【摘要】：堿礦渣水泥是利用堿金屬化合物激發(fā)冶金工業(yè)廢渣形成的一種水硬性膠凝材料,具有優(yōu)良的物理力學(xué)性能及抗化學(xué)侵蝕性能。然而,堿礦渣水泥凝結(jié)速度過(guò)快,現(xiàn)場(chǎng)施工困難。Na3PO4對(duì)堿礦渣水泥凝結(jié)時(shí)間有顯著影響,但影響規(guī)律存在爭(zhēng)議,作用機(jī)理尚不明確。本文研究了水膠比0.29為條件下,Na3PO4與Na OH水玻璃(模數(shù)固定為2.5)組成的復(fù)合堿組分堿礦渣水泥的凝結(jié)時(shí)間、流動(dòng)度經(jīng)時(shí)損失和強(qiáng);采用TAM air微量熱儀測(cè)試了復(fù)合堿組分堿礦渣水泥的水化放熱行為。應(yīng)用Knudson水化熱模型及Jander方程,分析了復(fù)合堿組分對(duì)堿礦渣水泥水化動(dòng)力學(xué)過(guò)程。采用XRD和SEM測(cè)試手段,分析了復(fù)合堿組分堿礦渣水泥的水化產(chǎn)物及微觀結(jié)構(gòu)。探討了Na3PO4堿礦渣水泥水化行為機(jī)理。研究表明:復(fù)合堿組分中,Na3PO4相對(duì)摻量對(duì)堿礦渣水泥凝結(jié)時(shí)間有顯著影響。Na3PO4-Na OH復(fù)合堿組分中,Na3PO4相對(duì)摻量低于20%,增強(qiáng)礦渣顆粒間連續(xù)性,堿礦渣水泥表現(xiàn)為緩凝;相對(duì)摻量高于80%,Na3PO4與Na OH共同析出,堿礦渣水泥表現(xiàn)為促凝。Na3PO4-水玻璃復(fù)合堿組分中,Na3PO4相對(duì)摻量低于20%,降低堿礦渣水泥早期水化程度,堿礦渣水泥表現(xiàn)為緩凝;相對(duì)摻量高于80%,Na3PO4與水玻璃共同析出,堿礦渣水泥表現(xiàn)為促凝,并導(dǎo)致水泥漿長(zhǎng)時(shí)間不硬化。復(fù)合堿組分中,Na3PO4相對(duì)摻量對(duì)堿礦渣水泥水化過(guò)程有重要影響。Na3PO4-Na OH復(fù)合堿組分中,Na3PO4相對(duì)摻量低于20%,復(fù)合堿組分中水化放熱速率小。從水化動(dòng)力學(xué)參數(shù)可知,加速期反應(yīng)速率小,反應(yīng)由致密層擴(kuò)散控制,增大了堿礦渣水泥早期水化反應(yīng)阻力,減速期與衰減期由多孔擴(kuò)散和致密擴(kuò)散雙重控制;相對(duì)摻量高于80%,堿礦渣水泥水化放熱量小,堿組分對(duì)礦渣激發(fā)效果弱。Na3PO4-水玻璃復(fù)合堿組分中,Na3PO4相對(duì)摻量低于20%,削弱了誘導(dǎo)前期放熱峰,延長(zhǎng)加速期開(kāi)始時(shí)間。從水化動(dòng)力學(xué)參數(shù)可知,堿礦渣水泥加速期受致密擴(kuò)散控制,減速期與衰減期由多孔擴(kuò)散和致密擴(kuò)散雙重控制,反應(yīng)速率常數(shù)隨反應(yīng)的進(jìn)行而逐漸增大;相對(duì)摻量高于80%,堿礦渣水泥無(wú)法正常水化。Na3PO4復(fù)合堿組分堿礦渣水泥早期水化產(chǎn)物中無(wú)Ca3(PO4)2晶體生成。Ca3(PO4)2不是引起堿礦渣水泥緩凝的原因。
[Abstract]:Alkali slag cement is a kind of hydraulic cementitious material which is formed by using alkali metal compounds to excite metallurgical industrial waste slag. It has excellent physical and mechanical properties and chemical erosion resistance. However, the setting speed of alkali slag cement is too fast and the field construction is difficult. Na3PO4 has a significant influence on the setting time of alkali slag cement, but the law of influence is controversial, and the mechanism of action is not clear. Under the condition of water-binder ratio 0.29, the setting time and fluidity loss and strength of alkali slag cement composed of Na3PO4 and Na OH sodium silicate (fixed modulus 2.5) were studied. TAM air microcalorimeter was used to measure the hydration heat release behavior of alkali slag cement. Knudson hydration heat model and Jander equation were used to analyze the hydration kinetics of alkali slag cement. The hydration products and microstructure of alkali-mixed slag cement were analyzed by means of XRD and SEM. The hydration mechanism of Na3PO4 alkali slag cement was discussed. The results show that the relative content of Na3PO4 has a significant effect on the setting time of alkali slag cement in the compound alkali component, and the relative content of Na3PO4 in the Na3PO4-Na OH compound alkali component is lower than 20%, which enhances the continuity between the slag particles, and the alkali slag cement exhibits retarding coagulation. The relative content of Na _ 3PO _ 4 and Na OH precipitated together, and the alkali slag cement showed accelerated coagulation. In the compound alkali component of Na3PO4- water glass, the relative content of Na3PO4 was lower than 20, which reduced the hydration degree of alkali slag cement at early stage, and the alkali slag cement showed retarding coagulation. When the relative content of Na _ 3PO _ 4 is higher than 80% Na _ 3PO _ 4 and sodium silicate precipitate together, the alkali slag cement can accelerate coagulation and cause the cement slurry not to harden for a long time. The relative content of Na3PO4 plays an important role in the hydration process of alkali slag cement. The relative content of Na3PO4 is lower than 20 in the composition of Na3PO4-Na OH, and the hydration heat release rate is small in the compound alkali component. From the kinetic parameters of hydration, it can be seen that the reaction rate in accelerated period is small and the reaction is controlled by dense layer diffusion, which increases the resistance of early hydration reaction of alkali slag cement, and the deceleration period and attenuation period are both controlled by porous diffusion and densification diffusion. The hydration heat release of alkali slag cement is small, and the activation effect of alkali component on slag is weak. The relative content of Na3PO4 is lower than 20% in Na3PO4- sodium glass compound alkali component, which weakens the exothermic peak in the early stage of induction and prolongs the start time of acceleration period. According to the hydration kinetic parameters, the accelerated period of alkali slag cement is controlled by densification diffusion, the deceleration period and attenuation period are controlled by porous diffusion and densification diffusion, and the reaction rate constant increases gradually with the reaction. The alkali slag cement can not be hydrated normally when the relative content is higher than 80%. There is no Ca3 (PO4) _ 2 crystal formation in the early hydration product of Na3PO4 compound alkali slag cement. Ca3 (PO4) _ 2 is not the cause of the retarding of alkali slag cement.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ172.1

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