The Experimental Research On Durability Of The Cellulose Fiber Hydraulic Concrete

Hydraulic engineering in China mainly concentrate in the western region, whereare complicated geological conditions, winter low temperature and high water head,large volume. As a result the concrete used for in hydraulic engineering andhydropower engineering hydraulic have higher requirements in permeabilityresistance, frost resistance and durability. The panel concrete of earth and rock filldam due to the difference of its thickness is larger than the other two directions putsforward higher requirements on concrete. Many studies both at home and abroadsuggest that adding fiber in hydraulic concrete action can improve the durability ofhydraulic concrete, so the fiber’s influence on the durability of hydraulic concrete isof positive significance.Cellulose fiber is a new generation of high-tech materials, which has advantagesof high elastic modulus, easy to be spread, and the advantages of good bonding withconcrete. Suitable for road bridge, the lining wall, floors and other projects, Cellulosefibers are used in municipal, highways, tunnels, subways and thin-walled structure,construction engineering, especially have more applications in the passengerdedicated line in recent years in our country, but less in water conservancyengineering application in report. This issue for the first time in the rock-fill dampanel concrete adding cellulose fiber to improve the durability of hydraulic concrete.In this paper, the durability of cellulose fiber hydraulic concrete is studied by thesystematic testing. The basic mechanical properties, permeability resistance, frostresistance performance, performance of adiabatic temperature rise, self-grownvolume deformation and drying shrinkage performance are tested in the contrast testof hydraulic concrete mixed with different dosage of cellulose fiber and withoutcellulose fiber. The performance of cellulose fiber enhancement effect, evaluationmethod and mechanism were analyzed, and choose the best cellulose fiber content,which provides the basis for cellulose fiber application in water conservancy project.The results show that the cellulose fiber content in hydraulic concrete in0~1.5kg/m3low dosage, has no effect on the hydraulic concrete compressive strength; That can enhance the hydraulic concrete splitting tensile strength, permeability resistance,frost resistance performance; Reducing the number of hydraulic concrete shrinkagedeformation, self-grown volume deformation; But mixing the cellulose fiber willmake hydraulic concrete adiabatic temperature rise, affecting the durability ofhydraulic concrete. With increasing cellulose fiber dosage in0~1.5kg/m3low range,hydraulic concrete tensile strength increases gradually, the hydraulic permeabilityresistance and frost resistance of concrete performance are also increased, hydraulicself-grown volume deformation and dry shrinkage deformation of concrete decrease,but the hydraulic concrete adiabatic temperature rise with the increase of dosage.Based on the above test results, the optimum content of cellulose fiber was1.2kg/m3.In order to improve the performance of hydraulic concrete adiabatic temperature rise,is mixing in the cellulose fiber hydraulic concrete. Cellulose fiber and WHDF mixedwith hydraulic concrete, compared with separate mixed with cellulose fiber, canreduce the hydraulic concrete adiabatic temperature rise, improving the durability ofhydraulic concrete.