【作者】 王浩；

【导师】 易龙生；

【作者基本信息】 中南大学 ， 矿业工程， 2012， 硕士

【摘要】 在水泥生产过程中最大程度利用人类社会活动中排出的工业废渣(如粉煤灰、矿渣、赤泥、尾矿等),制备高性能水泥制品,越来越引发关注。但已有相关研究和实践证明：水泥生产过程中,掺加工业废渣尤其是工业废渣掺量较大时,会带来如早期强度较低、对养护环境敏感、抗冻性下降、自收缩较大、碳化速度加快等负面影响。这些实际问题迫使研究人员加深对水泥-工业废渣体系的水化过程及机理、水化产物的数量、组成及类别的系统研究,消除工业废渣对水泥基材料性能的负效应,扬长避短、合理应用工业废渣。本文重点研究了粉煤灰-水泥这一胶凝体系,详细探讨了粉煤灰掺量、水胶比、养护温度和化学激发对其力学性质、水化产物非蒸发水含量及粉煤灰反应程度的影响。结果显示：(1)粉煤灰掺量是影响粉煤灰-水泥体系胶凝活性的主要因素,粉煤灰掺量越大,粉煤灰-水泥抗压强度越小,非蒸发水含量越少,粉煤灰反应程度越低。(2)水胶比明显影响粉煤灰-水泥的抗压强度大小,最佳水胶比为0.4.(3)提高养护温度有利于增大胶砂抗压强度,提高净浆非蒸发水含量及粉煤灰反应程度。(4)氢氧化钠和硫酸钠的复合激发效果最好,40%粉煤灰掺量的胶砂1d,3d,7d抗压强度最高分别可达到12.57MPa,16.48MPa,22.96MPa(氢氧化钠和硫酸钠掺量为1%)。80%粉煤灰掺量的胶砂1d,3d,7d抗压强度最高分别可达到4.86MPa,8.2MPa,10.87MPa(氢氧化钠和硫酸钠掺量为1%)。更多还原

【Abstract】 High degree utilizing industrial solid waste such as fly ash, slag, red mud and gangue in cement industry to make high performance cement products is attended by more and more people.But the existent reaserches and practice have proved that cement with high degree industrial solid waste is more sensitive to maintenance environment and has lower frost-resistance, larger self-constriction,quicker carbonization, especially when the content is large. These practical problems compel researchers to study the hydration and mechanism of cement-industrial solid waste system comprehensively, as well as the amount, composition and types of hydration product.So we can make reasonable application of the industrial waste if the shortcomings are eliminated.This paper focus on the fly ash-cement system and discusses the influence of fly ash dosage,water to binder ratio,curing temperature, chemi-excitation on mechanical property, non-evaporable water content and fly ash reaction degree detailedly. Experiment results show that:(1) The fly ash dosage is a main factor for fly ash-cement activity, If adding more fly ash, the compressive strength will be smaller, the non-evaporable water content will be less, and the fly ash reaction degree will be lower.(2) Water to binder ratio has obvious influence on the compressive strength of fly ash-cement,the best ratio is0.4.(3) Increasing the curing temperature can improve the compressive strength and aggrandize non-evaporable water content and the reaction degree of fly ash.(4) Sodium hydroxide and sodium sulfate has the best activation effect. When the fly ash dosage is40%,the highest compressive strength in ld,3d,and7d can respectively reach12.57MPa,16.48MPa and22.96MPa (the dosage of sodium hydroxide and sodium sulfate is1%).When the fly ash dosage is80%,the highest compressive strength in1d,3d,and7d can respectively reach4.86MPa,8.2MPa and10.87MPa (the dosage of sodium hydroxide and sodium sulfate is1%).更多还原