本文關(guān)鍵詞： BaO 磷鋁酸鈣 鋁酸鈣 高鐵磷鋁酸鹽水泥 含鋇磷鋁酸鹽水泥　出處：《濟(jì)南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文主要研究了BaO對(duì)磷鋁酸鹽水泥合成及性能的影響,通過(guò)摻雜Ba2+離子部分取代Ca2+離子,增加磷鋁酸鹽水泥礦相微結(jié)構(gòu)缺陷,優(yōu)化熟料礦物組成,提高其水化活性,以期制備出具有良好力學(xué)性能的含鋇磷鋁酸鹽水泥熟料。主要從以下幾個(gè)方面開(kāi)展研究:將BaO引入到磷鋁酸鈣和鋁酸鈣礦物中,使其晶格產(chǎn)生畸變,調(diào)節(jié)礦物微結(jié)構(gòu),進(jìn)一步提高礦物的水化活性;制備高鐵磷鋁酸鹽水泥熟料,研究氧化鐵對(duì)磷鋁酸鹽水泥熟料礦相低溫形成的影響規(guī)律;以單礦物中BaO的摻量研究為基礎(chǔ),將BaO引入高鐵磷鋁酸鹽水泥熟料,獲得具有良好性能的含鋇磷鋁酸鹽水泥熟料。主要研究結(jié)論如下:(1)摻入適量的BaO,磷鋁酸鈣礦物的各齡期抗壓強(qiáng)度均有所提高。其最佳摻量為20%(摩爾摻量,BaO取代Ca O量)。在最佳摻量條件下,該礦物3d、28d、90d抗壓強(qiáng)度分別達(dá)到了60.0MPa,109.3MPa和122.7MPa。分別比空白樣提高了38.5%,26.0%和18.2%。(2)BaO的摻入使得磷鋁酸鈣礦物水化明顯加快,7d的水化程度達(dá)到90%以上,且更容易生成穩(wěn)定的水化產(chǎn)物C(A,P)H10;磷鋁酸鈣的水化產(chǎn)物的形態(tài)由板狀轉(zhuǎn)變?yōu)楸∑瑺?且水化產(chǎn)物尺寸更小,大約在2μm~5μm,這使得礦物水化產(chǎn)物相互搭接更為緊密,形成更密實(shí)的硬化漿體結(jié)構(gòu);孔結(jié)構(gòu)分析結(jié)果表明,含鋇磷鋁酸鈣礦物的硬化漿體有害孔含量與空白樣相比大大降低。(3)摻加BaO可增加CA合成過(guò)程中的液相量,減少中間產(chǎn)物C12A7的量;當(dāng)BaO摻量為7%(摩爾摻量,Ba O取代CaO量)時(shí),試樣具有較好的抗壓強(qiáng)度;Ba2+離子的引入可穩(wěn)定CAH10晶格,阻止CAH10向C3AH6的晶型轉(zhuǎn)變,防止后期強(qiáng)度倒縮;隨著B(niǎo)a2+離子摻量的增加,水化產(chǎn)物CAH10最大分解速率溫度逐漸增加,水化產(chǎn)物熱穩(wěn)定性提高;CA結(jié)構(gòu)中BaO的最大容納量為15%,超出該摻量后將出現(xiàn)氣硬性礦物BA的衍射峰。(4)高鐵磷鋁酸鹽水泥熟料中Fe2O3最佳含量為11%(質(zhì)量分?jǐn)?shù)),當(dāng)煅燒溫度為1350℃。該試樣1d強(qiáng)度可達(dá)70.6MPa,28d強(qiáng)度達(dá)到95.5MPa;相應(yīng)的熟料氧化物質(zhì)量組成范圍為Al2O3 25.0~32.0%,CaO 30.0~40.0%,P2O5 14.0~15.0%,SiO23.0~5.0%,Fe2O3 10.5~11.0%。Fe2O3可以作為磷鋁酸鹽水泥燒成過(guò)程中的一個(gè)重要組分,在較低的溫度下促進(jìn)礦物CA1-Y(PY)向特征礦物L(fēng)Hss的轉(zhuǎn)變,調(diào)整高鐵磷鋁酸鹽水泥礦物組成;鐵相處在主要熟料礦物的間隙中,是一系列固溶體,沒(méi)有固定的化學(xué)組成。(5)含鋇高鐵磷鋁酸鹽水泥熟料中BaO最佳摻量為11%(摩爾摻量,BaO取代CaO量),Fe2O3最低摻量為7%(質(zhì)量分?jǐn)?shù)),最佳煅燒溫度為1420℃,相應(yīng)的熟料氧化物質(zhì)量組成范圍為Al2O3 25.0~32.0%,CaO 30.0~37.0%,BaO 10.5~11.0%,P2O514.0~15.0%,SiO2 3.0~5.0%,Fe2O3 6.0~7.5%。其1d強(qiáng)度為106.5MPa,28d強(qiáng)度達(dá)到了143.2MPa;與高鐵磷鋁酸鹽水泥相比,其1d、3d、7d和28d強(qiáng)度分別增長(zhǎng)了50.8%、21.0%、27.0%和49.9%。
[Abstract]:In this paper, the effect of BaO on the synthesis and properties of phosphoaluminate cement was studied. By partially replacing the Ca2 ion with Ba2 ion, the microstructural defects of Phosphoaluminate cement were increased, the mineral composition of clinker was optimized and its hydration activity was improved. In order to prepare barium phosphoaluminate cement clinker with good mechanical properties, the following aspects were studied: introducing BaO into calcium aluminate phosphate and calcium aluminate minerals, resulting in lattice distortion and adjusting mineral microstructure, To further improve the hydration activity of minerals, to prepare ferric aluminate cement clinker, to study