磷酸鈉對堿礦渣水泥水化行為影響研究
[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)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TQ172.1
【相似文獻(xiàn)】
相關(guān)期刊論文 前10條
1 王善拔;;用礦化劑延長熟料的凝結(jié)時間[J];水泥;1987年07期
2 屈鋒;林小松;;礦渣摻量對鋼纖維噴射混凝土凝結(jié)時間的影響[J];煤炭工程;2006年10期
3 徐超,秦德權(quán);影響水泥市場競爭力的三個技術(shù)因素——早期強(qiáng)度、凝結(jié)時間、水泥顏色[J];山東建材;2001年03期
4 藍(lán)興權(quán),戴鳳連,巫藝花;水泥物理檢驗(yàn)中操作對凝結(jié)時間和細(xì)度的影響[J];水泥;2004年06期
5 韋紅焰;影響水泥市場競爭力的三個技術(shù)因素─—談水泥早強(qiáng)、凝結(jié)時間、顏色的變化及控制[J];山東建材;1994年06期
6 沈衛(wèi),劉昌勝,顧燕芳;磷酸鈣骨水泥的水化反應(yīng)、凝結(jié)時間及抗壓強(qiáng)度[J];硅酸鹽學(xué)報;1998年02期
7 張鋒;;水泥中不可忽視的一項重要技術(shù)指標(biāo)-凝結(jié)時間[J];北方交通;2007年09期
8 賈屹海;韓敏芳;孟憲嫻;許澤勝;;粉煤灰地質(zhì)聚合物凝結(jié)時間的研究[J];硅酸鹽通報;2009年05期
9 樊粵明,,鐘景裕,呂輝,楊家智,陳忠武;含氟硫A礦的水化特性[J];華南理工大學(xué)學(xué)報(自然科學(xué)版);1996年03期
10 王慶珍;錢覺時;秦繼輝;尤超;汪宏濤;;環(huán)境溫度對磷酸鎂水泥凝結(jié)時間和強(qiáng)度發(fā)展的影響[J];硅酸鹽學(xué)報;2013年11期
相關(guān)會議論文 前7條
1 張日華;張戰(zhàn)營;唐何春;魏松;王勇;;大摻量粉煤灰特種水泥的研制[A];中國首屆商品粉煤灰及磨細(xì)礦渣加工與應(yīng)用技術(shù)交流大會論文集[C];2003年
2 楊義;蔣杉平;陳洪韜;陳向榮;李青川;馬紅茹;;水化非常早期水泥漿體尺寸變化及其與凝結(jié)時間關(guān)系的研究[A];2012年中國水泥技術(shù)年會暨第十四屆全國水泥技術(shù)交流大會論文集[C];2012年
3 盛廣宏;程麟;;磷渣對硅酸鹽水泥凝結(jié)時間的影響及機(jī)理研究[A];中國硅酸鹽學(xué)會2003年學(xué)術(shù)年會論文摘要集[C];2003年
4 郭文瑛;吳笑梅;樊粵明;;顆粒分布對水泥標(biāo)準(zhǔn)稠度、凝結(jié)時間的影響[A];中國硅酸鹽學(xué)會2003年學(xué)術(shù)年會水泥基材料論文集(上冊)[C];2003年
5 盛廣宏;程麟;;磷渣對硅酸鹽水泥凝結(jié)時間的影響及機(jī)理研究[A];中國硅酸鹽學(xué)會2003年學(xué)術(shù)年會水泥基材料論文集(上冊)[C];2003年
6 田育功;;溫度、VC值及外加劑對碾壓混凝土凝結(jié)時間影響探討[A];慶祝廣西水利廳成立50周年專輯[C];2004年
7 汪春榮;李春;喬寶;周明凱;;石膏對礦渣路面基層水泥性能的影響[A];2014中國建筑材料聯(lián)合會石膏建材分會第五屆年會暨第九屆全國石膏技術(shù)交流大會及展覽會論文集[C];2014年
相關(guān)重要報紙文章 前1條
1 林宗壽;為何水泥放置一段時間后凝結(jié)時間會產(chǎn)生變化[N];中國建材報;2008年
相關(guān)碩士學(xué)位論文 前2條
1 曹勇;水泥混凝土路面多功能快速修補(bǔ)材料研究[D];長沙理工大學(xué);2012年
2 張武龍;磷酸鈉對堿礦渣水泥水化行為影響研究[D];重慶大學(xué);2015年
本文編號:2348083
本文鏈接:http://sikaile.net/kejilunwen/huaxuehuagong/2348083.html