偏高嶺土—礦渣體系輕骨料混凝土的制備與性能研究
發(fā)布時(shí)間：2019-04-15 12:22
【摘要】：高強(qiáng)高性能混凝土是目前工程中被廣泛應(yīng)用的材料。為了減輕普通混凝土的重量并希望將其運(yùn)用于一些特定的環(huán)境中,人們制備出了高強(qiáng)高性能輕骨料混凝土。這種輕骨料混凝土因具有輕質(zhì)、高強(qiáng)、高耐久、耐火等特點(diǎn),而被大量應(yīng)用于高層建筑和橋梁工程。為了彌補(bǔ)高性能輕骨料混凝土收縮較大的缺陷,國(guó)內(nèi)外許多研究者們采用摻火山灰材料等技術(shù)措施改善輕骨料混凝土,以改善輕骨料混凝土的體積穩(wěn)定性。偏高嶺土是一種高活性的火山灰材料,對(duì)混凝土性能的改善效果與硅灰相近,遠(yuǎn)遠(yuǎn)高于粉煤灰和礦渣。偏高嶺土還能大幅減少混凝土的收縮,且價(jià)格比硅灰低。故使用偏高嶺土替代硅灰制備高性能輕骨料混凝土具有較高的理論意義和實(shí)用價(jià)值。另一方面,沿海地區(qū)混凝土工程和海上混凝土工程中使用的水是自來水或者淡化后的海水。水的運(yùn)輸和處理增加了工程成本。海水中富含多種鹽,部分鹽能促進(jìn)水化,部分鹽離子會(huì)導(dǎo)致混凝土結(jié)構(gòu)的破壞,其中,海水中的氯離子是造成鋼筋銹蝕和結(jié)構(gòu)破壞的主要介質(zhì)。研究表明,偏高嶺土具有很強(qiáng)氯離子能力固化能力,那么,在海水拌合制備的混凝土中,摻入適量偏高嶺土能否彌補(bǔ)海水帶來的不良影響,同時(shí)又保留海水對(duì)混凝土的好的影響?此問題值得我們研究。鑒于此,本文使用了偏高嶺土和礦渣制備了淡水和海水兩種體系的輕骨料混凝土。礦渣的使用能降低混凝土的成本,并能改善混凝土的堆積結(jié)構(gòu),使混凝土結(jié)構(gòu)更加緊密。在保證混凝土工作性能的前提下,本文通過XRD、SEM、DSC-TG、MIP等先進(jìn)的測(cè)試方法研究了不同摻量的偏高嶺土和礦渣對(duì)輕骨料混凝土宏觀及微觀性能的影響,研究了海水和偏高嶺土、礦渣對(duì)輕骨料混凝土性能的復(fù)合影響,分析了使用海水和偏高嶺土、礦粉制備輕骨料混凝土的可行性。本文的主要成果如下:1、本文結(jié)合力學(xué)性能與微觀結(jié)構(gòu),證明了單獨(dú)摻入偏高嶺土和礦渣均可以提高輕骨料混凝土的性能,而單獨(dú)摻入偏高嶺土效果更佳。復(fù)合摻入偏高嶺土和礦渣能進(jìn)一步提升混凝土的力學(xué)性能。復(fù)合摻入偏高嶺土和礦渣時(shí),最佳摻量為10%偏高嶺土和10%礦渣。實(shí)驗(yàn)證明,偏高嶺土和礦渣有效改善了輕骨料混凝土過渡界面區(qū)的結(jié)構(gòu),增強(qiáng)了界面過渡區(qū)骨料和水泥漿體間的結(jié)合,提高了界面的強(qiáng)度,并改善了水泥漿體的組成與結(jié)構(gòu),從而提高輕骨料混凝土的宏觀力學(xué)性能。2、相比淡水體系輕骨料混凝土,海水體系輕骨料混凝土微觀結(jié)構(gòu)更密實(shí),過渡界面區(qū)強(qiáng)度更高,混凝土抗壓強(qiáng)度更高。實(shí)驗(yàn)證明了海水的使用能提高輕骨料混凝土的力學(xué)性能。且海水不影響礦物摻合料對(duì)混凝土性能的改善作用。3、測(cè)試結(jié)果證明,海水引入了大量氯離子,部分氯離子與水化產(chǎn)物反應(yīng)生成弗里德爾鹽。偏高嶺土和礦渣的摻入能提高弗里德爾鹽的生成量,生成量隨著偏高嶺土和礦渣摻量的增加而增加。海水還會(huì)促進(jìn)水泥水化,生成更多水化產(chǎn)物。而偏高嶺土和礦渣能通過大量消耗水化產(chǎn)物Ca(OH)2促進(jìn)水泥的水化。4、未摻入礦物的輕骨料混凝土的抗氯離子侵蝕能力較低。摻入偏高嶺土和礦渣均能增強(qiáng)輕骨料混凝土的抗氯離子侵蝕性能,復(fù)合摻入偏高嶺土和礦渣效果最佳。而海水的引入會(huì)降低混凝土抗氯離子滲透性能,降低混凝土耐久性。摻入偏高嶺土和礦渣后能明顯改善海水體系輕骨料混凝土抗氯離子滲透性能,能彌補(bǔ)海水引入的離子所帶來的不良影響。5、未摻入礦物的輕骨料混凝土的體積收縮變形量較大。摻入偏高嶺土和礦渣均能減少輕骨料混凝土的體積收縮。單獨(dú)摻入偏高嶺土效果比單獨(dú)摻入礦渣效果好,在一定摻量條件下,隨著偏高嶺土摻量的增加,輕骨料混凝土的體積變形量越小。復(fù)合摻入偏高嶺土和礦渣能在單獨(dú)摻入某一礦物的改善效果上進(jìn)一步減少輕骨料混凝土的體積收縮。但當(dāng)偏高嶺土摻量達(dá)10%后,再摻入礦渣時(shí)對(duì)輕骨料混凝土的體積變形影響很小。
[Abstract]:High-strength and high-performance concrete is a widely used material in the current project. High-strength and high-performance light aggregate concrete is prepared in order to reduce the weight of the common concrete and to use it in a number of specific environments. The lightweight aggregate concrete has the characteristics of light weight, high strength, high durability, fire resistance and the like, and is widely applied to high-rise building and bridge engineering. In order to make up for the defects of high performance and light aggregate concrete shrinkage, many researchers at home and abroad use the technical measures such as pozzolanic material to improve the light aggregate concrete to improve the volume stability of the lightweight aggregate concrete. The metakaolin is a highly active pozzolanic material, and the effect of improving the performance of the concrete is similar to that of the silicon ash, which is much higher than that of the fly ash and the slag. The metakaolin can also greatly reduce the shrinkage of the concrete, and the price is lower than that of the silicon ash. Therefore, the use of metakaolin for the preparation of high-performance light-aggregate concrete with high-performance light-aggregate concrete has higher theoretical and practical value. On the other hand, the water used in the coastal concrete and marine concrete works is tap water or desalinated seawater. The transportation and treatment of water increases the cost of the work. The sea water is rich in various salts, some of which can promote the hydration, and some of the salt ions can cause the destruction of the