煤矸石-水泥二元胶凝材料水化动力学研究

为揭示煤矸石对水泥水化过程的影响,采用等温量热仪研究了煅烧煤矸石-水泥复合胶凝体系的水化动力学。煤矸石-水泥二元胶凝材料水化放热规律与纯水泥基本一致;复合盐(CaCl2—K2SO4,CaCO3—K2SO4)能够促进煤矸石-水泥胶凝材料的水化,缩短煤矸石-水泥胶凝材料的水化诱导期,提高煤矸石-水泥的水化放热量;从加速期水化反应速率常数和水化放热量来看,氯盐-硫酸盐比碳酸盐-硫酸盐对煤矸石-水泥二元胶凝材料激发效果更好。     

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。     

钢渣化学活性组分的提取与胶凝活性评价研究

不同来源转炉钢渣之间的胶凝活性差异较大,为研究开发出对其胶凝活性进行快速评价的方法,采用蒸发-冷凝法对不同来源钢渣中的化学活性组分进行了快速溶出提取试验,研究了其溶出特性与溶出机理,结合钢渣胶凝材料胶砂试验,系统分析了钢渣溶出特性与胶凝材料强度性能之间的关系。研究结果表明,各钢渣化学活性组分的溶出量差异显著,溶出过程符合由固膜扩散控制的收缩未反应核模型特征。钢渣的溶出特性与钢渣胶凝性能之间存在显著的线性关系,利用(CaO+Al2O3)溶出量等评价指标可快速地对不同来源钢渣的胶凝活性作出比较准确的评价。     

煅烧贝壳的石灰活性评价及工艺优化

目的通过煅烧使贝壳的主成分CaCO3分解，生成活性较高的CaO为主体的胶凝材料，方法用石灰活性度的方法测试评价其活性度．以活性度为考核指标，通过正交设计优化了贝壳初始破碎粒度、煅烧温度和煅烧时间等工艺参数．结果在所有因素中，贝壳粉的粒度影响最大，煅烧温度也是显著影响其活性度的重要因素，煅烧时间对活性度有影响．结论优化确认的工艺条件经复演试验，获得了大于350ml的高活性度，根据活性度的判据，该工艺参数下其生烧和过烧的含量都在2％以下，其煅烧贝壳的活性完全可作为胶凝材料应用于建筑工程中．     

一类新型胶凝材料及其组成设计

本文从材料设计的基本观点出发，对一类新型胶凝材料从组份的确定，到组成的设计进行了大量的工作，重点介绍了这类胶凝材料设计的基本思想，以及胶凝材料最佳组成范围和胶凝材料的力学性能。     

玻璃粉胶凝活性研究

用对比强度法和石灰吸收试验研究了玻璃粉的胶凝活性。结果显示,掺玻璃粉胶砂7 d强度较低,但掺量在20%以下时,28 d和56 d活性指数均在80%以上。玻璃粉对56 d胶砂抗折强度有明显改善作用,随掺量增加,抗折强度增大。玻璃粉加入Ca(OH)_2饱和溶液和水泥养护溶液中,溶液pH值随龄延长不断下降,有较高的火山灰反应活性。     

钢渣粉品质与胶凝活性灰关联分析及预测模型

为了探索钢渣粉品质与胶凝活性之间的关系,采集了6种分布于中国不同区域的钢渣,通过化学分析与X射线衍射(XRD)分析其化学组成与矿物组成,依据《用于水泥和混凝土中的钢渣粉》(GB/T 20491—2006)进行胶凝活性试验,借助灰色系统理论分析了钢渣粉组成对其胶凝活性的影响,并建立了28d抗压强度预测模型。结果表明:适当提高CaO,MgO,SO3的质量分数均有利于提高钢渣粉的胶凝活性;与钢渣碱度系数相比,钢渣中(CaO+MgO)/(Fe2O3+SiO2)值与胶凝活性的关联度更高(达0.94以上),其值在一定程度上反映了钢渣粉胶凝活性的大小;据此建立了其与砂浆28d抗压强度的GM(1,2)预测模型,预测值与实测值吻合较好,平均相对误差3%。     

α-TCP/TECP双相磷酸钙的胶凝特性研究

主要研究了α-Ca3(PO4)2-Ca4(PO4)2O体系胶凝材料的凝结硬化及强度性质.研究表明,在实验条件下,该体系胶凝材料的凝固时间随粉料中TECP质量分数的增加而缩短.硬化体24h抗压强度与TECP质量分数的关系呈凸型曲线关系.当TECP质量分数为20%时,抗压强度最大为37.6MPa.此外,阐述了硬化体的XRD分析和SEM观察.     

硫氧镁胶凝材料性能与研究

硫氧镁胶凝材料以轻烧镁、硫酸镁为主要成份的无机胶凝材料,通过加入硼酸、柠檬酸等辅助材料,经正交设计实验优化镁质胶凝材料的配合比,结合胶凝材料的显微结构分析等检测手段,取得性能较好的镁质胶凝材料,为新型镁质胶凝材料推广应用起到一定的促进作用．     

Structure and pozzolanic activity of calcined coal gangue during the process of mechanical activation

On the basis of analyzing coal gangue’s chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by XRD, FTIR, NMR, and the mechanical strength of the cement doped coal gangue with various specific surface area was tested. The experimental results indicate that, the lattice structure of metakaolin in coal gangue samples calcined at 700 °C disorganizes gradually and becomes disordered, and the lattice structure of α-quartz is distorted slightly. The pozzolanic activity of the coal gangue increases obviously with its structural disorganization. Funded by the Key Laboratory Foundation of Ecological-Environment Materials (Yancheng Institute of Technology) of Jiangsu Province (XKY2006020), and the Natural Science Foundation of Jiangsu Provincial Education Department(07KJB430123)     

