【摘要】：混凝土的氯離子結(jié)合性能對(duì)鋼筋混凝土建筑的壽命預(yù)測(cè)及其耐久性能都具有重要意義。以結(jié)合的形式存在的氯離子對(duì)鋼筋混凝土中的鋼筋銹蝕不產(chǎn)生危害。它延緩了氯離子的擴(kuò)散速率,延長(zhǎng)了鋼筋混凝土結(jié)構(gòu)的壽命。本論文基于混凝土結(jié)合氯離子的不同方式及其原理,研究了礦物摻合料種類、摻量及其摻入方式、侵蝕環(huán)境中氯離子濃度和侵蝕液p H值對(duì)混凝土砂漿的氯離子結(jié)合性能的影響。主要研究?jī)?nèi)容和研究結(jié)果如下:分析比較了化學(xué)滴定法、電位滴定法、離子選擇電極法在混凝土氯離子濃度測(cè)量時(shí)的優(yōu)劣,并選用離子選擇電極法作為本實(shí)驗(yàn)測(cè)量氯離子濃度的方法。針對(duì)選用的離子選擇電極的響應(yīng)p H值范圍較小,采用常用方法時(shí),酸溶性氯離子濃度的測(cè)量無法滿足響應(yīng)p H值的問題,對(duì)測(cè)量方法做了部分改進(jìn)。經(jīng)過試驗(yàn)測(cè)量及檢驗(yàn)校核,該改進(jìn)方案能很好地滿足實(shí)驗(yàn)要求。研究了不同摻量下,單摻粉煤灰、礦渣、以及雙摻粉煤灰和礦渣對(duì)混凝土的氯離子結(jié)合性能的影響。研究發(fā)現(xiàn),粉煤灰和礦渣均能極大提高混凝土的氯離子結(jié)合能力,且摻量相同的情況下,前者提升作用優(yōu)于后者;二者提高的主要機(jī)理分別為物理吸附作用和化學(xué)結(jié)合作用。研究了侵蝕環(huán)境中的氯離子濃度對(duì)混凝土的氯離子結(jié)合性能的影響。研究發(fā)現(xiàn),氯離子濃度的升高,能促進(jìn)AFm相轉(zhuǎn)化為Friedel鹽的進(jìn)程,也能增大CSH凝膠等水化產(chǎn)物物理吸附氯離子的量。但由于結(jié)合劑總量一定,可結(jié)合的氯離子的總量一定,隨著氯離子濃度的升高,雖然混凝土結(jié)合的氯離子的量有所增加,但其氯離子結(jié)合能力會(huì)下降。研究了侵蝕液的p H值對(duì)混凝土的氯離子結(jié)合能力的影響。研究發(fā)現(xiàn),侵蝕液p H值的增大,不但會(huì)阻礙AFm相轉(zhuǎn)化為Friedel鹽的進(jìn)程,也會(huì)降低CSH凝膠等水化產(chǎn)物對(duì)氯離子的物理吸附能力。但對(duì)于摻礦物摻合料的實(shí)驗(yàn)組來說,當(dāng)侵蝕液p H值超過一定的值時(shí),p H值的增大能促進(jìn)礦物摻合料的二次水化反應(yīng),進(jìn)而提高混凝土的氯離子結(jié)合能力。
[Abstract]:The chloride binding properties of concrete are of great significance to the life prediction and durability of reinforced concrete buildings. The presence of chloride ions in the form of combination does not harm the corrosion of steel bars in reinforced concrete. It delays the diffusion rate of chloride ions and prolongs the life of reinforced concrete structures. Based on the different ways and principles of chloride ion binding in concrete, the types, amounts and ways of mineral admixtures are studied in this paper. Effects of chloride concentration and pH value of erosive fluid on chloride binding properties of concrete mortar. The main contents and results are as follows: the advantages and disadvantages of chemical titration, potentiometric titration and ion selective electrode in the measurement of chloride concentration in concrete are analyzed and compared. The ion selective electrode method was used to measure the concentration of chloride ion in this experiment. In view of the small range of response pH value of the ion selective electrode, the measurement of acid soluble chloride ion concentration can not meet the problem of response pH value when the commonly used method is used, so the measurement method has been partially improved. After experimental measurement and verification, the improved scheme can well meet the requirements of the experiment. The effects of fly ash, slag, fly ash and slag on the chloride binding properties of concrete were studied. It is found that both fly ash and slag can greatly improve the chloride binding capacity of concrete, and the lifting effect of the former is better than that of the latter when the content is the same, and the main mechanisms of their improvement are physical adsorption and chemical binding respectively. The effect of chloride concentration in erosive environment on chloride binding properties of concrete was studied. It was found that the increase of chloride concentration could promote the conversion of AFm phase to Friedel salt and increase the amount of chloride ions physically adsorbed by hydration products such as CSH gel. However, because the total amount of binder is constant and the total amount of binding chloride is constant, with the increase of chloride ion concentration, the amount of chloride ion bound in concrete increases, but the chloride binding capacity of concrete decreases. The effect of pH value of erosive fluid on chloride binding capacity of concrete was studied. It is found that the increase of pH value not only hinders the process of AFm phase conversion to Friedel salt, but also reduces the physical adsorption ability of hydrated products such as CSH gel to chlorine ions. But for the experimental group with mineral admixture, when the pH value of erosive fluid exceeds a certain value, the increase of pH value can promote the secondary hydration reaction of mineral admixture, and then improve the chloride binding ability of concrete.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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