无熟料水泥混凝土的水化热与干燥收缩

无熟料水泥混凝土(NSC)是以水淬高炉矿渣(GBFS)和激发剂的混合物作为胶凝材料所配制的新型混凝土,其性能取决于GBFS的碱度、化学成分、玻璃化率以及激发剂的种类和数量。为此,以石膏作为GBFS的激发剂来配制NSC后,采用与普通水泥混凝土(简称OPC)对比的方法,进行了NSC的水化热和干燥收缩实验。结果表明,NSC的水化热远小于普通混凝土(OPC);NSC的早期干燥收缩率略大于于OPC,但可用调节水灰比或延长水中养护的方法来减少其干燥收缩。     

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...     

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。     

无熟料高炉矿渣水泥的水化特性

无熟料高炉矿渣水泥（简称NSC）的水化反应取决于高炉矿渣粉（简称GBFS）的碱度、化学成分、玻璃化率以及激发剂的种类和数量。本文以废石膏和废石灰作为激发剂对高炉矿渣粉的水化结构进行了XRD、DTA、SEM、pH分析，并提供了配制NSC的理论依据。     

无熟料高炉矿渣水泥的水化特性

无熟料高炉矿渣水泥(简称NSC)的水化反应取决于高炉矿渣粉(简称GBFS)的碱度、化 学成分、玻璃化率以及激发剂的种类和数量。本文以废石膏和废石灰作为激发剂对高炉矿渣粉的水化结构 进行了XRD、DTA、SEM、pH分析,并提供了配制NSC的理论依据。     

水淬高炉矿渣超细粉的应用与制备

系统介绍炼铁高炉水淬矿渣的性能、矿渣微粉在水泥和混凝土中的应用及矿渣微粉制备的设备和工艺流程，为冶金企业水淬高炉矿渣的深层次开发利用提供重要参考。     

掺铬铁渣水泥混凝土的试验研究

本文就作为活性混合料的水淬精炼铬铁渣用来配制掺铬铁渣水泥混凝土的物理力学性能作了较全面的试验研究,对比了建筑工程中广泛应用的掺高炉矿渣普通水泥混凝土的性能。认为铬铁渣这种活性混合料完全可以用于配制普通混凝土。     

滩涂淤泥固化土力学特性试验研究

为进一步了解固化材料的种类和掺量等因素对固化土力学特性的影响,采用常规不固结不排 水三轴试验对水泥为主固化剂、氢氧化钠、三乙醇胺、粉煤灰、高炉矿渣和减水剂等为外掺剂配制而 成的固化剂固化滩涂淤泥的固化效果和固化土力学特性进行了试验研究．结果表明：在水泥基准掺 量的基础上,掺入一定量的氢氧化钠、三乙醇胺、粉煤灰和高炉矿渣后,滩涂淤泥固化土的强度得到 了一定的提高,但掺量超过一定值后,其强度反而随着外掺剂掺量的增加而变小．     

粉煤灰矿渣复合水泥强度超叠效应的研究

通过由粉煤灰、水淬粒化高炉矿渣、硅酸盐水泥熟料及适量石膏组成的复合水泥强度试验，系统地研究了其强度叠加效应．在大量试验的基础上，优化了混合材料掺量及比例，选择了较为适宜的激发剂．从理论上分析了复合水泥产生强度超叠效应的原因及早期水化作用机理     

粉煤灰矿渣复合水泥强度超叠效应的研究

通过由粉煤灰、水淬粒化高炉矿渣、硅酸盐水泥熟料及适量石膏组成的复合水泥强度试验，系统地研究了其强度叠国效应，在大量试验的基础上，优化了混合材料琢比例，造反他较为适宜的激发剂，从理论上分析了复合水泥产生强度超叠效应的原因及不化作用机理。     

Properties of supersulphated phosphogysumslag cement (SSC) concrete

Supersulphated phosphogysum-slag cement （SSC） is a newly developed non-burned cementitious material mainly composed of phosphogysum （PG） and ground granulated blast furnace slag （GGBFS）, with small amount of steel slag （SS） and clinker （CL）. SSC is a kind of environmentally-friendly cementitious material due to its energy-saving, low-carbon emission, and waste-utilization. We prepared concretes with supersulphated phosphogysum-slag cement, and studied the mechanical properties, micro- properties and resistance to chloride penetration of concrete in comparison with those of portland slag cement （PSC） and ordinary portland cement （OPC） concrete. The test results show that the compressive strength of SSC concrete can reach 38.6 MPa after 28 d, close to PSC concrete and OPC concrete. Microanalyses indicate that large quantities of ettringite and C-S-H, and little amount of Ca（OH）2 are generated during the hydration of SSC. The dense cement paste structure of SSC is formed by ettringite and C-S-H, surrounded unreacted phosphogysum. The property of resistance to chloride penetration of SSC concrete is better than PSC and OPC concrete due to the fact that SSC can form much more ettringite to solidify more Cl^-.     

