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1.
Yang Changhui Pu Xincheng Wu Fang 《保鲜与加工》1999,(1):14-19
AAR expansion ratios of alkali_clinker_slag(ACS)cement mortars are studied by mortar bar test.The influences of the sort of alkalis and the content of clinker on AAR expansion ratio of ACS cement mortars are analysed.On the basis of above mentioned,the mechanism of AAR in ACS cement system is discussed. 相似文献
2.
To increase flexible property of epoxy resin and decrease curing temperature of silicone modified epoxy resin, the epoxy/polysiloxane hybrid materials are prepared by crosslinking hybrid of epoxy endgroup polysiloxane and epoxy resin via UV curing technology under a cationic photoinitiator. The structures and properties of epoxy/polysiloxane hybrid films are investigated by 13C NMR, 29Si NMR, SEM, FTIR, and UV-vis analyzer, respectively. It is found that epoxy/polysiloxane films are obtained by in-situ crosslinking reaction under UV curing process without the phase separation. The epoxy/polysiloxane hybrid films have excellent transparence, thermal resistance, UV blocking and high adhesive properties, which can be applied to various optical fields such as the LED encapsulation materials and electronic encapsulation materials. 相似文献
3.
The ferronickel submerged arc furnace slags are stored up more and more, as a result, seriously influenced the sustainable development of the nickel industry. By grinding, the ferronickel submerged arc furnace slag is mechanically activated, then can be used as supplementary cementitious material, thus a comprehensive utilization way of ferronickel submerged arc furnace slag is developed. Using such processed slag to replace cement from 10% to 40% in mass, with the increase of replacing dosage, the water demand of standard consistency of cement paste is lowered, the fluidity of mortar is raised; the compressive strength of mortar is decreased; the flexural strength is increased followed by a decrease after the dosage is above 10%, the ratio of flexural strength to compressive strength is increased. The experimental results indicate that the ferronickel submerged arc furnace slag can be used as supplementary cementitious material and has an increase of flexural strength and effect of plasticizing and water reducing. 相似文献
4.
为合理利用废弃材料改善生土材料力学性能,通过在素土中掺入糯米浆、废玻璃渣和橡胶,形成改性土体材料,设计5种配合比方案,制作Φ102 mm×116 mm圆柱体试块。通过对其进行轴心抗压强度试验,对比不同配比试件的试验现象、抗压强度、变形能力、荷载位移曲线,分析不同掺合料的作用机理、研究不同掺料不同掺量对抗压强度的影响规律,提出了玻璃渣和橡胶掺量的合理范围。试验结果表明,在素土中掺入糯米浆能提高素土抗压强度,掺入糯米浆、玻璃渣和橡胶,可提高抗压强度和变形能力,但其抗压强度随玻璃渣和橡胶掺量的增多增至3.12 MPa后下降。 相似文献
5.
Cement is a traditional tailings cementation material, which causing the high tailings backfill cost. However, the utilization rate of industrial waste residue, such as steel slag and fluorgypsum, is low. So the steel slag-blast furnace slag-fluorgypsum-based cementation materials preparation with industrial waste residue substitutes for cement. As a result, its cementation tailings performances must be studied. According to mortar fluidity and bleeding quantity of tailing cementation slurry at different time and compressive strength change trend at different hydration ages, the performance of steel slag-blast furnace slag-fluorgypsum-based cementation materials is significantly better than P·O42.5 grade cement and two kinds of commonly used cementation agents in China. After soaking for three days, the pH value of these tailings solidification bodies leaching liquid is less than 9.0, which is much lower than the pH values of three kinds of high alkaline tailings cementation materials mentioned before. Leaching liquid fluorine ion concentration is extremely low. With less impact on environment. SEM analysis also show that these tailings solidification bodies mixing with the steel slag-blast furnace slag-fluorgypsum-based cementation materials have relatively dense microstructure. 相似文献
6.
Qin Lichuan Yang Tao 《保鲜与加工》1991,(1)
The colourcd clinker cement which fired directly from kiln has the advantages of low cost,bright colour and good colour durability.This paper studies the possibility of using calcium flouridc and gypsum combined mineralizer to calcine the col-outed clindcr cement at low temperature.Different methods such as X-ray diffraction ana ysis,scanning electron microscopy,infrared spectra analysis,combined water content chemical asysis,compressive strength test and so on arc used to study the clinder minerals,the colour,the physical and mechanics properties and behaviour of the coloured clinker cement which made both with high quality raw materials and with electric furnace reduced slag additive. 相似文献
7.
