天然浮石胶粉混凝土在寒旱区水工建筑物的适应性研究

Subject to the actual geography and climate of the loop irrigation environment as the foundation, study of natural rubber pumice concrete frost resistance of the improvement mechanism, and the view of the cold regions special geographical climate adaptability. Use of Inner Mongolia region of enrichment pumice resources, through the scrap tire rubber powder modified pumice concrete antifreeze, anti-permeability, impact resistant wear-resisting performance etc. Through the analysis of indoor and outdoor and microscopic quantitative expression of the interface, and concludes that the natural pumice light weight aggregate concrete micro powder interface properties, the pore characteristic and the macroscopic mechanical properties (bending, compressive, tensile, anti-permeability, antifreeze and resistance to abrasion resistance) the inner relationship between the, this paper summarizes the mesoscopic change and powder concrete macroscopic mechanical properties of the coupling law; Through the observation of the natural experiment data gate and set up a corresponding temperature gradient ice-brake body shock model; Through the three temperature of freeze-thaw cycle simulation test to freeze, the freezing and ice water impact before and after the cement hydration products structure form, transition zone interface, it is concluded that the cement base material internal composition change, powder-water slurry-aggregate interface transition zone geometry physical properties characterization and pore structure change rule.

课题以河套灌区实际地理气候环境为基础，研究胶粉对天然浮石混凝土抗冻性的改善机理，以及针对寒区特殊地理气候环境下的适应能力。利用内蒙古地区富集的浮石资源，通过废旧轮胎橡胶粉改性浮石混凝土的抗冻、抗渗、抗冲击耐磨等性能。通过室内外实验分析及微观界面的定量化表达，得出天然浮石轻骨料胶粉混凝土微观界面性能，孔隙特征与宏观力学性能(抗折、抗压、抗拉、抗渗、抗冻和抗耐磨性)之间的内在联系,总结胶粉混凝土细观变化与宏观力学性能的耦合规律；通过天生河口闸观测实验数据，建立相应温度梯度下冰凌-闸体冲击模型；通过三温冻融循环试验机对仿真冻结，研究冻结及冰水冲击前后的水泥水化产物结构形态、界面过渡区，得出水泥基材料的内部成分变化、胶粉-水泥浆体-骨料界面过渡区几何物理特性表征及孔结构的变化规律。

本项目内蒙古河套灌区地理气候环境为背景，针对废旧轮胎橡胶粉，将不同掺量和不同粒径的胶粉掺入水泥胶砂中，并逐一进行单掺试验, 确定每种掺量和粒径对水泥胶砂的影响。探究橡胶胶粉对水泥胶粉的力学性能的影响。根据其研究结果，调整天然浮石混凝土的配合比，制备不同胶粉掺量及不同胶粉粒径的配合比的试样，进行宏观力学性能的研究，寻找适合内蒙古天然浮石骨料的胶粉最佳掺量和最佳粒径。筛选出多种不同的掺量和粒径的胶粉混凝土，通过基本力学性能试验、电子显微镜扫描及X射线衍射等试验手段，着重探讨胶粉对轻骨料混凝土的影响机理。. 为了解决胶粉的掺入对水泥胶砂和混凝土力学性能的降低这种情况，分别采取不同化学试剂对废旧轮胎胶粉进行表面改性，利用扫描显微镜（SEM）、傅里叶红外光谱仪（FTIR）、液-固界面视频接触角分析仪以及粒形粒度分析仪对改性前后的胶粉颗粒进行微观表征特征研究。根据多种掺量和粒径的改性胶粉根据不同试验配合比进行水泥胶砂和轻骨料混凝土的配制，利用力学性能测试和微观结构分析改性胶粉对轻骨料混凝土的影响机理。. 针对内蒙古的气候环境，利用“快冻法”对改性胶粉轻骨料混凝土进行抗冻耐久性分析，对质量损伤、相对动弹模量、孔隙变化率进行对比分析，探讨改性胶粉轻骨料混凝的冻融机理。本项目相关研究成果可以为内蒙古河套灌区的水工建筑物建设提供一定的理论基础。