原料组分及细度匹配对水泥性能的影响研究

发布时间：2018-06-21 13:59

本文选题：细度匹配 + 组分匹配　；参考：《济南大学》2014年硕士论文

【摘要】：我国是水泥生产大国，水泥工业的能源、资源消耗巨大。混合粉磨时水泥粉磨电耗高，由于熟料、混合材的易磨性差异大，造成水泥粒度分布不均匀。水泥粗颗粒中含有许多活性较高的熟料，但是粗粒径熟料的水化程度较低，造成熟料浪费。本文通过分别粉磨方式，将不同细度和组分的熟料、矿粉、低活性混合材相互匹配配制水泥，研究了原料细度匹配对水泥性能的影响，找出合理的细度匹配，并在此基础上研究组分匹配对水泥性能影响。通过颗粒粒度分布、力学性能、凝结时间等宏观检测方法以及水化热、综合热分析、XRD和SEM等微观测试技术，对水泥水化微观分析，得到以下主要研究结果： 1．不同细度的熟料与低活性混合材相互匹配时，细熟料水泥和中熟料水泥随混合材细度增大，标准稠度用水量减小，凝结时间延长，但变化较小。粗熟料水泥随混合材细度增大，标准稠度用水量基本不变，但凝结时间显著延长。细熟料水泥各龄期强度随混合材细度增大明显降低，S1H1K强度最高，S1H2K次之，S1H3K最低。中熟料水泥S2H2K的各龄期强度较高，28d抗压强度与S1H1K相同，1d抗压强度低于S2H1K0.9MPa，3d抗压强度相同，28d、60d抗压强度高于S2H1K0.3MPa、0.5MPa；粗熟料水泥S3H2K的1d、3d抗压强度低于S3H1K0.4MPa、0.3MPa，28d、60d抗压强度高于S3H1K0.6MPa、1.6MPa。说明与中熟料和粗熟料相匹配时，低活性混合材细度为H2时，水泥强度较高。水泥粒度分布合理，水化放热速率和水化热随混合材和熟料的细度增大明显降低；混合材细度增大，水泥水化第三放热峰出现时间明显延迟，水化放热速率显著降低，S2H3K与S2H1K相比，第三放热峰推迟了2h，水化放热速率降低了13.7%。通过综合热分析、XRD、SEM分析等，表明混合材细度增大，细熟料水泥水化产物减少，但对中熟料水泥水化影响较小，，粗熟料水泥由于熟料细度增大，水化速率较慢，所以水化产物明显减少。不同细度匹配的水泥孔隙率均较低且孔结构分布合理。 2．综上可知，中细度熟料和中细度低活性混合材相匹配时（S2H2K），水泥的标准稠度用水量低、凝结时间长且各龄期强度较高，水化放热速率和放热量较低，孔隙率较低，孔结构分布较好，是最合理的细度匹配方案。 3．在最佳细度匹配方案(S2H2K)基础上，研究组分匹配对水泥性能影响。实验表明，随熟料掺量增加，水泥的标准稠度用水量降低，凝结时间缩短，水泥的抗折强度、抗压强度提高。熟料掺量50%的B23d、28d、60d、90d抗压强度分别为19.7MPa、50.1MPa、59.5MPa、60.9MPa；熟料掺量65%的B5的3d、28d、60d、90d抗压强度分别为25.2MPa、60.0MPa、65.6MPa、69.9MPa。即用50%熟料、20%矿粉和30%的低活性混合材，制备28d强度达到50.0MPa的复合硅酸盐水泥，用65%熟料、20%矿粉和15%的低活性混合材，水泥28d强度达到60.0MPa。通过综合热分析、XRD、SEM、压汞测试分析可知，不同组分匹配的水泥水化较好，水泥石结构较为致密，孔结构分布合理。
[Abstract]:China is a big country of cement production. The energy consumption of cement industry is huge. The cement grinding electricity consumption is high when mixed grinding. Due to the clinker, the difference of the grindability of the mixed material is large, the cement granularity distribution is uneven. The cement coarse particles contain a lot of high activity clinker, but the hydration degree of the coarse grained clinker is low, resulting in the waste of the clinker.
In this paper, the cement is prepared by the matching of different fineness and composition of clinker, mineral powder and low active mixture. The effect of fineness matching on the properties of cement is studied, and a reasonable fineness matching is found. On the basis of this, the effect of the components matching on the cement properties is studied. The particle size distribution, mechanical properties and condensation are studied. The following main research results are obtained: macroscopic detection methods such as time, hydrothermal analysis, synthetic thermal analysis, XRD and SEM microcosmic testing techniques.
1. when the fineness of different fineness clinker and low activity mixture is matched, the fine clinker cement and the medium clinker cement increase with the fineness of the mixture, the water consumption of the standard consistency is reduced, the setting time is prolonged, but the change is small. The standard consistency water base of the coarse clinker cement increases with the fineness of the mixture, but the setting time is prolonged. The fine clinker water is prolonged. The strength of each age of mud decreased obviously with the increase of the fineness of the mixture, the strength of S1H1K