共查询到20条相似文献,搜索用时 46 毫秒
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Jianlei Liu Changwei Lin Taoyong Liu Lei Han Xuefeng Shen Cui Li Anxian Lu 《International Journal of Applied Ceramic Technology》2020,17(2):584-597
Utilisation of industrial solid wastes to prepare products with high added value is an effective way that could relieve environmental pollution and create huge economic benefits. In this work, steel slag based permeable brick (SSPB) was successfully prepared by liquid phase sintering. The BSE-EDS results indicate that the microstructure of the SSPB becomes dense because of the formation of a small amount of glass-liquid phase (Na-K-Ca-Fe-Si-O glass system). The effect of sintering temperature on various properties of the SSPB was systematically studied. It is found that as the sintering temperature increases from 1210 to 1300°C, the permeability deceases gradually, as well as the apparent porosity, water retention and water absorption. In contrast, the bulk density and mechanical strengths show gradually increasing trends. Most important of all, the SSPB sintered at 1270°C for 1 hour shows an excellent permeability (5.70 × 10−2 cm/s) and high mechanical strengths (compressive strength, 36.6 MPa; bending strength, 6.8 MPa). The prepared SSPB is not only likely to be a new type of permeable brick for sidewalk construction, but also relieve greatly environmental pollution from steel slag because of the high utilisation rate of steel slag (as high as 90%). 相似文献
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为取代RH炉用镁铬材料,以电熔镁砂为主原料,分别加入单斜锆、脱硅锆、单斜锆与脱硅锆的混合粉、锆英石制备了ZrO2质量分数分别为15%和20%的镁锆砖,并利用静态坩埚法对比研究了镁锆砖和镁铬砖的抗RH炉渣侵蚀性。结果表明:对于Al2O3含量高且碱度(CaO/SiO2比)大的RH炉渣,镁锆砖抗侵蚀性能优于镁铬砖的;镁锆砖的侵蚀机理是砖中的ZrO2与渣中的CaO迅速反应,形成高熔点物相CaZrO3,能堵塞砖中的孔隙而形成致密保护层,从而阻止钢渣对镁锆砖的进一步侵蚀;而镁铬砖的侵蚀机理是渣中的Al2O3、Fe2O3等R3 和镁铬尖晶石中Cr3 交换,渣与砖反应生成的镁铝尖晶石和镁铁尖晶石使得材料变性,同时由于体积效应使镁铬材料鼓胀开裂,从而导致镁铬砖的严重侵蚀。 相似文献
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研究了气淬钢渣活性、制备钢渣水泥的方案及不同方案下制备的掺气淬钢渣水泥的物理性能及水化机理。结果表明,气淬钢渣活性指数高于普通钢渣,制备掺气淬钢渣水泥适宜采用加入激发剂或复掺水淬高炉矿渣,在激发剂作用下,气淬钢渣掺量达到50%时,其水泥强度满足P.SS32.5级水泥的要求,而普通钢渣在掺量为50%时,强度已达不到水泥的强度要求;而在复掺水淬高炉渣和气淬钢渣作用下,气淬钢渣掺量达到40%时,其水泥强度满足P.SS32.5级水泥的要求,而普通钢渣水泥强度已达不到要求;气淬钢渣用于生产高掺量、高强度等级的水泥是可行的。 相似文献
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用电炉还原渣在高温重构的转炉钢渣作高活性钢渣胶凝材料,并探讨重构钢渣的水化进程、水化产物和力学性能。试验结果表明:重构钢渣的水化热曲线在水化13-35h都有不同程度的放热峰存在,而未重构钢渣水化72h未见任何放热峰。SEM照片清晰显示相较于未重构铜渣,重构钢渣水化产物数量更多,水化浆体结构更为致密。随着水化龄期的延长,重构钢渣水化XRD图谱中硅酸盐矿物特征峰明显降低,无定形的C—S—H含量提高。重构过程有效改善了钢渣的后期强度,掺重构钢渣水泥的抗压强度的活性指数最高达104.0%。 相似文献
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以市售w(Cr2O3)=26.02%的电熔再结合镁铬砖和自制预合成的不同FeO含量的铁浴式熔融还原渣为研究对象,采用旋转圆柱法,研究了铁浴式熔融还原渣中FeO含量(其质量分数分别为0、5%、10%和15%)和试验温度(1 450、1 500、1 550和1 600℃)对镁铬砖试样侵蚀量、显微结构的影响。结果表明:(1)不含FeO的渣对镁铬试样的侵蚀量大于FeO含量(w)为5%的渣,渣中FeO含量(w)为5%~15%时,随着FeO含量的增加,镁铬试样的侵蚀量增大,侵蚀加剧;(2)温度是影响镁铬材料抗渣性能的重要因素之一,温度提高,熔融还原渣对耐火材料的侵蚀加剧。 相似文献
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钢渣混凝土存在着诸多缺陷,限制了其在实际工程中的应用,因此本文探究并提出了钢渣混凝土性能优化方案。首先分析了钢渣对混凝土自重、和易性和体积安定性的不利影响,并建议了可行的优化方案。接着,从钢渣替代率的角度,对钢渣混凝土的耐久性能和力学性能进行了分析,发现合适比例的钢渣用量在混凝土中的再生利用是可行的,且钢渣混凝土的整体性能较优于普通混凝土。最后,在全文分析的基础之上,为了充分优化钢渣混凝土的性能,建议将钢渣作为粗、细骨料和钢渣粉的替代率控制在合理范围之内。本文旨在探究钢渣及其替代率对钢渣混凝土性能优化的影响,并建议可行的优化方案,为工程应用试验提供参考。 相似文献
