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Development of Steel Slag-Based Solidification/Stabilization Materials for High Moisture Content Soil

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Journal of Renewable Materials 2022年第3期10卷 735-749页

作者： Yu Jia sudong hua Liying Qian Xiaojian Ren Jie Zuo Yanfang Zhang College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China Jangsu Yonggang Group Co. Ltd.Suzhou215628China China Construction Installaction Engineering Co. Ltd.Nanjing210023China

To solve the problems of high moisture content,high viscosity,and poor engineering mechanical properties of soil,this paper using with steel slag(SS)and desulfurization ash(DS)as initial raw materials,realizing the coop-erative treatment of solid waste and solidification of silt soil.The synergistic utilization of SS and DS can reduce the production cost of curing agent and promote its own consumption.According to blended cement of various SS contents and inspected compressive strength performances,the most suitable raw materials ratio was selected.The best formula for this curing agent is cement:steel slag=3:7 with 5%DS,and its 28-day compressive strength can reach 30 MPa.The experiment shows that the effect of DS and Na_(2)SO_(4) reagent with the same quality on early compressive strength improvement of cement and SS system is not much different.In this study,the mineral composition and microstructure of different gel system blocks were characterized by XRD,SEM and EDX,and a large number of webbed structures were found in the SEM test,which was not seen in previous studies.Besides,unconfined compressive strength(UCS),water resistance,and toxic characteristic leaching procedure(TCLP)were used to evaluate silt solidified soil properties.The results demonstrated that the solidified silt could meet not only the standard of general subgrade;but also has a partial stabilization effect of heavy metal ions.

关键词： Steel slag desulfurization ash high moisture content soil synergistic effect strength stabilized soil

Development and Application of a High-Volume Recycled Powder Solidifying Material for Waterworks Sludge

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Journal of Renewable Materials 2022年第4期10卷 939-953页

作者： Xiang Deng sudong hua Fan Xia Yanfang Zhang Dapeng Guo Xinxing Zhu Defei Zhu College of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China China Construction Installation Group Nanjing Construction Co. Ltd.Nanjing210023China Nanjing Pukou Urban and Rural Construction Group Co. Ltd.Nanjing211800China

Recycled powder(RP)is produced as a by-product during the process of recycling construction and demolition(C&D)wastes,presenting a low additional value.Using RP-based solidifying material can not only improve its utilization efficiency,but also reduce the cost of commercial solidifying materials.To date,this is the best solidifying material utilized to dispose the original waterworks sludge(OWS)with high moisture contents(60%),and the product could be used to fabricate non-fired bricks.This has become a new environment-friendly technology of“using waste to treat waste”.In this paper,the influence of different particle sizes and dosages of RP on the prepared solidifying material was studied.Besides,unconfined compression strength(UCS),volume stability,chemical composition,and heat of hydration,pore structure of the solidifying material were characterized.Then,non-fired bricks were prepared by using the solidifying material,recycled aggregate,and original waterworks sludge.The UCS and softing coefficient(SC)of the non-fired bricks were evaluated.As a result,the 28-day UCS of the solidifying material with optimal(M30)was 35.40 MPa,which could reach 84.37%of Portland cement(PC).The addition of RP increased the volume stability of the solidifying material.The addition of a large amount of RP reduced the heat flux and cumulative heat release of the solidifying material,while its porosity increased.The UCS of non-fired brick(NF20)in 28 days was 15.19 MPa and the SC after 28 days was 78.35%.In conclusion,the preparation of solidifying material using RP could be a promising approach and has a great potential in disposal of original waterworks sludge.

关键词： Recycled powder solidifying material original waterworks sludge non-fired brick unconfined compressive strength

Development of a Soil Stabilizer for Road Subgrade Based on Original Phosphogypsum

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Journal of Renewable Materials 2021年第2期9卷 253-268页

作者： Zenghuan Gu Aiguo Fang sudong hua Qingzhou Zhao Lidong Sun Fan Xia Liying Qian Xiaojian Ren College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China China Construction Installation Engineering Co. Ltd.Nanjing210023China Jiangsu YongGang Group Co. Ltd.Suzhou215628China

