【摘要】：裝配式建筑已進(jìn)入快速發(fā)展期,為了保證裝配式建筑的整體性及構(gòu)件連接的強(qiáng)度,需要對預(yù)制構(gòu)件鋼筋套筒進(jìn)行注漿連接。低溫套筒灌漿料是適宜在寒冷氣候條件下使用的灌漿材料,其主要目的是加快低溫環(huán)境下的水泥水化速度。通過引入復(fù)合水泥的概念,研究了普通硅酸鹽水泥、高鋁水泥、硫鋁酸鹽水泥復(fù)合使用的特性,進(jìn)而以復(fù)合水泥為水泥凝膠材料,根據(jù)探索性試驗結(jié)果確定了基本配比:膠砂比為1.0,水膠比為0.28。利用基本配比進(jìn)行礦物摻合料的單摻試驗和正交試驗,試驗研究結(jié)果表明,硅灰摻量為4%時效果最好,摻入適量石膏有利于減小水泥收縮,有微膨脹的效果。在單摻石膏試驗中大致確定其用量范圍為11~13%。將石膏與同樣具有緩凝、促凝作用的酒石酸、碳酸鋰進(jìn)行正交試驗,得到的最優(yōu)組合為:石膏摻量:12%、酒石酸摻量:0.16%、碳酸鋰摻量:0.12%。摻加防凍劑,可以降低冰點,促進(jìn)水泥水化。試驗開始選取了硝酸鈉、甲酸鈣、硫酸鈉作為防凍劑,進(jìn)行單摻和正交試驗。正交試驗發(fā)現(xiàn)甲酸鈣、硫酸鈉對流動度影響很大,無法滿足要求。最后選擇對流動度影響最小的硝酸鈉作為防凍劑,其最優(yōu)摻量為0.4%。通過試驗優(yōu)化,最終確定低溫套筒灌漿料的配比為:普通硅酸鹽水泥(PO 52.5)占復(fù)合水泥的70%、高鋁水泥占復(fù)合水泥的20%、硫鋁酸鹽水泥占復(fù)合水泥的10%,硅灰占膠凝材料的4%,石膏摻量占膠凝材料的12%,膠砂比為1∶1,用水量占膠凝材料的28%,酒石酸摻量為0.16%,碳酸鋰摻量為0.16%,硝酸鈉摻量為0.4%,適量聚羧酸型減水劑。根據(jù)具體使用要求研制出P-1和P-2兩種低溫套筒灌漿料,并對其豎向膨脹率、溫度影響、長期強(qiáng)度、氯離子含量進(jìn)行試驗。試驗表明,各方面性能均可滿足相關(guān)標(biāo)準(zhǔn)要求。低溫套筒灌漿料的成功研制,使鋼筋套筒注漿在冬季及寒冷地區(qū)施工成為可能,大大簡化冬季施工工序,節(jié)省成本。有利于裝配式建筑在寒冷地區(qū)的推廣。
[Abstract]:The prefabricated building has entered a period of rapid development. In order to ensure the integrity of the assembly building and the strength of the member connection, the grouting connection of the prefabricated steel bar sleeve is needed. Low temperature sleeve grouting material is suitable for use in cold climates, and its main purpose is to accelerate the hydration rate of cement in low temperature environment. By introducing the concept of composite cement, the characteristics of common Portland cement, high alumina cement and sulphoaluminate cement are studied, and the composite cement is used as cement gel material. According to the result of exploratory test, the basic ratio is determined: the ratio of cement to sand is 1.0, and the ratio of water to binder is 0.28. The single admixture test and orthogonal test of mineral admixture with basic ratio were carried out. The experimental results showed that the best effect was obtained when the amount of silica fume was 4, and the addition of proper amount of gypsum was beneficial to reduce the shrinkage of cement and have the effect of slight expansion. In the test of single gypsum, the dosage range is approximately determined to be 1113%. The optimum combination of gypsum and tartaric acid and lithium carbonate, which has the same retarding and coagulating effect, is obtained by orthogonal experiment. The optimum combination is: gypsum content: 12: 12, tartaric acid content: 0.16%, lithium carbonate content: 0.12. The optimum combination is: gypsum content: 12%, tartaric acid content: 0.16%, lithium carbonate content: 0.12. The addition of antifreeze can reduce the freezing point and promote the hydration of cement. Sodium nitrate, calcium formate and sodium sulfate were selected as antifreeze at the beginning of the experiment. Orthogonal test showed that calcium formate and sodium sulfate had great influence on fluidity and could not meet the requirements. Finally, sodium nitrate, which has the least effect on fluidity, is chosen as antifreeze, and the optimum dosage is 0.4. By experimental optimization, Finally, the ratio of low temperature sleeve grouting material is determined as follows: ordinary Portland cement (PO 52.5) accounts for 70% of composite cement, high aluminum cement accounts for 20% of composite cement, sulphoaluminate cement occupies 10% of composite cement, silica fume accounts for 4% of cementing material, gypsum content accounts for 20% of composite cement, silica fume accounts for 4% of cementing material, and gypsum content accounts for 20% of composite cement. The ratio of cement to sand is 1: 1, the water consumption is 28%, the amount of tartaric acid is 0.16, the amount of lithium carbonate is 0.16 and the amount of sodium nitrate is 0.4, the amount of polycarboxylic acid type water reducer is moderate. Two kinds of low temperature sleeve grouting materials P-1 and P-2 were developed according to the specific application requirements, and the vertical expansion ratio, temperature effect, long-term strength and chloride ion content were tested. The test results show that all aspects of the performance can meet the requirements of relevant standards. The successful development of low temperature sleeve grouting material makes it possible to construct reinforced sleeve grouting in winter and cold area, greatly simplifies the construction procedure in winter and saves cost. It is propitious to popularize prefabricated buildings in cold areas.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU578

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