Drying shrinkage characteristics of alkali slag cement mortar 总被引：1，自引：0，他引：1
The drying shrinkage characteristics of alkali slag cement mortar from the view of irreversibility are studied. It is found that the shrinkage of alkali slag cement mortar water curing after drying is significantly greater than that of OPC mortar which is cured under the same conditions. The drying shrinkage (14 d) of alkali slag cement mortar activated with NaOH solution and water glass is respectively 5.5 and 2.2 times of those of OPC mortar. Moreover, the majority of drying shrinkage of alkali slag cement mortar is irreversible, and the proportion of this part is up to 86%(activated with water glass) and 68%(activated with NaOH solution). 相似文献
8.
A method of orthogonal test was used to optimize the strength of the cementitious material for preparing the concrete of high-strength artifical reefs.The results show that with the ratio of iron slag:steel slag=7:1,and when 10% cement clinker and 10% gypsum of Flue Gas Desulfurization Waste (FGDW) was mixed with 80% iron and steel slags powder,the mixed cementitious material had an optimized strength.The optimized specific surface area are 480 m 2/kg and 550 m 2/kg for iron slag and steel slag powder respectively.The ordinary portland cement can be totally substituted by such a mixed cementitious material with iron and steel slags as its major components in preparing the concrete for building high-strength artificial reefs.A concrete with a compressive strengh over 65MPa can be prepared by using such a mixture as a cementitious material and steel slag grains as its fine and coarse aggregats which have been stubilized by a hot-simmering method. Hydration processes of net slurry were analysized by XRD and SEM methods. The results show that the hydration products in the system are mainly AFt and C-S-H gel. The results also show that the pozzolanic reaction of iron slags could be largely promoted by the coordinations of steel slags,clinker and FGDW. 相似文献
9.
Soft clay is stabilized by desulphurization gypsum and steel slag-slag blended cementitious materials (GSC), which can not only reuse industrial waste and decrease second pollution, but also can conserve mineral resources and protect natural ecology. The variation of unconfined compressive strength of the clay improved by GSC with different mixing ratios and water-GSC ratio and ages was studied through the laboratory experiments. The long-term strength of stabilized soil is predicted with GSC by quasi-water-GSC ratio. The results show that the more the mixing ratios is, the better the stabilized effect of soft soil is. With increase of curing period, the strength increasing of GSC-soil is consistent with cement-soil, and it has lower strength in the early stage. When mixing ratios of GSC is more than those of cement by 3%, if the water-GSC ratio is less than those of cement, it has the higher strength than cement-soil, after 28 days. The results show that GSC stabilized soil is feasible and it can meet the demand of cure strength. 相似文献
10.
Yang Chang- hui Pu Xin- cheng 《保鲜与加工》1996,(3):67-72
In this paper,the influence of set- retarding on applications of alkali- slag cement and concrete is analysed.Set character of alkali- slag cement and suitability of measures used at home and abtord are discussed.On the basis of above mentioned,it is proposed that the only way to solve the fast- set problem of alkali- slag cement is by incorporating efficient retarders,and researches on mechanism of retarders along with deve loping new composite retarders are the most important topics in the research field of alkali- slag cement and concrete. 相似文献
11.
Repairing concrete crack through embedded pipe is a new attempt in the field of structure repairing and a preparation for a kind of intelligent concrete with self-healing capability.In this paper,the properties of fluid-modified epoxy resin containing different thinners,ethylamine and plasticizer were tested and the effect of fluid-modified epoxy resin in repairing concrete crack through embedded pipe was compared with that of conventional grouting. 相似文献
12.
中国镍铁渣排放量很大,但目前尚未找到大量利用的途径。笔者在分析镍铁渣组成、性能的基础上,对镍铁渣作为活性混合材使用的可能性及效果进行了研究。结果表明:镍铁渣中非晶体矿物的含量为88.1%,含量高达27.07%的MgO主要以顽辉石和镁铁橄榄石两种晶体矿物形式存在。镍铁渣的比表面积影响其活性和在水泥中的掺量。作为活性混合材,镍铁渣比表面积需不低于454.6 m2/kg。比表面积越大,活性指数越大,掺量越大。镍铁渣水泥的压蒸安定性合格,即使在水泥中掺入50%比表面积842.9 m2/kg的镍铁渣,水泥的压蒸膨胀率仅为0.11%,大大低于0.5%的GB750-1992要求,由此证明镍铁渣不会因为MgO含量高而影响其作为活性混合材的使用。 相似文献
13.
Municipal solid waste incineration fly ash (MSWI) was successfully used as raw material in sintering and preparing a calcium sulphoaluminate (CSA) cement clinker in laboratory. The effects of different types and different addition percentages of cement additives on compressive strength and hydration properties were investigated. The results showed that lime (LI) powder / slag (SL) powder was compatible in CSA cement system while the activities of fly ash(FA)/ MSWI was low. Adding these four types of cement additives in CSA cement system respectively, there were negative effects on compressive strengths of hardened cement at early age while LI/SL improved the compressive strength at later age. The performance of combined additives was better, especially, the specimens with 10%LI+10%SL, 10%LI+10%MSWI, and 5%LI+15%SL. 相似文献
14.
