苛性白云石与菱苦土复合的胶凝材料

在小型试验的基础上,对用白云石为原料煅烧加工成苛性白云石镁质胶凝材料进行了半工业试验,试验证明在苛性白云石镁质胶凝材料中加入一定数量的菱苦土所构成的复合型镁质胶凝材料,其标准稠度的净浆抗析、抗压强度等可达到和超过原国家物资局对镁质胶凝材料的有关标准要求,用这种复合型镁质胶凝材料生产某些建筑型材料是可行的,为开发利用丰富的白云石矿产资源提供了可行的依据。     

低品级菱镁矿制耐水氯氧镁胶凝材料的研制

用粉煤灰、磷酸、硫酸铝、有机硅防水剂以及活性氧化镁含量为34．91％的低品级轻烧氧化镁研制出一种耐水氯氧镁胶凝材料,并对镁质材料的强度、耐水性能进行了测试。通过分析粉晶X RD衍射图样和断面微观结构对镁质材料的耐水机理进行了研究。研究结果表明改性过的镁质材料具有优良的耐水性能,其28d软化系数从0．76提高到了1．01。该方法充分利用了低品级菱镁矿资源,为镁质胶凝材料的制备提供了新思路。     

复合型镁质胶凝材料的水化相及其硬化体显微结构

将菱苦土与苛性白云石按一定比例混合构成复合型镁质胶凝材料,将其与氯化镁水溶液按n（MgO）/n（MgCl2）=5拌和后形成氯氧镁水泥硬化体,研究了该复合型镁质胶凝材料的水化相及其硬化体显微结构。该硬化体的强度随着菱苦土在苛性白云石中含量的增加,其不同养护时间的抗折和抗压强度均随之增加,24 h的最高抗折强度为9.07 MPa,28 d的最高抗压强度为183.50 MPa,说明将复合型镁质胶凝材料与氯化镁溶液拌和后,形成了具有一定强度的水泥石或氯氧镁水泥硬化体。XRD和IR测试结果证明形成的硬化体为5型相结晶体,其显微特征主要是大量的凝胶体形貌而非针（棒）状结晶结构,呈放射状的针（棒）状晶体仅在孔洞中存在。认为凝胶体是复合型镁质胶凝材料硬化体具有很高强度的来源。     

利用镁渣配制胶凝材料的机理分析

笔者概述了镁渣的特性、化学成分及矿物组成,分析了镁渣作为胶凝材料的可行性．根据碱矿渣理论利用激发剂激发镁渣的潜在活性,进一步论述了碱激发镁渣的机理,并提出了利用镁渣配制胶凝材料的可行性方法．     

白云石热分解过程及影响因素的研究

采用ＤＴＡ－ＴＧ、ＸＲＤ、化学分析等测试手段，研究了天然白云石在不同升温速率、煅烧温度、恒温时间、初始粒度等条件下的热分解过程及其变化规律，并根据实验结果提出了煅烧白云石制取镁质胶凝材料的合理工艺及参数。     

镁渣等工业废渣应用现状的研究及前景分析

镁渣矿物属于介稳的高温型结构,结构中存在活性的阳离子,所以,镁渣本身具有很高的水化活性,水化后生成水化硅酸钙凝胶,镁渣作为破胶凝材料是可行的,镁渣中的[SiO4]4-更易丢失,链断裂,形成类似于有机-无机杂化物的结构,在镁渣中掺入一定的硅酸盐水泥或磨细硅酸盐水泥熟料和磨细矿渣,以提高镁渣胶凝材料的耐久性,镁渣作为砂浆的胶结材料是非常理想的,镁渣不但可以提高砂浆的和易性,而且还可以提高砂浆的强度和耐久性,镁渣中掺入一定量的轻骨料,可制作轻质保温墙体材料或制成屋面材料。     

