本文選題：快凝快硬高強混凝土　切入點：超早強劑　出處：《重慶大學》2014年碩士論文　論文類型：學位論文

【摘要】：早強、超早強混凝土具有凝結時間短、早期強度高且耐久性良好等特點而廣泛用于混凝土路面、機場跑道等需要快速修補的工程以及海港碼頭、橋梁隧道等快速搶修搶建工程。傳統(tǒng)的配制方法是采用特種水泥或特殊工藝，制備的混凝土通常后期強度倒縮嚴重，同時由于原材料價格昂貴、工藝復雜等原因而不適于工程推廣應用。本課題旨在采用常規(guī)原材料及普通工藝，研制出凝結時間適宜施工、早期強度高、長期強度不倒縮且耐久性良好的混凝土。 本試驗以超早強混凝土制備技術和高強混凝土制備技術為基礎，提出了利用42.5R普通硅酸鹽水泥摻適量的硅灰，加入自行配制的由快凝早強組分和減水組分組成的超早強劑，制備出快凝快硬高強混凝土的新途徑。采用常規(guī)的原材料及通用的工藝方法(強制攪拌+振動密實)，制備出初凝時間不小于30min，終凝時間不大于60min，6h抗壓強度10MPa，抗折強度1.5MPa，1d抗壓強度40MPa，抗折強度5MPa，28d抗壓強度80MPa，，抗折強度10MPa的快凝快硬高強混凝土。同時，研究了快凝早強組分對水泥凈漿凝結時間的影響；膠凝材料總量、硅灰摻量、減水組分種類、快凝早強組分摻量及內部組分比、水膠比等對混凝土凝結時間和早期強度的影響。 分別利用快速凍融循環(huán)試驗和硫酸鹽干濕循環(huán)試驗研究了所制備快凝快硬高強混凝土的抗凍性能和抗硫酸鹽侵蝕性能。結果表明：經歷500次快速凍融循環(huán)后，混凝土質量損失率未超過2%，抗壓強度損失率未超過15%；經歷120次硫酸鹽干濕循環(huán)后，混凝土質量不但未損失反而增大，相對抗蝕系數未低于75%。故而本試驗所制備混凝土抗凍性能和抗硫酸鹽侵蝕性能良好。 通過XRD和TG-DSC分析，研究了本試驗所用自制超早強劑對水泥水化硬化過程的影響，從而從微觀層面解釋本試驗用自制超早強劑的快凝早強機理。
[Abstract]:Early strength, super early strength concrete has the characteristics of short setting time, high early strength and good durability, and it is widely used in concrete pavement, airport runway and other projects requiring rapid repair, as well as harbor wharf. The traditional preparation method is to adopt special cement or special technology. The concrete prepared usually has a severe shrinkage in later stage, and because of the high price of raw materials, The purpose of this project is to develop concrete with suitable setting time, high early strength, long term strength and good durability by using conventional raw materials and common technology. On the basis of ultra-early strength concrete preparation technology and high strength concrete preparation technology, this paper puts forward that 42.5R ordinary Portland cement is mixed with proper amount of silica fume, and a self-made super early strength agent consisting of fast setting early strength component and water reducing component is added. A new way to produce fast solidification and fast hardening high strength concrete is presented. The initial setting time is not less than 30 min, the final setting time is not more than 60 min or 6 h compressive strength 10 MPA, and the bending resistance is not less than 10 MPA using conventional raw materials and general process (forced agitation vibration compaction). The compressive strength is 1.5 MPA / 1 d, the compressive strength is 40 MPA, the flexural strength is 5 MPA / 28 days, the compressive strength is 80 MPA and the flexural strength is 10 MPA. The effects of early strength components on the setting time of cement paste, the total amount of cementitious materials, the content of silica fume, the types of water reducing components, the content of early strength components, the ratio of internal components and the ratio of water to binder on the setting time and early strength of concrete were studied. The freeze resistance and sulfate corrosion resistance of fast solidified fast hardening high strength concrete were studied by rapid freeze-thaw cycle test and sulphate dry wet cycle test respectively. The results showed that the rapid freeze-thaw cycle experienced 500 rapid freeze-thaw cycles. The mass loss rate of concrete is not more than 2 and the loss rate of compressive strength is not more than 15. After 120 sulphate dry and wet cycles, the quality of concrete not only increases, but also does not lose. The corrosion coefficient of phase resistance is not lower than 75. Therefore, the frost resistance and sulfate corrosion resistance of concrete prepared in this experiment are good. By means of XRD and TG-DSC analysis, the effect of the self-made super early strength agent on the hydration and hardening process of cement was studied, and the mechanism of quick solidification and early strength of the self-made super early strength agent was explained from the microscopic level.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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