's Avatar

csacement June 18

csacement.com/products…

Description of Calcium aluminate cement
Calcium aluminate cement, alumina cements or high alumina cements are obtained by the reaction at high temperature of lime (from limestone) and alumina (contained in natural minerals like bauxite). The product obtained after cooling is a hard mineral: calcium aluminate clinker. Ground into a fine powder, the clinker becomes calcium aluminate cement (CAC) which forms a paste when mixed with water. This has the ability to harden very quickly: it forms a rigid solid within 24 hours.

Application of calcium aluminate cement
There are two distinct ways to use calcium aluminates: as high-performance binders and as mineral reagents in a variety of industries.
As binders, calcium aluminates are used in concretes and mortars for specialized applications for their properties of resistance to corrosion, abrasion and heat combined with rapid hardening and the ease of controlling grading variations.
Calcium aluminate cements are also used in combination with other fine components. Hydraulic binders with new properties are then obtained. In this way, aluminates act as both a complex hydraulic binder and a mineral reagent interacting with the other components in the mix.
As reagents, calcium aluminates are found in non-hydraulic systems. This is the case in metallurgical treatments (iron and steel industry, foundry) where specific grades of calcium aluminate are used for their low-temperature melting properties and for trapping molten metal impurities.
Calcium Aluminate Cement CA50 specification:
Index Item
CA50-625 CA50-725
Al2O3, % ≥50, <60 ≥50, <60
SiO2,% ≤8.0 ≤8.0
Fe2O3,% ≤2.5 ≤2.5
Specific surface area, m2/Kg ≥300 ≥300
Setting time
Initial setting time,min
Final setting time,h ≥30
≤6 ≥60
≤8


Compression strength , MPa
1d
3d 40
50 64.7
71.1


Bending strength, MPa
1d
3d 5.5
6.5 6.9
7.4

Calcium Aluminate Cement Construction method:
1. When preparing refractory concrete, fix on the aggregate according to using condition. Choose the proper capacity graduation to make maximum density. Be noted to match and adapt with cementing material.
2. According to certain proportion, add water and mix by man or machine into mortar and then begin casting construction. Use up the ready mortar within 40 min. Calcium Aluminate Cement’s hydration heat concentrate on early stage. Casting thickness should not exceed 3 cm each time. Water curing immediately when concrete goes hardening and the curing time should not less than 3 days.
3. When prepare expanding cement, Calcium Aluminate clinker’s dosage is 73-76%, CaSO4·2H2O dosage is 24-27%. When prepare self-stressing cement, the mixing ratio of CaSO4·2H2O should be increased.

Calcium Aluminate Cement Notice:
1. In order to avoid uncontrollable setting time, do not mix with Portland cement, lime etc of which separate out calcium hydroxide cementing material. Before use, clean all the mixing machinery.
2. Steam curing to accelerate concrete’s hardening. The curing temperature should not higher than 50℃.
3. Refractory concrete’s late strength decline big, design should according to the lowest stable strength. CA-50 bonded concrete’s lowest stable strength should be determined by the lowest strength of 7-14 days of demoulding sample curing in 20℃±1℃ water.

Calcium aluminate Cement Packing:
by 50kgs bag. Store in shady, cool and dry place. Avoid stamp and mix with other substance.

Where to Buy Calcium Aluminate Cement
We are professional in high alumina cement manufacturing process and produce excellent Calcium Aluminate cement, high alumina cement and high temperature alumina cement supplier, please feel free to contact us.
Oreworld trade (Tangshan) co., Ltd. has been engaged in exporting business for about 20 years. We are dealing in fields of special cements, refractory materials and ore products.
For the special cement products, it includes calcium aluminate cements (CA cement) and calcium sulfoaluminate cements (CSA cement/CSA binder). The CSA cement is more and more imported by GRC manufacturers and dry mix mortars manufactures because of its higher performance compare to the Portland cement such as fast setting time, rapid hardening and high strength in 3 days. It is also widely used in bridge building the highway building and cold weather concreting.
Our exporting quantities for the CSA cement and calcium aluminate cement is around 30000 mts per year.


#high #alumina #cement #properties

  • Calcium aluminate cement via csacement

Avatar



's Avatar

atechmagnet May 11

In fact, magnetic materials can be seen everywhere in our life, such as Fe3O4, that is, rust. It is a natural magnet can be seen everywhere in our life. In our industrial production, magnetic materials are extensively and ubiquitously applied. For instance, a generator for power generation, a transformer for power transmission, a motor for cars, and a telephone we use to make phone calls at ordinary times are all common things in our daily life, which cannot be produced without magnetic materials. It can be proved that our industrial manufacture cannot be separated from magnetic materials. Because many devices and equipment need coil structures, without magnetic materials we cannot electrify modern life, and our life will lack fun in a large amount. This shows the importance of magnetic materials to traditional industries.

In fact, a lot of medical equipment are also made of magnetic materials. For example, in medicine, we can diagnose abnormal tissues of human body by observing magnetic resonance imaging, a technology we are familiar with, so as to diagnose diseases.

With years of development, great progress has been made in the research of bio-magnetic materials. Although many bio-magnetic materials are still in the testing stage, I believe that in the near future, with the development and progress of bio-engineering, material engineering and biomagnetism, the magnetic properties of materials will be more widely used in clinical trials, thus making greater contributions to the development of medicine.

The 21st century is an era of rapid development of science and technology. On the basis of high technology, the strength of a country's military is related to the country's international status. A country's strong military strength means that the country is in an invincible position in economy, culture and other aspects. Magnetic materials are also widely used in military affairs, such as the use of radar and electromagnetic guns. Magnetic materials can be said to have contributed to enhancing the military strength of various countries.

atechmagnet.com/magnet…

#magnetic #properties #of #materials

  • In fact, magnetic materials can be seen everywhere in our li... via atechmagnet

Avatar



's Avatar

Multi Lab May 6

Glass holds great history and the uses and #methods to make it have developed over the time. If we talk about #quartz_glass, it is a unique #material, as it has unique #properties such as high purity level of silicon dioxide and its mechanical, thermal, electrical, optical and #chemical_properties.
multilabuk.blogspot.co…

Avatar