concrete structure, in which the chloride ion in the seawater is the main medium which causes the corrosion and the structure of the steel bar. The research shows that the metakaolin has a strong ability to cure the chloride ion, then, in the concrete prepared by sea water mixing, it can make up the bad influence of the sea water by adding a proper amount of metakaolin, and at the same time, keep the good effect of the sea water on the concrete. The question is worthy of our study. In view of this, the paper uses the metakaolin and the slag to prepare the light aggregate concrete of the two systems of fresh water and sea water. The use of the slag can reduce the cost of the concrete, and can improve the stacking structure of the concrete and make the concrete structure more compact. The effects of different amounts of metakaolin and slag on the macro-and micro-properties of light-aggregate concrete were studied by means of advanced test methods such as XRD, SEM, DSC-TG and MIP. The effects of different amounts of metakaolin and slag on the macro-and micro-properties of light-aggregate concrete were studied by means of advanced test methods such as XRD, SEM, DSC-TG and MIP. The effect of slag on the performance of light aggregate concrete is analyzed, and the feasibility of using sea water and metakaolin and mineral powder to prepare lightweight aggregate concrete is analyzed. The main results of this paper are as follows:1. The properties of the lightweight aggregate concrete can be improved by the combination of the mechanical properties and the microstructure. The composite incorporation of the metakaolin and the slag can further improve the mechanical properties of the concrete. The optimum mixing amount is 10% metakaolin and 10% slag when mixed with metakaolin and slag. the experiment proves that the metakaolin and the slag can effectively improve the structure of the transition interface area of the light aggregate concrete, enhance the bonding between the aggregate and the cement slurry body in the interface transition area, improve the strength of the interface, and improve the composition and the structure of the cement slurry body, So as to improve the macro-mechanical property of the light aggregate concrete, and 2, the light aggregate concrete of the fresh water system is more dense than the light aggregate concrete of the seawater system, the strength of the transition interface area is higher, and the compressive strength of the concrete is higher. The experiment shows that the use of sea water can improve the mechanical properties of light aggregate concrete. And the seawater does not influence the improvement of the mineral admixture on the performance of the concrete. The incorporation of the metakaolin and the slag can increase the amount of the Friedel salt, and the amount of production is increased with the increase of the amount of the metakaolin and the slag. The sea water will also promote the hydration of the cement to produce more hydration products. And the metakaolin and the slag can promote the hydration of the cement by a large amount of the hydration product Ca (OH)2. The addition of the metakaolin and the slag can enhance the chloride ion corrosion resistance of the light aggregate concrete, and the combination of the metakaolin and the slag is the best. And the introduction of sea water can reduce the chloride ion penetration performance of the concrete and reduce the durability of the concrete. After the addition of the metakaolin and the slag, the anti-chloride ion permeability of the light aggregate concrete of the seawater system can be obviously improved, the adverse effect caused by the ions introduced by the seawater