The research used industrial by-products original phosphogypsum(PG)as the main raw material,slag(SG)and Portland cement(PC)as auxiliary materials,and the optimal additive amount was determined according to the compressive strength value of the sample.Comprehensively evaluate the water resistance and volume stability of the samples,and determine the best formula for new roadbed stabilized materials.The results showed that when the weight ratio of PG,slag and cement was OPG:SG:PC=6:3:1,and mixed with 5%micro silica fume(MSF)and 3‰hydroxypropyl methyl cellulose(HPMC),the sample’s comprehensive performance was the best,specifically,the sample’s compressive strength in 60 days reached 28.8 MPa,the softening coefficient reached 0.9,and the expansion rate was stable at about−0.2%.In addition,the mechanism of action of enhancers MSF and HPMC was analyzed according to use Vicat device,X-ray diffractometer and scanning electron microscope.The best formula SP3GH3 has the best curing effect on soil.The 28-day unconfined compressive strength(UCS)of the sample reached 2.4 MPa,the expansion rate was less than 0.09%,and the water stability coefficient was above 0.79,which was higher than that of the samples cured by traditional cement and lime during the same period.

关键词： Original phosphogypsum subgrade stabilized material compressive strength softening coefficient expansion rate

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钢渣基胶凝材料在土壤固化中的应用研究

新型建筑材料 2024年第6期51卷 101-104,109页

作者：卢进赵国权张铮钱晓明赵天彪张栋锐华苏东中交上海航道局有限公司上海200002 中交上海航道勘察设计研究院有限公司上海200120 南京工业大学材料科学与工程学院江苏南京211816

工业固废钢渣存在排放量大、利用率不足等问题,设计研究了一种钢渣基胶凝材料,并将其应用于土壤固化。对比探究了钢渣基固化土和水泥固化土的无侧限抗压强度、水稳定性、浸水膨胀率、抗干湿循环和抗冻融循环性能。综合考虑材料成本和性... 详细信息

工业固废钢渣存在排放量大、利用率不足等问题,设计研究了一种钢渣基胶凝材料,并将其应用于土壤固化。对比探究了钢渣基固化土和水泥固化土的无侧限抗压强度、水稳定性、浸水膨胀率、抗干湿循环和抗冻融循环性能。综合考虑材料成本和性能,钢渣基胶凝材料的最佳掺量为7%。在此掺量下,钢渣基固化土的无侧限抗压强度高于水泥固化土,且随着钢渣的粒径减小,固化土的无侧限抗压强度提高;钢渣基固化土的水稳定性和抗干湿循环性能优于水泥固化土,浸水膨胀率相近,能满足一般工程应用的要求;而抗冻融循环性能均表现较差,无法满足严寒地区特殊使用的要求。

关键词：钢渣固废综合利用土壤固化材料

碳纤维复合炭黑导电砂浆导电性能及其电热功能研究

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水泥工程 2024年第1期 89-92页

作者：李金龙顾永明张蕊俞锋张壮张亚男华苏东苏州三佳交通工程有限公司江苏苏州215131 苏州交通投资集团有限责任公司江苏苏州215004 苏州混凝土水泥制品研究院有限公司江苏苏州215001 江苏省高耐久混凝土工程技术研究中心江苏苏州215001 南京工业大学江苏南京210000

本研究介绍了碳纤维复合炭黑导电砂浆的制备方法、导电性能和电热功能研究。导电砂浆作为一种新型的功能性建筑材料,具有导电性能和电热功能,可以应用于感应加热、防冰除雪等多种场景。为了改善导电砂浆的性能,试验探究了采用碳纤维和... 详细信息

本研究介绍了碳纤维复合炭黑导电砂浆的制备方法、导电性能和电热功能研究。导电砂浆作为一种新型的功能性建筑材料,具有导电性能和电热功能,可以应用于感应加热、防冰除雪等多种场景。为了改善导电砂浆的性能,试验探究了采用碳纤维和炭黑复合的制备方法,并分析了碳纤维掺量对导电砂浆电阻率和电热功能的影响。实验结果表明,最佳的碳纤维掺量为胶凝材料质量分数的1%,炭黑掺量为胶凝材料质量分数的0.4%,在通入10 V交流电压下1 h后,试样温度升高13.3℃。电性能测试还证实了碳纤维复合炭黑导电砂浆具有低电阻率和高发热功率密度,具有较强的融雪或除冰能力。然而,为了将这一试验成果应用于更大的场景,还需要进一步研究导电砂浆试样。

