本文關(guān)鍵詞：粉煤灰—礦渣復(fù)合基礦物聚合物的制備及性能研究　出處：《西安建筑科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 礦渣 粉煤灰 堿硅酸鹽 礦物聚合物 抗壓強(qiáng)

【摘要】：近年來,礦物聚合物作為一種新開發(fā)的綠色膠凝材料,與硅酸鹽水泥相比,礦物聚合物具有生產(chǎn)能耗低、環(huán)境友好、強(qiáng)度發(fā)展快、耐久性和熱穩(wěn)定好等優(yōu)勢(shì),因此具有廣闊的發(fā)展前景。本試驗(yàn)以粉煤灰和礦渣組成二元膠凝體系,在堿硅酸鹽激發(fā)劑作用下,制備得到了粉煤灰-礦渣復(fù)合基礦物聚合物材料。以礦物聚合物硬化體的抗壓強(qiáng)度作為性能指標(biāo),研究了粉煤灰與礦渣的復(fù)合比例、堿硅酸鹽激發(fā)劑的模數(shù)與固含量、粉煤灰中CaO的含量、形態(tài)以及液膠比等對(duì)礦物聚合物性能的影響規(guī)律,并結(jié)合X射線衍射(XRD)、掃描電鏡(SEM)、紅外光譜(FT-IR)及核磁共振(NMR)等測(cè)試手段,對(duì)原材料的微觀形貌、化學(xué)組成、堿硅酸鹽激發(fā)劑溶液的結(jié)構(gòu)及礦物聚合物硬化體在固化過程中的反應(yīng)機(jī)理進(jìn)行分析。同時(shí),對(duì)礦物聚合物的耐久性(包括耐高溫性能及抗碳化性能)和纖維強(qiáng)化增韌礦物聚合物的性能進(jìn)行了試驗(yàn)分析。試驗(yàn)結(jié)果表明:隨著粉煤灰占總膠凝材料比例的增加,硬化體的抗壓強(qiáng)度逐漸降低;當(dāng)堿硅酸鹽激發(fā)劑固含量為32%時(shí),礦物聚合物的抗壓強(qiáng)度隨其模數(shù)的增大先增大后減小;當(dāng)激發(fā)劑模數(shù)為1.2時(shí),其28 d的抗壓強(qiáng)度高達(dá)102MPa;礦物聚合物的抗壓強(qiáng)度隨液膠比的增大先增大后減小,當(dāng)液膠比為0.48時(shí),其抗壓強(qiáng)度達(dá)到最大;當(dāng)粉煤灰中CaO為非晶態(tài)時(shí),CaO含量越高,礦物聚合物的抗壓強(qiáng)度越大;粉煤灰中CaO為晶體狀態(tài)時(shí),f-CaO在反應(yīng)過程中形成氫氧化鈣導(dǎo)致礦物聚合物后期強(qiáng)度倒縮。抗碳化試驗(yàn)結(jié)果表明:碳化早期,礦物聚合物碳化程度大于普通硅酸鹽水泥,隨著碳化齡期的延長(zhǎng),礦物聚合物GFAN、GFAX與普通硅酸鹽水泥的碳化趨勢(shì)逐漸緩和,與硅酸鹽水泥相比,后期礦物聚合物的抗碳化性能較差。耐高溫試驗(yàn)結(jié)果表明:常溫下,礦物聚合物的抗壓強(qiáng)度要比普通硅酸鹽水泥高,經(jīng)高溫處理后,礦物聚合物的耐高溫性能優(yōu)于普通硅酸水泥。在400℃~1000℃高溫煅燒過程中,隨煅燒溫度的升高,其抗壓強(qiáng)度均有所降低,當(dāng)溫度達(dá)到1000℃時(shí),礦物聚合物仍留了原始強(qiáng)度的50.1%,并且表面未出現(xiàn)裂紋、疏松等現(xiàn)象。相反,普通硅酸鹽水泥的抗壓強(qiáng)度幾乎喪失,試件嚴(yán)重遭到破壞,表面疏松,裂縫顯著變寬。試驗(yàn)進(jìn)一步探討了碳纖維與玄武巖纖維對(duì)粉煤灰-礦渣復(fù)合基礦物聚合物的增韌效果,發(fā)現(xiàn)碳纖維與玄武巖纖維均能使粉煤灰-礦渣復(fù)合基礦物聚合物力學(xué)強(qiáng)度有不同程度的提高,其中抗折強(qiáng)度和抗拉強(qiáng)度增長(zhǎng)最為明顯,結(jié)合試驗(yàn)發(fā)現(xiàn)碳纖維增韌效果更佳。當(dāng)摻入0.5%碳纖維,其7d抗折強(qiáng)度和抗拉強(qiáng)度較不摻纖維分別提高了27.3%和62.1%。
[Abstract]:In recent years, mineral polymer is a newly developed green cementitious material. Compared with Portland cement, mineral polymer has advantages of low energy consumption, environmental friendliness, fast strength development, durability and good thermal stability, so it has broad prospects for development. A two component cementitious system consisting of fly ash and slag was prepared. The fly ash slag composite based mineral polymer material was prepared under the action of alkali silicate activator. The compressive strength of geopolymer hardened as the performance index of fly ash and slag composite ratio, alkali silicate activator modulus and solid content, ash content, morphology and CaO gel ratio on mineral polymer properties, combined with X ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) measurements of microstructure, chemical raw materials, composition, structure and mineral polymer hardened alkali silicate activator solution in the process of curing reaction mechanism analysis. At the same time, the durability