钢渣水泥的耐久性研究

本文对钢渣水泥（ＳＬＣ）的长期强度、硫酸盐侵蚀、碳酸盐侵蚀、海水侵蚀及碱－集料反应等性能进行了实验研究。研究结果表明：钢渣水泥比纯硅酸盐水泥后期强度高，耐磨性好，抗硫本乡盐、碳酸盐和海水侵蚀能力强，碱－集料反应体积膨胀量小。此外，本文还研究了钢渣水泥的水化机理和孔结构性能。     

钢渣热焖工艺及其对水泥性能的影响

本文研究了不同的热焖压力和时间对钢渣活性的影响和钢渣的不同掺量对水泥性能的影响.热焖工艺主要改善的是钢渣的膨胀性,熟料的7 d膨胀率为0.034％,未热焖的钢渣掺入15％和35％时膨胀率分别增加155.9％和311.8％,而1 MPa 1 h热焖后,相比于未热焖的情况,钢渣掺入15％和35％时分别降低77.0％、89.3％,钢渣掺量25％时,其3 d、7 d、28 d 抗压强度分别增加8. 0 MPa、3.6 MPa、2.7 Mpa,分别提高21.1％ 、11. 3％ 、6. 1％.     

高钢渣掺量钢矿水泥体积安定性的研究

0前言 用钢渣生产水泥,目前仍然是钢渣综合利用的重要途径。20世纪 90年代初,我国 50余家钢渣水泥生产企业就已经形成了年产200多万t钢渣水泥的生产规模,但水泥中钢渣掺量一般都不大,难以     

改性钢渣作水泥混合材的基础性能研究

采用高温将粉煤灰和钢渣熔融得到改性钢渣,对掺加改性钢渣后所得水泥的微观结构和宏观力学性能进行研究与分析。结果表明:添加改性钢渣可降低改性钢渣水泥中fCaO的含量;添加改性钢渣水泥的强度比添加普通钢渣水泥的强度略低,但仍可满足P.SS32.5R级水泥强度的要求;改性钢渣作水泥混合材是可行的。     

水泥稳定钢渣性能研究

简述了钢渣的物理力学性质,详细研究了水泥稳定钢渣在水泥不同剂量时的无侧限抗压强度、劈裂强度、冻融劈裂强度等性能,结果表明水泥稳定钢渣性能优良,可用于道路建设.     

磨细钢渣粉作水泥高性能混合材料的研究

研究了以首钢钢渣制备水泥高活性混合材,结果表明钢渣粉的活性指数随其预粉磨的比表面积增加而提高,用足够细的磨细钢渣粉可以制成525普通硅酸盐水泥、525复合硅酸盐水泥、425复合硅酸盐水泥和钢渣矿渣水泥。水泥的安定性、凝结时间、标准稠度用水量均符合国家标准。     

由膨胀剂和粉煤灰加试安定性引来的思考

北京市建委发布了关于CEA膨胀剂加试安定性的规定。北京三联混凝土联营公司公布了关于粉煤灰加试安定性的企业内部规定，希望引起有关方面关注和大家探讨。     

气淬钢渣作水泥混合材的初步研究

研究了气淬钢渣的粉磨特性、掺气淬钢渣水泥的水化反应机理和物理性能。结果表明,气淬钢渣的易磨性明显好于普通钢渣;在掺量达到40%时,掺气淬钢渣的水泥7d抗折强度明显高于掺普通钢渣的水泥。     

钢渣水硬活性及在水泥混凝土中的应用研究进展

论述了钢渣的水硬活性及活化措施,钢渣的安定性问题及改善方法,讨论了钢渣对水泥混凝土工作性、力学性和耐久性的影响,并指出了钢渣在水泥混凝土领域中应用有待进一步解决的问题。     

利用矿热炉渣、矿渣、精炼渣制备复合水泥

为缓解矿渣等高活性混合材资源的紧张,通过对矿热炉渣、矿渣、精炼渣三种渣按照不同比例复掺进行了试验。试验表明,在加入激发剂后,当矿热炉渣掺量为25%、矿渣为5%、精炼渣为5%时,可配制达到PC42.5水泥;当矿热炉渣掺量为30%、矿渣为15%、精炼渣为5%时,仍可配制合格的PC32.5水泥。     

利用锰渣、矿渣、石灰石制备复合水泥

针对目前矿渣等高活性混合材资源的紧张,实验进行了锰渣、石灰石部分取代矿渣制备复合水泥的试验研究。研究表明,当石灰石粉掺量固定为10%时,相同水泥比例下,随着锰渣和矿渣比例的增加,胶砂试块3d强度增加,28d强度有所下降;当加入复合激发剂后复合混合材总掺量为60%,锰渣和矿渣质量比为4:1时,仍能配制合格的P.C32.5标号水泥。     

Preparation of glass-ceramics with diopside as the main crystalline phase from low and medium titanium-bearing blast furnace slag

Because of the low content of TiO₂, the utilization of low and medium Ti-bearing blast furnace slag is a difficult problem. In this study, glass-ceramics with diopside as the main crystalline phase was made by using TiO₂ in the blast furnace slag as the nucleating agent and adding additional elements of TiO₂, Fe₂O₃ and Cr₂O_3. The effects of these three nucleating agents on the phase composition and structural properties of the prepared glass-ceramics were evaluated by DSC, XRD, and SEM to determine their optimal dosage. Research results show that the suitable mass percentages of the TiO₂, Fe₂O₃ and Cr₂O₃ crystal nucleation agents of the glass-ceramics are 7.69%, 0.96%, and 2.88%, respectively. The prepared glass-ceramics have excellent physical and chemical properties, e.g., a bending strength of 114.74 MPa, a bulk density of 2.77 g/cm³, a water absorption rate of 0, and a mass-loss rate of only 0.085%.     