was the highest, S1H2K was the second, and the S1H3K was the lowest. The strength of the cement S2H2K of the medium clinker was higher, the 28d compressive strength was the same as that of S1H1K, and the 1D compressive strength was lower than S2H1K0.9MPa, and the 3D compressive strength was the same, 28d, 60d compressive strength was higher than that of S2H1K0.3MPa. Compressive strength is lower than S3H1K0.4MPa, 0.3MPa, 28d, 60d is higher than S3H1K0.6MPa, 1.6MPa. shows that when the fineness of low active mixture is H2, the cement strength is higher when the fineness of the medium clinker and coarse clinker is H2, the cement size distribution is reasonable, the hydration heat rate and hydration heat decrease obviously with the fineness of the mixture and clinker, and the fineness of the mixture. In addition, the time of the third exothermic peak of cement hydration third is obviously delayed and the rate of hydration heat release decreases significantly. Compared with S2H1K, the third exothermic peak is delayed by 2H, and the hydration heat rate is reduced by 13.7%. through comprehensive thermal analysis, XRD, SEM analysis and so on, which indicates that the fineness of the mixture increases and the hydration products of the fine clinker cement are reduced, but the hydration of medium clinker cement is hydrated. Because of the smaller influence, the coarse clinker cement, because the fineness of the clinker increases, the hydration rate is slow, so the hydration products obviously decrease. The porosity of the cement with different fineness is lower and the pore structure is reasonable.
2. it is known that when the medium fineness clinker and medium fineness low activity mixture are matched (S2H2K), the standard consistency of cement is low, the setting time is long and the strength of each age is higher, the hydration heat rate and the discharge heat are low, the porosity is low, and the pore structure is well distributed, which is the most reasonable fineness matching scheme.
3. on the basis of the best fineness matching scheme (S2H2K), the effect of the component matching on the cement performance is studied. The experiment shows that with the addition of the clinker, the water consumption of the cement's standard consistency is reduced, the setting time is shortened, the flexural strength and the compressive strength of the cement are increased. The compressive strength of the cement with 50%, 28d, 60d, and 90d is 19.7MPa, 50.1MPa, 59.5MPa, respectively. 60.9MPa; the 3D, 28d, 60d, 90d compressive strength of the clinker with 65% B5, 25.2MPa, 60.0MPa, 65.6MPa, 69.9MPa., respectively, using 50% clinker, 20% mineral powder and 30% low active mixture to prepare the composite Portland cement with 28d strength to meet 50.0MPa, with 65% clinker, 20% mineral powder and 15% low active mixture. The thermal analysis, XRD, SEM and mercury intrusion test showed that the cement with different components matched well, the structure of cement paste was compact, and the pore structure distribution was reasonable.
【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

【参考文献】