Under The Action Of Freeze-thaw Cycle Cement Asphalt Compound Mucilage Mechanical Properties Research

Cement asphalt compound mucilage(Referred to as C A compound mucilage) consists of cement, emulsified asphalt and various admixture after cementation hardening formed a kind of organic- inorganic composite materials. C urrent C A composite mucilage is mainly used plate without a frantic jumble orbit in high- speed railway and semi flexib le roadbed material. Freeze- thaw cycle effect will influence the macro mechanical properties of C A composite mucilage, in turn affect the asphalt cement mucilage and semi flexible pavement composite materials service performance. Along with our country cold region, the opening of the high- speed rail, CA compound mucilage freeze-thaw durability problems has become the focus of the present study. In the light of the above engineering background, this article main research content is as follows.First of all, establishment the CA compound mucilage viscoelastic constitutive model and equation, Identified under the action of freezing and thawing C A compound mucilage mechanics performance test method. Derived complex modulus and the expressions of the creep compliance of C A composite mucilage, proportion of material of C A composite mucilage is determined. Study to determine the C A compound muc ilage static strength properties, dynamic mechanical properties and freeze-thaw cycle test method, under the condit ion of fast freezing and thawing C A compound mucilage relative loss modulus and the law of mass loss were analyzed.Secondly, established under the action of freezing and thawing C A compound mucilage static constitutive equation, analyzes the freeze- thaw cycle, temperature and the ratio of material and other factors effect on mechanical properties of C A composite mucilage. Based on the different freezing and thawing times and different temperature conditions, creep test of C A compound mucilage, combined with generalized K evin model and fractional derivative model establish constitutive equation, analyzed the instantaneous elastic modulus and viscoelastic material proportion coefficient material performance parameter changing with the number of freezing and thawing, analyzes the factors such as temperature and the ratio of material on the mechanical behavior of composite mucilage CA coupling effects.Once again, based on dynamic frequency scanning test, established under the action of freezing and thawing C A compound muc ilage dynamic constitutive equation of mucilage, analyzed the influence factors of dynamic mechanical properties, By using the fractional derivative model and 3 chain K evin model describes the actual frequency range dynamic mechanical behavior of materials, analysis of instantaneous elastic modulus, the tendency of the viscoelastic proportion coefficient; By using 13 chain K evin model describe dynamic mechanical behavior extended frequency range, analyzing the instantaneous parameters such as elastic modulus and phase Angle. Research on factors such as temperature and t he ratio of material effect on dynamic mechanical properties of C A composite mucilage.Finally, established C A compound mucilage creep damage constitutive equation, analyzed under the action of freezing and thawing circulation C A compound mucilage, evolut ion law of pore structure. Studied under the condition of considering the material damage mechanics of materials performance parameter change rule, analys is C A compound mucilage mechanics performance parameters change with freezing and thawing t imes of pred iction formula. Using mercury injection test analys is after freeze-thaw cycle effect C A compound mucilage pore structure change law, preliminary analysis under the action of freezing and thawing circulation evolution mechanis m of C A compound mucilage macro mechanical properties.