利用煤矸石与页岩制备无熟料胶凝材料的研究

研究了煤矸石、页岩复掺并激活后替代水泥熟料生产胶凝材料的可行性;利用XRD和X射线衍射分析等检测手段对煤矸石和页岩的矿物组成及化学成分进行了分析,运用DTA分析确定了煤矸石和页岩的最佳煅烧温度范围,并结合活性评价方法确定了最佳的煅烧工艺;采用脱硫石膏和CaO作为活性激发剂,结合胶砂强度对制备出的胶凝材料的宏观性能进行了分析,并利用SEM对其水化产物进行了系统的分析且探讨了其相关反应机理。结果表明,在实验中,当煤矸石与页岩的比例为7∶3且内掺5%脱硫石膏时,在780℃温度下保温2h且在空气中进行急冷的条件下,得到的煅烧样的活性最佳,且利用其制备出的胶凝材料的3d、28d胶砂强度均可达PC32.5强度等级。     

激光辐射探测器特性测试研究

本文介绍一种以稳定的He-Ne激光器、CW-YAG激光器和CO_2激光器为测试光源的激光探测器特性测试装置,用来评价激光探测器的参数质量。     

高铝水泥对改善磷石膏基水泥早期性能的试验研究

研究了在磷石膏基水泥中掺入少量的高铝水泥对该水泥性能的影响,并通过XRD和SEM分析探讨了该水泥体系的水化机理。研究结果表明,高铝水泥可以显著改善磷石膏基水泥的凝结时间和早期强度;当掺入6%的高铝水泥时,水泥的初凝时间和终凝时间分别减小了4h和5h左右,同时水泥的早期强度提高了11%左右,而后期强度变化不大。     

Effects of clinker contents of different C3A and C4AF on the performance of PSC cement

Phosphogypsum-slag-clink (PSC) cement were prepared by original phosphogypsum(PG), which was grinded after dried at 60 °C combined with different contents of phosphogypsum (15%, 20%, 30%), and a small amount of different C₃A, C₄AF contents of finely ground cement clinker, and ground granulated blast furnace slag (GGBFS). Physical mechanical and sugaring properties were studied. The results show that compressive strength of PSC cement with 20% phosphogypsum at 3 d ages would be higher than 17 MPa and even 50 MPa at 28 days. Compressive strength at longer curing stage and sugaring properties of PSC with lower content of C₃A higher C₄AF clinker were improved. pH value of PSC cement system at early stage was relatively low, and pH gradually increased with the addition of clinker. pH increased firstly and then decreased with the hydration stage. SEM analyses showed that the amount of ettringite, which was influenced by pH and content of Al, must be controlled in PSC cement system, which may cause damage to microstructure or even expansive cracks if large amount of ettringite formed in hardened paste.     

减胶剂对水泥混凝土性能及胶凝材料水化作用的影响

通过掺与不掺减胶剂对胶凝材料体系的影响试验,研究了减胶剂对混凝土工作性、强度及耐久性的影响,探明了减胶剂对胶凝材料早期电阻率及水化产物的影响和对不同原材料所配制胶砂的激发效果.结果 表明:掺入0.5％的减胶剂能显著提高混凝土的28 d强度和混凝土的抗碳化性能、抗渗性能,降低混凝土的电通量.在达到相同的混凝土性能标准下,掺加减胶剂能降低混凝土胶凝材料的用量,提高混凝土的经济性;减胶剂除具有分散性外,还能有效激发粉煤灰效果,使水泥早期水化电阻率降低,溶出更多的离子并生成更多的碳铝酸钙等水化产物,进而提高混凝土的各项性能.