Study on Volume stability and Penneability of C80 Self-compacting Concrete
The alloy is used to pour piston, the piston itself strength σb =229 ￣ 245MPa,σb300℃ =95. 5MPa, volume stability ≤0. 025 %,these all are more advantage than the genetal piston alloy Zl108 and 66-1,so Al-Si-Ti alloy is a kind of ideal material for piston.
The mechanical properties and dimensional stability of PWC are significantly improved in comparison with that of plain timber. It is indeed a good method for timber modification and improvement of wood quality for fast-growing species.
With the demand of the engineering project and the development of the technology,concretes have been developed to get the high strength,high durability,and high mobility with physical volume stability.
This paper passes to introduce the reason that the high performance concrete opens , put forward the concrete physical volume stability of concept combine analytical it control the index sign, tallying up the exaltation concrete material anti function with keep concrete measure of the concrete physical volume stability.
Results show:corundum-mullite as porous ceramics material has high mechanical strengths, the good physical volume stability and uniform pore distribution. It can produce 30% porosity above depends on its construction and has fine permeability at the same time. It is the ideal material for melting super pure steel.
As for the effect of controlling the volume stability of mortars, PC>amp;gt;C-UNF>amp;gt;H-UNF.
The content of steel slag sand should be less than 50% according to the volume stability of blended mortar, and the dosage of clinker is about 10% based on the strength development.
Experimental results have shown that the application of lime and fly ash type "C" to high sulfate content tailings has improved its plasticity, workability, and volume stability.
In this study, these soils have been treated with a range of lime and sand contents to determine their effects on consistency, compactability, bearing and compressive strengths and volume stability against swell.
The use of both additives markedly improved the volume stability of all the soils against swell.
In addition, all of the modifiers, except UF-C-SiO2-polymer, improved the dimensional stability of poplar wood.
Three-dimensional stability analysis of the dam foundation at Baise
It is usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stability analysis if the safety factors of the different cross sections in the rock mass vary significantly.
A three-dimensional stability analysis method based on the upper-bound theorem was employed to solve this problem.
The results of an experimental investigation of the three-dimensional stability of a boundary layer with a pressure gradient are presented.