混合材料的粒度分布对水泥性能影响的研究

发布时间：2018-03-04 18:14

本文选题：矿渣　切入点：粉煤灰　出处：《济南大学》2014年硕士论文　论文类型：学位论文

【摘要】：水泥混合材料一般为具有一定潜在水化活性的胶凝性材料，在水泥的水化、硬化过程中，主要表现为改变水泥熟料水化过程，有利于提高硬化浆体的结构致密度，改善水泥性能、从而提高硬化浆体的各龄期强度。水泥生产中掺加混合材料已经成为水泥行业节能减排，发展绿色水泥的重要途径。然而，水泥混合材料的水化活性相对较低，掺入量较大时，会影响水泥的早期强度。另外，混合材料的粉磨细度及其粒度分布对于水泥粉磨电耗及其各龄期强度具有重要的影响，因此，研究和探索混合材料与水泥熟料之间合理的粒度分布匹配对于充分发挥混合材料的潜在水化活性、提高水泥的力学性能及其他性能具有重要的意义。本文选取矿渣、粉煤灰、石灰石三种常用的水泥混合材料，分别粉磨制备了5个不同细度及粒度分布的粉体试样，试验研究了各粉体掺入量对水泥性能的影响，并结合硬化浆体的孔结构特征参数，运用灰色系统理论研究分析了混合材料的粒度分布与水泥各龄期强度之间的关联度与关联极性，以期发现混合材料粒度分布对水泥性能的影响规律，优化混合材料与水泥熟料之间的粒度分布匹配。研究结果表明，三种混合材料的粒度分布显著地影响水泥各龄期强度。粒径＜11μm的颗粒含量为59.33%～77.31%时的矿渣微粉掺入量为30%时，水泥各试样的标准稠度需水量无明显变化；初凝时间、终凝时间缩短30min以上；水泥3d、28d抗折强度提高10%以上，抗压强度提高7%以上。矿渣微粉粒度区间与硬化水泥石抗压强度之间关联度的计算结果表明：0~23μm的矿渣微粉颗粒对水泥3d、28d抗压强度起增进作用；23μm的矿渣微粉颗粒对水泥的3d、28d抗压强度起削弱作用。0~5μm、5~11μm的矿渣微粉颗粒含量分别是矿渣水泥3d、28d抗压强度的最强影响因子。此外，掺入矿渣微粉的矿渣水泥各试样浆体中无害孔、少害孔呈明显增大趋势，多害孔显著降低，，无害孔数量增大6.63%，少害孔数量增大11.01%，多害孔数量减少21.6%。粒径＜10μm的颗粒含量为33.1%~59.3%时的粉煤灰掺入量为10%时，水泥各试样的标准稠度需水量增加约3%以上，初凝时间、终凝时间降低约14%，水泥3d、28d抗折强度提高8%以上，3d、28d抗压强度提高11%以上。通过粉煤灰粒度分布与粉煤灰水泥抗压强度之间的关联度及关联极性计算得到：0~33μm的粉煤灰颗粒含量对水泥3d、28d抗压强度起增进作用；33μm的粉煤灰颗粒含量对水泥3d、28d抗压强度起削弱作用。0~5μm、5~10μm的粉煤灰颗粒含量分别是粉煤灰水泥3d、28d抗压强度的最强影响因子。10%粉煤灰的掺入，使得试样F1~F5水泥浆体的无害孔数量增加12.24%，少害孔数量增加12.11%，有害孔数量减少10.83%，多害孔数量减少13.51%。粒径＜11μm的颗粒含量为51.7%~83.3%时石灰石粉掺入量为5%时，水泥各试样的标准稠度需水量降低约4%，初凝时间、终凝时间降低约15%，水泥的3d、28d抗折强度提高10%以上，3d、28d的抗压强度增长6%以上。关联度计算结果显示：0~23μm的石灰石粉颗粒对水泥3d、28d抗压强度起增进作用，23μm石灰石粉颗粒对水泥的3d、28d抗压强度起削弱作用。5~11μm、0~5μm的石灰石粉颗粒含量分别是石灰石水泥3d、28d抗压强度的最强影响因子。10%磨细石灰石粉的掺入，导致试样S1~S5水泥浆体的无害孔数量减少12.4%，少害孔、有害孔的数量分别增加9.28%、8.14%，多害孔的数量减少4.32%。
[Abstract]:Cement mixed material is generally cementitious material has a certain potential hydration activity, in cement hydration, hardening process, mainly for the change of cement clinker hydration process, help to improve the structure of hardened paste density, improve the performance of cement, so as to improve the strength of all age hardening cement paste. In the production of adding mixed materials has become the energy saving and emission reduction in cement industry is an important way for the development of green cement. However, cement hydration activity is relatively low, the incorporation of a large amount of time, will affect the early strength of cement. In addition, fineness and particle size distribution of mixed material for cement grinding power consumption and the age strength has an important influence, therefore, the research and exploration between the mixed material of cement clinker and reasonable particle size distribution, to give full play to the potential hydration activity of mixed materials, improve the mechanical properties of cement Energy and other performance are of great significance.
This paper selects slag, fly ash, limestone, three kinds of commonly used cement mixed materials, respectively, were prepared by 5 different grinding fineness and particle size distribution of the powder sample, the test study of the influence of mixing amount of powder on the properties of cement, and combined with the characteristics of pore structure of hardened paste parameters, using grey system theory analysis of the correlation degree and correlation between particle size distribution of the cement mixed material and the age strength of polarity, in order to find the influence on the performance of cement mixed material particle size distribution, particle size optimization between mixed materials and cement clinker distribution matching. The results show that the particle size distribution of three kinds of hybrid materials significantly affect cement the strength of every age.
