【摘要】：圍繞工業(yè)廢棄鋼渣再生利用、高性能地聚合物偏高嶺土在改性土中應(yīng)用以及水泥改性土性能提升這3個(gè)問題,設(shè)計(jì)了摻入鋼渣與偏高嶺土后水泥改性土的一系列室內(nèi)試驗(yàn),從擊實(shí)特性、抗壓強(qiáng)度以及劈裂抗拉強(qiáng)度3個(gè)方面闡述改性土的宏觀性能;同時(shí)開展了SEM,XRD,TGA與MIP等微觀試驗(yàn),明晰水化產(chǎn)物生成以及微觀結(jié)構(gòu)與孔隙分布的內(nèi)在機(jī)制,進(jìn)而為廢棄物再生利用與改性土性能提升奠定理論基礎(chǔ)。宏觀試驗(yàn)結(jié)果表明:鋼渣對水泥改性土擊實(shí)特性和力學(xué)強(qiáng)度有所改善;引入偏高嶺土后,上述性能得到明顯改良和提升,改良后力學(xué)強(qiáng)度與偏高嶺土摻量之間呈現(xiàn)先增加后減小的規(guī)律,最優(yōu)摻入比(偏高嶺土與水泥質(zhì)量比值)為1/3~1/2;劈裂抗拉強(qiáng)度與無側(cè)限抗壓強(qiáng)度之間成正比關(guān)系,斜率比值為0.83。微觀試驗(yàn)結(jié)果表明:鋼渣和偏高嶺土摻入后,不能改變水泥改性土中水化產(chǎn)物的類型,但改變了水化產(chǎn)物的包裹形式和數(shù)量,使得試樣的微觀結(jié)構(gòu)和孔徑分布發(fā)生改變,這是2種材料提升水泥改性土宏觀力學(xué)強(qiáng)度,但改良效果有明顯區(qū)別的內(nèi)在原因。
[Abstract]:A series of laboratory tests of cement modified soil with steel slag and metakaolin were designed based on three problems: recycling of industrial waste steel slag, application of high performance geopolymer metakaolin in modified soil and improvement of performance of cement modified soil. The macroscopical performance of modified soil is expounded from three aspects: compaction property, compressive strength and splitting tensile strength. At the same time, microcosmic tests such as SEM,XRD,TGA and MIP were carried out to clarify the internal mechanism of the formation of hydration products and the microstructure and pore distribution, thus laying a theoretical foundation for waste recycling and improvement of the properties of modified soil. The macro-test results show that the compaction characteristics and mechanical strength of cement-modified soil are improved by steel slag. After the addition of metakaolin, the above-mentioned properties were obviously improved and improved, and the relationship between the mechanical strength and the content of metakaolin was first increased and then decreased, and the optimum mixing ratio (mass ratio of metakaolin to cement) was 1 ~ 3 ~ 1 ~ 2; The splitting tensile strength is proportional to the unconfined compressive strength, and the slope ratio is 0.83. The results of microcosmic test showed that the type of hydration products in cement modified soil could not be changed by mixing steel slag and metakaolin, but the form and quantity of hydration products were changed, and the microstructure and pore size distribution of samples were changed. This is the internal reason why the two kinds of materials enhance the macro-mechanical strength of cement-modified soil, but the improvement effect is obviously different.
【作者單位】： 東南大學(xué)交通學(xué)院;連云港港口集團(tuán);連云港贛榆港區(qū)建設(shè)現(xiàn)場指揮部;合肥工業(yè)大學(xué)資源與環(huán)境工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41572280,41372281) 江蘇省六大人才高峰項(xiàng)目(2014-XCL-003) 東南大學(xué)優(yōu)秀博士學(xué)位論文基金項(xiàng)目(YBJJ1634) 江蘇省普通高校學(xué)術(shù)學(xué)位研究生創(chuàng)新計(jì)劃項(xiàng)目(KYLX16-0240)
【分類號】：U414

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1 雷小文;何曉鳴;;偏高嶺土混凝土性能試驗(yàn)分析及應(yīng)用[A];湖北省公路學(xué)會二○○九年學(xué)術(shù)年會論文集[C];2010年

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