高性能胶凝材料中石膏的优化

高性能胶凝材料主要用于高性能混凝土,具有强度高、需水量小、水化垫低和收缩小等特点。按掺高效减水剂的胶凝材料的流变性能来优化石膏的掺量是高性能胶凝材料的特有技术之一。试验研究了石膏的掺量对高性能胶凝材料的需水量、凝结时间、强度、收缩性的影响,以此作为优化石膏掺量的依据。     

利用炼铁高炉渣制备胶凝材料的研究

以高炉渣微粉和偏高岭土为主要原料,NaOH和Na2SiO3为复合激发剂,制备了碱激发矿渣胶凝材料,研究了炉渣粒度、碱添加量及养护制度对矿渣胶凝材料性能的影响.结果表明,炉渣粉磨至10 μm,在室温下养护,激发剂含量为12%时,样品的1 d抗压强度为17.66 MPa;当碱激发剂含量达到16%时,样品的1 d抗压强度为27.91 MPa;随着养护时间的延长,胶凝材料的抗压强度有提高的趋势,80 ℃养护可以提高胶凝材料的早期强度,但养护温度不宜过高.     

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。     

新型放射性废物固化胶凝材料的研究

研究了新型放射性废物固化胶凝材料－富铝碱矿渣粘土矿物的胶凝材料（ＲＡＡＡＳＣＭ）的组成及其浆体的某些性能。结果表明,热活化高岭土、新疆沸石、改性凹凸棒粘土是富铝碱矿渣粘土矿物胶凝材料较好的组成材料。该胶凝材料浆体具有高强、较低孔隙率、较少的有害孔、抗硫酸盐侵蚀和耐辐照性能好的特点。以此材料为基材的模拟放射性废物固化体Ｓｒ＾２＋、Ｃｓ＾＋的浸出率较低。     

苛性白云石与菱苦土复合镁质胶凝材料的制备及其应用

将苛性白云石与菱苦土按适当比例混合后可构成复合型镁质胶凝材料,其24 h标准稠度净浆的抗折强度可达到9.3 MPa,3 d的净浆抗压强度可达到74.8 MPa,用复合型镁质胶凝材料制备的镁质混凝土（ρ=1 000～1 300 kg/m^3）的抗压强度可达到23.25～25.11 MPa,已达到和超过有关标准的要求,可用以生产屋面波纹瓦、房屋内部隔墙型材;另外,在一定程度上增加复合型镁质胶凝材料的细度,能够增加复合型镁质水泥的强度;复合型镁质胶凝材料的凝结时间和安定性均合格。     

Analysis of Hydration Mechanism and Microstructure of Composite Cementitious Materials for Filling Mining

To obtain the compositions and microstructure of hydration products of cementitious material in different hydration ages and its growth law of filling strength, the optimal proportion of composite cementitious material was determined according to the chemical composition of cement clinker which was composed of the Portland cement 32.5R, CSA 42.5 sulphoaluminate cement and two gypsum(CS). The characterization of composite cementitious materials in different hydration ages was conducted by NMR, XRD and SEM techniques. The mechanism of hydration was explored. It is shown that the compressive strength of the test block increases gradually with the increase of hydration age. The microstructure of composite cementitious material can be changed from Al-O octahedron into Al-O tetrahedron in the hydration process. The hydrated alkali alumi niumsilicate formed with Si-O tetrahedron and Al-O tetrahedron. The degree of polymerization of Si-O tetrahedron gradually increased, and the structural strength of cementitious materials continued to increase. The diffraction peak of clinker minerals gradually decreased with the extension of hydration age. The CaSO_4 completely hydrated to produce Aft during hydration which resulted in high early strength of cementitious material. The early hydration product of composite cementitious materials was Aft with a needle bar structure. The main middle and last hydration products were CSH gel and CH gel with dense prismatic shape. The microscopic pore of composite cementitious material gradually decreased and improved the later strength of filling block. The strong support was provided for mined-out area.     

