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Journal of Renewable Materials 2021年第11期9卷 1991-1999页

作者： Yongdong Xu tingshu he College of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an710055China

This work aims to utilize waste glass powder(WGP)as a plementary material to mitigate the strength shrinkage caused by the alkaline *** glass power was used to replace cement by 0%,10%,and 20%to evaluate waste glass powder on the alkaline accelerator’s strength *** results show that the strength improvement effect of unitary glass powder is *** methods have been proposed to use sodium sulfate and waste glass powder synergism,using the activity of amorphous silica in glass *** with the reference group,the compressive strength of 28d mortar increases by 67%when the sodium sulfate content is 2.5%,and the replacement amount of waste glass powder is 10%.Besides,XRD and SEM analysis of hydration products also confirmed that the synergistic effect of sodium sulfate and waste glass powder could reduce strength *** findings presented in this paper are pivotal for using waste glass to solve the problem of strength inversion caused by the alkaline accelerator.

关键词： Synergism waste glass powder alkaline accelerator strength inversion

Effect of CSH Crystal Nucleus on Steam-Free Cured Fly Ash Precast Concrete Components

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Journal of Renewable Materials 2023年第9期11卷 3485-3500页

作者： Ruyi Luo Yanyan Hu tingshu he Xiaodong Ma Yongdong Xu College of Materials Science and Engineering Xi’an University of Architecture&TechnologyXi’an710055China

The measures of steam curing and early-strengthening agents to promote the precast components to reach the target strength quickly can bring different degrees of damage to the *** on this,the new nanomaterial CSH-the hydration product of cement effectively solves these measures’disadvantages,such as excessive energy consumption,thermal stress damage,and the introduction of external *** this paper,the effect of CSH on the early strength of precast fly ash concrete components was investigated in terms of setting time,workability,and mechanical properties and analyzed at the microscopic level using hydration temperature,XRD,and *** results showed that under the same workability,CSH could significantly reduce the amount of admixture,shorten the final setting time,almost not affect the initial setting time,and accelerate the hydration of *** the optimum dose of 5%,the mechanical properties of the specimens were improved by more than 98%within 12 h of hydration,resulting in an earlier release time of 12 h and no risk of strength inversion *** results of this paper give theoretical support to the behavior of precast components under steam-free curing.

关键词： Fly ash concrete prefabricated components steam-free curing CSH crystal nucleus tobermorite

Influences of Polycarboxylate Superplasticizers on Rheological Behavior of Low-cement Castables

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China's Refractories 2013年第2期22卷 33-37页

作者： LI Zhukai he tingshu HUANG Xiaoyan College of Material & Mineral Resources Xi'an University of Architecture and Technology Sichuan College of Architectural Technology

Influences of different superplasticizers （ STP. KSJSTO and LMS-P） on rheological behavior of low-cement castables and the mechanisms were analyzed. The shear stress and viscosity under different shear rates of matrix slurry were determined using a NXS-I IA rotary viscometer. Effects of different admixtures on the rheological properties of slurry was analyzed theoretically. Sodium tripolyphosphate and poly＇carboxylate superplasticizers KS-JSTO and LMS-P） can improve the fluidity and initial setting time. With STP. the slurry is plastic flow. With KS-JS70 or LMS-P increasing, the slurrv changes from ***, pseudoplastic flow to dilatant flow successively. Th, e optimum dosages of STP. KS-JSTO and LMS-P are 0. 15%. 0. 25% and 0. 40%, respectively. KS-JS70 and LMS-P can significantly reduce the slurry viscosity and shear stress to improve the workability of construction. Both shear stress and viscosity shall be taken into account for on-site construction.

关键词： polycarboxylate superplasticizer theological behavior apparent viscosity shear stress

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碳化对碱矿渣水泥石干燥收缩的影响

建筑材料学报 2015年第2期18卷 221-227页

作者：何娟何廷树杨长辉王振军西安建筑科技大学材料与矿资学院陕西西安710055 重庆大学材料科学与工程学院重庆400045 长安大学材料科学与工程学院陕西西安710061

为研究碳化行为对碱性胶凝材料干燥收缩的影响,以水玻璃或NaOH为碱组分,制备φ27.5×50 mm碱矿渣水泥石试件,并测量φ27.5×1 mm水泥石薄片在干缩条件与碳化条件下的直径变化率,以表征碱矿渣水泥石的干燥收缩与碳化收缩.结果表明：在（2... 详细信息

为研究碳化行为对碱性胶凝材料干燥收缩的影响,以水玻璃或NaOH为碱组分,制备φ27.5×50 mm碱矿渣水泥石试件,并测量φ27.5×1 mm水泥石薄片在干缩条件与碳化条件下的直径变化率,以表征碱矿渣水泥石的干燥收缩与碳化收缩.结果表明：在（20±1）℃,相对湿度（70±5）％的条件下,以NaOH为碱组分的碱矿渣水泥石干燥收缩大于以水玻璃为碱组分的碱矿渣水泥石干燥收缩;碳化使硅酸盐水泥石的收缩增加,但未增加碱矿渣水泥石的收缩;碱当量适当提高有利于减小碱矿渣水泥石的干燥收缩与碳化收缩;以模数为1.2～1.5的水玻璃配制的碱矿渣水泥石干燥收缩与碳化收缩较小.

