發(fā)布時間：2018-05-23 20:37

  本文選題：微量組分 + 貝利特-硫鋁酸鋇鈣水泥�。� 參考：《濟南大學》2014年碩士論文

【摘要】：傳統(tǒng)硅酸鹽水泥具有能耗高、消耗優(yōu)質(zhì)石灰石資源、CO2排放量大等缺點，而且其體積穩(wěn)定性和耐久性還需進一步提高。貝利特-硫鋁酸鋇鈣水泥（BSAC）是環(huán)境友好、長期力學性優(yōu)異的水泥體系之一，但是該水泥早期力學性能尚不足，本文旨在引入微量組分和改善煅燒制度，調(diào)節(jié)熟料中的硅酸鹽相—貝利特和阿利特的微結(jié)構(gòu)，通過穩(wěn)定其高溫高活性晶型或使晶格產(chǎn)生畸變，進一步提高硅酸鹽相的反應活性，以達到提高水泥早期強度的目的。主要研究結(jié)論如下： （1）對于C2S單礦體系，在微量組分作用下C2S晶型主要為β-C2S與γ-C2S，穩(wěn)定β-C2S的大小順序為：SO3SrONa2OK2OBaO無摻試樣MgO；BaO對穩(wěn)定αL’-C2S有一定作用，而Na2O與K2O穩(wěn)定作用較弱；復合摻雜能夠進一步降低試樣粉化率并穩(wěn)定C2S高溫晶型；對于C3S單礦體系，在微量組分作用下C3S晶型主要為T型和M型，其中MgO對穩(wěn)定M3-C3S作用明顯，甚至可以穩(wěn)定R型C3S；摻雜1.5%-3%BaO對穩(wěn)定M型C3S有明顯作用；K2O存在時，C3S主要晶型為T型；摻雜0.5%-1.5%Na2O可以使C3S穩(wěn)定為M型；摻雜1%SrO可以使C3S由T型向M型轉(zhuǎn)變；在中間相和微量組分協(xié)同作用的熟料中，貝利特主要為α-C2S，當C3A/C4AF=2:5時，阿利特晶型為水化活性較高的M1型。 （2）SrO在BSAC熟料中的適宜摻量為3%-5%，其1d，3d，7d，28d凈漿抗壓強度分別達到8.4MPa、35.8MPa、71.3MPa及103.7MPa；摻入1%MgO時水泥早期力學性能較高，其1d，3d，7d及28d抗壓強度分別為14.7MPa、23.9MPa、34.4MPa和75.5MPa；該水泥熟料體系可容納更多MgO，當熟料中摻有7%MgO時水泥安定性仍然良好，其1d，3d，7d及28d抗壓強度分別為33.6MPa、59.7MPa、89.1MPa及95.1MPa；當K2O摻量為2%時水泥1d，3d，7d及28d抗壓強度可達14.9MPa、48.6MPa、75.7MPa及106.5MPa。Na2O摻量為0.5%時，，水泥達到抗壓強度最高，其1d，3d，7d及28d抗壓強度分別為13.9MPa、40.7MPa、76.6MPa及108.9MPa。 （3）摻雜SrO，MgO，Na2O及K2O后，熟料中貝利特主要以α’-C2S存在；摻雜SrO后C3S主要以M3型存在，同時含有少量的M1及M2型；對于摻有MgO的熟料， C3S表現(xiàn)為M1型與M3型共存的特征，無M2型C3S；通過水化放熱曲線可以看出，熟料3d水化速率順序為：摻雜5%SrO摻雜7%MgO1%MgO無摻試樣和0.5%Na2O2%K2O無摻試樣。摻雜5%SrO試樣的3d最大水化速率點是摻雜1%MgO和無摻試樣的2.5倍。對Na2O和K2O而言，呈現(xiàn)出以下順序：0.5%Na2O2%K2O無摻試樣。 （4）通過研究煅燒制度對水泥熟料微結(jié)構(gòu)和力學性能的影響，得到摻雜2%K2O的水泥硬化漿體7d和14d抗壓強度在快速煅燒條件下（從室溫以30℃/min的升溫速率升至510℃；從510℃至810℃以20℃/min速率升溫；810-1380℃以10℃/min升溫）比普通煅燒制度（5℃/min的升溫速率升至1380℃）下均高出10MPa左右的結(jié)論，歸因于此時硅酸鹽相的生成量增加，此時阿利特主要為M1型，貝利特為α-C2S和少量β-C2S；相比快速煅燒制度，液氮冷卻工藝對硅酸鹽相形成和穩(wěn)定高溫晶型并無顯著影響。
[Abstract]:Traditional Portland cement has the disadvantages of high energy consumption and high CO2 emission from high quality limestone resources, and its volume stability and durability need to be further improved. BSAC) is one of the environmentally friendly cement systems with excellent long-term mechanical properties, but its early mechanical properties are still insufficient. The purpose of this paper is to introduce trace components and improve the calcination system. By adjusting the microstructure of silicate phase -belit and alite in clinker, the reaction activity of silicate phase can be further improved by stabilizing its high-temperature and high-activity crystal form or distorting the lattice, so as to improve the early strength of cement. The main findings are as follows: For the single ore system of C _ 2S, the main crystal forms of C _ 2S are 尾 -C2S and 緯 -C2S under the action of trace components, and the order of stabilizing 尾 -C2S is: the size of 尾 -C2S is in the order of 尾 -SO3SrONa2OK2OBaO, which has a certain effect on the stabilization of 偽 L'-C2S, but the stabilization effect of Na2O and K2O is weak; The composite doping can further reduce the pulverization rate of the sample and stabilize the high temperature crystal form of C _ 2S. For the single ore system of C _ 3s, the crystal forms of C _ 