氯氧镁水泥耐水性能的研究

通过对氯氧镁水泥块、粉末及含少量防水改性剂的试样进行对比测定。研究了氯氧镁水泥的耐水性能，提出了寻找新的防水改性剂的途径。     

The Properties and Applications of High-effective Mineral Admixture GRM for Concrete

To utilize industrial residue as building materials is not only the demand for modern concrete technology but also the requirements for maintaining ecological balance and sustainable development. CRM, a new high-effective mineral admixture for concrete, is developed recently from industrial residue, and the systematical studies on CRM's various properties have been performed. The laboratory tests, industrial tests and field applications have shown that CRM can be used as inorganic cementitious material to replace cement, and is also an excellent supplementary cementitious material tor high performance concrete (HPC).     

再结合镁锆制品颗粒组成的研究

由于水泥回转窑用镁铬质耐火材料在使用中生成有害的六价铬盐时环境和人体有危害,所以替代镁铬质耐火材料的研究已成为迫在眉睫的问题．以电熔二钙砂、方镁石一氧化锆共晶材料为原料,研究颗粒组成对制品烧结性能的影响．     

组分对VAE乳液水泥复合防水涂料的性能影响

采用VAE乳液和硅酸盐类水泥为主要原材料,研究了该体系中各组分对涂料性能的影响,结果表明:与不掺水泥的VAE乳液防水涂料相比,这种复合防水涂料的拉伸强度、粘结强度和耐水性均有大幅度提高,是一种综合性能更优的新型防水材料.     

冶金渣制备生态型人工鱼礁混凝土的试验研究

通过正交试验研究了矿渣钢渣熟料石膏体系胶凝材料的强度。胶凝材料正交试验表明：矿渣：钢渣的复合比为7∶1,矿渣和钢渣的比表面积分别为480 m 2·kg -1和550 m 2·kg -1,并与10%的水泥熟料和10%的脱硫石膏复合的胶凝材料具有较高的强度。以优化后的胶凝材料代替水泥,并以热闷法稳定化的钢渣颗粒为骨料,可以制备出抗压强度达到65 MPa以上的人工鱼礁混凝土。利用XRD和SEM方法分析胶凝材料的水化过程,结果表明,水化反应主要生成AFt相和C-S-H凝胶,钢渣、水泥熟料和脱硫石膏的协同作用对矿渣的火山灰活性反应具有重要促进作用。     

Iron ore tailings used for the preparation of cementitious material by compound thermal activation

In the background of little reuse and large stockpile for iron ore railings, iron ore tailing from Chinese Tonghua were used as raw material to prepare cementitious materials. Cementitious properties of the iron ore tailings activated by compound thermal ac-tivation were studied. Testing methods, such as XRD, TG-DTA, and IR were used for researching the phase and structure variety of the iron ore tailings in the process of compound thermal activation. The results reveal that a new cementitious material that contains 30wt% of the iron ore tailings can be obtained by compounded thermal activation, whose mortar strength can come up to the stan-dard of 42.5 cement of China.     

Properties of supersulphated phosphogysumslag cement (SSC) concrete

Supersulphated phosphogysum-slag cement （SSC） is a newly developed non-burned cementitious material mainly composed of phosphogysum （PG） and ground granulated blast furnace slag （GGBFS）, with small amount of steel slag （SS） and clinker （CL）. SSC is a kind of environmentally-friendly cementitious material due to its energy-saving, low-carbon emission, and waste-utilization. We prepared concretes with supersulphated phosphogysum-slag cement, and studied the mechanical properties, micro- properties and resistance to chloride penetration of concrete in comparison with those of portland slag cement （PSC） and ordinary portland cement （OPC） concrete. The test results show that the compressive strength of SSC concrete can reach 38.6 MPa after 28 d, close to PSC concrete and OPC concrete. Microanalyses indicate that large quantities of ettringite and C-S-H, and little amount of Ca（OH）2 are generated during the hydration of SSC. The dense cement paste structure of SSC is formed by ettringite and C-S-H, surrounded unreacted phosphogysum. The property of resistance to chloride penetration of SSC concrete is better than PSC and OPC concrete due to the fact that SSC can form much more ettringite to solidify more Cl^-.