High Strength and Lightweight Castable

High-strength lightweight castables use high-purity, well-sintered, low-water-absorption high-aluminum lightweight aggregates, calcium aluminate cement and imported micropowders, intermediate media and high-efficiency admixtures as raw materials. Various micropowders are required to be of high purity and fine particle size, and the intermediate medium 2P is required to have a small volume density and a particle size of <0.5mm. By adopting reasonable particle grading, using micropowder technology and suitable intermediate media, high-strength lightweight castables that meet the use requirements are developed. Calcium aluminate cement has high low-temperature strength and long setting time, which is conducive to construction. The castable has been well received by customers for its excellent construction performance and use effect.

Send Inquiry

Description

In the preparation of lightweight refractory castables, the refractory aggregate is mainly clay porous clinker, the firing quality is improved, and the particle grading tends to be reasonable, so the performance of the castable can be improved; the binder is 625 CA-50 cement, which reduces the dosage, generally 20%~30%, and increases the alumina clinker powder; in order to improve the sintering performance of the refractory castable and reduce its linear shrinkage after firing, soft clay and kyanite and other additives can be added, generally in an amount of 3%~10%. At the same time, additives such as water reducers are also added to reduce the water consumption of the castable to 17%~25%. After adopting these technical measures, the preparation process is basically the same, the cost increase is not much, but the performance is greatly improved.

The characteristics of its high-strength lightweight castable are light weight, hard shell, high strength and many internal honeycomb holes. The bulk density of ceramsite less than 10mmn is 410~500kg/m³, the cylinder pressure strength after pressing down 2cm is 2.2~2.8MPa, the water absorption rate is 4%~8%, Al20319%~21%, and the refractoriness is 1280~1320℃. Since the bulk density of shale ceramsite is low and it is raw ceramsite, it can be prepared into high-strength lightweight castables with low bulk density, but the maximum use temperature is 1200℃. In the preparation process of high-strength lightweight castables, 525 or 625 CA-50 cement is used as a binder, the sintering agent is soft clay, and the refractory powder is alumina clinker powder. In order to reduce the bulk density and thermal conductivity, some expanded perlite and floating beads are added. Adding admixtures greatly improves the performance.

Main physical and chemical indicators of high-strength lightweight castables

project		HX-LH0.8	HX-LH1.0	HX-LH1.3
Bulk density (g/cm³)		0.8	1.0	1.3
Compressive strength (MPa)：≥	110°C x16h	4	6	9
	800°C x3h	4	6	9
Line change rate (%)	1000°C x3h	0~-0.8	0~-0.6	0~-0.6
Thermal Conductivity 350℃[W/(m·K)]: ≤		0.22	0.25	0.4
Long-term use temperature (℃)		1000	1000	1000

Hot Tags: high strength and lightweight castable, China high strength and lightweight castable manufacturers, suppliers, factory, 60 Self flowing Castable

Lightweight Castable

Anchor Bricks