3s are mainly T type and M type under the action of trace components, in which MgO plays an important role in stabilizing M3-C3S. It can even stabilize R-type C3S, doping 1.5-3O has obvious effect on stabilizing M-type C3S, doping 0.5%-1.5%Na2O can make C3S stable to M-type, doping 1%SrO can make C3S change from T-type to M-type, and the main crystal form of C3S is T type in the presence of K2O, and doping 1%SrO can make C3S change from T-type to M-type. In the clinker with synergistic effect of mesophase and trace components, Berlitt is mainly 偽 -C2S.The Allitt crystal form is M1 type with higher hydration activity when C3A/C4AF=2:5 is used. The suitable amount of BSAC clinker is 3- 5, and the compressive strength of clean slurry is up to 8.4 MPA and 103.7 MPA, respectively, and the mechanical properties of cement at early stage are higher when 1%MgO is added, and the compressive strength of clean slurry reaches 8.4MPA ~ 35.8 MPA and 103.7MPa respectively at 1 d ~ 3 d ~ 7 d ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The compressive strength of the cement clinker system is 14.7 MPA and 75.5 MPA respectively, and the cement clinker system can hold more MgO, and the cement stability is still good when 7%MgO is added into the clinker. The compressive strength of the cement is 33.6 MPA (33.6 MPA) and 59.7 MPA (89.1MPa) and 95.1 MPa (28d) respectively, and the compressive strength of cement (48.6MPa 75.7 MPA) and 106.5MPa.Na2O (28d) is up to 14.9 MPA and 28d when the K2O content is 2, and the compressive strength of cement is 13.9 MPA and 108.9MPa, respectively, when the content of K2O is 2, the compressive strength of the cement is 39.6 MPA and 95.1 MPa respectively, and the compressive strength of the cement is 48.6MPa and 108.9MPa respectively when the content of K2O is 2, and the compressive strength of the cement is 48.6MPa and 108.9MPa respectively, when the content of K2O is 2, the compressive strength of the cement is 39.6 MPA and 28d respectively. (3) after doped with SrOO, MgO, Na 2O and K 2O, Berlitt in clinker mainly exists as 偽 -C _ 2S, C _ 3s mainly exists as M _ 3 type after doping SrO, and there is a little M _ 1 and M _ 2 type, for clinker with MgO, C _ 3s is characterized by coexistence of M _ 1 type and M _ 3 type, and C _ 3s is characterized by coexistence of M _ 1 type and M _ 3 type in clinker. From the hydration exothermic curves, it can be seen that the order of hydration rate of clinker is as follows: doped 5%SrO doped 7%MgO1%MgO without doping and 0.5%Na2O2%K2O without doping. The maximum hydration rate of doped 5%SrO samples is 2.5 times of that of doped 1%MgO and undoped samples. For Na2O and K _ 2O, the following order is presented: 0.5 and Na _ 2O _ 2K _ 2O _ free samples. 4) by studying the effect of calcination system on the microstructure and mechanical properties of cement clinker, the compressive strength of cement hardened paste doped with 2%K2O was obtained under the condition of fast calcination (from room temperature to 510 鈩

本文編號：1926257