关键词：导电砂浆碳纤维电阻率电热功能发热功率

Properties and Application of Oil-well Cement Enhanced with a Novel Composite Toughening Agent

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Petroleum Science 2007年第2期4卷 52-59页

作者： hua sudong Yao Xiao College of Materials Science and Engineering Nanjing University of Technology Nanjing Jiangsu 210009 China

Brittle fracture of cement sheath, induced by perforation and stimulation treatments, can cause cross flow of formation fluid and increase casing damage. A novel agent XL was developed for solving the problem. Experimental results showed that the toughness of the set cement containing XL was improved remarkably. The engineering properties of the slurry containing XL, drag reducer USZ （0.2% BWOC）, filtrate loss additive F 17B （1.2% BWOC） and crystalloid expanding agent F17A （3% BWOC） could meet technical requirements of cementing operation. After perforation, good quality cement sheath enhanced with XL was observed by CBL/VDL logs in a deep well.

关键词： Oil-well cement cementing cement sheath set cement fiber

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高韧性油井固井材料的性能与应用(英文)

硅酸盐学报 2007年第6期35卷 786-790页

作者：华苏东姚晓南京工业大学材料科学与工程学院南京210009

针对射孔和增产措施使油井水泥环产生脆性破坏,带来层间流体窜流和套损率上升等难题,开发了一种新型增韧剂HD[合成橡胶粉H的质量分数(下同)w=5.5%;特种化纤D的w=0.2%]。评价了掺HD水泥石的力学性能和微观结构及水泥浆的工程性能。结果表... 详细信息

针对射孔和增产措施使油井水泥环产生脆性破坏,带来层间流体窜流和套损率上升等难题,开发了一种新型增韧剂HD[合成橡胶粉H的质量分数(下同)w=5.5%;特种化纤D的w=0.2%]。评价了掺HD水泥石的力学性能和微观结构及水泥浆的工程性能。结果表明:掺HD油井水泥石的韧性和弹性均被显著提高,抗冲击功提高了198%～222%,Young模量降低了38%～40%;掺HD(w=5.7%),减阻剂USZ(w=0.2%),降滤失剂F17B(w=1.2%)和晶体膨胀剂F17A(w=3%)水泥浆综合性能满足固井施工的基本要求。对不同水泥环中应力波传播速率的计算和模拟射孔实验表明:水泥石弹性模量的降低有利于韧性的提高。

关键词：油井水泥韧性抗冲击功纤维掺量固井

用BP神经网络优化油井水泥纤维增韧剂的组成

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天然气工业 2005年第7期25卷 72-74页

作者：华苏东姚晓南京工业大学材料科学与工程学院

掺有混杂短纤维的油井水泥增韧剂能够明显改善油井水泥石固有的脆性,大幅度地提高水泥环的韧性。文章通过BP神经网络对实验数据进行学习预测,优化了混杂短纤维在油井水泥增韧剂中的组成,提高了选材的准确性,为纤维增韧剂的选择和应用提... 详细信息

掺有混杂短纤维的油井水泥增韧剂能够明显改善油井水泥石固有的脆性,大幅度地提高水泥环的韧性。文章通过BP神经网络对实验数据进行学习预测,优化了混杂短纤维在油井水泥增韧剂中的组成,提高了选材的准确性,为纤维增韧剂的选择和应用提供了一定的理论依据。通过与回归分析方法进行比较,证明了神经网络预测更准确。

关键词：油井水泥增韧剂神经网络优化组成 BP神经网络回归分析方法神经网络预测实验数据短纤维水泥石水泥环大幅度准确性混杂

On the Pathwise Uniqueness of Solutions of One-dimensional Reflected Stochastic Differential Equations with Jumps

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 149-163页

作者： hua Zhang School of Statistics and Data Science&Key Laboratory of Data Science in Finance and Economics Jiangxi University of Finance and EconomicsNanchang330013China

In this paper, we are concerned with the problem of the pathwise uniqueness of one-dimensional reflected stochastic differential equations with jumps under the assumption of non-Lipschitz continuous coefficients whose... 详细信息

关键词： reflected diffusion processes with jumps pathwise uniqueness local time Meyer It?'s formula