海工水泥的制備及其應(yīng)用的實(shí)驗(yàn)研究
發(fā)布時(shí)間：2018-07-17 04:09
【摘要】：自水泥混凝土材料問世以來,越來越多的學(xué)者對其應(yīng)用技術(shù)開展研究。21世紀(jì)是海洋的世紀(jì),海洋資源日益被人們發(fā)掘利用,海工混凝土構(gòu)筑物也隨之發(fā)展起來。與陸地環(huán)境不同的是,海洋環(huán)境介質(zhì)中含有大量有害物質(zhì),它們會(huì)通過混凝土保護(hù)層到達(dá)鋼筋周圍,毀壞鋼筋表面的鈍化膜,降低鋼筋與混凝土之間的粘結(jié)強(qiáng)度,不利于海工構(gòu)筑物的長期耐久性應(yīng)用,而且海工構(gòu)筑物一旦被破壞,極難甚至不能修復(fù)。鑒于資源、經(jīng)濟(jì)和安全等因素,提高混凝土構(gòu)筑物的長期耐久性能已成為土木工程界研究的重點(diǎn),對海工水泥混凝土耐久性能的研究也顯得尤為重要。本論文以粉煤灰、礦粉和硅灰為混合材,通過對水泥砂漿物理性能、抗?jié)B性能、抗硫酸鹽侵蝕性能和氯離子擴(kuò)散系數(shù)等項(xiàng)目的檢測分析和實(shí)驗(yàn)研究,研發(fā)出一種具有高耐久性能的海工水泥。以偏高嶺土、磨細(xì)石英砂、廢硅粉和漂珠為礦物外加劑,與化學(xué)外加劑(減水劑)復(fù)合使用,通過對混凝土工作性能、抗壓強(qiáng)度和氯離子擴(kuò)散系數(shù)等項(xiàng)目的檢測分析和實(shí)驗(yàn)研究,確定礦物外加劑-化學(xué)外加劑(減水劑)的最佳配比以及復(fù)合外加劑的適宜摻量。論文主要研究工作及成果如下:氯離子是造成鋼筋銹蝕的主要原因,因此,要嚴(yán)格控制混凝土原材料組成中的氯離子含量。分別對粉煤灰、礦粉、硅灰以及偏高嶺土、廢硅粉、磨細(xì)石英砂和漂珠等組分進(jìn)行化學(xué)分析,選用無氯離子的原料或氯離子含量小于0.06%的原料。對于所制備的海工硅酸鹽水泥,石膏具有很好的緩凝、增強(qiáng)作用。在CH存在的條件下,通過水化反應(yīng)消耗CH生成AFt產(chǎn)生微膨脹,不但可以提高水泥的強(qiáng)度,而且可以減小孔隙率,提高水泥體系的致密度,有效阻止外界環(huán)境中的有害物質(zhì)進(jìn)入水泥混凝土內(nèi)部。研究表明,石膏的最佳摻量為7%,當(dāng)石膏摻量過高時(shí),會(huì)因生成AFt過多而導(dǎo)致膨脹率過大,使水泥體系內(nèi)部產(chǎn)生微裂紋,對其強(qiáng)度和耐久性產(chǎn)生不利影響;硅灰為高活性超細(xì)粉,一方面可以參與水化反應(yīng)生成膠凝物質(zhì),提高水泥體系的強(qiáng)度,另一方面,可以充分發(fā)揮其物理填充作用,減小水泥體系的孔隙率,提高致密度。研究表明,硅灰的最佳摻量為4%,當(dāng)硅灰摻量過高時(shí),反應(yīng)所需的CH的含量不足,過量硅灰主要起物理填充作用,對強(qiáng)度和耐久性能改善的效果不明顯;粉煤灰和礦粉具有火山灰活性,此外,粉煤灰的微觀形態(tài)為玻璃微珠,能通過滾珠效應(yīng)而起到潤滑作用,提高水泥混凝土的工作性能。研究表明,粉煤灰的摻量不得超過16%,此時(shí),相應(yīng)的礦粉的摻量為40%,由此制備的水泥的物理性能和耐久性能良好,滿足海工水泥的國家標(biāo)準(zhǔn)。對海工混凝土復(fù)合外加劑的研究表明,以偏高嶺土-磨細(xì)石英砂-漂珠-廢硅粉為原料按照1:1:2:2的質(zhì)量比復(fù)合制成混凝土礦物外加劑,并以此礦物外加劑配制的海工混凝土具有良好的工作性能、較高的抗壓強(qiáng)度和較低的氯離子擴(kuò)散系數(shù),耐久性能良好;以聚羧酸減水劑為化學(xué)外加劑,與礦物外加劑復(fù)合使用,所配制的海工混凝土具有良好的粘聚性能、保水性能和工作性能,抗壓強(qiáng)度高,氯離子擴(kuò)散系數(shù)低,耐久性能好。
[Abstract]:Since the advent of cement concrete materials, more and more scholars have studied its application technology in the.21 century, the century of ocean, marine resources are increasingly exploited by people, and the marine concrete structures also develop. Unlike the terrestrial environment, the marine environment contains a large number of harmful substances, which will be coagulated by coagulation. The soil protection layer reaches the steel bar, destroys the passivation film on the surface of the steel bar, reduces the bond strength between the reinforcement and the concrete, is not conducive to the long-term durability application of the marine structures, and it is very difficult or impossible to repair the marine structures once they are destroyed. The long-term durability of concrete structures is improved in view of the factors such as resources, economy and safety. The research on the durability of marine cement concrete is also very important. This paper uses fly ash, mineral powder and silica fume as a mixture, and research and Research on the physical properties, impermeability, sulfate corrosion resistance and chloride diffusion coefficient of cement mortar. A kind of marine cement with high durability is issued. Using metakaolin, fine quartz sand, waste silica powder and floating beads as mineral admixtures, and chemical admixtures (water reducing agent), the chemical additives - chemical additives - chemical additives - chemical addition - chemical additives - chemical additives (water reducing agents) are used to determine the mineral admixtures - chemical additives. The best proportion of additive (water reducing agent) and the suitable admixture of compound admixture. The main research work and results are as follows: chlorine ion is the main cause of corrosion of steel bar. Therefore, the content of chloride ion in the composition of concrete is strictly controlled. The fly ash, mineral powder, silica fume, and metakaolin, waste silica powder and fine quartz sand The chemical analysis of the components, such as the floating bead and other components, is made of raw materials with no chloride ions or less than 0.06% of the chlorine ion content. For the prepared marine Portland cement, gypsum has a good retarding and enhancement effect. Under the condition of CH, the micro expansion of AFt is generated by the hydration reaction consumption of CH, not only the