can be compensated, and the volume shrinkage deformation amount of the lightweight aggregate concrete which is not incorporated into the mineral is large. The incorporation of metakaolin and slag can reduce the volume shrinkage of light aggregate concrete. The effect of separately incorporating the metakaolin is better than that of the separately incorporated slag, and the smaller the volume deformation of the lightweight aggregate concrete with the increase of the amount of the metakaolin in a certain amount. The composite incorporation of the metakaolin and the slag can further reduce the volume contraction of the lightweight aggregate concrete on the basis of the improved effect of the incorporation of a mineral alone. However, when the amount of the metakaolin reaches 10%, the volume deformation of the lightweight aggregate concrete is very small when the slag is mixed with the slag.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528
[Abstract]:High-strength and high-performance concrete is a widely used material in the current project. High-strength and high-performance light aggregate concrete is prepared in order to reduce the weight of the common concrete and to use it in a number of specific environments. The lightweight aggregate concrete has the characteristics of light weight, high strength, high durability, fire resistance and the like, and is widely applied to high-rise building and bridge engineering. In order to make up for the defects of high performance and light aggregate concrete shrinkage, many researchers at home and abroad use the technical measures such as pozzolanic material to improve the light aggregate concrete to improve the volume stability of the lightweight aggregate concrete. The metakaolin is a highly active pozzolanic material, and the effect of improving the performance of the concrete is similar to that of the silicon ash, which is much higher than that of the fly ash and the slag. The metakaolin can also greatly reduce the shrinkage of the concrete, and the price is lower than that of the silicon ash. Therefore, the use of metakaolin for the preparation of high-performance light-aggregate concrete with high-performance light-aggregate concrete has higher theoretical and practical value. On the other hand, the water used in the coastal concrete and marine concrete works is tap water or desalinated seawater. The transportation and treatment of water increases the cost of the work. The sea water is rich in various salts, some of which can promote the hydration, and some of the salt ions can cause the destruction of the concrete structure, in which the chloride ion in the seawater is the main medium which causes the corrosion and the structure of the steel bar. The research shows that the metakaolin has a strong ability to cure the chloride ion, then, in the concrete prepared by sea water mixing, it can make up the bad influence of the sea water by adding a proper amount of metakaolin, and at the same time, keep the good effect of the sea water on the concrete. The question is worthy of our study. In view of this, the paper uses the metakaolin and the slag to prepare the light aggregate concrete of the two systems of fresh water and sea water. The use of the slag can reduce the cost of the concrete, and can improve the stacking structure of the concrete and make the concrete structure more compact. The effects of different amounts of metakaolin and slag on the macro-and micro-properties of light-aggregate concrete were studied by means of advanced test methods such as XRD, SEM, DSC-TG and MIP. The effects of different amounts of metakaolin and slag on the macro-and micro-properties of light-aggregate concrete