1) natural sand
天然砂
1.
Properties of artificial sand and natural sand;
机制砂与天然砂的性能研究
2.
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。
3.
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。
2) natural sands
天然砂
1.
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
2.
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。
3.
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。
3) natural river sand
天然河砂
4) activated carbon
天然锰砂
1.
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
5) nature medium sand
天然中砂
6) natural gravel
天然砂砾
1.
The reliability of using the settle observed method to control the compacting of natural gravel roadbed is studied.
天然砂砾料是山区河道中丰富的自然资源 ,也是压实后稳定性良好的路基填筑材料 。
2.
The performance of natural gravel is studied by analyzing the mechanism.
通过对天然砂砾形成机理的分析,研究了其材料性能,借助试验和实践经验分析了新疆天然砂砾的级配、强度的特点。
3.
Thirdly, we studied the physical method which can improve the stability of silt, that is to use the local natural gravel to improve the performance of the silty soil, and study the different proportion of sand and gravel mixing, study the changes of the compression modulus and the CBR value, and determine the appropriate blending ratio.
首先,对该地区的低液限粉土进行一系列的室内试验,取得表征其物理、力学和化学性质的基本参数;其次,研究不同水泥剂量下,粉性土的无侧限抗压强度、抗压弹性模量和CBR值的变化情况,分析水泥稳定粉土的作用机理和影响因素,确定改良低液限粉土的合理水泥剂量;同时研究了物理改良稳定粉土的方法,即利用本地的天然砂砾进行掺配改良,研究掺加不同比例砂砾情况下,其抗压模量和CBR值的变化规律,确定合理的掺配比例,分析砂砾改良粉土的作用机理;最后,通过对不同改良方法的对比分析,确定利用砂砾改良粉土作为路基填料的实际改良方案;同时用MARC有限元软件仿真分析不同改良方案的工后沉降和路基稳定情况,进一步验证了不同改良方案的改良效果。
补充资料：石油天然气国际贸易(见石油市场与天然气市场)
石油天然气国际贸易(见石油市场与天然气市场)
石油天然气国际贸易(internotional tradeof011 and只as)见石油市场与天然气市场。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条