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利用粉磨至不同比表面积的转炉钢渣微细粉取代部分水泥进行了C60混凝土的早期和后期强度及坍落度试验,考察了钢渣微细粉的比表面积及掺入量、水胶比和减水剂掺入量对混凝土性能的影响,并用PoreMaster——60孔测定仪测定了硬化混凝土的孔分布。试验结果表明,钢渣微细粉的比表面积为487m^2/kg、掺入量为15%-20%时,可获得令人满意的混凝土3d和28d抗压强度;随着水胶比的增大,混凝土3d和28d抗压强度显著降低,坍落度急剧增大;减水剂掺入量对混凝土坍落度影响明显,但对混凝土强度影响不大。 相似文献
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Yaqiong Gui Min Huang Yongpeng Luo Chong Deng Zichen Zhou Shenxu Bao 《International Journal of Applied Ceramic Technology》2023,20(4):2620-2629
The sintered permeable brick was prepared using granite waste and burnt coal cinder (BCC) as raw materials to ensure the utmost utilization of both solid wastes. The effect of various parameters, such as the proportion of raw materials, granite particle size and sintering temperatures on the properties of the permeable brick were studied, and the relevant sintering mechanism was clarified. The differential scanning calorimetry curves indicate that the mixture of granite waste and BCC begins to melt at a lower temperature, which is lower than the temperature for melting them alone, so the use of them to prepare sintered bricks will reduce energy consumption. The optimal conditions for the preparation of the permeable bricks were determined as the mass ratio of granite waste to BCC of 80: 20, sintering temperature of 1150–1175°C, and granite particle size of .9–1.25 mm. It was found that the permeability and the flexural strength of the samples can reach 3.41 × 10 −2 cm/s and 4.2 MPa, respectively, which both exceed the requirements specified in the national standard of China. 相似文献
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钢渣比表面积和掺入量对水泥性能的影响 总被引:3,自引:0,他引:3
提高钢渣的综合利用已经成为亟需解决的环境课题和资源课题,意义重大.研究了钢渣比表面积及掺入量对硅酸盐泥标准稠度需水量、凝结时间和强度的影响;同时研究了钢渣(比表面积约为400m2/kg)与矿渣或钢渣与粉煤灰复掺,对水泥度的影响:并通过FI-IR和SEM测定,对养护28d的硬化浆体水化产物的物相组成、形貌及微观结构进行了分析.结果表明(1)钢渣的比表面积越大,其活性越高;(2)掺加适量(≤30%)磨细钢渣,可以提高硬化浆体的致密度,降低孔隙率,提高强度(3)钢渣与矿渣、钢渣与粉煤灰复掺时,综合效果更佳. 相似文献
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在混凝土中分别单掺钢渣微粉、复掺钢渣微粉和矿渣粉,研究了其对混凝土工作性能、力学性能的影响,并通过X射线衍射(XRD)、扫描电镜(SEM)等现代测试手段分析了其对水泥水化影响的机理。实验确定了钢渣微粉、矿渣粉用做混凝土掺合料的最佳掺量:单掺钢渣微粉,其掺量不宜超过15%;钢渣微粉与矿渣粉具有很好的"互补效应",当两者在胶凝材料中的总掺量达到30%,其中钢渣微粉掺量为15%时,能表现出较好的后期强度。 相似文献
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Autoclave properties of kirschsteinite-based steel slag 总被引:1,自引:0,他引:1
Guangren Qian Darren Delai SunJoo Hwa Tay Zhenyu LaiGuangliang Xu 《Cement and Concrete Research》2002,32(9):1377-1382
The kirschsteinite-based steel slag is one kind of low-alkalinity steel slag. This steel slag hardly behaves as any hydraulicity. In this paper, the hydrothermal products and binding properties of this slag, after being subjected to autoclave treatments, were evaluated. The results show that a hydrothermal autoclave reaction could modify the binding behaviours of kirschsteinite-based steel slag. The main hydrothermal product of pure kirschsteinite-based steel slag was Fe-hydrogarnet, which exhibited poor binding strength. However, the system of quartz-kirschsteinite steel slag appeared to have excellent binding properties due to autoclave treatment, in which the kirschsteinite phase was hydrothermally changed into Fe-substituted tobermorite. Meanwhile, Fe-substituted tobermorite phase was still stable relative to xonotlite over 345 °C. 相似文献