本文選題：復合早強劑 + 噴射混凝土�。� 參考：《蘭州交通大學》2015年碩士論文

【摘要】：搶險工程具有時效性,這就需要混凝土在較短的時間內(nèi)達到規(guī)定強度�；炷猎缙趶姸雀�,就能夠加快工程施工進度、防止災害影響擴大或減輕、消除災害影響。采用快硬性水泥可以達到快速凝結硬化、提高混凝土早期強度的目的,但是造價較高;在普通硅酸鹽水泥中加入早強劑,可以在低成本的情況下改善混凝土的工作性,并提高混凝土的早期強度,滿足搶險工程需求。本文分析了不同品種早強劑的優(yōu)缺點,得出混凝土工程中應限制使用氯鹽系列早強劑、不宜使用硅酸鹽系列早強劑、不建議使用鋰鹽早強劑的結論;早強劑的發(fā)展趨勢是復合早強劑取代單組分早強劑。通過水泥漿電阻率確定了復合早強劑的組成成分為三乙醇胺(T)、硫酸鈉(S)和亞硝酸鈉(N),并命名為TSN復合早強劑。研究三種早強劑組分的早強作用機理,分析出提高硅酸三鈣和硅酸二鈣的水化反應速度,關鍵在縮短水泥水化反應誘導期。通過正交設計,簡化了數(shù)據(jù)處理的難度,最終確定了三種組分的配比。經(jīng)過試驗室內(nèi)檢測項目的驗證,復合早強劑摻量為水泥質量的1.52%時能減少用水量、縮短水泥凝結硬化時間、提高混凝土的早期強度;與速凝劑、聚羧酸減水劑等有較好的適應性。應用在隧道塌方工程中,混凝土和易性較好,早期強度高。本文的研究成果:(1)復合早強劑的配比為:三乙醇胺(T)1.3%,硫酸鈉(S)65.8%,亞硝酸鈉(N)32.9%;(2)摻量為1.52%的情況下,能使混凝土的流動性最好,且混凝土強度最高;(3)混凝土早強效果明顯,1d齡期強度達到混凝土強度等級的50%,3d齡期強度達到混凝土強度等級的80%;(4)應用在噴射混凝土中,圍巖的粘結強度高于其他混凝土與圍巖的粘結強度、回彈率低于普通噴射混凝土的回彈率。
[Abstract]:Emergency engineering has timeliness, which requires concrete to reach the specified strength in a short time. If the concrete has high early strength, it can accelerate the construction progress, prevent the disaster influence from expanding or reducing, and eliminate the disaster impact. The use of fast hardening cement can achieve the purpose of rapid solidification and hardening and increase the early strength of concrete, but the cost is high; adding early strength agent to ordinary Portland cement can improve the workability of concrete at low cost. And improve the early strength of concrete to meet the needs of emergency engineering. This paper analyzes the advantages and disadvantages of different kinds of early strength agents and draws the conclusion that the use of chlorine salt series early strength agents should be restricted and silicate series early strength agents should not be used and lithium early strength agents should not be used in concrete engineering. The development trend of early strength agent is to replace one component early strength agent with composite early strength agent. Through the resistivity of cement slurry, the composition of the composite early strength agent was determined to be triethanolamine, sodium sulfate and sodium nitrite, and named as TSN compound early strength agent. The mechanism of early strength of three kinds of early strength agents was studied. The key to improve the hydration rate of tricalcium silicate and dicalcium silicate was to shorten the induction period of cement hydration reaction. The difficulty of data processing was simplified by orthogonal design, and the ratio of three components was determined. After testing in laboratory, it can reduce water consumption, shorten setting time and improve early strength of concrete when the content of composite early strength agent is 1.522wt% of cement quality. Polycarboxylic acid superplasticizer has good adaptability. In tunnel collapse engineering, the concrete is easy to use and the early strength is high. The results of this paper are as follows: the ratio of triethanolamine, sodium sulfate, sodium nitrite and sodium nitrite is 1.52%, and the fluidity of concrete is best when the ratio of triethanolamine, sodium sulfate and sodium nitrite is 1.52%. And the concrete strength is the highest, and the effect of early strength of concrete is obvious. When the 1d age strength reaches the concrete strength grade, the concrete strength reaches the concrete strength grade 80 / 4) and is used in the shotcrete. The bond strength of surrounding rock is higher than that of other concrete and the rebound rate is lower than that of ordinary shotcrete.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1805034