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Preparation and Performance of High Flowing Lytag Concrete

Author: ZhangAiLian
Tutor: DengHongWei
School: Harbin Institute of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Lytag concrete Rheological properties Mineral admixtures Mechanical Properties Durability
CLC: TU528.0
Type: Master's thesis
Year: 2007
Downloads: 203
Quote: 1
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Abstract


The characteristics of the Lytag Concrete is light weight, durability and good thermal insulation, reflecting the significant economic and social benefits. However, Lytag concrete because of its particularity in the composition and structure of (mainly lightweight aggregate light weight, low particle strength, rough and porous surface) make it difficult to have both the uniformity and the performance characteristics of the flow. Therefore, how to research and prepare a uniform large liquidity lightweight aggregate concrete has been a hot issue of research in this field, to carry out research in this area is undoubtedly an important sense, is bound to give a boost to the lightweight aggregate concrete in the large, important structural engineering wide range of applications. This article discusses the law of pure cement paste mixed with different proportions of slag, fly ash the mixed zeolite powder and silica fume slurry shear rate and shear stress with blending material proportional change. After the study of the rheological properties of cement paste, the ratio of lightweight high strength Lytag of concrete optimal choice. On this basis, the mechanical properties of concrete Lytag durability. The test results show that: (1) With the increase in the slag or fly ash, the plastic viscosity of the slurry reduced gradually increase the yield shear stress. (2) incorporation of silica fume plastic viscosity of cement paste after the first decrease after it reaches a certain dosage, When silica fume 8%, the plastic viscosity reaches a minimum, and later with increasing silica fume increases. (3) single doped zeolite powder or zeolite powder and silica fume Admixed the zeolite powder content increased, the plastic viscosity of the slurry increases gradually decreasing trend yield shear stress. (4) fly ash and silica fume complex doped with increasing fly ash, plastic viscosity of the slurry increases gradually decreasing trend yield shear stress. (5) slag and silica fume complex doped with increasing slag content, the plastic viscosity of the slurry decreases gradually tended to increase the yield shear stress. (6) single-doped mineral admixtures Lytag 28d compressive strength of the concrete order: silica fume gt; slag gt; fly ash. The complex doped mineral admixtures Lytag concrete 28d compressive strength order: silica fume slag gt; silica fume, fly ash gt; slag and fly ash. (7) the Lytag concrete elastic modulus lower than ordinary concrete; the peak strain the Lytag concrete value is greater than ordinary concrete. Single-sided (8) mixed with mineral admixtures Lytag concrete frost resistance of one side is much better than ordinary concrete frost resistance; the 56 mineral admixtures resistance sided antifreeze order: silica fume slag gt; silica fume, fly ash gt; slag and fly ash gt; silica fume gt; the fly ash gt; slag.

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