硅酸鹽水泥—硫鋁酸鹽水泥基修補(bǔ)材料及防腐抗?jié)B性能研究
發(fā)布時間：2018-07-28 17:02
【摘要】：硫鋁酸鹽水泥(SAC)具有良好的防腐抗?jié)B性能,作為修補(bǔ)材料可以很好被應(yīng)用于混凝土建筑物的修補(bǔ)及海洋建筑的防腐抗?jié)B等工程。然而,硫鋁酸鹽水泥的生產(chǎn)成本高,使其在實際工程中的推廣應(yīng)用受到限制。因此,為了滿足混凝土結(jié)構(gòu)工程的防腐抗?jié)B需求并降低修補(bǔ)成本,本實驗研究了硅酸鹽-硫鋁酸鹽水泥復(fù)合為膠凝材料的基本性能,同時利用超細(xì)粉煤灰取代水泥,丁苯乳液(SBR)對復(fù)合水泥進(jìn)行改性,采用機(jī)制砂為骨料,制備具有優(yōu)良防腐抗?jié)B性能且成本較低的修補(bǔ)材料。主要的研究結(jié)果如下:(1)SAC可以促進(jìn)硅酸鹽水泥的水化,縮短水泥凝結(jié)時間;SAC水化可以產(chǎn)生微膨脹,降低復(fù)合水泥的孔隙率,提高水泥的力學(xué)性能,減小干燥收縮。當(dāng)SAC摻量為6%時,復(fù)合水泥砂漿后期的抗折強(qiáng)度和抗壓強(qiáng)度達(dá)到最大值,其28d抗折強(qiáng)度為9.2MPa和55.2MPa,干燥收縮值最小。當(dāng)摻量超過6%時,SAC水化產(chǎn)生過大的微膨脹,導(dǎo)致硬化水泥漿體產(chǎn)生微裂紋,增大孔隙率,力學(xué)性能逐漸降低,干燥收縮值達(dá)到平衡。利用超聲波測試技術(shù)可以對復(fù)合水泥體系的微觀裂紋進(jìn)行表征。(2)粉煤灰具有“球體效應(yīng)”可以改善水泥漿體的流動度,然而過多摻量超細(xì)粉煤灰可以降低水泥漿體的流動度。此外,粉煤灰在堿性條件下可以發(fā)生火山灰反應(yīng),趨向生成的C-S-H凝膠數(shù)量增大,可進(jìn)一步降低水泥漿體的孔隙率,提高水泥力學(xué)性能。摻入10%的粉煤灰可顯著改善水泥漿體的流動度;當(dāng)摻入20%超細(xì)粉煤灰時,水泥的抗折和抗壓強(qiáng)度達(dá)到最大值,28d抗壓強(qiáng)度為59.9MPa,抗折強(qiáng)度10.0MPa。利用20%超細(xì)粉煤灰的水泥漿體的最可幾孔徑尺寸最低。因此,20%超細(xì)粉煤灰取代復(fù)合水泥可以作為混凝土的修補(bǔ)抗?jié)B材料。(3)引入的氣體可以改善水泥漿體的流動度,當(dāng)水灰比分別為0.4和0.5時,聚灰比(P/C)為15%的SBR改性水泥凈漿的流動度分別增大37.4%和39.6%。此外,SBR改性水泥漿體的含氣量與流動度具有良好的線性關(guān)系,相關(guān)性為R2=0.988。SBR可以降低水的表面張力且改善其在水中的分布規(guī)律。這主要是由于為了溶液體系能量最低,SBR乳液在溶液表面的溶度大于本體溶液的濃度,使SBR分子趨向在水溶液表面存在,并且極性的憎水基團(tuán)指向空氣。因此SBR與水泥漿體在攪拌的過程中增強(qiáng)引氣作用。(4)SBR在水泥水化過程中可以形成連續(xù)的膜結(jié)構(gòu),有效的降低硬化水泥孔隙率,然而其引氣作用可以增大漿體的孔隙率。養(yǎng)護(hù)3d試樣,隨著P/C的增大,水泥漿體的孔隙率增加。養(yǎng)護(hù)28d的試樣,隨著水泥水化進(jìn)行,總孔隙率相比3d降低。當(dāng)P/C=2%和4%時,水泥漿體的孔隙率降低;當(dāng)P/C超過4%時,水泥漿體的孔隙率增大,其10μm-200μm的大孔數(shù)量減少明顯;0.003μm-0.01μm的大孔數(shù)量明顯增多。因此,丁苯乳液主要影響10μm-200μm和0.003μm-0.01μm范圍的孔分布。因此,當(dāng)P/C=2%-4%時,SBR乳液改性水泥砂漿孔隙率最低,適合作為修補(bǔ)防水材料。(5)水泥砂漿隨著SBR摻量增大,其抗壓強(qiáng)度逐漸降低,抗折強(qiáng)度先降低后增大。此外,壓折比逐漸降低,即SBR改善水泥砂漿的韌性。養(yǎng)護(hù)28d時,SBR改性水泥砂漿的防水性及耐久性得到改善。當(dāng)P/C為2%和4%時,SBR改性水泥砂漿試樣的吸水率明顯低于OPC試樣,P/C=4%時吸水率達(dá)到最低值;此外,P/C為2%和4%的水泥試樣,其抗凍性能,抗氯離子滲透性能及抗硫鋁酸侵蝕性能達(dá)到最佳。因此,當(dāng)P/C=2%-4%時,SBR乳液改性水泥砂漿適合作為防腐的修補(bǔ)材料。(6)SBR可以提高水泥砂漿的粘結(jié)強(qiáng)度,相比空白試樣,當(dāng)P/C=15%時,養(yǎng)護(hù)3d,7d和28d的砂漿試樣的粘結(jié)強(qiáng)度分別提高70%,50%和58%。在水化過程中,SBR可以形成具有憎水作用的膜結(jié)構(gòu),可以降低水分在基體與界面的傳輸,有效的降低界面孔隙率,減小干燥收縮,提高“有效的粘結(jié)面積”。此外,SBR降低Ca(OH)2的定向生長和阻止界面過渡區(qū)裂縫形成。
[Abstract]:Sulphoaluminate cement (SAC) has good anti-corrosion and anti permeability properties. As a repair material, it can be well applied to repair of concrete buildings and anticorrosion and anti-seepage engineering of marine buildings. However, the production cost of sulphoaluminate cement is high and its application in practical engineering is limited. Therefore, in order to meet the structure of concrete construction, In this experiment, the basic properties of silicate sulphoaluminate cement composite cementitious material are studied in this experiment. At the same time, superfine fly ash is used to replace cement and styrene butadiene emulsion (SBR) is used to modify the composite cement. The mechanism sand is used as aggregate to make the repair with excellent anti-corrosion and permeability and low cost. The main research results are as follows: (1) SAC can promote the hydration of Portland cement and shorten the setting time of cement; SAC hydration can produce micro expansion, reduce the porosity of composite cement, improve the mechanical properties of cement and reduce the drying shrinkage. When the content of SAC is 6%, the flexural strength and compressive strength of the later cement mortar reach the maximum. The flexural strength of 28d is 9.2MPa and 