纳米CaCO_3对水泥基材料的作用、机理及应用研究
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摘要
本论文通过研究纳米粒子在水泥基材料中的机理、作用以及应用效果,实现纳米材料工程应用。论文研究了纳米Si02、纳米CaC03及中间体的分散和作用效果；从微观角度阐明了纳米粒子对水泥基材料的作用机理；研究了矿物掺合料载负纳米CaC03中间体制成的纳米改性复合矿物掺合料的性能；此外还研究了矿物掺合料作为纳米粒子载体的适用性。在试验研究中,设计了纳米粒子对水泥基材料作用机理的试验方法,采用了XRD、SEM、表面显微硬度等测试手段；此外也依据工程应用需要,采用稠度、强度、氯离子渗透、碳化和抗冻等试验方法考察了纳米材料的应用效果。
试验研究表明纳米粒子对水泥基材料的主要作用机理是晶核作用和填充效应,纳米粒子同步发挥填充和晶核作用,促进水泥水化进程,减少浆体孔隙,细化水化产物晶型,改善微观结构,提高水泥基材料的物理力学性能,特别是大幅度提高了早期强度。
提出了采用低价格的纳米CaCO3中间体改性水泥基材料,试验结果表明中间体容易分散,在纳米粒子效应作用下显著提高早期强度,其优良的分散性和经济性弥补了一般纳米材料的缺陷。结合工程应用需求,进一步提出了将纳米CaC03中间体载负于矿物掺合料,制成纳米复合矿物掺合料,发挥了纳米材料早强和矿物掺合料后期发展潜力的复合叠加作用,从应用工艺实现纳米粒子的均匀分散,有效的改善了混凝土和易性,优化了混凝土抗压强度增长规律,同时还增强了耐久性能。
此外,设计了研究纳米CaC03中间体作用机理的试验方法,用纳米浆液浸泡早龄期水泥净浆,消除水泥水化产物的交互干扰,有效地剖析了作用机理。
本研究为纳米CaC03在水泥基材料中规模化应用打开了窗口,也为实现工程中应用其它纳米材料提供了新的思路。
On the purpose of applying nano particles to engineering construction, dispersion and applicability were studied when nano SiO2, nano-CaCO3 and nano-CaC03 intermediate were added in cement. The micromechanism of Nano particles was investigated. The properties of nano composite admixtures were studied which was produced with nano-CaCO3 intermediate and slag powder. In addition, the feasibility was studied when mineral admixer used as nano particles's carrier. A new testing method was introduced to study the mechanism of nano particles, the testing methods of XRD, SEM, surface hardness were adopted in this method. Consistency, compress strength, chloride permeability, anti-carbonation capability and frost resistance were further studied on concrete with nanomaterials for engineering construction.
The testing results indicated that nano particles filled into the micro porous as nucleator in the cementitious materials accelerate the cement hydration and hardening process. At the same time, the particles also reduced crystal size of hydration products so that the compressive strength was greatly enhanced especially in the early age.
The nano CaCO3 intermediate was used in this study for its relatively low price. The test results indicated that the intermediate was well-dispersed. The early age strength of concrete was greatly enhanced. Compared with other nano material, CaCO3 intermediate has the advantages of economic and well-dispersed, In addition, a nano composite admixtures producing method was proposed. The nano CaCO3 intermediate was used to make the slag powder as carrier of nano-CaCO3 intermediate. Both the early age strength and strength growth were improved with the use of proposed nano composite admixture. The performance, mechanical properties and durability of concrete were all effectively improved with nano composite admixtures.
A new method was proposed to study the mechanism on cement-based materials with nano-CaCO3 intermediate. The cement pastes at early age were immersed into nano-CaCO3 fluid so that the interaction of hydration product of cement could be effectively eliminated.
This study focused on the application of nano-CaCO3 in cement-based materials. The research results are also helpful for the application of other nano particles in engineering.
试验研究表明纳米粒子对水泥基材料的主要作用机理是晶核作用和填充效应,纳米粒子同步发挥填充和晶核作用,促进水泥水化进程,减少浆体孔隙,细化水化产物晶型,改善微观结构,提高水泥基材料的物理力学性能,特别是大幅度提高了早期强度。
提出了采用低价格的纳米CaCO3中间体改性水泥基材料,试验结果表明中间体容易分散,在纳米粒子效应作用下显著提高早期强度,其优良的分散性和经济性弥补了一般纳米材料的缺陷。结合工程应用需求,进一步提出了将纳米CaC03中间体载负于矿物掺合料,制成纳米复合矿物掺合料,发挥了纳米材料早强和矿物掺合料后期发展潜力的复合叠加作用,从应用工艺实现纳米粒子的均匀分散,有效的改善了混凝土和易性,优化了混凝土抗压强度增长规律,同时还增强了耐久性能。
此外,设计了研究纳米CaC03中间体作用机理的试验方法,用纳米浆液浸泡早龄期水泥净浆,消除水泥水化产物的交互干扰,有效地剖析了作用机理。
本研究为纳米CaC03在水泥基材料中规模化应用打开了窗口,也为实现工程中应用其它纳米材料提供了新的思路。
On the purpose of applying nano particles to engineering construction, dispersion and applicability were studied when nano SiO2, nano-CaCO3 and nano-CaC03 intermediate were added in cement. The micromechanism of Nano particles was investigated. The properties of nano composite admixtures were studied which was produced with nano-CaCO3 intermediate and slag powder. In addition, the feasibility was studied when mineral admixer used as nano particles's carrier. A new testing method was introduced to study the mechanism of nano particles, the testing methods of XRD, SEM, surface hardness were adopted in this method. Consistency, compress strength, chloride permeability, anti-carbonation capability and frost resistance were further studied on concrete with nanomaterials for engineering construction.
The testing results indicated that nano particles filled into the micro porous as nucleator in the cementitious materials accelerate the cement hydration and hardening process. At the same time, the particles also reduced crystal size of hydration products so that the compressive strength was greatly enhanced especially in the early age.
The nano CaCO3 intermediate was used in this study for its relatively low price. The test results indicated that the intermediate was well-dispersed. The early age strength of concrete was greatly enhanced. Compared with other nano material, CaCO3 intermediate has the advantages of economic and well-dispersed, In addition, a nano composite admixtures producing method was proposed. The nano CaCO3 intermediate was used to make the slag powder as carrier of nano-CaCO3 intermediate. Both the early age strength and strength growth were improved with the use of proposed nano composite admixture. The performance, mechanical properties and durability of concrete were all effectively improved with nano composite admixtures.
A new method was proposed to study the mechanism on cement-based materials with nano-CaCO3 intermediate. The cement pastes at early age were immersed into nano-CaCO3 fluid so that the interaction of hydration product of cement could be effectively eliminated.
This study focused on the application of nano-CaCO3 in cement-based materials. The research results are also helpful for the application of other nano particles in engineering.
引文
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