Rock powders are used as admixture to the natural sands for roller compacted concrete of Jinghong hydroelectric project;
景洪水电站碾压混凝土天然砂的级配改善措施
Two lab-scale Constructed Rapid Infiltration Systems (CRI) have been designed to treat bath wastewater by using natural sands for seven months.
以天然砂作为主要渗滤介质处理洗浴污水的试验研究的结果表明,在相同的水力负荷条件下,采取2种明显不同的水力负荷周期运行,人工快渗系统对洗浴污水的污染物去除效果具有明显的差别,通过缩短水力负荷周期,提高了人工快渗系统的复氧效率,增大了水在系统中的停留时间,快渗系统的污染物去除效果得到了明显改善。
In the light of the low Hydraulic Loading of traditional wastewater rapid infiltration land treatment system, a experiment project of building Constructed Rapid Infiltration (CRI) system by using natural sands is put forward.
针对传统污水快速渗滤土地处理系统水力负荷低,占地面积大的弱点,提出了采用渗透性能良好的天然砂作为主要渗滤介质建立人工快速渗滤系统的试验方案,并以受污染河水为研究对象进行了为期一年的现场试验研究。
Properties of artificial sand and natural sand;
机制砂与天然砂的性能研究
Through comparison of the applying effects of man-made and natural sand in slurry and concrete,it shows man-made sand could take place of natural sand and can improve the durability and hardness of slurry and concrete.
通过人工砂和天然砂在砂浆和混凝土中的使用效果对比,说明采用人工砂替代天然砂,可以提高砂浆和混凝土的强度及耐久性,从而得出人工砂是配制砂浆和混凝土理想细骨料的结论。
In this paper,the influence of natural sands,manufactured-fine aggregates and micro-fines in the manufactured-fine aggregates on some performances of highstrength concrete was tested by the method of contrast,which included workability,compressive strength,Young s modulus,drying shrinkage and creep.
采用对比的方法,研究了天然砂、机制砂及机制砂中的石粉质量分数对高强混凝土的工作性、抗压强度、弹性模量、干缩和受压徐变的影响。
Treatment of zinc plating wastewater by the mixture of activated carbon and nautural maganess oxide;
活性碳—天然锰砂混合处理镀锌废水的初探
Thus, the mineral crystalline morphology of natural silica sand is an important parameter for use in foundry.
矿物晶体形态是铸造用天然硅砂的一个重要物理参数。
The mineral crystalline morphology of foundry natural silica sands has been investigated, which can be divided into two groups: single crystal and polycrystalline gather.
考查了铸造用天然硅砂的矿物晶体形态，可将其大致分为单晶体和多晶集合体两类。
Natural Resources: bauxite, coal, crude oil, iron ore, natural asphalt, calcium, silica, mica, salt, clays.
自然资源：铝矾土、煤、原油、铁砂、天然沥青、石灰、硅石、云母、盐、粘土。
Strontium and Metasilicate Natural Mineral Water of Beizhang Village in Baoding,Hebei
保定市北章村锶－偏硅酸天然矿泉水
Determination of Mercury Content in Natural Gas by Chemisorption on Iodine -Impregnated Silica Gel
碘浸硅胶吸附法测量天然气中汞含量
Feasibility Analysis on The Low Label Concrete Using Mechanism Sand Instead of Natural Sand
低标号混凝土采用机制砂代替天然砂可行性分析
The Research on the Performance of Artificial Sand High Performance Concrete and Natural Fine Sand Concrete
人工砂高性能混凝土和天然细砂混凝土的性能研究
Technical specification for application of natural zeolite powder in concrete and mortar
天然沸石粉在混凝土和砂浆中应用技术规程
PHASE EQUILIBRIUM IN PRODUCING BORIC ACID FROMPROCESSING NATURAL BORAX BY SULFURIC ACID
硫酸加工天然硼砂矿生产硼酸的相平衡
Treatment of zinc plating wastewater by the mixture of activated carbon and nautural maganess oxide
活性碳—天然锰砂混合处理镀锌废水的初探
Fractal Structurel of Granularity Distribution of Natural Sedimentary Sandy Gravel
论天然沉积砂卵石粒度分布的分形结构
Natural Grit Enlarged Compaction Pile by Tamping Applied in Highway Engineering
天然砂砾夯扩挤密桩在公路工程中的应用
Characteristic Comparison of Alkali-Aggregate Reaction for Recycled Fine Aggregate and Natural Sand
再生细骨料与天然砂碱骨料反应特点比较
Application of Green Sand Casting Process of Yellow Loam Natural Clay-Bonded Sand
黄壤土天然粘土砂湿型铸造工艺的应用研究
A white or grayish opaline siliceous deposit formed around natural hot springs.
硅华一种形成于天然温泉周围的白色或浅灰发乳色光的硅沉淀物
A natural beryllium silicate, Be2SiO4, occurring as vitreous crystals sometimes used as gems.
硅铍石一种天然铍硅酸脂，Be2SiO4，以玻璃晶体出现，有时用作宝石
chemical analysis of silica sand and quart
硅砂和硅石化学分析方法
Study on the Ultragrind and the Physical Properties of the Natural Wollastonite about Faku;
法库天然硅灰石的超细粉碎与物性研究