of mineral polymers, including high temperature resistance and carbonization resistance, and the properties of reinforced toughened mineral polymers were tested. The test results show that with the increase of fly ash for total cementitious material ratio, compressive strength of hardened body gradually decreased; when the alkali silicate activator when solid content is 32%, the compressive strength increases with the increase of modulus of mineral polymer increased first and then decreased; when the activator modulus is 1.2, the 28 d compressive strength of up to 102MPa the compressive strength of geopolymer; with the increase of liquid binder ratio increases first and then decreases, when water binder ratio is 0.48, the compressive strength reached the maximum; when the fly ash CaO is amorphous, the content of CaO is higher, the greater the compressive strength of geopolymer; fly ash in CaO crystal state, f-CaO the formation of calcium hydroxide resulted in late strength mineral polymer contraction in the reaction process. The test results show that carbonation carbonation early, mineral polymer carbonization degree greater than ordinary portland cement, with the prolonging of carbonation time, carbonization trend of polymer GFAN, GFAX and mineral of Portland cement gradually ease, compared with Portland cement, mineral carbonation resistance of late poly poor complexes. The results of high temperature test indicate that the compressive strength of mineral polymer is higher than that of ordinary portland cement at room temperature. After high temperature treatment, the high temperature resistance of mineral polymer is better than that of ordinary silicate cement. During the calcination at 400 ~1000, the compressive strength decreased with the increase of calcination temperature. When the temperature reached 1000 degrees, the mineral polymer remained at 50.1% of original strength, and there was no crack and porosity on the surface. On the contrary, the compressive strength of the ordinary portland cement is almost lost, the specimen is seriously damaged, the surface is loose, and the crack widens remarkably. Experiment to further explore the toughening effect of carbon fiber and basalt fiber on ash slag based geopolymer composite, carbon fiber and basalt fiber can make the ash slag based geopolymer composite mechanical strength have different degrees of increase, the bending strength and tensile strength increase, combined with the test found that better toughening the effect of carbon fiber. When 0.5% carbon fibers were added, the flexural strength and tensile strength of 7D were increased by 27.3% and 62.1%, respectively, compared with those without fiber.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TQ177
，

本文編號(hào)：1346235