Activity and Structure of Calcined Coal Gangue

Coal gangue was activated by means of calcination in seven temperature ranges. Systematic research was made about activation mechanism and structural evolution. Glycerin-ethanol method, SEM, M1P and XRD were used to determine the variation of structure and activation of coal gangue during the calcination. The experimental results show that because of heat treatment in the range of calcination temperature, mineral composition and microstructure of coal gangue are changed. In addition, its activity is improved evidently. The amount of lime absorbed by the sample calcined at 700 ℃ is 2-4 times that by uncalcined coal gangue in the course of hydration. When NaOH is added to coal gangue-lime system, hydration reaction of the system is sped up and the microstructure of hydrating samples of coal gangue is improved.     

Pozzolanic Activity of Burned Coal Gangue and Its Effects on Structure of Cement Mortar

The pozzolanic activity of coal gangue burned at different burning temperatures was investigated. The burned coal gangue was mixed with portland cement in different proportions （ 20% - 60% ）. The pozzolanic activity of coal gangue burned and the hydration products were examined, the compressive strengths of the pastes of the mixtures were tested, and the mechanism of the reaction was discussed. The experimental results slum, that the coal gangue burned at 750 ℃ has the optimum pozzolanic activity, and the burned coal ganguc with SiO2 and Al2 O3 is in an active form. When the coal gangue burned at 750℃ is mixed into portland cement, the content of calcium hydroxide in paste is significantly reduced, while the contents of hydrated calcium silk.ate and hydrated calcium aluminate are increased accordingly, hence resulting in the improvement of the microstructure of mortar. The compressive strength of cement paste decreases with increasing the content of burncd coal gangue. The decease in strength is small in the range of 20% - 30% coal gangue substitution and significant in 30%- 60% substitution.     

Microstructure and cementitious properties of calcined clay-containing gangue

To investigate the optimum calcination temperature and cementitious properties of gangue, the microstructure of clay-containing gangue calcined at different temperatures was analyzed by X-ray diffraction (XRD), infrared spectroscopy (IR), and magnetic angle spinning nuclear magnetic resonance (MAS NMR). The results show that the structure of kaolinite in the gangue sample calcined at 500°C is destroyed. The XRD spectra show the disappearance of illite at about 800°C and the formation of mullite at about 100...     

煤矸石砼中钢筋粘结锚固的试验研究

在文献[2]的基础上，对煤矸石砼的粘结应力分布，箍筋及煤矸石砼保护层对粘结应力的影响进行了与普通砼的对比试验，进一步研究砼保护层厚度及钢筋锚固长度对粘结强度的影响，给出了保护层与粘结应力、砼强度与临界锚长的经验公式。     

镁渣火山灰活性试验研究

通过对镁渣的化学组成、水泥胶砂强度试验和微观结构分析,研究了镁渣的火山灰活性、细磨加工效应和与粉煤灰的复合效应机理,旨在从力学效应方面分析镁渣作为砂浆和混凝土掺合料的可行性.结果表明,镁渣具有一定的火山灰活性,细磨加工能提高镁渣活性,在渣灰比≤60%时,镁渣与粉煤灰的复合效应显著.     

Performance of cemented coal gangue backfill

Possibility of cemented gangue backfill was studied with gangue of Suncun Coal Mine, Xinwen Coal Group, Shandong, and fly ash of nearby thermal power plant, in order to treat enormous coal gangue on a large scale and to recovery safety coal pillars. The results indicate that coal gangue is not an ideal aggregate for pipeline gravity flow backfill, but such disadvantages of gangue as bad fluidity and serious pipe wear can be overcome by addition of fly ash. It is approved that quality indexes such as strength and dewatering ratio and piping feature of slurry can satisfy requirement of cemented backfill if mass ratio of cement to fly ash to gangue is 1：4：15 and mass fraction of solid materials reaches 72%-75%. Harden mechanism suggests that the cemented gangue fill has a higher middle and long term comprehensive strength.     

煤矸石在公路工程中的应用试验研究

煤矸石是一种原煤废料 ,对环境污染严重 ,用于公路建设是一种有利的尝试。本文通过煤矸石填料在公路工程路基、底基层的应用试验与实践 ,阐述了煤矸石施工工艺和质量控制要点 ,并讨论了特殊路基和桥头路基的处理工艺 ,以期为我国公路工程施工提供一种新的建筑材料。     

利用燃烧煤矸石渣配制混凝土路面砖的试验研究

利用燃烧后的煤矸石渣作骨料 ,配制混凝土路面砖。通过正交试验确定出影响路面砖强度的主要因素及路面砖的最佳配比。     

Dissolution properties of calcined gangue

To study the dissolution mechanism of gangue, dissolution characteristics of the gangue samples calcined at different temperatures in alkaline solutions and alkali metal silicate solutions with respect to Si and Al ions were analyzed by identical coupled plasma optical emission spectroscopy （ICP）. The results show that the extent of dissolution of Al and Si varies with calcination temperature. It shows that the samples have a higher degree of dissolution in NaOH than in KOH medium. Si and Al appear to have synchro-dissolution behavior in alkaline solution, which means that Si and Al could dissolve from the mineral surface in certain linked forms. The result that a higher degree of dissolution exists in sodium silicate solution and a lower degree of dissolution exists in sodium-potassium silicate solution of Al is proved by the 29Si NMR spectra and the mean connectivity degree of these alkali metal silicate solutions.