55.2MPa, and the drying shrinkage value is the smallest. When the dosage is more than 6%, the hydration of SAC produces a large micro expansion, which causes the hardening cement paste to produce micro cracks, increase the porosity, the mechanical properties gradually decrease, and the drying shrinkage value reaches the balance. The micro crack of the composite cement system can be cracked by ultrasonic wave testing technology. (2) the fluidity of cement slurry can be improved by the "ball effect" of fly ash. However, the fluidity of cement slurry can be reduced by the excess of superfine fly ash. In addition, the ash can occur in the alkaline condition, and the amount of C-S-H gel tends to increase, which can further reduce the porosity of cement slurry. To improve the mechanical properties of cement, adding 10% fly ash can significantly improve the fluidity of cement paste; when adding 20% ultrafine fly ash, the flexural and compressive strength of cement reaches the maximum, the compressive strength of 28d is 59.9MPa, and the maximum size of the cement slurry with 20% superfine fly ash is the lowest. Therefore, 20% superfine powder The mixed cement can be used as a mending anti seepage material for concrete. (3) the flow degree of cement slurry can be improved by the gas introduced. When the ratio of water to cement ratio is 0.4 and 0.5, the flow degree of SBR modified cement paste with ash ratio (P/C) is increased by 37.4% and 39.6%. respectively, and the gas content and fluidity of the SBR modified cement paste are good. The good linear relation is that R2=0.988.SBR can reduce the surface tension of water and improve its distribution in water. This is mainly because the solubility of the SBR emulsion on the solution surface is greater than the concentration of the bulk solution for the lowest energy of the solution system, so that the SBR molecules tend to exist on the surface of water solution, and the polar hydrophobic group points to the air. Gas. Therefore, SBR and cement slurry can enhance the air entraining effect during the mixing process. (4) SBR can form continuous membrane structure during the hydration process of cement, effectively reducing the porosity of hardened cement, but its air entraining effect can increase the porosity of the slurry. The porosity of the cement paste will be cured with the increase of the P/C, the test of the porosity of the cement paste is increased. The test of the curing of the 28d With the hydration of cement, the total porosity decreased compared with 3D. When P/C=2% and 4%, the porosity of cement slurry decreased; when P/C exceeded 4%, the porosity of cement slurry increased, the number of macropores of its 10 mu M-200 m decreased obviously; the number of large pores in 0.003 mu m-0.01 m increased obviously. Therefore, the styrene butadiene emulsion mainly affected 10 u M-200 mu m and 0.003 micron m-0.0. The pore distribution of 1 mu m range. Therefore, when P/C=2%-4%, the porosity of SBR emulsion modified cement mortar is the lowest, it is suitable for repairing waterproof material. (5) the compressive strength of cement mortar decreases gradually with the increase of the content of SBR, and the flexural strength decreases first and then increases. In addition, the compression ratio decreases gradually, that is, SBR improves the toughness of cement mortar. SBR modification when 28d is cured. The waterproof and durability of the cement mortar are improved. When P/C is 2% and 4%, the water absorption of the SBR