高性能纖維水泥基復(fù)合材料的制備與優(yōu)化設(shè)計
[Abstract]:In this paper, the preparation and optimization design of a high performance fiber cement matrix composite (also known as engineering cement matrix composite, Engineering Cementitious Composites abbreviated as ECC) is studied in order to apply ECC to bridge reinforcement. First of all, different fibers, different fiber content, different water-binder ratio, different cement-fly ash ratio, different sand-binder ratio and mixed fiber were used to make ECC specimens, which revolved around the bending and drawing of ECC. The basic mechanical properties, such as compressive strength and mobility, were tested by four-point bending, direct tension, cube compressive strength test and table jumping test. Then, the effects of water-binder ratio, cement-fly ash ratio and sand-glue ratio on the effect of ECC spray construction were tested by using shotcrete machine, and the basic spray performance indexes, such as spray springback loss rate, smoothness and smoothness, were investigated. Using the same mix ratio, the spray specimen and pouring specimen of ECC were fabricated. The four-point bending and cube compressive strength tests were carried out, and the bending toughness, bending and compressive strength of spray and pouring specimens were compared. Finally, the bearing capacity advantages and cost advantages of ECC used in bending, shear and compression reinforcement of bridges are classified and discussed. The following analysis work is also carried out in this paper: (1) the load-displacement curve of ECC four-point bending test is analyzed, and the equivalent tensile strength, equivalent tensile strain and ASTM toughness index are extracted from the diagram, and the fiber types are obtained. The effects of fiber content, water-cement ratio, fly ash cement ratio, sand glue ratio and fiber mixture on the bending properties of ECC were analyzed. (2) the effects of water binder ratio and fly ash cement ratio on ECC jet smoothness, smoothness and adhesion were analyzed. On the basis of pouring ECC, it is concluded that how to make spray ECC by using differential mix ratio. (3) the bending, shear and compression reinforcement design of FRP grille reinforced ECC, bonded FRP material reinforcement method and section reinforcement method are carried out. Considering the actual service life of each reinforcement method, the concept of life cycle reinforcement cost is put forward. The single reinforcement cost and the whole life cycle reinforcement cost for each reinforcement method to achieve the same bending, shear and compressive reinforcement effect are calculated.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU528
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