钢渣-锰渣复合胶凝材料的结构与性能研究

通过复掺锰渣微粉和钢渣微粉取代部分硅酸盐水泥制备钢渣-锰渣复合胶凝材料,系统研究了锰渣掺量对复合胶凝材料力学性能、流动度、水化热、相组成及微观形貌的影响。结果表明,锰渣微粉的掺入能够有效激发钢渣微粉的潜在活性,改性复合胶凝材料的力学强度和微结构。其中,当锰渣微粉掺量为质量分数14%时复合胶凝材料具有最优性能,其7d抗折强度和抗压强度可达5.8MPa、31.4MPa,28d抗折强度和抗压强度高达7.1MPa、43.2MPa,水化放热量降低了约1/2。这主要是由于掺入锰渣可促使铝酸钙凝胶反应形成AFt,并使其填充于C-S-H凝胶间隙,水化产物相互交织,增大了材料的密实度。     

NaOH—nNa2SiO3激发制备碱—双渣胶凝材料研究

研究 采用NaOH-nNa2SiO3激发制备碱-双渣胶凝材料的方法和技术途径,结果表明：将固体碱激发剂、矿渣、高钙粉煤灰渣三种原料按一定比例混合入磨进行粉磨制备得到的碱-双渣胶凝材料28d强度达到30-60MPa,凝结时间正常;这种胶凝材料生产成本低,性能优良,是一种环保的新型胶凝材料。     

聚合铝改性磷石膏基超硫矿渣胶凝材料制备与性能研究

以硫酸盐为主要激发剂,辅以少量硅酸盐水泥激发矿渣,破坏矿渣玻璃体的空间结构,促进矿渣水化,研制出一种低污染环境友好型胶凝材料——磷石膏基超硫水泥。使用新型活性聚合铝为添加剂解决超硫水泥早期强度较低、凝结时间长的问题。对活性聚合铝改性超硫水泥的凝结时间、长期力学性能作了研究;使用水化热、XRD、SEM等测试技术分析其改性提升机理。研究结果表明:掺入活性聚合铝可显著加快超硫水泥早期水化速率,促进胶凝材料水化,提高硬化胶凝材料密实度。     

碱-矿渣-锰合金渣胶凝材料的研制

锰合金渣是生产锰系合金排放的工业废弃物,近年来锰矿资源的开采和利用发展迅速,产生的大量锰渣造成了严重的环境污染。将锰合金渣与矿渣复合,制备了碱-矿渣-锰合金渣胶凝材料,测试了所制备胶结材的抗压和抗折强度,利用扫描电镜分析了其微观结构。研究结果表明,随着锰渣掺量增加,碱-矿渣-锰渣胶凝材料的强度总体呈降低趋势;提高锰渣细度,所制备的胶凝材料强度亦随之增加;碱激发下磨细锰合金渣具有一定的水化硬化活性,其活性低于磨细矿渣。     

NaOH-nNa_2SiO_2激发制备碱-双渣胶凝材料研究

研究了采用 ＮａＯＨ－ｎＮａ２ＳｉＯ３激发制备碱－双渣胶凝材料的方法和技术途径。结果表明：将固体碱激发剂、矿渣、高钙粉煤灰渣三种原料按一定比例混合入磨进行粉磨,制备得到的碱－双渣胶凝材料 ２８ ｄ强度达到 ３０～６０ ＭＰａ。凝结时间正常;这种胶凝材料生产成本低,性能优良,是一种环保的新型胶凝材料。     

高铝水泥对磷石膏基水硬性胶凝材料性能的影响

研究了高铝水泥对磷石膏-矿渣-钢渣免煅烧水泥体系的强度、凝结时间及标准稠度等性能的影响规律,并通过XRD和SEM分析探讨了该水泥体系的水化机理,分析得出该水泥体系的水化产物主要是钙矾石和C-S-H凝胶。结果表明,高铝水泥的加入可以有效提高磷石膏-矿渣-钢渣免煅烧水泥体系的早期强度并缩短凝结时间,使水化产物钙矾石生成量明显增加,从而有效提高该胶凝材料的水化性能;当掺入6%的高铝水泥时,可以制备出3d抗压强度为4.5MPa,28d抗压强度达35MPa左右的高铝-磷石膏基水硬性胶凝材料。     

