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Comparison of Performance of Road Base Materials Made from Red Mud with Different Storage Time and Its Strength Mechanism
Author: ChenFan
Tutor: YangJiaKuan
School: Huazhong University of Science and Technology
Course: Environmental Engineering
Keywords: Sintered red mud. Road base materials Different stockpiling time Performance Comparison Strength Mechanism
CLC: U414
Type: Master's thesis
Year: 2007
Downloads: 74
Quote: 0
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Abstract
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This paper through a series of performance comparison experiments for three years by the different sintering of red mud (are stockpiling for three years, five years and more than a decade of red mud) prepared roadbed material performance comparison. Lime, fly ash, compaction factor orthogonal experiments, analysis of the impact of their strength. Both comparative tests and 32.5 ordinary portland cement, β-half-water gypsum admixtures comparative test through the composition of raw materials, analysis each component strength. Test a representative sample of the micro-analysis (X-ray diffraction, scanning electron microscopy and energy dispersive analysis), to investigate the strength of the red mud embankment formation mechanism. Performance comparison and orthogonal experiment results show that: in the red mud dosage accounted for more than 70% of the sum of the dry mass of raw materials of the case, the three types of red mud embankment materials seven days unconfined water-saturated compressive strength can meet the high-speed and The requirements of a highway on the compressive strength of the grass-roots. Three red mud embankment has a high early strength, and the raw material of red mud stockpiling the longer, more prepared subgrade engineering performance excellent. General construction conditions (95%) of the degree of compaction, the best raw materials with the ratio of red mud embankment three red mud: fly ash: lime = 75:15:10, five red mud deficit roadbed and more than a decade the mud embankment best raw materials with the ratio of 75:10:15. Factors influencing the strength of all the roadbed, lime is the most significant factor, increases strength significantly increased with the dose of lime effect of the three types of red mud embankment. The admixture of Comparative Test drawn, that the optimum dose of 1% of ordinary portland cement of 32.5, suitable admixture an amount of 1 to 3% beta-hemihydrate gypsum of the early effects of the latter is better. The microscopic analysis showed that: the formation of red mud embankment strength is a complex chemical reactions, physical - chemical reactions and physical - mechanical process of mutual influence and cross. Wherein the gel generated by the hydration reaction and crystallization (mainly calcium silicate hydrates), and the crystals are the main contributors to the strength. Instar growth as the roadbed of red mud, the formation of the colloids, crystal growing, grow gradually contact with each other, cross, filling, and will not participate in the chemical reaction of the particles bonded together to form a dense colloidal - Crystals space network skeleton structure, so that the roadbed mixture to obtain a stable strength. In real construction, due to three red mud raw solid particle agglomeration strength is low, the reaction is in the red mud and lime, fly ash among major role in the formation of roadbed strength; increase as the stockpiling of time, two calcium silicate cement class active ingredients gradually reduce the raw material of red mud, but the red mud particles the consolidation formation of the block reunion with a certain intensity, can produce a part of the aggregate effect of the red mud embankment through the red mud and lime Fly among the gelling action of the reunion of red mud block consolidation strength.
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