本文選題：聚脲彈性體　切入點(diǎn)：丙乳砂漿　出處：《南京航空航天大學(xué)》2016年碩士論文

【摘要】：隨著我國(guó)基礎(chǔ)設(shè)施建設(shè)的迅猛發(fā)展,鋼筋混凝土結(jié)構(gòu)已經(jīng)普遍使用于橋梁工程、水利水電工程、港口航道與海岸工程等。但在水工環(huán)境下,鋼筋混凝土結(jié)構(gòu)耐久性問(wèn)題日益突出。一方面受高速含沙水流沖刷,混凝土表面會(huì)遭受較嚴(yán)重的磨損,造成鋼筋保護(hù)層減小;另一方面由于水中氯鹽侵蝕,混凝土中的鋼筋易發(fā)生銹蝕,造成混凝土結(jié)構(gòu)出現(xiàn)銹脹裂縫,表層剝落。若不及時(shí)維修,如此惡性循環(huán)則會(huì)大大降低鋼筋混凝土結(jié)構(gòu)的承載力和使用壽命。本課題通過(guò)試驗(yàn)綜合分析了聚脲彈性有機(jī)材料、丙乳砂漿和環(huán)氧砂漿的抗沖磨、抗氯離子滲透及抗碳化性能,并研究了礦渣微粉和粉煤灰分別等量取代水泥摻量的36%以內(nèi)時(shí),對(duì)丙乳砂漿的耐久性提升效果,最后通過(guò)工程實(shí)例驗(yàn)證了改性丙乳砂漿的可行性。本課題所得到結(jié)論如下:(1)聚脲材料由于自身優(yōu)異的彈性體有機(jī)材料特性,其抗沖磨性、抗氯離子滲透性及抗碳化性均遠(yuǎn)遠(yuǎn)優(yōu)于丙乳砂漿、環(huán)氧砂漿等水泥基材料。(2)隨著礦渣摻量的增加,丙乳砂漿的抗壓、抗折和抗沖磨強(qiáng)度均呈先增加后降低的趨勢(shì),最佳摻量范圍在6%～12%;礦渣摻量在9%附近時(shí),抗沖磨強(qiáng)度可提高約18%;隨礦渣摻量的增加,改性丙乳砂漿的氯離子滲透系數(shù)呈線性降低的趨勢(shì),摻量在36%時(shí),其氯離子滲透系數(shù)降低約59%;(3)隨著粉煤灰摻量的增加,丙乳砂漿的抗壓、抗折強(qiáng)度、粘結(jié)抗折強(qiáng)度和抗碳化性均呈線性降低的趨勢(shì);抗沖磨強(qiáng)度呈先增加后降低的趨勢(shì),粉煤灰最佳摻量在6%附近,抗沖磨強(qiáng)度提高約12%;丙乳砂漿的氯離子滲透系數(shù)呈先降低而后增加的趨勢(shì),粉煤灰摻量不宜超過(guò)18%。(4)同摻量條件下,礦渣改性丙乳砂漿的耐久性能優(yōu)于粉煤灰改性丙乳砂漿,根據(jù)工程要求,若需獲得較高的力學(xué)性能、抗沖磨性及抗碳化性,礦渣摻量建議在6%～12%;若僅考慮抗氯離子滲透性能,摻量建議在36%。
[Abstract]:With the rapid development of infrastructure construction in China, reinforced concrete structures have been widely used in bridge engineering, water conservancy and hydropower engineering, port waterway and coastal engineering, etc. The durability problem of reinforced concrete structure is becoming more and more serious. On the one hand, the surface of concrete will suffer more serious wear, resulting in the decrease of the protective layer of steel bar; on the other hand, because of chlorine salt erosion in water, the concrete surface will suffer more serious wear and tear. Steel bars in concrete are prone to rust, resulting in corrosion cracks in the concrete structure, surface exfoliation. If not repaired in time, This vicious circle will greatly reduce the bearing capacity and service life of reinforced concrete structures. This paper comprehensively analyzes the impact and wear resistance, chloride ion penetration resistance and carbonation resistance of polyurea elastic organic materials, acrylic emulsion mortar and epoxy mortar. The effects of slag powder and fly ash on the durability of acrylic emulsion mortar were studied when the cement content was replaced by the same amount of slag powder and fly ash respectively within 36% of the cement content. Finally, the feasibility of modified acrylic emulsion mortar is verified by an engineering example. The conclusion of this paper is as follows: 1) the impact and wear resistance of polyurea material is due to its excellent properties of elastomer organic materials. The penetration resistance and carbonation resistance of acrylic emulsion mortar are much better than those of acrylic emulsion mortar. With the increase of slag content, the compressive strength, flexural strength and impact wear resistance of acrylic emulsion mortar increase first and then decrease with the increase of slag content. When the slag content is about 9%, the impact and wear strength can be increased by about 18%. With the increase of slag content, the chloride permeation coefficient of modified acrylic emulsion mortar tends to decrease linearly, and when the content of slag is about 9%, the chloride ion permeability coefficient of modified acrylic emulsion mortar decreases linearly, and when the slag content is about 9%, the chloride ion permeability coefficient of the modified acrylic emulsion mortar decreases linearly with the increase of slag content. With the increase of the content of fly ash, the compressive strength, flexural strength, bond flexural strength and carbonation resistance of acrylic emulsion mortar decreased linearly, and the impact wear strength increased first and then decreased. The best content of fly ash is about 6%, the strength of abrasion resistance is increased by 12%, the permeability coefficient of chloride ion of acrylic emulsion mortar decreases first and then increases, and the content of fly ash should not exceed 18%. The durability of slag modified acrylic emulsion mortar is better than that of fly ash modified acrylic emulsion mortar. According to the engineering requirements, if we need to obtain higher mechanical properties, abrasion resistance and carbonation resistance, the slag content is suggested to be at 6 / 12. The dosage is suggested at 36.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TV431

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