Types of shotcrete

In this article, we discuss the types of shotcrete. To buy and know the price of super lubricant, tile adhesive, anti-acid mortar, rebar planting adhesive, concrete restorer, epoxy and antifreeze grout, etc., you can contact Shimi Abadgaran company.

Types of shotcrete

Shotcrete is high-performance concrete or mortar that passes through a pipe hose and is spread over the back surface at a faster rate with the help of pressure. The force of this activity is the spraying that causes the concrete or mortar to compact and then at that point it makes the layers of concrete to the required thickness. Shotcrete is ultimately the best method for making curved surfaces.

Now it is much easier to develop tunnel linings and domes using shotcrete technology. It is a commonly recognized and used method for cementing materials of a cementitious nature for a wide range of applications. Since 1900, the year it was created by American taxidermist Carl Ackley, it has seen numerous improvements, both in gear and in the special methods required for pneumatic application of mortar or concrete.

Today, due to its adaptable fit, durable, high strength, high adhesion capacity, it has become an essential material, and it is effectively poured on a surface at high speed in troublesome spaces and is useful for operation. Its applications include slope and level insurance, to the reconstruction of existing structures.

Shotcrete

Shotcrete is usually applied to a grouted surface for reasons of protecting the surface which, if left untreated, will crumble or is unsuitable due to fracture and deformation. In the mining area, interest in shotcrete for underground support has been in high demand in recent years. Simultaneous operation of several heads, surprising fill conditions and difficulty in access are some of the issues that are undeniable for underground mining and require new and creative applications of shotcrete technology.

In most cases, there are two types of shotcrete technology, such as:

1. Dry mixed shotcrete (DMS)
2. Wet Mix Shotcrete (WMS)

Shotcrete dry mix

In this type of shotcrete process, the wet cement and sand mixture is transferred through a transfer hose pipe to a unique mechanical feed or gun called a transfer hardware. This mixture is transferred into the hose by the feeding wheel or merchant. This material is transported by the perforated complex with packed air, where the water is subjected to tension and mixed with various fittings. The mortar flew at high speed from the crater to the surface to be shotcrete. In this process, any change in the amount of water can be done without much tension by the nozzleman.

If the water content is higher, the concrete will generally flow vertically in flight. The amount of water should be varied so that the loss of returning material is minimized. The ratio of water to cement should be in the range of 0.33 to 0.50. Several types of hardware are available for Shotcrete with this process. The hardware, which ensures a constant inventory of mortar, can transport material 45 to 100 meters vertically and 300 to 500 meters horizontally.

Wet mixed shotcrete

In this type of shotcrete process, each of the aggregates such as sand, cement, water, and smaller coarse aggregates are mixed together before entering the hardware chamber. Ready-mixed concrete is metered into a hole in 7 environments, additional air is injected into the hole to increase the speed and work on the sample run. Equipment equipped with concreting can be accessed at a speed of 3.0 to 9.0 cubic meters per hour.

The surprise of a piece of mortar or concrete falling on the surface to be dealt with, due to the high speed of the flow, is called backlash and depends on the ratio of water to cement and its condition. Surface Treated The predicted range of rebound is 5.0% to 15% for horizontal slabs, 15% to 30% for vertical and sloped surfaces, and 20.0% to half for treating corners and overhead surfaces. Dry mixing process is preferred when using lightweight concrete.

A lower water-to-cement ratio is used, resulting in higher strength, less drying and creep shrinkage, and higher durability. Although in the wet process, higher durability can be achieved without excessive stretching by using air bubble specialists. When the water-cement ratio can be precisely controlled in the wet process, the wet process does not cause most problems. At the point where the larger limit accessible in the wet mixing process results in higher rates of concrete setting.

Applications of shotcrete

1. It is widely used in various constructions such as horizontal or vertical narrow surfaces, especially folded or curved sections, tank, channel and tunnel lining.
2. In addition, it is used in water retaining structures, swimming pools and prestressed tanks.
3. It has been used effectively in setting rock slopes and ensuring short cuts of newly discovered rock surfaces.
4. It is a means of ensuring against long-term corrosion of pilings, oil tanks, coal reinforcement, building steel frames and various building structures, just like structural steel coating for insulation.
5. These are manufactured for high temperature applications, such as the resistant lining of chimneys, furnaces, ovens, etc.

Shotcrete material

Cement, sand, water and aggregates are essential materials that are used in shotcrete along with various additives and softeners to improve its performance. A high water-to-cement ratio slows setting and affects final quality, while moisture content in sand or aggregates is measured accurately. The ideal water-cement ratio is about 0.45. The composition of sand or aggregate depends on water use, accelerators, workability, shrinkage, rebound and durability.

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