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  slag cement
A comparison between the model predictions and the experimental results in literature shows that the presented computer model can successfully predict the hydration process and the microstructure development of hydrating slag cement paste.
      
A newly developed version of a three-dimensional computer model for simulating the hydration and microstructure development of slag cement pastes is presented in this study.
      
Three-dimensional computer modeling of slag cement hydration
      
The model predictions are further used to calculate some properties of hydrating slag cement pastes, including the molar fractions of products, the water retention, chemical shrinkage and porosities of pastes.
      
Fiber-reinforced cement composites were produced in Brazil using blast furnace slag cement reinforced with pulped fibers of sisal originated from agricultural by-products.
      
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Chemical composition, mineral constitution and properties of hydration of the oxygenconverter slag were investigated by chemical analysis, petrographic technique, XRD, DTAand physical testings. The minerals identified are tricalcium silicate, dicalcium silicate and its phosphorouscontaining solid solution, dicalcium ferrite, RO-phase, free lime and some amount of alumi-nate, aluminoferrite, fluor apatite, fluorspar, and metallic iron. The quality of the slag was graded by its content of tricalcium silicate and...

Chemical composition, mineral constitution and properties of hydration of the oxygenconverter slag were investigated by chemical analysis, petrographic technique, XRD, DTAand physical testings. The minerals identified are tricalcium silicate, dicalcium silicate and its phosphorouscontaining solid solution, dicalcium ferrite, RO-phase, free lime and some amount of alumi-nate, aluminoferrite, fluor apatite, fluorspar, and metallic iron. The quality of the slag was graded by its content of tricalcium silicate and free lime.When the steel slag has a content of tricalcium silicate>40% and that of free lime<3%,it can be ground together with gypsum to produce qualified steel slag cement. Compressivestrengths of 50~60N/mm~2 and 30~40N/mm~2 have been obtained from slags containing tri-calcium silicate 50~55% and 40~46% respectively.

本文主要阐述氧气转炉钢渣试制水泥的若干问题。用化学分析、岩相分析、X射线衍射分析、差热分析测定了钢渣的化学成分、矿物组成和水化性能,并进行了各主要矿物的理论计算以及钢渣水泥的物理力学性能的测定。 转炉渣的主要矿物为硅酸三钙、硅酸二钙及其含磷固溶体、铁酸二钙、RO相、游离石灰以及其含铁固溶体,此外,有少量的铝酸盐、铁铝酸盐、氟磷灰石、萤石、金属铁粒等。 转炉渣的质量可由硅酸三钙和游离石灰量大体鉴别,以便分级管理和充分利用。对于硅酸三钙含量在40%以上,游离石灰含量在3%以下的钢渣可配以一定量的石膏磨制成钢渣水泥。当钢渣中硅酸三钙含量达50~55%时,其钢渣水泥的28天抗压强度可达50~60N/mm~2;含量在46~50%时,28天抗压强度可达40~50N/mm~2;含量在40~46%时,28天抗压强度可达30~40N/mm~2。

The crystal structures of the compositions in the converter slag at different temperatures are studied. This is of great significance to the appropriate choice of the technology for slag forming and to the production of slag cement.

本文利用X射线高温衍射技术探讨了转炉炉渣成分的晶体结构随温度的不同而发生变化的规律.这对选择合理的造渣工艺,研制纲渣水泥等有重要意义.

The hydration heat evolution rates and the strength developments of two kinds of alkali-phosphorus slag cement (sample Mo activated by NaOH and Ml activated by Na_2 O.SiO_2) at different temperature were studied. The experimental results showed that the influence of temperature on the hydration of Ml was greater than that of Mo, as Ml had a higher apparent activation energy. The apparent activation energy for Mo and Ml were 38.39 and 64.62 KJ/mol respectively.

本文研究了两种碱-磷渣水泥(用NaOH作为碱性激发剂的MO及用Na_2O·SiO_2作为碱性激发剂的M_1)在不同温度下的水化放热速率及强度发展情况。实验结果表明,M1水泥对温度的敏感性高于M0水泥,原因是这两种水泥的表现水化活化能不一样,M0水泥的为38.89KJ/mol,而M1水泥的为64.62KJ/mol。

 
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