利用矿渣、脱硫渣及炉渣制备胶凝材料试验研究

直接利用原状脱硫渣与矿渣和炉渣混合后,在水泥熟料、石灰激发剂的作用下,可形成具有较高强度的胶凝材料。通过配合比设计、强度测试,探讨了碱激发剂、脱硫渣含量、养护方式对矿渣-脱硫渣-炉渣胶凝材料强度的影响;并通过XRD、SEM等微观结构测试方法,分析了所制备的胶凝材料的主要水化产物及微观结构。研究结果表明,胶凝材料各组分的比例为w(水泥熟料)∶w(矿渣)∶w(炉渣)∶w(脱硫渣)∶w(石灰)=1∶6∶0.9∶1.8∶0.3时胶凝材料具有良好的性能,其水化主要产物为针状钙矾石和絮状水化硅酸钙。     

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。     

硅渣及废碱水共激发制备碱胶凝材料的研究

对某化工厂的副产品－－废碱水及硅渣作碱胶凝材料的碱性激发剂进行了研究,通过优化废碱水和硅渣的掺入量可制备强度发展良好,凝结时间正常的碱胶凝材料,有效地降低碱胶凝材料的成本,另外,对其水化产物进行了初步研究,发现这种碱胶凝材料水化除生成C－S－H凝胶外,还生成了水化硅铝酸钙Ca(Al2Si5O8).4H2O,硅铝酸钙钠（Na,Ca)Al3Si5O16两种难溶性沸石类矿物。     

半水石膏激发Ⅱ型无水磷石膏的研究

拟用磷石膏制备Ⅱ型无水石膏胶凝材料。为改善无水磷石膏的水化,选用了半水石膏对其进行激发。通过测试半水石膏对凝结时间、强度性能和无水石膏水化的影响,结果表明:半水石膏的快速水化硬化引起溶液中硫酸钙浓度的改变,从而促进无水磷石膏的水化。半水石膏的掺入加速胶凝材料的凝结,提高早期强度;无水磷石膏在激发作用下的水化促进强度的进一步发展,提高后期强度。混合相石膏具有较致密的晶体结构,是一种性能优良的胶凝材料。     

STUDY ON HIGH CONTENT OF BLENDS IN CEMENT

The technology of activation by adding few activators (<1% ) to increase the amount of blends in cement was investigated. The results show that outer activa-tion has a remarkable effect on improving the physical properties of slag cement, flyash cement and volcanic cement. For example, the compressive strength was increased by 5 - 10 MPa. Morever, the application of activation is beneficial to grind-aiding , early strength and water-reducing etc.     

无熟料高炉矿渣水泥混凝土的强度特性

无熟料高炉矿渣水泥混凝土的性能取决于水淬高炉矿渣的碱度、化学成分、玻璃化率以及激发剂的种类和数量。为此,以磷石膏作为激发剂配制无熟料高炉矿渣水泥混凝土后,通过抗压强度及其微观结构的测试探讨了其强度特性。结果表明,早期强度取决于钙矾石的生成量及其所形成的网状空间结构,后期强度取决于C-S-H水化物的生成量及其填充孔隙所形成的密实程度。     

锰渣微粉-石灰石粉作为水泥混合材的试验

以锰渣微粉和石灰石粉按照不同比例进行复掺,研究其物理性能及水化性能。结果表明：锰渣微粉-石灰石粉可以有效减小标准稠度用水量,缩短水泥凝结时间,并且在水泥水化过程中能够很好地发挥其物理、化学综合性能,保证水泥早期和后期的强度。     

Strength of limestone-based non-calcined cement and its properties

A new type of cement was prepared with ground limestone powder, blastfurnace slag, steel slag and gypsum without calcination. The fraction of ground limestone powder in the cement was as high as 40 wt%–60 wt% without Portland clinker. All of its physical properties can meet the requirements of masonry cement standards. The impact of limestone content on physical properties of the cement and determined its impact on law was investigated. The steel slag can excit the aquation activity of this cement effectively, and the influence of its quantity on the strength of the materials was studied, which shows that the optimum quantity of mixing is 10%. By way of changing the different content of the lime stone by quartzy sample, the law of the compression strength and the PH value was determined, confirming that the lime stone can promote the early aquation of the slag and improve the early strength. The main hydration product of this cement is calcium aluminate hydrate, ettringite and calcium silicate hydrate, as indicated by XRD and SEM analysis.     

