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The Study on the Properties of Fiber Reinforced Mortar Mixed with Modified Waste Rubber Power

Author: ZhaoZhongXing
Tutor: ZhangSongYu
School: Harbin Institute of Technology
Course: Materials Science
Keywords: fiber reinforced rubberized mortar waste rubber powder surface modification fiber-reinforced stress-strain relation SEM
CLC: TQ177.6
Type: Master's thesis
Year: 2009
Downloads: 47
Quote: 0
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Abstract


The quantities of scrap tires increase quickly with the growing amount of cars and become a new environmental pollution source. Utilizing tire rubber powder in cement concrete is significant for recycling of scrap tires, saving resource and improving properties of cement concrete.Waste rubber powder is modified by different modifiers, then fiber reinforced rubberized mortar with a certain function is developed by adding different amount of waste rubber power and fiber. Through the strength, toughness, SEM and other related tests, the effect of the different modifiers, fiber content and length, the amount of rubber powder and particle size on the fiber-reinforced mortar performance are analyzed. The stress-strain curve of rubber mortar is tested, and then fitted into a curve equation.The results show that: the compressive and flexural strength of the rubberized mortar significantly decrease due to incorporation of rubber power which is not surface modified, while the surface is modified the mechanical properties of the mortar is significantly improved. Compressive strength of mortar with waste rubber powder modified with C increases 36%, flexural strength increases 23%, the interface between cement matrix and rubber power becomes better by the surface modification of rubber powder through SEM. Compressive strength of fiber-reinforced mortar changes not obviously, while flexural strength increases. The higher the aspect ratio of the fiber is, the better its effect is. When the amount of waste powder increases, compressive strength and flexural strength decrease. When waste powder particle size decreases, flexural strength and compressive strength increase. The composite role of the fibers and rubber powder makes the decline trend of strength of mortar slow. The ratio of flexural strength and compressive strength increases with the increasing amount of waste powder. When the amount of waste rubber powder is about 30%, the impact toughness of the rubberized mortar rises to the highest point, while the size of waste rubber powder decreases, the impact toughness increases.Stress-strain curves show that the ranges of compressive stress and the elastic modulus of mortar decrease with the increasing strain after mixing waste rubber powder. The breakage energy of mortar mixing with waste rubber powder increases when the amount of waste powder increases, or particle size of waste rubber powder decreases. Compressive load limit decreases when the amount of waste rubber powder increases, but the corresponding strain increases, limit load increases when particle size decreases. Equation is obtained by fitting curve, and through the theory curve and test curve, the model is basically fulfilled.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Artificial stone and other cementitious materials > Building mortar
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