strength of the cement can be increased, but also the strength of the cement can be improved. It can reduce the porosity, increase the density of the cement system and effectively prevent the harmful substances from the external environment into the cement concrete. The study shows that the best dosage of gypsum is 7%. When the amount of gypsum is too high, the expansion rate will be too large because of the excessive amount of AFt, which causes the micro cracks in the cement system, and the strength and durability of the cement system. On the one hand, silica fume is highly active superfine powder. On the one hand, it can participate in hydration reaction to produce cementitious material and improve the strength of cement system. On the other hand, it can give full play to its physical filling effect, reduce the porosity of cement system and increase the density. The best dosage of silica fume is 4%, and the reaction is when the amount of silica fume is too high. The required content of CH is insufficient, excessive silica fume mainly plays the role of physical filling, and the effect on strength and durability is not obvious; fly ash and mineral powder have volcanic ash activity. In addition, the micro morphology of fly ash is glass microsphere, which can be lubricated by ball effect and improve the working performance of cement concrete. Research shows powder coal. The amount of ash can not exceed 16%. At this time, the content of the corresponding mineral powder is 40%. The physical and durable properties of the cement are good and meet the national standard of the marine cement. The study on the composite admixtures of the sea workers and concrete shows that the mixture of metakaolin ground quartz sand drift beads and waste silica powder is made in accordance with the mass ratio of 1:1:2:2. As a concrete mineral admixture, the marine concrete prepared with this mineral admixture has good working performance, high compressive strength and low chloride diffusion coefficient and good durability, with Polycarboxylic Water reducing agent as chemical admixture and mineral admixture for use, the prepared Sea industrial concrete has good cohesiveness. Performance, water retention and working performance, high compressive strength, low chloride diffusivity and good durability.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV431;TV41
本文編號：2128950
[Abstract]:Since the advent of cement concrete materials, more and more scholars have studied its application technology in the.21 century, the century of ocean, marine resources are increasingly exploited by people, and the marine concrete structures also develop. Unlike the terrestrial environment, the marine environment contains a large number of harmful substances, which will be coagulated by coagulation. The soil protection layer reaches the steel bar, destroys the passivation film on the surface of the steel bar, reduces the bond strength between the reinforcement and the concrete, is not conducive to the long-term durability application of the marine structures, and it is very difficult or impossible to repair the marine structures once they are destroyed. The long-term durability of concrete structures is improved in view of the factors such as resources, economy and safety. The research on the durability of marine cement concrete is also very important. This paper uses fly ash, mineral powder and silica fume as a mixture, and research and Research on the physical properties, impermeability, sulfate corrosion resistance and chloride diffusion coefficient of cement mortar. A kind of marine cement with high durability is issued. Using metakaolin, fine quartz sand, waste silica powder and floating beads as mineral admixtures, and chemical admixtures (water reducing agent), the chemical additives - chemical additives - chemical additives - chemical addition - chemical additives - chemical additives (water reducing agents) are used to determine the mineral admixtures - chemical additives. The best proportion of additive (water reducing agent) and the suitable admixture of compound admixture. The main research work and results are as follows: chlorine ion is