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Comprehensive utilization of solid waste resources: Development of wet shotcrete for mines

International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1692-1704页

作者： Yafei Hu Shenghua Yin Keqing Li Bo Zhang Bin Han School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China

The development of solid waste resources as constituent materials for wet shotcrete has significant economic and environmental advantages. In this study, the concept of using tailings as aggregate and fly ash and slag powder as auxiliary cementitious material is proposed and experiments are carried out by response surface methodology(RSM). Multivariate nonlinear response models are constructed to investigate the effect of factors on the uniaxial compressive strength(UCS) of tailings wet shotcrete(TWSC). The UCS of TWSC is predicted and optimized by constructing Gaussian process regression(GPR) and genetic algorithm(GA). The UCS of TWSC is gradually enhanced with the increase of slag powder dosage and fineness modulus, and it is enhanced first and then decreased with the increase of fly ash dosage. The microstructure of TWSC has the highest gray value and the highest UCS when the fly ash dosage is about 120 kg·m^(-3). The GPR–GA model constructed in this study achieves high accuracy prediction and optimization of the UCS of TWSC under multi-factor conditions.

关键词： tailings solid waste wet shotcrete machine learning mix proportion

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Effects of Recycled Aggregate Content on Pervious Concrete Performance

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Journal of Renewable Materials 2020年第12期8卷 1711-1727页

作者： Lei Guo Zi Guan Lixia Guo Weiping Shen Zhilong Xue Pingping Chen Mingru Li School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou450046China Henan Water Valley Research Institute Zhengzhou450046China Henan Key Laboratory of Water Environment Simulation and Treatment Zhengzhou450002China

A recycled aggregate(RA)was prepared by crushing and sieving demolished discarded concrete pavements and was subsequently tested and analyzed to determine its various physical properties.On this basis,pervious concrete(PC)mix proportions were designed.Coarse RA particles with sizes of 5–10 and 10–20 mm were selected.Concrete specimens were prepared with a water–cement ratio of 0.3,an aggregate–cement ratio of 4.5,the substitute rates of RA with 0,25%,50%,75%and a single-/double-gap-graded RA mix(mass ratio of particles with sizes of 5–10 mm to particles with sizes of 10–20 mm:1:1,1:2,2:1,2:3 and 3:2).Various properties of the RA-containing PC(RPC)were determined by analyzing the compressive strength,splitting tensile strength,effective porosity,permeation coefficient and impact and abrasion resistance of the specimens.The results showed the following:The density of the RPC decreased with an increasing RA replacement ratio.The density of the RPC prepared with a double-gapgraded RA mix was lower than that prepared with a single-gap-graded RA(particle size:10–20 mm)mix.The permeation coefficient of the RPC increased with increasing porosity.The splitting tensile strength of the RPC was positively correlated with its compressive strength.The compressive strength of the RPC decreased with increasing porosity.The regression analysis showed that the impact and abrasion resistance of the RPC increased with increasing compressive strength.In addition,all of the RPC specimens met the strength and permeation requirements.This study can provide theoretical support for the application of RPC.

关键词： Recycled aggregate recycled pervious concrete strength permeability wear resistance mix proportion

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Effects of Curing Conditions on Strength Development of High Strength Concrete

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China Ocean Engineering 1997年第1期12卷 99-108页

作者： Cai, YB Kwan, KH UNIV HONG KONG DEPT CIVIL & STRUCT ENGNHONG KONGHONG KONG

This paper presents the results of a series of studies on the influence of curing conditions on the strength development of high strength concrete. The 1-, 3-, 7-, 14- and 28-day strengths of four different mixes of Grade 75 similar to 80 concrete, with or without pulverized fuel ash and/or condensed silica fume, under five different curing regimes were investigated. It is revealed that the curing conditions have significant influence on both the short term and long term strength development of the concrete and that concrete mixes of the same grade but containing different mineral admixtures show distinct favour for a curing regime. These results will be helpful for evaluating suitable curing methods for high strength concrete with different mix proportions.