含钛高炉渣的碳化产物对水泥砂浆强度及电阻率的影响

以攀枝花钢铁公司生产的高钛型高炉渣的碳化产物(碳化渣)取代标准砂为集料制备了水泥砂浆。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对高钛型碳化渣进行了成分、物相和形貌表征;测试了不同碳化渣含量下水泥砂浆的抗压强度和电阻率,探讨了不同碳化渣取代量对水泥砂浆电阻率的影响机制。研究结果表明,含有碳化渣的水泥砂浆的强度满足建筑水泥砂浆的要求;在潮湿状态下,碳化渣的引入无法降低28 d龄期水泥砂浆的电阻率;在干燥状态下,当碳化渣的取代量达到60%以上时,水泥砂浆的电阻率可低于标准水泥砂浆,且最低可下降87.5%。高钛型碳化渣可作为导电集料的候选材料用于制备面向建筑加热采暖用的水泥基复合导电材料。     

Activation of blast furnace slag by a new method

Blast furnace slag is used as supplementary cementing material for the production of blended cement and slag cement. Its latently hydraulic properties can be activated by several methods. Most applications employ the use of high pH values in the pore solution (> 13.0) to accelerate the corrosion of the glass network of the slag.It is shown in this work that activation is also possible by lowering the pH to a range between 11.8 and 12.2 by the addition of calcium hydroxide and soluble calcium salts. Among the salts investigated in this study are calcium chloride, calcium bromide, calcium nitrate, calcium formate, and calcium acetate. Other salts can be used alternatively as long as they are able to increase the calcium ion concentration and thus reduce the pH in the pore solution via the calcium hydroxide equilibrium. Complex formation of organic anions with calcium ions in the pore solution is a serious handicap when using organic calcium salts.This concept was tested on a particular slag improving its early compressive strength. It was possible to increase the strength of mortar bars produced from the pure slag from 3 MPa to 25 MPa after seven days by adding calcium hydroxide, calcium carbonate and calcium acetate. The early strength of slag cement containing 80% slag was increased from 6 to 16 MPa after two days by adding calcium chloride. The final strength was increased from 36 to 53 MPa after 28 days (water/cement-ratio = 0.40, 20 °C).Analytical data is included to demonstrate that application of the aforementioned concept is able to increase heat liberation and degree of slag consumption.     

Effect of components fineness on strength of blast furnace slag cement

The strength development of 1:1 mixes of clinker and blast furnace slag with varying fineness of components from 3000 to 6000 cm²/g has been studied. Overall results indicate that in manufacturing blast furnace slag cement (BFSC), it is not only the fineness of the clinker-slag mix but also of the individual components which govern the choice of the mix composition for a desired strength.     

采用热熔态高炉渣和转炉渣生产水泥熟料的探讨

通过对炼铁高炉渣、转炉渣和水泥熟料的组分进行对比分析,发现其组分比较接近。经初步探讨认为,优化高炉渣和转炉渣的成分,使两者在热熔状态下混合均匀,或同时配加部分矿物,可以生成和水泥熟料基本一致的组分。这样既充分利用了高炉渣和转炉渣及其余热,又减少了水泥熟料的资源消耗,达到了废渣综合利用、节能减排和低碳的目的。     

硫酸铵熔融反应法从含钛高炉渣中回收钛

以承钢含钛高炉渣、(NH₄)₂SO₄和KHSO₄为主要原料,通过熔融反应法使其中的钛转化为易溶于水的形式,达到回收钛的目的。考察了(NH₄)₂SO₄加入量、KHSO₄加入量、加热温度和保温时间对钛回收率的影响。实验结果表明,反应温度和保温时间对钛回收率的影响较大。回收钛的最适条件为：含钛高炉渣与(NH₄)₂SO₄的质量比为1∶6,反应温度为350℃,保温时间为27 min,在此条件下钛的回收率为91.7%,硫酸铵中氮的挥发损失率为81.5%。回收钛后所得残渣主要含有大量硫酸钙、二氧化硅和少量钙钛矿、钙铝黄长石。     

Sulfur speciation in granulated blast furnace slag: An X-ray absorption spectroscopic investigation

Sulfur speciation in a granulated blast furnace slag (GGBFS) was analyzed by X-ray absorption near edge structure spectroscopy (XANES) before and after activation by saturated calcium hydroxide and five normal sodium hydroxide solutions. The solution to GGBFS ratio was 0.4.XANES showed that sulfur in GGBFS existed mostly as sulfides (frozen in calcium polyhedra) with a minor amount as sulfate. A slowly-cooled blast furnace slag, in contrast, had most of the sulfide transformed to sulfate. After activation of GGBFS, more sulfate formed and crystalline sulfide phases became more apparent. More slag reacted at lower pH than at higher pH.     

用电厂炉渣作水泥混合材的研究

在水泥生产过程中加入混合材，既可降低水泥生产成本，又能减少环境污染，且能改善水泥性能。作者对电厂炉渣作水泥混合材进行了试验研究。结果表明：(1)炉渣属火山灰质活性混合材料；(2)炉渣可改善水泥安定性；(3)掺入炉渣的水泥后期强度增长率较大。