本文選題：超高性能水泥基復(fù)合材料 + 稻殼灰��； 參考：《東南大學(xué)》2015年碩士論文

【摘要】：生態(tài)型超高性能水泥基復(fù)合材料(ECO-UHPFRCC)采用礦物摻合料多元復(fù)合技術(shù),充分發(fā)揮優(yōu)勢(shì)互補(bǔ)效應(yīng),有效降低了UHPFRCC的成本。本文在前人研究的基礎(chǔ)上,研究采用稻殼灰替代硅灰以提高ECO-UHPFRCC性能的可行性。對(duì)制備得到的稻殼灰進(jìn)行活性測(cè)試,并系統(tǒng)分析了稻殼灰對(duì)水泥基材料的流動(dòng)性能、力學(xué)性能、微觀結(jié)構(gòu)以及水化的影響,揭示了稻殼灰對(duì)ECO-UHPFRCC性能影響的規(guī)律。對(duì)制備得到的稻殼灰性能測(cè)試,采用X射線衍射技術(shù)分析物相、掃面電鏡分析稻殼灰結(jié)構(gòu)、電導(dǎo)率以及熱分析測(cè)試稻殼灰的反應(yīng)活性。結(jié)果表明：稻殼灰650℃灼燒1h能夠得到主要成分為無(wú)定形Si02的灰分。稻殼灰為片狀、蜂窩狀多孔結(jié)構(gòu),層片結(jié)構(gòu)由幾十到幾百個(gè)納米的Si02顆粒堆積而成。稻殼灰活性的源于無(wú)定形Si02的灰分以及其內(nèi)部特有的多孔結(jié)構(gòu)。稻殼灰早期活性指數(shù)大于硅灰,隨著齡期延長(zhǎng)火山灰反應(yīng),稻殼灰和硅灰28d活性指數(shù)接近。對(duì)不同稻殼灰摻量的低水膠比漿體進(jìn)行流動(dòng)度試驗(yàn)和流變學(xué)分析。結(jié)果表明：稻殼灰摻入后低水膠比漿體粘度以及屈服應(yīng)力增加,而硅灰在不大于10%摻量能夠降低漿體粘度和屈服應(yīng)力；20%硅灰、稻殼灰復(fù)合摻量下,稻殼灰硅灰各10%摻量?jī)魸{屈服應(yīng)力以及粘度值最低,從優(yōu)勢(shì)互補(bǔ)的角度應(yīng)該選擇稻殼灰和硅灰復(fù)摻。20%硅灰、稻殼灰復(fù)合摻量下,砂漿流動(dòng)性隨著砂膠比增大而下降；鋼纖維摻量0%增加到2%,鋼纖維對(duì)流動(dòng)性的影響不大。當(dāng)鋼纖維摻量大于2.0%后,漿體流動(dòng)度快速下降,鋼纖維摻量基準(zhǔn)體積摻量定為2%。對(duì)硅灰和稻殼灰復(fù)摻摻量、鋼纖維體積率和砂膠比對(duì)UHPFRCC的抗折抗壓強(qiáng)度的影響進(jìn)行分析。綜合試驗(yàn)結(jié)果,在85℃蒸汽養(yǎng)護(hù)條件下制得的最高抗壓強(qiáng)度為199MPa,其配合比為0.165水膠比、30%摻量粉煤灰、10%摻量硅灰、10%稻殼灰、3%體積率鋼纖維、1.0砂膠比。稻殼灰部分替代硅灰能夠明顯提高超高性能水泥基復(fù)合材料抗壓強(qiáng)度。斷裂韌性試驗(yàn)表明：10%摻量稻殼灰和10%摻量硅灰復(fù)摻提高了水泥基材料的斷裂韌度、斷裂能；20%固定復(fù)摻量下,R10SF10體系具有最低屈服應(yīng)力和粘度值,屈服應(yīng)力小有利于纖維的良性能取向而提升試件彎折性能。纖維體積摻量1%增大到2%,基體的斷裂能增大超過(guò)100%,纖維體積摻量大于2%增強(qiáng)效應(yīng)不明顯。形貌以及孔結(jié)構(gòu)分析結(jié)果表明：UHPFRCC的基體與集料及基體與鋼纖維之間都沒(méi)有明顯界面過(guò)渡區(qū)；稻殼灰和硅灰復(fù)摻后,UHPFRCC小毛細(xì)孔減少、凝膠孔增多,超高性能水泥基材料基體有非常高的密實(shí)度。水泥水化熱實(shí)驗(yàn)和基于XRD定量分析結(jié)果表明稻殼灰能夠提高早期水泥水化程度,復(fù)摻稻殼灰、硅灰對(duì)水泥水化程度提高更明顯。
[Abstract]:Ecotypic ultra-high performance cement matrix composites (ECO-UHPFRCC) adopt mineral admixture multicomponent composite technology to give full play to the advantage complementary effect and effectively reduce the cost of UHPFRCC. On the basis of previous studies, the feasibility of using rice husk fume instead of silica fume to improve the performance of ECO-UHPFRCC was studied. The effects of rice husk ash on the fluidity, mechanical properties, microstructure and hydration of cement-based materials were systematically analyzed, and the effects of rice husk ash on ECO-UHPFRCC properties were revealed. The phase of rice husk ash was analyzed by X-ray diffraction technique. The structure, conductivity and reaction activity of rice husk ash were analyzed by scanning electron microscope (SEM). The results showed that the main component of rice husk ash was amorphous Si02 when it was burnt at 650 鈩，

本文編號(hào)：2118524