modified cement mortar is obviously lower than that of the OPC sample, and the water absorbency reaches the lowest value at P/C=4%. In addition, the P/C is 2% and 4% of the cement sample, and its frost resistance, the chloride permeability and the corrosion resistance of sulphoaluminate are best. Therefore, when P/C=2% When -4%, SBR emulsion modified cement mortar is suitable as an anticorrosion repair material. (6) SBR can improve the bond strength of cement mortar. When compared to blank sample, when P/C=15%, the bond strength of the mortar specimens cured by 3D, 7d and 28d is increased by 70%, 50% and 58%. in the hydration process, SBR can form a hydrophobic membrane structure, which can be reduced. The transport of water in the matrix and interface effectively reduces the porosity of the interface, reduces the drying shrinkage and increases the "effective bond area". In addition, SBR reduces the directional growth of Ca (OH) 2 and prevents the formation of cracks in the interface transition zone.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ172.7
本文編號：2150963
[Abstract]:Sulphoaluminate cement (SAC) has good anti-corrosion and anti permeability properties. As a repair material, it can be well applied to repair of concrete buildings and anticorrosion and anti-seepage engineering of marine buildings. However, the production cost of sulphoaluminate cement is high and its application in practical engineering is limited. Therefore, in order to meet the structure of concrete construction, In this experiment, the basic properties of silicate sulphoaluminate cement composite cementitious material are studied in this experiment. At the same time, superfine fly ash is used to replace cement and styrene butadiene emulsion (SBR) is used to modify the composite cement. The mechanism sand is used as aggregate to make the repair with excellent anti-corrosion and permeability and low cost. The main research results are as follows: (1) SAC can promote the hydration of Portland cement and shorten the setting time of cement; SAC hydration can produce micro expansion, reduce the porosity of composite cement, improve the mechanical properties of cement and reduce the drying shrinkage. When the content of SAC is 6%, the flexural strength and compressive strength of the later cement mortar reach the maximum. The flexural strength of 28d is 9.2MPa and 55.2MPa, and the drying shrinkage value is the smallest. When the dosage is more than 6%, the hydration of SAC produces a large micro expansion, which causes the hardening cement paste to produce micro cracks, increase the porosity, the mechanical properties gradually decrease, and the drying shrinkage value reaches the balance. The micro crack of the composite cement system can be cracked by ultrasonic wave testing technology. (2) the fluidity of cement slurry can be improved by the "ball effect" of fly ash. However, the fluidity of cement slurry can be reduced by the excess of superfine fly ash. In addition, the ash can occur in the alkaline condition, and the amount of C-S-H gel tends to increase, which can further reduce the porosity of cement slurry. To improve the mechanical properties of cement, adding 10% fly ash can significantly improve the fluidity of cement paste; when adding 20% ultrafine fly ash, the flexural and compressive strength of cement reaches the maximum, the compressive strength of 28d is 59.9MPa, and the maximum size of the cement slurry with 20% superfine fly ash is the lowest. Therefore, 