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Studies of High Strength and Performance Compound Concrete

Author: LuYouJun
Tutor: MengYunFang;SunQingHe
School: Ningxia University
Course: Water Resources and Hydropower Engineering
Keywords: High Performance Concrete Compressive strength Mineral admixtures Admixtures
CLC: TU528.3
Type: Master's thesis
Year: 2004
Downloads: 357
Quote: 2
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Abstract


Concrete is the most widely used in the Civil and Hydraulic Engineering material strength is its most important mechanical properties. This is because the concrete structures are mainly used to bear the load or resistance to a variety of forces. Engineering with other properties, such as impermeability, frost resistance and abrasion resistance of concrete. But often there is a close link between these properties and strength of concrete. In general, the higher the strength of concrete, the larger the elastic modulus, the higher the ability of impermeability, frost resistance, and resistance to weathering and aggressive medium; the other hand, the strength is higher, often Shrinkage is also more while more brittle and easy to crack. Therefore, the common concrete strength assessment and quality control of concrete evaluation of various factors, and impact indicators. Compressive strength is as divided concrete grade standard. Concrete buildings exist in the western region, through the full use of industrial waste residue (gangue, fly ash, slag) resources of the Ningxia region, combined with admixtures, mixed with a certain amount of silica fume concrete by orthogonal test design, analysis of variance, macro and micro combined to determine the optimal mixture ratio between the four, the preparation of a composite high performance concrete work good performance, and study of its strength and performance. The following conclusions: (1) through the test confirmed that the The gangue amount of optimization to achieve the best match, you can improve the compressive strength of concrete and silica fume 5% and gangue gangue mixed with silica fume incorporation (15 %), 28d compressive strength of concrete compressive strength than the reference concrete 28d 3.6% silica fume can stimulate the gangue activity reinforced concrete early strength. (2) coal gangue with a variety of mixed wood composite and increase the strength significantly, 28d compressive strength of concrete optimal fit the ratio is A 1 B 2 C 2 D 2 E 2 F 2 . 28d tensile strength optimal fit than as A 1 B 2 C 2 D 2 the E 2 F 2 . (3) Based on Orthogonal test analysis of variance results: water glue significantly affect height than 28d strength of the concrete, admixtures and gangue 28d compressive strength of concrete significantly 28d strength of the concrete, slag has some influence. (4) by means of a complex of several hybrid material doped concrete compressive strength testing and analysis obtained under the conditions of this study the optimal ratio of complex mixture concrete: A 1 B 2 C 2 D 2 E 2 28d compressive strength 60.4Mpa. (5) complex silica fume, fly ash, ground slag and gangue on the one hand to improve the particle gradation, on the other hand, silica fume, fly ash, slag and coal gangue hydration process of the formation of a pore-filling complementary so complex mixture concrete exhibit composite complementary effects. (6) high-performance concrete is a multicomponent composite materials, the performance of each component additive effect was very obvious. Therefore, the choice of two or more mineral admixture plus two or more admixtures simultaneously complex doped to further improve performance and obtain certain characteristics '6. A. The the test doped four mineral admixtures plus two admixtures (superplasticizer and air-entraining agent) at the same time Admixed get better results. The study of the project, both to improve the strength and durability properties of concrete, and the use of large amounts of waste, reducing the project cost, and the protection of the ecological environment. Also alleviate the huge resources, energy requirements of large-scale development of the western region. Therefore, the research and promotion of the project have a wide range of theoretical and practical value, incalculable economic and social benefits.

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