Grey clustering theory to assess the effect of mineral admixtures on the cyclic sulfate resistance of concrete

Concrete specimens made with ordinary portland cement or ordinary portland cement incorporating fly ash with the replacement of 10% or 20%, ground blast furnace slag with the replacement of 15% or 30%, or 15% fly ash and 15% ground blast furnace slag were made and exposed to a cyclic sulfate environment. Concrete properties including relative dynamic elastic modulus, chloride ion diffusion coefficient, compressive strength and flexural strength were measured. Effect of mineral admixtures on the cyclic sulfate resistance of concrete was assessed based on the grey clustering theory. The experimental results indicate that the cyclic sulfate resistance of concrete incorporating ground blast furnace slag belongs to the higher grey grade, which exhibits that it possesses excellent cyclic sulfate resistance. With increasing addition of fly ash, the cyclic sulfate resistance of concrete changes from the medium grey grade to the lower grey grade, which shows that incorporation of fly ash is disadvantageous for the cyclic sulfate resistance of concrete.     

废弃混凝土做不同水泥强度掺合料的试验研究

为了使废弃混凝土充分循环利用,通过废弃混凝土磨细粉XRD图谱分析其作为水泥的混合材的可行性。试验表明,用掺量为10%废弃混凝土磨细粉可以生产出标号为32.5的水泥,碱性激发剂对废弃混凝土的激发效果不明显。     

Grey Clustering Theory to Assess the Effect of Mineral Admixtures on the Cyclic Sulfate Resistance of Concrete

Concrete specimens made with ordinary portland cement or ordinary portland cement incorporating fly ash with the replacement of 10% or 20%, ground blast furnace slag with the replacement of 15% or 30%, or 15% fly ash and 15% ground blast furnace slag were made and exposed to a cyclic sulfate environment. Concrete properties including relative dynamic elastic modulus, chloride ion diffusion coefficient, compressive strength and flexural strength were measured. Effect of mineral admixtures on the cyclic sulfa...     

Application of Air-cooled Blast Furnace Slag Aggregates as Replacement of Natural Aggregates in Cement-based Materials:A Study on Water Absorption Property

The influence of air-cooled blast furnace slag aggregates as replacement of natural aggregates on the water absorption of concrete and mortar was studied, and the mechanism was analyzed. The interface between aggregate and matrix in concrete was analyzed by using a micro-hardness tester, a laser confocal microscope and a scanning electron microscope with backscattered electron image mode. The pore structure of mortar matrixes under different curing conditions was investigated by mercury intrusion porosimetry. The results showed that when natural aggregates were replaced with air-cooled blast furnace slag aggregates in mortar or concrete, the content of the capillary pore in the mortar matrix was reduced and the interfacial structure between aggregate and matrix was improved, resulting in the lower water absorption of mortar or concrete. Compared to the concrete made with crushed limestone and natural river sand, the initial absorption coefficient, the secondary absorption coefficient and the water absorption capacity through the surface for 7 d of the concrete made from crushed air-cooled blast furnace slag and air-cooled blast furnace slag sand were reduced by 48.9%, 52.8%, and 46.5%, respectively.     

Influence of Mineral Admixtures on the Permeability of Lightweight Aggregate Concrete

The permeability of lightweight aggregate concrete was studied. Some efforts were taken to increase the resistarwe of lightweight aggregate concrete (LC) to water penetration by using the mineral admixtures of fiy ash, granulated blast furmwe slag or silica fume. Accelerated chloride penetrability test and liquid atmosphere press method were used to study the anti-permeability, of lightweight aggregate concrete. The experimental results show that fly ash, granulated blast furnace slag and silica fume can decrease the permeability of lightweight aggregate concrete, but the effect of granulated blast furnace slag is poor. According to the SEM and pore structure analyzing results, an interface self- reinforcing effect model was presented and the reinforced mechanism of mineral mixture on LC was discussed according to the model described by authors.     

Properties and mechanism of mine tailings solidified and filled with fluorgypsum-based binder material

The properties and microscopic structure of tailings solidification bodies, the hardening mechanism of the fluorgypsum-based binder material (FBBM) and tailings solidification mechanism were investigated. FBBM consisted of 40% fluorgypsum,25%-50% blast furnace slag,10%-35% ordinary Portland cement clinker(OPCC) and 1% activator, which was good material in binding iron ore tailings.XRD analysis showed that the properties of tailings solidification bodies was related to its ettringite content.SEM and XRD analyses of tailings solidification bodies showed that the chemical reaction was produced between FBBM and tailings in the whole hydration process. The hydration of the resulting gel material covered the surface of the tailings particles and formed a gel structure. A large number of ettringite crystals and the remaining board-like gypsum crystals took each end and constituted the structural skeleton. The filamentous network-like calcium-silicate-hydrate(C-S-H) gel bonded firmly together with ettringite crystals, dehydrated gypsum crystals and granular tailings, and formed an extremely dense whole.