The particle size is less than 11 m particle content is 59.33% ~ 77.31% when the doping amount of slag powder is 30%, the standard consistency of cement samples of water had no obvious change; the initial setting time and the final setting time shorter than 30min; cement 3D, 28d flexural strength increased by more than 10%, the compressive strength increased by more than 7% between slag powder particle size range and compressive strength of hardened cement paste correlation calculation results show that 0~23 m slag powder on cement particles 3D, 28d compressive strength of up to enhance the role of slag particle; 23 m of cement 3D, 28d compressive strength has weakened.0~5 m slag particle content 5~11 M are 3D slag cement, the strongest influence factors of compressive strength of 28d. In addition, harmless pore slag cement slurry samples doped slag powder, less harmful hole was significantly increasing trend, and significantly reduce multi hole, harmless hole number increased 6.63%, less harm The number of holes increased by 11.01%, and the number of multiple damage holes was reduced by 21.6%.
The particle size is less than 10 m particle content is 33.1%~59.3% when the fly-ash amount is 10%, the standard consistency of cement samples of water demand increased about 3% above, the initial setting time and the final setting time is reduced by about 14%, cement 3D, 28d flexural strength increased by more than 8%, 3D, 28d compressive strength increased 11%. Through correlation and correlation between the particle size distribution of fly ash and fly ash cement, the compressive strength of the polarity calculation: fly ash particle content 0~33 m of cement 3D, 28d compressive strength has enhanced; fly ash content of 33 m of cement 3D, 28d compressive strength has weakened the role of.0~5 m, fly ash content of 5~10 m were the fly ash cement 3D, 28d compressive strength of the strongest influence factor of.10% fly ash, the harmless hole specimen of F1~F5 cement paste increases with the number of 12.24%, and a 12.11% increase in the number of small holes, to reduce the number of harmful holes 10.83%, and multi hole Reduce the number of 13.51%.
The particle size is less than 11 m particle content of 51.7%~83.3% limestone powder is mixed with the amount of 5%, the standard consistency of cement samples of water demand reduced by about 4%, the initial setting time and the final setting time is reduced by about 15%, cement 3D, 28d flexural strength increased by more than 10% 3D, the compressive strength of 28d growth 6%. Correlation calculation results show that the 0~23 m of the limestone powder particles of cement 3D, 28d compressive strength has enhanced 23 m limestone particles of cement 3D, 28d compressive strength has weakened the role of.5~11 m, 0~5 m content of limestone particles are limestone cement 3D, 28d the compressive strength of the strongest influence factor of.10% milled limestone powder mixing, resulting in the number of harmless hole specimen of S1~S5 cement paste is reduced by 12.4%, less harm hole, number of harmful holes were increased by 9.28%, 8.14%, the number of holes to reduce 4.32%. damage

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ172.1

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