本文關(guān)鍵詞：礦渣—粉煤灰—水泥復(fù)合材料的鈣溶蝕過(guò)程研究　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鈣溶蝕 礦物摻和料 鈣離子濃度 孔隙率 鈣硅比 微觀結(jié)構(gòu) XRD 模型

【摘要】：長(zhǎng)期處于各種河流、湖泊及海洋等復(fù)雜水環(huán)境下的混凝土等水泥基材料,易于遭受環(huán)境水侵蝕而發(fā)生混凝土耐久性退化和結(jié)構(gòu)服役壽命降低等問(wèn)題。為了揭示水環(huán)境下水泥基材料因鈣溶蝕引起的耐久性退化問(wèn)題,本文設(shè)計(jì)去離子水以及6M氯化銨溶液兩種條件下?lián)接械V物摻和料的復(fù)合水泥硬化漿體的鈣溶蝕實(shí)驗(yàn),通過(guò)實(shí)驗(yàn)的測(cè)試以及利用模型進(jìn)行數(shù)值模擬,研究了不同礦物摻和料對(duì)水泥硬化漿體的溶蝕性能的影響。主要的研究成果與結(jié)論如下:(1)通過(guò)設(shè)計(jì)去離子水腐蝕環(huán)境下,開(kāi)展不同礦物摻和料對(duì)水泥基材料抗溶蝕性能的研究,并采用EDTA測(cè)定鈣離子濃度法、飽水-干燥稱重法、掃描電鏡(SEM)和EDS等測(cè)試方法對(duì)摻有不同礦物摻和料的復(fù)合漿體在溶蝕過(guò)程中的鈣離子溶出量、孔隙率、微觀形貌以及鈣硅比進(jìn)行了測(cè)定,獲得了軟水腐蝕條件下不同礦物摻和料對(duì)水泥基材料溶蝕性能的影響規(guī)律。測(cè)試結(jié)果表明,粉煤灰和礦渣的摻入在一定程度上都能改善水泥漿體的抗溶蝕性能,但摻有礦渣的復(fù)合漿體抗溶蝕性能更好。(2)開(kāi)展了 6M氯化銨加速溶蝕條件下粉煤灰-水泥復(fù)合漿體以及不同礦渣摻量的20%粉煤灰-水泥復(fù)合漿體圓柱試件的鈣溶蝕實(shí)驗(yàn)研究,通過(guò)對(duì)復(fù)合漿體的溶蝕深度、孔隙率、鈣硅比、微觀結(jié)構(gòu)以及XRD等進(jìn)行試驗(yàn)測(cè)試,結(jié)果表明,粉煤灰-水泥復(fù)合漿體中摻入礦渣后,復(fù)合漿體的溶蝕性能得到明顯提高。(3)建立了軟水溶蝕條件下水泥基材料的鈣溶蝕一維擴(kuò)散模型,并考慮礦物摻和料對(duì)水泥基材料初始參數(shù)的影響,通過(guò)調(diào)整鈣溶蝕模型的參數(shù)模擬了去離子水腐蝕條件下的薄片試件以及6M氯化銨腐蝕條件下的圓柱試件的鈣溶蝕進(jìn)程,將模型模擬計(jì)算結(jié)果與試驗(yàn)測(cè)試值進(jìn)行對(duì)比分析,結(jié)果表明,兩種腐蝕環(huán)境下試件的測(cè)試結(jié)果與模型模擬計(jì)算結(jié)果均具有較好的一致性,因此,該模型可對(duì)軟水腐蝕條件下的水泥材料的鈣溶蝕規(guī)律進(jìn)行預(yù)測(cè)。
[Abstract]:In the long river, concrete and other cement-based materials in complex water environment of lakes and oceans under, prone to water erosion and the durability of concrete structure degradation and service life reduction. In order to reveal the cement-based materials under water environment caused by calcium dissolution durability degradation, dissolution of calcium doped composite cement the hardened paste of mineral admixture of the design of deionized water and 6M ammonium chloride solution under two conditions, through the experimental test and numerical simulation using the model, the influence of different mineral admixtures on the erosion resistance of the hardened cement paste was studied. The research results and conclusions of the thesis are as follows: (1) through the design of DI water corrosive environment, carry out different mineral admixtures on anti corrosion properties of cement based materials, and calcium concentration was determined by using the method of EDTA water saturated dry weighing method, Saul Scanning electron microscopy (SEM) and EDS test method with the amount of calcium ion solution composite slurry of different mineral admixtures in the process of dissolution of mixed porosity ratio were measured and microstructure of calcium silicon, the soft water under the condition of corrosion of different mineral admixture of cement based material dissolution properties. The test results show that the fly ash and slag mixed with anti corrosion properties of cement paste can be improved to a certain extent, but the composite slurry mixed with slag anti corrosion performance better. (2) developed 6M ammonium chloride under accelerated corrosion of fly ash cement composite slurry and 20% fly ash different slag cement composite slurry column experimental study of calcium dissolution parts, through the dissolution depth of composite slurry porosity, calcium silicon ratio, microstructure and XRD test, the results show that the fly ash cement composite slurry mixing Slag, the erosion resistance of composite slurry was improved. (3) the establishment of the calcium dissolution of cement-based materials one-dimensional diffusion model under the condition of water erosion, and considering the influence of mineral admixture on the initial parameters of cement based materials, by adjusting the parameters of calcium dissolution model to simulate the deionized water under corrosion sheet specimens 6M and ammonium chloride corrosion conditions of cylindrical parts test calcium dissolution process, the model simulation results and the test results were compared and analyzed, the results show that the two kinds of corrosion specimens with the test results of the model are consistent with the calculation results, the better result, the model can be calcium dissolution law of soft water under the condition of corrosion of cement materials were predicted.

【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU599

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