本文選題：城市污泥 + 觸變性　； 參考：《浙江工業(yè)大學》2015年碩士論文

【摘要】：自密實混凝土是一種新型高技術混凝土,經(jīng)特殊設計和添加增稠劑后,具有流動性好、不易分層離析等特點。常用增稠劑包括纖維素醚、溫倫膠、硅溶膠等,其抗離析效果明顯,但價格較昂貴。研究表明,城市污水處理廠污泥含有絮凝組分,預計可發(fā)揮對自密實混凝土的增稠作用。本文嘗試采用城市污水處理廠污泥作為增稠劑,對比研究了摻污水處理廠污泥和膏體溫倫膠對新拌和硬化自密實混凝土性能的影響,結果表明:(1)與摻加膏體溫倫膠相類似,摻污水處理廠原狀污泥對水泥凈漿流變性能和新拌自密實混凝土和易性影響均很大,可發(fā)揮增稠作用,但將原狀污泥烘干磨細后,其影響明顯減小。摻原狀污泥和烘干污泥均在水化前期對水泥水化具有促進作用,但在潛伏期和加速期均對水泥水化具有緩凝作用。(2)摻原狀污泥和溫倫膠均導致硬化自密實混凝土強度下降,但摻原狀污泥對硬化自密實混凝土強度的影響更明顯,實驗結果表明,污泥摻量為1.0%時,其對混凝土強度的影響最小。(3)摻溫倫膠有助于改善硬化自密實混凝土抗氯離子滲透性能。摻原狀污泥時,其對抗氯離子滲透性能的影響與摻量有關,摻量為1.0%時,抗氯離子滲透性能最佳,達到2.0%時又導致抗氯離子滲透能力下降。(4)摻膏體溫倫膠有助于改善砂漿孔結構分布,其孔隙率也略有減小,而摻加原狀污泥對混凝土孔結構分布及孔隙率均產(chǎn)生不利影響,但對平均孔徑影響較小,且增加的部分均屬于少害孔級。而摻加原狀污泥與溫倫膠均可明顯改善硬化水泥石和骨料-水泥石之間的界面過渡區(qū)微觀結構。(5)將污泥經(jīng)除臭處理后作為增稠劑加入到自密實混凝土中,對其流動性影響大大減小,間隙通過性有所改善,對強度的影響較原狀污泥要小。
[Abstract]:Self compacting concrete is a new type of high technology concrete. After special design and adding thickening agent, it has the characteristics of good fluidity and not easy to separate segregation. The commonly used thickening agent, including cellulose ether, thermo Lun gum and silica sol, has obvious anti segregation effect, but the price is more expensive. The research shows that the sludge contains flocculation components in the municipal sewage treatment plant. This paper tries to use the sludge of the municipal sewage treatment plant as a thickening agent to compare the effects of the sludge and the body temperature of the paste on the performance of the newly mixed and hardened self compacting concrete. The results show that: (1) it is similar to the addition of the paste, and the original sludge is mixed with the sewage treatment plant. It has great influence on the rheological properties of cement paste and the new mixing of self compacting concrete and easily. It can play a thickening effect, but the effect of the original sludge drying and grinding is obviously reduced. Both the original sludge and the drying sludge all have a promotion effect on the hydration of cement in the early stage of hydration, but the cement hydration is retarded in the incubation period and the accelerating period. (2) the strength of hardened self compacting concrete is reduced by the addition of raw sludge and warm glue, but the effect of mixing raw sludge on the strength of hardened self compacting concrete is more obvious. The experimental results show that when the amount of sludge is 1%, the effect of the sludge on the strength of concrete is minimal. (3) the addition of thermo glue can help to improve the resistance to chloride ion permeation of hardened self compacting concrete. When mixed with original sludge, the effect of admixture on the permeability of chloride ion is related to the dosage of chloride ion. When the dosage is 1%, the permeability resistance of chlorine ion is the best and the permeability resistance of chlorine ion is reduced when it reaches 2%. (4) the mixture of ointment thermoren glue helps to improve the distribution of pore structure of mortar, and its porosity is slightly reduced, and mixed with raw sludge is mixed. The structure distribution and porosity of the condensate hole have adverse effects, but the influence on the average pore size is small, and the increase part of the pore size belongs to the small damage hole grade. And the addition of the original sludge and the warm glue can obviously improve the microstructure of the interface transition zone between the hardened cement stone and the aggregate cement stone. (5) the sludge is deodorizing as a thickening agent after deodorization treatment. In self compacting concrete, its fluidity is greatly reduced, the permeability of the gap is improved, and the effect on strength is smaller than that of raw sludge.
【學位授予單位】：浙江工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703;TU528

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本文編號：1972520