大雁塔和法门寺砖材保护研究

大雁塔和法门寺塔这两座佛教名塔都表现出明显的风化现象 ,需要及时的给于保护。通过X射线衍射分析、岩相显微镜分析及孔隙度的测定 ,分析了大雁塔和法门寺两座佛教名塔的风化特征。在此基础上 ,用几种不同的加固保护剂对两种砖材进行加固保护研究。通过渗透深度、孔隙度、毛细吸水和毛细渗透、持水量、透气性、水力学膨胀、等温吸附、抗压强度及酸腐蚀、冻融、热膨胀之后的强度衰减等参数分析 ,结果表明含氟聚合物对两种砖材具有良好的加固保护效果。

Controlled low-strength material incorporating recycled fine aggregate from urban red brick based construction waste

Sixteen controlled low-strength material( CLSM)mixtures with various cement-to-sand( C/Sa) ratios and water-to-solid( W/So) ratios were prepared using recycled fine aggregate from urban red brick based construction waste.The fluidity and bleeding of the fresh CLSM mixtures were measured via the modified test methods, and the hardened CLSM mixtures were then molded to evaluate their compressive strength and durability. The results showthat the fluidity of the fresh CLSM mixtures is 105 to 227 mm with the corresponding bleeding rate of 3. 7% to 15. 5%, which increases with the increase in fluidity. After aging for 28 d,the compressive strength of the hardened CLSM mixtures reaches 1. 15 to 13. 96 M Pa, and their strength can be further enhanced with longer curing ages. Additionally, the strength increases with the increase of the C/Sa ratio, and decreases with the increase of the W/So ratio under the same curing age. Based on the obtained compressive strength, a fitting model for accurately predicting the compressive strength of the CLSM mixtures was established, which takes into account the above two independent variables( C/Sa and W/So ratios).M oreover, the durability of the hardened CLSM mixtures is enhanced for samples with higher C/Sa ratios.

自来水厂铝污泥制备吸磷砖的技术方法研究

铝污泥是自来水厂净水过程中的副产物，大部分脱水铝污泥被视为废弃物而被填埋处置，造成资源的极大浪费。基于铝污泥的理化性质和较强吸附能力，以西安市曲江水厂铝污泥为基础材料，将脱水铝污泥经300—1000℃不同高温预处理，最终获得了一种对水中磷污染物具有良好吸附性能的颗粒新材料。利用该新材料，分别添加水泥、黄土和粉煤灰，试制了具有吸附磷污染物功能的建筑砖材，得到了最佳配比。这为合理利用自来水厂铝污泥提供了一种可行的方法。