Search results

Today the large number of cement-based materials are need by humans engineering activities every year, such as cement grouting material with more than milion ton, so it hleps if those waste can be used to the cement-based materials.
The reason is: with an appropriate amount of Ca2+ and SO42- supplied by the dissolution of gypsum, the formation of ettringite slows down the hydration of C3A by creating a diffusion barrier around C3A grains,and then the fluidity increases.

Table 4 Physical properties of coarse aggregate Granular level (mm) Silt content (%) Clay lump (%) Needle sheet-shape grains content (%) Crushing value (%) 5～25 0.4 0.3 4.4 6.3 Water-reducing agent.
MIC-840-01 can not only automatically determine the air-void parameters of hardened concrete (such as the number of bubbles, the spacing factors, mean air void diameters and so on), but also manually separate the non-air-entraining bubbles from other bubbles for making quantitative description of the air-voids structure of concrete.

The cement particles are divided into three fractions[12]: the middle particle of 3~32um will play a major role on strength; less than the fine-grain pellet 3 um, its content should not exceed 10%; the coarse particles are greater than 60um, which do not work on strength, can only be used as a filling material.
Where ψ (Dp) is the number of accumulated screen residue which larger than Dp (volume fraction); De is the particle group more than 36. 8%; n is uniformity index.

Introduction Rheological properties of fresh concrete are one of the factors determining its use and depend on a number of variables, such as cement type, dose and type of plasticizing admixtures, type of aggregate, type of ingredients used, environmental temperature and finally delivery time of fresh concrete to the construction site [1], [2].
Cement grains and fine aggregates sediment at the bottom

Fungi have a wealth of esterification enzyme system，the enzyme of it can condense acetic acid and ethanol to ethyl acetate(fermented grains metabolic system).It also directly generate some complex metabolites distilled into wine, and affect the flavor and quality of liquor.[4-5].
Consistent with the metabolites in Czapek medium, but a relatively small number, while only alcohol and acid in the potato medium.

Therefore, in papers [6-8] special attention is paid to the creation of production technology and heat treatment of plates and sheets from aluminum-lithium alloys in order to weaken the anisotropy of mechanical properties by forming a homogeneous structure with an equiprobable grain distribution over crystallographic orientations (weakening or lack of texture).
The deformation of cast samples under upsetting conditions at the temperature of 400°C and the strain rate of 0.1 s-1 leads to the appearance of sufficiently sharp orientations of the deformation texture of the brass type {110}<112> and a number of other orientations (BS {011}<112> and Shear1 {001}<110>).

In a uniform carbon dioxide corrosion of carbon steels a great number of transport, chemical and electrochemical processes may occur.
The API N80 microstructure consists of acicular ferrite and bainite with carbides precipitated on grain-boundary.

Generalized hyperbolic distribution(GH) was introduced by Barndorff-Nielsen in 1977 when he studied the grain size distribution of wind blown sands[1].
Step 1 generate random sample (N=2819) from a pdf defined by normal distribution, generalized hyperbolic distribution , normal inverse distribution, hyperbolic distribution whose parameters listed in the table 3 had been estimation by patter search algorithm; Step 2 compute and according to the formula (4) and (5); Step 3 repeat step 1 and step 2 10000 times and we get 10000 and ; Step 4 Desending the above 10000 and ,then the 100-th number is the critical value of goodness of fit(10000*1%=100,1% is the significance level).

The heat treatment carried out cause in the solution treatment process solving in the solid solution of the big precipitations of the intermetallic phases, whereas during the ageing the homogeneous precipitation occurs of the dispersive intermetallic phases in the whole volume of the matrix grains.
Such structural state adds to the significant reduction of the number of locations in which corrosion centres may form.

The shape and grain size of the synthesized ZnO powder and sintered specimen were evaluated using SEM (Hitachi, Model- S-3700N, Germany).
Results and Discussion X-Ray diffraction (XRD): Internsity(a.u) 20 30 40 50 60 70 80 (1 0 1) (1 0 0) U0A100 U20A80 U80A20 U60A40 U40A60 U100A0 2θ (degree) ZnO - JCPDF Card number 36-1451 (0 0 2) (1 0 2) (2 0 2) (1 0 3) (1 1 2) (2 0 0) (2 0 1) (1 1 0) Fig 1.