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土聚水泥制备的探索试验与研究 总被引:11,自引:0,他引:11
土聚水泥是一种新型的化学激发胶凝材料,其制备工艺和原材料以及水化硬化机理等都完全不同于普通硅酸盐水泥,性能及应用领域也远比普通硅酸盐水泥优越,是一种在某些工程领域有望取代硅酸盐水泥的极有发展潜力的化学激发胶凝材料。本文在评述国外现有研究成果的基础上熏通过实验室试验探索研究了制备土聚水泥中若干因素的影响作用。 相似文献
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制备土聚水泥中若干因素的影响 总被引:17,自引:1,他引:17
作为一种新型胶凝材料,土聚水泥的制备和水化机理完全不同于普通硅酸盐水泥,其性能及应用领域也远比普通硅酸盐水泥优越,是一种有望取代硅酸盐水泥的极有发展潜力的胶凝材料,文章在评述国外现有研究成果的基础上,通过试验研究了制备土聚水泥中若干因素的影响。 相似文献
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本文阐述了采用正交试验原理对河南大安玄武岩、粉煤灰、矿渣、碱性激发剂和减水剂制做碱激发胶凝材料的试验过程.对该类胶凝材料的力学性能、养护条件、耐酸、耐碱、耐盐性能、抗冻性和吸水率分别进行了测试,并与42.5#普通硅酸盐水泥的性能进行了对比,发现其制品较42.5#普通硅酸盐水泥有较高的力学性能、良好的耐酸碱盐性和耐水性,但其抗冻性能有待进一步研究;X射线衍射微观分析表明:在Al2O3-SiO2和C-S-H、C2-S-H的系统中,莫来石和原料中的石英、方解石起到了骨架的作用,莫来石与C-S-H、C2-S-H一起共同决定了玄武岩-粉煤灰-矿渣碱激发胶凝材料属性,其结构体决定了该胶凝材料的物理力学和化学性能. 相似文献
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激发剂对土聚水泥力学性能影响的研究 总被引:3,自引:0,他引:3
在评述国内外现有研究成果的基础上,通过正交设计方法试验研究不同激发剂种类、掺量对土聚水泥力学性能的影响。试验结果表明:水玻璃碱激发剂对土聚水泥抗压强度的影响效果最好,碱激发剂的强激发作用使土聚水泥产生较高的抗压强度;三乙醇胺对土聚水泥抗压强度的较好影响主要表现在早期,三乙醇胺作为混凝土早强剂,虽然对水泥系统的影响明显,但对本系统的影响不显著;聚丙烯酸钠对土聚水泥抗压强度的影响效果不佳,其原因可能是:大分子量的聚丙烯酸钠由于黏度过高,将偏高岭土颗粒包裹,使其无法与碱激发剂接触,影响了碱激发剂的激发效果。 相似文献
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Fernando Pacheco-Torgal João Castro-Gomes Said Jalali 《Cement and Concrete Research》2007,37(6):933-941
Geopolymeric binders appear to be an alternative to traditional Portland cement, due to high mechanical performances and environmental advantages. Some aspects related to the effect of aggregates in the microstructure and mechanical behaviour of geopolymeric mine waste mud (GMWM) binders are reported in the present study. Compressive and tensile strength of mine waste mud binders were analyzed. The factors investigated were the aggregate/binder ratio, the aggregate dimension and aggregate type, schist, granite and limestone.Test results showed that GMWM binders have a very high strength at early ages and also possess a very high tensile strength. It's suggested that behaviour may be due to the dissolution of quartz and alumina in the presence of alkalis enhancing bonding between paste and aggregates.The aggregate dimension showed only significant effect on tensile strength. Limestone aggregates showed a chemical bond to the alkali-activated paste but presented higher shrinkage. It was also found that no traditional porous ITZ was detected in GMWM binders. 相似文献
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Geopolymeric material is a new type of cement that is synthesized through the alkali activation of aluminosilicates. To improve the properties of the aluminosilicates, the composition is greatly modified. However, through numerous possible synthetic routes to form geopolymers, the determination that the final material has a geopolymer network cannot be ensured, despite the apparent or partial consolidation of material. This work proposes a definition that a domain in the geopolymeric material exists that can be correlated using different techniques to quantify the amount of silicon, potassium and aluminum. Two sources of potassium silicate and various clays with different degrees of amorphous character were compared to determine the importance of the starting materials. The existence domain is an important tool to determine if the synthesized material is a geopolymer network independent of the raw materials used. 相似文献
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Rainy Gupta Pooja Bhardwaj Deepti Mishra Murari Prasad S. S. Amritphale 《Journal of Inorganic and Organometallic Polymers and Materials》2017,27(2):385-398
In this research, advanced hybrid inorganic–organic geopolymeric material is developed by environmentally and user friendlier approach. The presented novel approach for geopolymer formation certainly overcomes the existing drawbacks of geopolymerization technology. The effect of rice husk ash and Na2O/SiO2 ratios on geopolymer gel formation and mechanical strength has been previously identified via solution chemistry route; however, development of geopolymeric material having hybrid inorganic–organic characters via together mechanochemical grinding of raw materials and effect of mechanochemically activated Na2SiO3 on geopolymeric properties via solid state route has never before been explored. Together mechanochemical grinding of raw materials of varying compositions in solid state resulted in the formation of ready to use geopolymeric precursors; which on just addition of water led to development of advanced hybrid inorganic–organic geopolymeric material with considerably enhanced properties. XRD, FTIR and SEM characterization data of developed geopolymeric precursor powder and hybrid inorganic–organic geopolymeric material are reported and discussed in detail. As the results of the investigations, the relationship between geopolymer composition, grinding mechanism and material properties established. The composition which exhibited synergistic effect of both rice husk and SMS is found to be excellent in performance. The study showed that it is practical and better to adopt this greener solid state approach for preparation of geopolymer instead of user-unfriendlier hazardous alkaline solution based approach, to achieve sustainable growth in geopolymers as like Portland cement. 相似文献
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Waste stabilization/solidification of an electric arc furnace dust using fly ash-based geopolymers 总被引:2,自引:0,他引:2
The stabilization/solidification (S/S) of a carbon steel electric arc furnace (EAF) dust containing hazardous metals such as Pb, Cd, Cr or Zn using geopolymerization technology is described in this paper. Different reagents such as sodium hydroxide, potassium hydroxide, sodium silicate, potassium silicate, kaolinite, metakaolinite and blast furnace slag have been used. Mixtures of EAF waste with these geopolymeric materials and class F fly ash have been processed for studying the potential of geopolymers as waste immobilizing agents. Compressive strength tests and leaching tests for determining the efficiency of heavy metal immobilisation have been carried out. Comparison of fly ash-based geopolymer systems with classic Portland cement stabilization methods has also been accomplished. Compressive strength values far better than those achieved by hydraulic S/S methods were easily obtained by geopolymer solids at 28 days. Regarding leachability, the geopolymer S/S solids also manifested in general a better behaviour, showing very promising results. 相似文献