Effect of difference between thermal and setting expansion rate of the investments on the precision of castings
包埋材料热膨胀率和凝固膨胀率变化对铸件铸造精度影响的研究
Methods The setting expansion rate of GC Cristoquick Ⅱ gypsum-bonded investment was measured with a setting expansion tester 30,60,120 min after mixing the material respectively.
方法采用CristoquickⅡ石膏基快速包埋料,测量材料从调拌结束至调拌完成后2h内的凝固膨胀率,以及材料在调拌后分别放置30、60和120min后采用快速和常规加热法处理的热膨胀率,然后计算包埋料的总膨胀率。
5～9min,the setting expansion was 0.
5 -9min ,凝固膨胀率 2h后为 0 。
According to the design and construction of undesirable tunnel geology,it summarizes common undesirable geology reaction in tunnel design and construction such as expansive ground pressure,landslide,loose bottom,and discusses their features,processing principles,attentions and common processing measures,so as to guarantee the smooth proceeding of tunnel construction.
针对不良地质隧道的设计与施工,总结了隧道设计与施工中常见的膨胀性地压、滑坡、松散地层等不良地质反应,并对其特征、整治原则以及应考虑的问题和采取的常用处治措施进行了探讨,以确保隧道施工的顺利进行。
The relationships between strength indexes c, ? and dry density γ d,degree of saturation sr,water content ω, strength and swelling pressure p of expansive soil are researched.
研究了膨胀土的强度指标c,?与含水量ω、干密度γd及饱和度sr的关系,以及强度与膨胀压力p之间的关系,结果表明:c,tan?和γd,sr,ω的关系与膨胀压力p和γd,sr,ω的关系相似;任何状态的膨胀土的强度,皆可表示为饱和状态的强度和吸力引起的,并可用不同状态土的膨胀压力表示的附加强度两部份。
The variation regularity of swelling pressure p and expansion ratio50dunder 50 kPa pressure with dry densitydr,degree of saturationrsand water content w were investigated.
研究了击实膨胀土的膨胀压力p与50 kPa下的膨胀率50d随干密度、饱和度及含水量的变化规律。
Laboratory tests and field borehole tests show that the swelling pressure in borehole is higher than that obtained from laboratory tests.
室内和原位膨胀试验结果表明，现场原位测试压力明显比室内试验值高，比较室内和原位测得的参数可知，膨胀机理和环境因素对膨胀均有影响，微裂隙、水压力、钻孔周围膨胀影响带的厚度及地应力均对膨胀压力和膨胀量有影响。
Using the method of recompression after the soil specimen swelling freely, water influencing upon expansive deformation and expansive pressure was studied.
采用自由膨胀加荷法研究了水分对膨胀变形与膨胀压力的影响，表明膨胀变形与膨胀压力均与试前含水量呈显著的线性负相关，而膨胀变形与膨胀压力存在显著的线性正相关。
The static cracking agent(SCA) is a new kind of cracking material using expansive pressure to cut or crack concrete, rock and other precious brittle solid materials .
试验研究及检测结果表明,所开发的静态破碎剂反应速度快,膨胀压力大,耐侯性好。
The static cracking agent (SCA) is a new kind of cracking material using expansive pressure to cut or crack concrete, rock and other preci.
其次对静态破裂剂的作用原理和膨胀性能进行了理论分析，同时对静态破裂剂的膨胀压力进行了测试和分析，并且对其比重、容重进行了测定。
Effect of difference between thermal and setting expansion rate of the investments on the precision of castings
包埋材料热膨胀率和凝固膨胀率变化对铸件铸造精度影响的研究
Water also expands upon freezing, unlike most materials.
与大多数物质不同，水凝固时也要膨胀。
Effect of Ce on the solidification structure of Fe-Ni base Invar expansion alloys
Ce对Fe-Ni膨胀合金凝固组织的影响
Effect of Nb metamorphic disposal on solidification structure of Fe-Ni base invar expansion alloy
Nb变质剂对Fe-Ni膨胀合金凝固组织的影响
The phenomenon whereby a viscous substance solidifies under pressure.
膨胀凝固性一种粘性物质在压力下变成凝固的现象
alunite expansion agent for concrete
明矾石混凝土膨胀剂
expansive cement concrete pavement
膨胀水泥混凝土路面
Research on Expansive Performance of Expansive Agent in Steel Tube Concrete;
膨胀剂在钢管混凝土中的膨胀作用研究
Research of Double Expansive Sources Admixture for Hydraulic Mass Concrete;
水工大体积混凝土双膨胀源膨胀剂的研究
Influence Factor of expansion rate of cementitious material added by expansion admixture
掺膨胀剂水泥基胶凝材料膨胀率的影响因素
Research on the Material Design of Square Expansive Concrete-Filled Steel Tubular Members;
用于方钢管膨胀混凝土构件的膨胀混凝土材料设计研究
The expansion of the steam in the cylinder causes some of the steam to condense. (=When the steam expands in the cylinder some of the steam condenses.)
蒸汽在汽缸中膨胀时，部分蒸汽冷凝。
Research of Expansive Admixture s Effectiveness in High Performance Concrete;
高性能混凝土膨胀剂效用的试验研究
Actuality and Developing Direction of Expansive Agents Industry for Concrete
混凝土膨胀剂行业的现状和发展方向
Effect of Overdose SO_4~(2-) of Expansive Agent on Concrete Property
膨胀剂中过量SO_4~(2-)对混凝土性能影响
Research on Properties of C50 Mangnesium Oxide Micro-expanded Concrete
C50氧化镁微膨胀混凝土的性能研究
INFLUENCE OF AGGREGATE SIZE ON THERMAL EXPANSION PROPERTY OF CONCRETE
骨料粒径对混凝土热膨胀性能的影响
low-expansion foam fire extinguishing system in machinery space
机器处所的固定低膨胀泡沫灭火系统