20% superfine powder The mixed cement can be used as a mending anti seepage material for concrete. (3) the flow degree of cement slurry can be improved by the gas introduced. When the ratio of water to cement ratio is 0.4 and 0.5, the flow degree of SBR modified cement paste with ash ratio (P/C) is increased by 37.4% and 39.6%. respectively, and the gas content and fluidity of the SBR modified cement paste are good. The good linear relation is that R2=0.988.SBR can reduce the surface tension of water and improve its distribution in water. This is mainly because the solubility of the SBR emulsion on the solution surface is greater than the concentration of the bulk solution for the lowest energy of the solution system, so that the SBR molecules tend to exist on the surface of water solution, and the polar hydrophobic group points to the air. Gas. Therefore, SBR and cement slurry can enhance the air entraining effect during the mixing process. (4) SBR can form continuous membrane structure during the hydration process of cement, effectively reducing the porosity of hardened cement, but its air entraining effect can increase the porosity of the slurry. The porosity of the cement paste will be cured with the increase of the P/C, the test of the porosity of the cement paste is increased. The test of the curing of the 28d With the hydration of cement, the total porosity decreased compared with 3D. When P/C=2% and 4%, the porosity of cement slurry decreased; when P/C exceeded 4%, the porosity of cement slurry increased, the number of macropores of its 10 mu M-200 m decreased obviously; the number of large pores in 0.003 mu m-0.01 m increased obviously. Therefore, the styrene butadiene emulsion mainly affected 10 u M-200 mu m and 0.003 micron m-0.0. The pore distribution of 1 mu m range. Therefore, when P/C=2%-4%, the porosity of SBR emulsion modified cement mortar is the lowest, it is suitable for repairing waterproof material. (5) the compressive strength of cement mortar decreases gradually with the increase of the content of SBR, and the flexural strength decreases first and then increases. In addition, the compression ratio decreases gradually, that is, SBR improves the toughness of cement mortar. SBR modification when 28d is cured. The waterproof and durability of the cement mortar are improved. When P/C is 2% and 4%, the water absorption of the SBR modified cement mortar is obviously lower than that of the OPC sample, and the water absorbency reaches the lowest value at P/C=4%. In addition, the P/C is 2% and 4% of the cement sample, and its frost resistance, the chloride permeability and the corrosion resistance of sulphoaluminate are best. Therefore, when P/C=2% When -4%, SBR emulsion modified cement mortar is suitable as an anticorrosion repair material. (6) SBR can improve the bond strength of cement mortar. When compared to blank sample, when P/C=15%, the bond strength of the mortar specimens cured by 3D, 7d and 28d is increased by 70%, 50% and 58%. in the hydration process, SBR can form a hydrophobic membrane structure, which can be reduced. The transport of water in the matrix and interface effectively reduces the porosity of the interface, reduces the drying shrinkage and increases the "effective bond area". In addition, SBR reduces the directional growth of Ca (OH) 2 and prevents the formation of cracks in the interface transition zone.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ172.7
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