Lithium porcelain clay tailings (containing 1.2wt.% Li2O) blended with other chemical raw materials were used to develop a new glass-ceramic of CaO–MgO–Al2O3–SiO2 system for rolling process. The effects of TiO2 and ZnO oxides on melting and crystallization behaviors of glasses were investigated by DTA, XRD, EPMA and viscosity test. The results showed that melting temperature, forming temperature and glass transition temperature (Tg) of glasses were decreased with the increase of ZnO addition. Nevertheless, the crystallization temperature was shifted from 864 to 901°C when the addition of TiO2 decreased from 2wt.% to 0.5wt.%. Diopside as a major crystalline phase and spinel as a minor phase are precipitated in M3 specimen with 2.5wt.% ZnO and 0.5wt.% TiO2. The columnar and granular crystalline phases were distributed in M3 specimen nucleated at 750°C for 2h and followed by crystallization at 1110°C for 2h, which resulted in proper appearance suitable for decorative materials.

It is difficult to research on the surface structure of amorphous phase in fly ash during leaching reaction due to crystalline phase and complex structure. In the present work, in order to reveal the effects of leaching reaction on the surface structure of amorphous phase in fly ash, the modelling CaO-Fe2O3-Al2O3-SiO2 glass was prepared by the traditional melting methods. The leaching reaction of CaO-Fe2O3-Al2O3-SiO2 glass with 7.5 M KOH was investigated by spectroscopy, spectrophotometer and wet chemical method. The results show that the content of Q (1), Q (2), Q (3) and Q (4) of glass without corrosion was 4.21, 9.51, 23.03 and 52.55%, respectively, which shows that the network polymerization of glass is compact. The leaching reaction of glass can be described by the following equation: dS/dt = k/(r + S (0)). Leaching in KOH for various times induces the content of Q (4) and Q (1) to be decreased, and Q (2) and Q (3) increased, resulted in the depolymerization of network and the surface glass dissolved in alkaline solution to form a gel phase. In stage one of leaching reaction, the rate of iron ion leached from glass surface was slow, which resulted in the small slope of straight-line relationship of leaching curve. In the following stage, the leaching rate of iron ion increased with the prolongation of time.

As the mostly widely used building material,concrete draw an increasing attention for its huge environmental impact.Environment impact assessment of three kinds of C50 concrete prepared with three different concrete placing processes:Ordinary Process(OP),Scattering-Filling Aggregate Process(SFAP),Preset Aggregate Process(PAP) were assessed by the method of Life Cycle Assessment(LCA).The volume analysis and index of economic effectiveness were carried out also.The results indicate that the environment performance of concretes prepared by SFAP、PAP are quite similar while much better than that of concrete prepared by OP,among those three concretes,the SFAP is easy to handle and the concrete prepared with SFAP is much more environment friendly and has better technical and environmental benefit.

该文综述了赤泥的形成以及赤泥的物理性质、化学成分、矿物组成。并对赤泥在水泥基材料中的综合应用:水泥生料和混合材、生产碱激发水泥、混凝土掺合料以及路面基层的研究进展进行了报道,也总结了其在陶瓷、微晶玻璃中的应用研究的进展情况。

With the development of concrete building techniques,decorative concrete has been widely used in some modern buildings,to devel-op photocatalytic self-cleaning concrete and bring it to market can improve the decorative effect and give environment purification function of concrete.In this paper,the selection and reaction mechanism of photocatalyst to prepare photocatalytic self-cleaning concrete are introduced;the processing,the degradation efficiency and the practical applications of photocatalytic self-cleaning concrete materials are reviewed in details;Some problems and limitations existing in engineering application of these concrete materials are also discussed.