the main cause of corrosion of steel bar. Therefore, the content of chloride ion in the composition of concrete is strictly controlled. The fly ash, mineral powder, silica fume, and metakaolin, waste silica powder and fine quartz sand The chemical analysis of the components, such as the floating bead and other components, is made of raw materials with no chloride ions or less than 0.06% of the chlorine ion content. For the prepared marine Portland cement, gypsum has a good retarding and enhancement effect. Under the condition of CH, the micro expansion of AFt is generated by the hydration reaction consumption of CH, not only the strength of the cement can be increased, but also the strength of the cement can be improved. It can reduce the porosity, increase the density of the cement system and effectively prevent the harmful substances from the external environment into the cement concrete. The study shows that the best dosage of gypsum is 7%. When the amount of gypsum is too high, the expansion rate will be too large because of the excessive amount of AFt, which causes the micro cracks in the cement system, and the strength and durability of the cement system. On the one hand, silica fume is highly active superfine powder. On the one hand, it can participate in hydration reaction to produce cementitious material and improve the strength of cement system. On the other hand, it can give full play to its physical filling effect, reduce the porosity of cement system and increase the density. The best dosage of silica fume is 4%, and the reaction is when the amount of silica fume is too high. The required content of CH is insufficient, excessive silica fume mainly plays the role of physical filling, and the effect on strength and durability is not obvious; fly ash and mineral powder have volcanic ash activity. In addition, the micro morphology of fly ash is glass microsphere, which can be lubricated by ball effect and improve the working performance of cement concrete. Research shows powder coal. The amount of ash can not exceed 16%. At this time, the content of the corresponding mineral powder is 40%. The physical and durable properties of the cement are good and meet the national standard of the marine cement. The study on the composite admixtures of the sea workers and concrete shows that the mixture of metakaolin ground quartz sand drift beads and waste silica powder is made in accordance with the mass ratio of 1:1:2:2. As a concrete mineral admixture, the marine concrete prepared with this mineral admixture has good working performance, high compressive strength and low chloride diffusion coefficient and good durability, with Polycarboxylic Water reducing agent as chemical admixture and mineral admixture for use, the prepared Sea industrial concrete has good cohesiveness. Performance, water retention and working performance, high compressive strength, low chloride diffusivity and good durability.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV431;TV41
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 王利東;李珠;王文婧;李朋軒;;漂珠細(xì)度對保溫混凝土性能的影響[J];混凝土;2016年07期
2 孟慶舉;韓振國;張泗強(qiáng);;不同石膏作為水泥緩凝劑在水泥中的應(yīng)用[J];中國水泥;2016年05期
3 姜健;徐惠;唐軼繁;;礦物摻合料對再生混凝土抗氯離子滲透性研究[J];科技通報(bào);2016年02期
4 朱運(yùn)鋒;韋慶鳳;陳柳鋒;覃金鳳;江英;;不同摻合料對海工硅酸鹽水泥氯離子擴(kuò)散系數(shù)的影響[J];企業(yè)科技與發(fā)展;2016年02期
5 管娟;王坤芳;;海洋工程用水泥混凝土材料應(yīng)用現(xiàn)狀及發(fā)展對策[J];江蘇建材;2015年04期
6 徐國強(qiáng);于慶坤;楊小杰;劉曉偉;;海工混凝土鋼筋腐蝕及防護(hù)措施綜述[J];江西建材;2015年13期
7 王昕;劉晨;劉云;鄭旭;馬國寧;葉曉林;邵柏承;樓挺挺;;海工硅酸鹽水泥及其混凝土性能特點(diǎn)[J];水泥;2015年06期
8 袁銀峰;麻海燕;余紅發(fā);翁智財(cái);達(dá)波;肖衛(wèi);麻海艦;吳雅玲;;硅灰摻量對混凝土氯離子結(jié)合能力的影響[J];硅酸鹽通報(bào);2014年09期
9 應(yīng)悅;;海工水泥的特性和生產(chǎn)技術(shù)要求[J];水泥工程;2014年04期
10 艾紅梅;孔靖勛;盧洪正;朱蘇峰;;大摻量粉煤灰海工混凝土耐久性探討[J];建材技術(shù)與應(yīng)用;2014年02期
相關(guān)博士學(xué)位論文 前2條
1 屈鋒;鹽凍環(huán)境下混凝土構(gòu)件耐久性及壽命預(yù)測研究[D];西安建筑科技大學(xué);2014年
2 張志偉;原生型無水石膏在硅酸鹽水泥中的作用研究[D];重慶大學(xué);2012年
相關(guān)碩士學(xué)位論文 前4條
1 劉從燕;減水劑在商品混凝土中的應(yīng)用研究[D];南昌大學(xué);2014年
2 李麗;在役海港碼頭混凝土構(gòu)件安全耐久性評估模型研究[D];上海海事大學(xué);2006年
3 任七華;海洋環(huán)境下抗腐蝕材料開發(fā)與性能研究[D];浙江大學(xué);2006年
4 陳沖;聚羧酸系減水劑的研究[D];廣東工業(yè)大學(xué);2003年
，本文編號：2128950
本文鏈接：http://sikaile.net/kejilunwen/shuiwenshuili/2128950.html
最近更新
教材專著
