably increase properties of concrete.In comparison with plain concrete,compressive strength and splitting tensile strength of steel fiber reinforced expansive concrete increased by 15.3% and 38.1%,permeability coefficient K(t),penetration depth L and porosity of concrete decreased by 41.1%,21.3% and 13.1% at 28 days,respectively.

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Effect of Combination of Steel Fiber and MgO-type Expansive Agent on Properties of Concrete

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