本文關(guān)鍵詞： 鈦礦渣 堿激發(fā) 免燒陶粒 輕集料混凝土　出處：《西南科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：我國攀西地區(qū)高鈦型高爐礦渣排放量和堆存量巨大,但其Ti O2及相應(yīng)的低活性晶體礦物含量高,導(dǎo)致水化活性偏低,直接用于水泥生產(chǎn)或混凝土制備將影響產(chǎn)品的力學(xué)性能。本文提出以高鈦礦渣為主要原料,采用堿激發(fā)技術(shù)制備堿激發(fā)鈦礦渣(AATS)和鈦礦渣免燒輕質(zhì)陶粒。研究了激發(fā)劑、水膠比、養(yǎng)護(hù)溫度以及養(yǎng)護(hù)時間對AATS膠凝基體性能影響;選擇合適配比的AATS膠凝基體粘結(jié)劑,以雙氧水和鋁粉為室溫引氣劑,通過圓盤造粒,制備了堿激發(fā)鈦礦渣免燒輕質(zhì)陶粒(SLWA);最后以SLWA為輕集料,制備了輕集料混凝土,并研究了相關(guān)性能。研究結(jié)果表明:水玻璃作為激發(fā)劑對鈦礦渣激發(fā)效果良好,室溫條件下,水玻璃摻量越大,水膠比越低,堿激發(fā)鈦礦渣膠凝基體強(qiáng)度越高;90℃蒸汽養(yǎng)護(hù)12h可進(jìn)一步提高堿激發(fā)鈦礦渣膠凝基體強(qiáng)度。以鋁粉和雙氧水為引氣劑,采用圓盤造粒,可制得700、800和900密度等級的陶粒。鋁粉引氣工藝簡單,容易操作,制得陶粒堆積密度小,但內(nèi)部通孔結(jié)構(gòu)較多、吸水率大;雙氧水引氣易受環(huán)境條件影響,引氣過程對工藝和操作要求更高,但制得的陶粒表面更光滑致密、內(nèi)部孔結(jié)構(gòu)均勻、通孔結(jié)構(gòu)少、吸水率低,各項性能優(yōu)于鋁粉引氣制備的陶粒。鋁粉和雙氧水復(fù)合引氣,工藝與鋁粉引氣工藝相似,容易操作,制得的陶粒各項性能都優(yōu)于兩者單獨引氣制備的陶粒。選擇筒壓強(qiáng)度較高的800密度等級陶粒為輕集料,分別配制出容重1700 kg/m3、1800kg/m3的輕集料混凝土,發(fā)現(xiàn)輕集料混凝土界面過渡區(qū)與普通骨料混凝土界面過渡區(qū)存在一定差異。
[Abstract]:In Panxi area of China, the slag discharge and heap stock of high titanium blast furnace are huge, but the content of TIO 2 and the corresponding low active crystal minerals are high, which results in low hydration activity. Direct use in cement production or concrete preparation will affect the mechanical properties of the product. In this paper, the alkali activated titanium slag (AATS) and the titanium slag without burning light ceramic particles are prepared by alkali excitation technique using high titanium slag as the main raw material. The effects of water / binder ratio, curing temperature and curing time on the properties of AATS cementing matrix were studied, and the suitable binder of AATS cementing matrix was selected, and hydrogen peroxide and aluminum powder were used as room temperature entrainer, and then granulated on disk, Light-weight aggregate concrete was prepared with SLWA as light aggregate and alkali activated titanium slag was prepared. The results show that sodium silicate as activator can excite titanium slag well at room temperature. The higher the water glass content, the lower the water-binder ratio, the higher the strength of alkali stimulated titanium slag cementitious matrix is, the higher the strength of cementing matrix is when steam curing at 90 鈩，

本文編號：1524113