The Study on Smelting Ti-Si Ferroalloy by DC Electrothermal Process Using PISC Blast Furnace Titaniferous Slag 总被引：1，自引：0，他引：1
The new process for semiting Ti-Si ferroalloy using Panzhihua Iron & Steel Company (PISC) blast furnace titaniferous slag is introduced. The reduction and impoverishment law of TiO2 in slag and the effects of DC on smelting Ti-Si ferroalloy are studied when smelting Ti-Si ferroalloy by electrosilicothermal method,Ti-Si ferroalloy containing about 20% Ti can be produced by electrosilicothermal method. and Ti recovery rate is less than 60 %. And then, electrosilicoaluminothermal method is developed, by which Ti-Si ferroalloy containing Ti more than 30% and Si less than 35 % can be produced, and Ti recovery rate is higher than 80%. Ti-Si ferroalloy can replace TiFe martially in steelmaking,and residue slag can be used to make cement. 相似文献
15.
In order to achieve the comprehensive utilization of iron slag and steel slag, foamed concrete were prepared by adding small amount of gypsum, lime and clinker in steel slag-iron slag system and using aluminum powder as foaming agent,. The three-day, seven-day and twenty-eight-day bulk density and compressive strength of foamed concrete with the different ratio of the main raw materials were researched. Furthermore, in order to research the hydration mechanism and microstructure of foamed concrete, the XRD and SEM images of the three productions of foamed concrete were analyzed. The results showed that the coordination of the dosage of steel slag and iron slag was better when the former was 30% and the latter was 45%, Meanwhile, the compressive strength was 5.1 MPa, the bulk density was 625 kg/m 3; Ettringite and C-S-H gel synergies generated in steel slag-iron slag system. Besides, hydration activity of steel slag was obviously lower than that of iron slag. 相似文献
16.
具有较好环保性能的包膜材料用于缓控释肥生产,可防止膜材料对土壤造成的潜在危害。本文以明胶、聚乙烯醇为原料复合共混制备膜材料,利用红外光谱(FTIR),扫描电镜(SEM)表征材料结构,并研究了膜材料拉伸强度和断裂伸张率力学性能,受控堆肥条件下的生物降解行为,明胶/PVA复合材料包膜尿素的养分缓释性及对小鼠的急性经口毒性。结果表明:当复合膜材料配比为m(PVA):m(Gel)=4:1时,组分相容性最好,并表现出良好力学性能、养分缓释性能和生物降解性能,复合材料包膜的肥料对小鼠无毒性作用,具有较好安全性。因此明胶/PVA复合膜材料具有较好的环保性能,其作为缓控释肥料的包膜材料具有较好应用前景。 相似文献
17.
The amount of limestone powder, which is a by product of manufactured fine aggregate, is larger and larger with the increase of manufactured fine aggregate. Environment will be severely polluted if the powder is improperly used. The effects of limestone powder on workability, compressive strength, and impermeability of concrete were studied when cement is substituted for the mass proportion of 0, 10, 15, 20 percent with it. The results show that the performances of concrete are better improved when the percentage of limestone powder is about 10 percent. The wet packing density of mixture of limestone powder and cement was measured, and it shows that the degree of density was biggest when limestone powder is 10 percent. This shows that the best mixing proportion of limestone powder and cement may be determined through measuring the change of compactness of mixture of limestone powder and cement. 相似文献
18.
19.
Manganese alloy slag is an industrial waste produced from manufacture of manganese alloy. Recent years environment pollution of manganese slag has been becoming heavier and heavier with the development of manganese industry. Aiming to sort out this problem, combination of manganese slag and ground granulated blastfurnace slag (GGBS) were applied to prepare alkali activated cementitious material. Compressive strength and flexural strength of cementitious material prepared with combination of alkali slag manganese slag were measured. And micro structure of hydration production was investigated by scanning electro microscope (SEM). It was shown that the flexural and compressive strength of cementitious material with alkali GGBS manganese slag system were decreased with the increase of replacement of GGBS by manganese slag. The increase of the fineness of manganese slag was favorable for strength improvement of the alkali GGBS manganese slag material. It was concluded that ground manganese slag had hydraulic activity in alkali activated cementitious material and the activity was lower than that of GGBS. 相似文献
20.
高吸油树脂是一种不同于传统吸油材料的新型高分子材料。简单介绍了研究开发高吸油树脂的目的、意义。系统阐述了高吸油树脂的吸油机理和合成方法的研究进展,并对未来的发展趋势进行了展望。 相似文献