关键词：碱矿渣水泥石碳化干燥收缩

Analysis of microwave heating of molybdenum concentrate in cylindrical container

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Analysis of microwave heating of molybdenum concentrate in c...

Ca^(2+)和 Mg^(2+)对辉钼矿可浮性的影响对比

2011 4th IEEE International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： Wang Sen he tingshu Zhang Weihua School of Material Science & Engineering Xian University of Architecture & Technology School of Architecture Xian University of Architecture & Technology

ISBN: (纸本)9781612848334

Microwave heating is very popular in mine industries as well as in home and abroad to warm up mine quickly. However, this technique provides non-uniform heating within the system. The potential existence of standing wave due to the transmission and reflection from interfaces is responsible for this non-uniform heating. Therefore, it is important to study the coupling between electromagnetic wave propagation and energy transfer in the system to predict the temperature distribution within the container. In this paper, a closed-form analytic solution is presented to predict the temperature distribution within a cylindrical shaped container under microwave heating by solving an unsteady energy equation. A simplified Maxwell’s equation is solved for electric field distribution within the body. The heat generation by microwave is calculated from the electric field distribution within the body using Poynting theorem. The effects of cylinder radius, heat transfer coefficient and incident frequency are studied for different length of the cylindrical container. It is found that the temperature within the body is very sensitive to cylinder length and time. The results indicate that uniform and effective heating depend on the proper integration of geometric parameters and dielectric properties of the object as well as the frequency of the incident electromagnetic wave. This rigorous analytic investigation will provide significant insight to understand and overcome the challenge of non-uniformity in temperature distribution in microwave heating.

关键词： microwave heating molybdenum concentrate cylindrical container

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过程工程学报 2021年第2期21卷 153-159页

作者：施帅何廷树李慧西安建筑科技大学资源工程学院陕西西安710055

通过辉钼矿单矿物浮选试验,Ca^(2+),Mg^(2+)的溶液化学计算及辉钼矿表面Zeta电位和XPS检测,对比研究了Ca^(2+),Mg^(2+)对辉钼矿可浮性影响的差异性。结果表明,Ca^(2+),Mg^(2+)均会吸附于辉钼矿表面,改变辉钼矿表面Zeta电位并对辉钼矿的... 详细信息

通过辉钼矿单矿物浮选试验,Ca^(2+),Mg^(2+)的溶液化学计算及辉钼矿表面Zeta电位和XPS检测,对比研究了Ca^(2+),Mg^(2+)对辉钼矿可浮性影响的差异性。结果表明,Ca^(2+),Mg^(2+)均会吸附于辉钼矿表面,改变辉钼矿表面Zeta电位并对辉钼矿的可浮性产生抑制作用,且随pH值增大,抑制作用增强;碱性条件下Mg^(2+)对辉钼矿可浮性的抑制强于Ca^(2+),且pH>9.0时,两种离子抑制作用的差异性更明显;pH=11.0时,Mg^(2+)为800 mg/L的矿浆中辉钼矿的回收率较Ca^(2+)为800 mg/L的矿浆中辉钼矿的回收率下降约34个百分点;Ca^(2+),Mg^(2+)均能与辉钼矿“棱”上的MoO4^(2–)结合形成钼酸盐沉淀,通过化学吸附的形式存在于辉钼矿表面;当pH>9.15时,钙仍以Ca^(2+),Ca(OH)+的形态存在并吸附于辉钼矿表面,且Ca^(2+)矿浆Zeta电位随pH增大呈上升趋势,但镁则以Mg(OH)2形态沉积于辉钼矿表面,且Mg^(2+)矿浆Zeta电位随pH增大迅速降低,这是两种离子对辉钼矿可浮性抑制作用不同的主要原因。

关键词：辉钼矿钙镁离子可浮性抑制作用差异性

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甲基硅酸钠对脱硫石膏砌块耐水性能的影响

建筑材料学报 2021年第2期24卷 247-253,259页

作者：何廷树亢泽千陈畅西安建筑科技大学材料科学与工程学院陕西西安710055

采用扫描电镜、红外光谱分析等手段,研究了甲基硅酸钠掺量对脱硫石膏砌块耐水性能的影响.结果表明:当甲基硅酸钠掺量为0.2%~1.4%时,随着掺量的增大,脱硫石膏砌块强度先增后减,表面接触角不断增大,吸水率不断降低,软化系数稳定增长;与纯... 详细信息

采用扫描电镜、红外光谱分析等手段,研究了甲基硅酸钠掺量对脱硫石膏砌块耐水性能的影响.结果表明:当甲基硅酸钠掺量为0.2%~1.4%时,随着掺量的增大,脱硫石膏砌块强度先增后减,表面接触角不断增大,吸水率不断降低,软化系数稳定增长;与纯脱硫石膏砌块相比,甲基硅酸钠掺量为1.0%的脱硫石膏砌块强度变化不大,但吸水率降至7%、软化系数达到0.85;甲基硅酸钠在砌块表面和孔壁形成的疏水性薄膜导致砌块吸水率降低、软化系数提高;掺入甲基硅酸钠会改变二水石膏晶体形貌和脱硫石膏砌块的微观结构,从而影响砌块强度.