钢铁渣粉对水泥基材料性能影响机理研究

通过对马钢钢渣粉化学成分、X-射线衍射原材料分析,探究了钢渣粉对水泥基材料力学性能、体积稳定性的影响.试验结果表明:随着钢渣粉掺量的增加,力学性能下降明显,当掺量为10％时,与空白样相比抗压强度略有下降,当掺量为20％时,抗压强度下降幅度较大;钢渣对水泥基材料体积稳定性影响明显,相同龄期随着钢渣掺量增大,自由膨胀率升高.通过化学成分及扫描电镜分析,f-CaO是导致水泥基材体体积膨胀的根源.     

矿粉对水泥和混凝土性能的影响

为了探寻矿粉细度及掺入量对水泥和混凝土性能的影响,通过试验测试方法,分析了矿粉和水泥的基本性质,研究了超细矿粉和普通矿粉的掺量对水泥基材料标准稠度、凝结时间、流动度和力学性能的影响.结果表明：普通矿粉使水泥净浆标准稠度需水量下降,而超细矿粉则增加标准稠度需水量,两种矿粉都使水泥净浆凝结时间略微延长.普通矿粉可以改善水泥净浆的流动度,超细矿粉的加入则降低了水泥净浆的流动度.普通矿粉和超细矿粉降低水泥净浆早期（7 d）抗压强度,提高后期（28 d）抗压强度,掺10％～50％的普通矿粉的水泥净浆28 d抗压强度提高2.9％～9.7％,掺入超细矿粉28 d抗压强度提高3.9％～20.1％,普通矿粉和超细矿粉的最佳掺量为10％～30％;两种矿粉替代10％～50％水泥所配制的混凝土的强度得到了明显的提高.     

Cementing properties of steel slag activated by sodium silicates and sodium hydroxide

Steel slag which is mainly composed of γ-Ca2SiO4 and other silicates or alumino-silicates is activated by sodium sificates and sodium hydroxide. The powders of such steel slag are usually inert to hydrate and subsequently have very low ability of cementing. But when sodium silicates and sodium hydroxide are used as activators the steel slag shows very good properties of cementing. When activated with NaOH solution the hardened slurry of the steel slag has a compressive strength of 11.13 MPa after being cured for 28 days. When activated with Na2SiO3 solution the samples after being cured for 28 days have an average compres- sive strength of 40.23 MPa. While the steel slag slurry which is only mixed with water has a compressive of 0.88 MPa after being cured for 28 days.     

水泥强度诱导提高方法研究

利用物理性能检测、水化放热测定和孔结构测定方法研究了通过掺加微细矿渣、高铝组分和水化硬化浆体诱导提高硅酸盐水泥强度的方法，并对其作用机理进行了探讨，试验表明，适量的微细高铝组分、矿渣组分及水化硬化浆体能够明显提高硅酸盐水泥强度。     

Properties of Steel Slag and Stainless Steel Slag as Cement Replacement Materials: A Comparative Study

To enhance the understanding about the utilization of steel slags as a cementitious material, we comparatively studied the chemical, mineralogical and morphological properties of two types of steel slag; basicoxygen-furnace carbon slag(BOF C) and electric-arc-furnace stainless steel slag(EAF S). Moreover, we studied the standard consistency, setting time and the effect of the slag replacement ratios on the fluidity and compressive strength of blended cement mortar. The experimental results showed that BOF C had higher alkalinity, higher pH value and more hydraulic phases than EAF S. Both types of slag showed water reduction effect due to its high fineness. Neat BOF C paste showed flash set and acceleration in the initial setting time of blended cement especially at high slag proportions. However, EAF S prolonged the setting time of blended cement even at low slag proportions. The pH values for blended cement contained 50% BOF C or EAF S were lower than those of pure cement paste. Despite of slag type, compressive strength gradually decreased with increasing slags content. The strength of BOF C mortar was higher than that of EAF S mortar with the same replacement ratio for the same age. Slag activity index demonstrated that BOF C and EAF S conformed to the Chinese National Standard(GB/T 20491-2006) requirements for steel slag as grade one and grade two, respectively.     

无熟料高炉矿渣水泥混凝土的强度特性

无熟料高炉矿渣水泥混凝土的性能取决于水淬高炉矿渣的碱度、化学成分、玻璃化率以及激发剂的种类和数量.为此,以磷石膏作为激发剂配制无熟料高炉矿渣水泥混凝土后,通过抗压强度及其微观结构的测试探讨了其强度特性.结果表明,早期强度取决于钙矾石的生成量及其所形成的网状空间结构,后期强度取决于C-S-H水化物的生成量及其填充孔隙所形...