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With the rapid progress of modern science and technology, concrete is the most important composite material in the development history of civil engineering in Taiwan, and its status is even higher than that of steel structures. Recent years, the concept of sustainable development has gradually risen. How to save energy and reduce carbon emissions is the current goal of various countries. Also because the concrete has high compressive strength, durability and heat resistance after pouring, but the tensile strength and flexural strength of concrete are far lower than one-tenth of the compressive strength. In order to improve its shortcomings, this study uses Glass fiber and hearth stone and other Buzuolan materials are used to make cement mortar, discuss the verification of engineering and durability properties of freshly mixed cement with different water-binder ratios, ages, and different ratios of glass fiber additions, hoping to improve the engineering and durability of traditional concrete. The goal of resource material recycling and reuse.
In this study, cement mortar specimens were made by fixing 20% furnace stone powder instead of cement and adding two kinds of waste glass fiber additions (0%, 0.2%, 0.4% and 0.6%) respectively, and placed them in saturated lime water. The ratio of water to cement (0.4, 0.5 and 0.6), four ages and the amount of glass fiber are used to study the fresh mix, hardness, durability and microscopic properties, and then discuss the advantages and disadvantages of adding two kinds of glass fiber in terms of engineering properties and durability. To evaluate the feasibility of adding glass fiber to cement mortar, the research results show that the compressive strength, flexural strength and The decrease in tensile strength is low, and when the glass fiber addition is 0.2%, the decrease in strength is the lowest, which can effectively solve the problem of waste reduction.
The research results show that the addition of glass fiber materials increases, the freshness tends to decrease, and the overall workability decreases, but as the age increases, the pores of the test body gradually become denser, and the water absorption, ultrasonic wave velocity, and sulfate resistance all have an upward trend. , when the water-binder ratio is 0.4, the surface resistance at the age of 28 days is greater than the durability range of 20k-cm. Although the durability property gradually decreases after adding glass fiber, the ultrasonic wave speed can exceed 4500m when the water-binder ratio is 0.4, it shows that although the addition of glass fiber will reduce the compactness of the test body, it can maintain the durability of cement mortar in the late age.
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