关键词：甲基硅酸钠石膏砌块耐水性能力学性能微观形貌

自磨改性对再生粗骨料及再生混凝土性能的影响

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材料导报 2023年第16期37卷 157-162页

作者：林一柯何廷树达永琪西安建筑科技大学材料科学与工程学院西安710055

提出了一种新的再生骨料改性技术即自磨改性,系统研究了该技术对再生粗骨料和再生混凝土性能的影响规律,探究了再生微粉附着于再生骨料表面时,对再生混凝土工作性能及力学性能的影响规律。结果表明:自磨改性可以有效改善再生粗骨料的粒... 详细信息

提出了一种新的再生骨料改性技术即自磨改性,系统研究了该技术对再生粗骨料和再生混凝土性能的影响规律,探究了再生微粉附着于再生骨料表面时,对再生混凝土工作性能及力学性能的影响规律。结果表明:自磨改性可以有效改善再生粗骨料的粒形和界面形貌,有利于附着表面砂浆层的剥离,改性后再生粗骨料的表观密度提高了9.7%,压碎指标及吸水率分别降低了37.6%和51.4%,改善了再生混凝土的流动性和黏聚性,有效提升了再生混凝土的抗压强度。再生微粉颗粒尺寸小且表面疏松多孔,同时具有微集料填充效应和火山灰活性,对再生混凝土的后期强度具有明显的提升作用。

关键词：自磨改性再生粗骨料再生混凝土再生微粉二次水化

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回水对某辉钼矿浮选的影响及其原因分析

矿业研究与开发 2016年第9期36卷 19-23页

作者：何廷树石旭西安建筑科技大学材料与矿资学院陕西西安710055

为了考察回水对配矿后的辉钼矿浮选指标的影响,分别用生产回水和清水进行相同条件下的浮选试验。试验结果表明,相比清水,利用生产回水进行浮选可减小最佳磨矿细度以及捕收剂煤油和起泡剂2#油的用量,但会严重影响浮选指标,使精矿品位降低... 详细信息

为了考察回水对配矿后的辉钼矿浮选指标的影响,分别用生产回水和清水进行相同条件下的浮选试验。试验结果表明,相比清水,利用生产回水进行浮选可减小最佳磨矿细度以及捕收剂煤油和起泡剂2#油的用量,但会严重影响浮选指标,使精矿品位降低7.35%,回收率降低4%,选用回水浮选最终获得了品位为3.94%,回收率为89.40%的精矿产品。

关键词：浮选生产回水磨矿细度回收率

有机防冻组分对混凝土液体防冻泵送剂性能的影响(英文)

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硅酸盐学报 2007年第12期35卷 1646-1650页

作者：何廷树周华新白恩郦西安建筑科技大学材料科学与工程学院西安710055

研究了有机防冻组分甲醇(CH3OH)、乙二醇[(CH2OH)2]和三乙醇胺[N(CH2OH)3]对混凝土液体防冻泵送剂性能的影响。结果表明:CH3OH,(CH2OH)2及N(CH2OH)3均可增大硫酸钠(Na2SO4)在–5～5℃的饱和溶解度,并且CH3OH和(CH2OH)2的增溶作用大于N(C... 详细信息

研究了有机防冻组分甲醇(CH3OH)、乙二醇[(CH2OH)2]和三乙醇胺[N(CH2OH)3]对混凝土液体防冻泵送剂性能的影响。结果表明:CH3OH,(CH2OH)2及N(CH2OH)3均可增大硫酸钠(Na2SO4)在–5～5℃的饱和溶解度,并且CH3OH和(CH2OH)2的增溶作用大于N(CH2OH)3的。CH3OH和(CH2OH)2,特别是(CH2OH)2降低掺液体防冻泵送剂的水泥净浆初始流动度及经时保留值的程度较N(CH2OH)3的低。CH3OH和(CH2OH)2与水泥的适应性比N(CH2OH)3的好。3种有机防冻组分中,CH3OH和(CH2OH)2,特别是(CH2OH)2的防冻效果优于N(CH2OH)3的,并且N(CH2OH)3还会降低R-7+28[掺防冻泵送剂的受检混凝土在–15℃下养护7d,再移至(20±3)℃及相对湿度90%以上的标准养护条件下养护28d的抗压强度,与不掺防冻泵送剂的基准混凝土在标准养护条件下养护28d的抗压强度之比]和R–7+56(掺防冻泵送剂的受检混凝土在–15℃下养护7d,再移至标准养护条件下养护56d的抗压强度,与不掺防冻泵送剂的基准混凝土在标准养护条件下养护28d的抗压强度之比)。因此,虽然N(CH2OH)3是一种有效的有机早强剂,但它并不是一种有效的有机防冻剂。

关键词：液体防冻泵送剂有机防冻组分混凝土硫酸钠适应性,防冻效果