the influence of ferric oxide on the formation of mineral phase at low temperature, based on the study of the content of BaO in single mineral, BaO was introduced into high iron phosphoaluminate cement clinker, Barium phosphate aluminate cement clinker with good properties has been obtained. The main conclusions are as follows: 1: 1) the compressive strength of calcium aluminophosphate minerals at all ages has been improved with the addition of appropriate amount of Bao. The optimum addition amount is 20% (mol amount of Bao instead of Ca). Under the optimum dosage condition, The compressive strength of the mineral reached 60.0 MPA 109.3 MPA and 122.7 MPA, respectively. The addition of 38.5% and 18.20.2mBaO increased the hydration of calcium aluminophosphate to more than 90%, respectively, compared with the blank sample, and the compressive strength of the mineral reached 60.0MPA 109.3 MPA and 122.7 MPa respectively, which increased the hydration of calcium aluminophosphate by 38.5% and 18.2% respectively, and increased the hydration degree of calcium aluminophosphate to more than 90% in 7 days. It is easier to form a stable hydration product, CnAH10, and the form of hydration product of calcium aluminate aluminophosphate changes from plate to sheet, and the size of hydration product is smaller, which is about 2 渭 m ~ 5 渭 m, which makes the mineral hydration products overlap more closely with each other. The results of pore structure analysis showed that the harmful pore content of hardened paste containing barium phosphate calcium aluminate mineral was much lower than that of blank sample. Addition of BaO could increase the amount of liquid phase in the process of CA synthesis. When the content of the intermediate product C _ (12) A _ 7 is reduced, when the content of BaO is 7% (CaO is replaced by Ba _ (O)), the CAH10 lattice can be stabilized by the introduction of Ba _ (2) ion, which can prevent the transition of CAH10 to the crystal form of C _ (3AH _ 6) and prevent the later strength from collapsing. With the increase of Ba2 ion content, the maximum decomposition rate temperature of hydration product CAH10 increases gradually. The thermal stability of hydration products improves the maximum holding capacity of BaO in CA structure is 15. The diffraction peak of gas-hard mineral BA will appear when the content exceeds this amount.) the optimum content of Fe2O3 in high iron phosphoric aluminate cement clinker is 11 (mass fraction, when calcined temperature is high). The strength of the sample can reach 70.6 MPA / 28d in 1 day at 1350 鈩，

本文編號(hào)：1523976