were studied by means of advanced test methods such as XRD, SEM, DSC-TG and MIP. The effect of slag on the performance of light aggregate concrete is analyzed, and the feasibility of using sea water and metakaolin and mineral powder to prepare lightweight aggregate concrete is analyzed. The main results of this paper are as follows:1. The properties of the lightweight aggregate concrete can be improved by the combination of the mechanical properties and the microstructure. The composite incorporation of the metakaolin and the slag can further improve the mechanical properties of the concrete. The optimum mixing amount is 10% metakaolin and 10% slag when mixed with metakaolin and slag. the experiment proves that the metakaolin and the slag can effectively improve the structure of the transition interface area of the light aggregate concrete, enhance the bonding between the aggregate and the cement slurry body in the interface transition area, improve the strength of the interface, and improve the composition and the structure of the cement slurry body, So as to improve the macro-mechanical property of the light aggregate concrete, and 2, the light aggregate concrete of the fresh water system is more dense than the light aggregate concrete of the seawater system, the strength of the transition interface area is higher, and the compressive strength of the concrete is higher. The experiment shows that the use of sea water can improve the mechanical properties of light aggregate concrete. And the seawater does not influence the improvement of the mineral admixture on the performance of the concrete. The incorporation of the metakaolin and the slag can increase the amount of the Friedel salt, and the amount of production is increased with the increase of the amount of the metakaolin and the slag. The sea water will also promote the hydration of the cement to produce more hydration products. And the metakaolin and the slag can promote the hydration of the cement by a large amount of the hydration product Ca (OH)2. The addition of the metakaolin and the slag can enhance the chloride ion corrosion resistance of the light aggregate concrete, and the combination of the metakaolin and the slag is the best. And the introduction of sea water can reduce the chloride ion penetration performance of the concrete and reduce the durability of the concrete. After the addition of the metakaolin and the slag, the anti-chloride ion permeability of the light aggregate concrete of the seawater system can be obviously improved, the adverse effect caused by the ions introduced by the seawater can be compensated, and the volume shrinkage deformation amount of the lightweight aggregate concrete which is not incorporated into the mineral is large. The incorporation of metakaolin and slag can reduce the volume shrinkage of light aggregate concrete. The effect of separately incorporating the metakaolin is better than that of the separately incorporated slag, and the smaller the volume deformation of the lightweight aggregate concrete with the increase of the amount of the metakaolin in a certain amount. The composite incorporation of the metakaolin and the slag can further reduce the volume contraction of the lightweight aggregate concrete on the basis of the improved effect of the incorporation of a mineral alone. However, when the amount of the metakaolin reaches 10%, the volume deformation of the lightweight aggregate concrete is very small when the slag is mixed with the slag.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 秦淑芳;申向東;;偏高嶺土對(duì)天然輕骨料混凝土力學(xué)性能影響的研究[J];硅酸鹽通報(bào);2013年06期
2 水中和;王康;陳偉;孔，
本文編號(hào)：2458151
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