关键词： curing condition high strength concrete strength development mineral admixture mix proportion

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The Creep Feature Analysis of The High Performance Concrete

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Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 113-115页

作者：苏骏 School of Civil Engineering and Architecture Wuhan University of Technology Civil Engineering Department Hubei University of Technology Wuhan 430068China

In order to seek the creep change rules of ased concrete with two different mix proportions, the test is carried out in the situation which is similar to that of the creation of concrete C60, and the creep test on the concrete of two different mix proportions is done under standard lab. Based on creep test of the high performance concrete, the creep degree and the creep coefficient are obtained. By comparing with the wide-adopted models of AC1209 （1997） and CEB- FIP MC90, it is found that the test result is good at its regularity and the research results offer reference to the calculating analysis of the on-the-spot experimental data.

关键词： high performance concrete mix proportion creep coefficient

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尾矿人工砂高性能混凝土研究

尾矿人工砂高性能混凝土研究

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全国高强与高性能混凝土及其应用专题研讨会

作者：宋少民北京建筑工程学院土木工程系

＜正＞一、前言我国目前处于规模空前的建设时期,混凝土用量非常大,不少地区优质砂资源出现匮乏,为满足建设需求,且寻找可持续发展的技术途径,不断拓宽商品混凝土用砂的砂源和品种,研究其在混凝土中的应用规律和方法是摆在混凝土科研和... 详细信息

＜正＞一、前言我国目前处于规模空前的建设时期,混凝土用量非常大,不少地区优质砂资源出现匮乏,为满足建设需求,且寻找可持续发展的技术途径,不断拓宽商品混凝土用砂的砂源和品种,研究其在混凝土中的应用规律和方法是摆在混凝土科研和企业技术人员面前的重要课题。各类尾矿砂、机制砂及其混合砂都是人工砂。尾矿是各类金属矿石、非金属矿石在进行分选、浓缩、提纯的过程中被当作废弃物被丢弃或进行有计划存放的部分。尾矿是我国产量、储存量最多的固体废弃物。据不完全统计目前全国积存的各类尾矿已达50多亿吨,

关键词： Tail mineral fine sand Manufactured sand High performance concrete mix proportion Durability

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Study on mathematical model of constitutive relation of ultra-long age plastic concrete under triaxial compression

Study on mathematical model of constitutive relation of ultr...

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第十一届南方计算力学学术会议（SCCM-11）

作者： Liangming Hu Xin Jia Changhui Zhang Danying Gao College of Water Resources and Environment Zhengzhou University North China University of Water Resources and Electric Power

This study aimed to establish a mathematical model of constitutive relation of ultra-long age(540 d) plastic concrete under true triaxial compression. The triaxial compression test with fixed lateral pressure of 36 sets of ultra-long age(540 d) plastic concrete cubes with different mix proportions was carried out. Based on the measured stress-strain curve of plastic concrete under triaxial compression with fixed lateral pressure, the equation of the elastic modulus of the plastic concrete is constructed, and the quartic polynomial mathematical model of the stress-strain relationship is established. The mathematical model curves of constitutive relationship of the plastic concrete under triaxial compression are in good agreement with the experimental measured curves. The establishment of the mathematical model provides a basis for the formulation of the plastic concrete specification and the numerical analysis and calculation of mechanical properties under triaxial compression, which is of reference value for the engineering application of plastic concrete.

关键词： plastic concrete constitutive relation triaxial compression mix proportion mathematical model ultra-long age

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RESEARCHES ON CRACK-PREVENTION TECHNIQUES OF FACE SLAB CONCRETE IN WULUWATI HIGH CONCRETE FACED SANDY GRAVEL ROCKFILL DAM

RESEARCHES ON CRACK-PREVENTION TECHNIQUES OF FACE SLAB CONCR...

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International Symposium on Concrete Faced Rockfill Dams

作者： CHEN Mingxi LI Yonggui LI Weiping Cao Shedang (Wuluwati Construction Administration Bureau) (Xinjiang Waterpower Research Institute) (Xinjiang Waterpower Engineering Supervision Center) (Quality Inspection Station of Shanxi Waterpower Engineering Bureau)

＜正＞The properties of shrinkage-compensating concrete made by adding expansion agent into concrete are introduced by taking the face concrete of Wuluwati concrete face sandy gravel dam for an example. Besides, construction experiences of reducing or preventing cracking by using the properties of shrinkage compensating concrete are introduced when concrete face slabs longer than 50-105m are placed continuously.

关键词： shrinkage compensating concrete mix proportion performance test

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