KING Shotcrete Solutions Group Announces New RS Shotcrete Products
King Packaged Materials Company is pleased to introduce three new products to the King Shotcrete Solutions portfolio: KING RS-D2 UG, KING RS ArmourGuard, and KING RS-D2 ST. As you will learn, these new products are powered by Rapid Set® technology and can reach a compressive strength of 20 MPa (2900 psi) in just 2 hours, under the proper conditions.
In the mining and tunneling industries, time is critical, and as the mining/tunneling cycle becomes shorter production increases. Shotcrete is often used for ground support when using the drill and blast method or other tunneling methods. But before re-opening access for the next phase of the underground heading, the applied shotcrete is required to reach a minimum compressive strength in order to ensure the safety of the workers going into the heading. In order to speed up the mining and tunneling process, has been working together with mines in Eastern Canada to develop a shotcrete mix design which meets the minimum required compressive strength as fast as possible. Using high early strength cement (Type III or Type HE) and a high accelerator dosage, it is possible to provide a shotcrete mix design capable of reaching early age compressive strengths of up to 7 MPa (1000 psi) at 4 hours. But to go over this previous limit, the cement technology needed to be reviewed. Working with calcium sulfo-aluminate (CSA) cement, the Rapid Set® Cement technology from CTS Cement, King has developed a research program to bring early age compressive strength gain to another level.
CSA cement sets very quickly and generates high early age compressive strengths. The main challenge when working with CSA cement is to mix and place the shotcrete or concrete mix before it sets. When water is mixed with any shotcrete or concrete mix made with CSA cement, the cement hydration process starts abruptly wherein the workability of the mixture decreases quickly but strength gain begins immediately after final set. By using a chemical retarder, it is possible to increase open time and workability but it also increases set time and delays strength gain. From the shotcrete technology perspective, the dry-mix process is the ideal choice. With technology used in the dry-mix shotcrete process, the shotcrete mixture is only mixed with water at the end of the transportation hose, at the nozzle, just prior to being shot onto the receiving surface. The mixture sets almost instantly in place and begins to gain strength. This makes the combination of the CSA cement technology with the dry-mix shotcrete process an ideal solution for reducing the mining and tunneling cycle, and ultimately resulted in the creation of three new products for our company.
KING RS-D2 UG is a rapid-hardening, pre-packaged shotcrete material for dry-process applications. This product is a pre-blended shotcrete material powered by Rapid Set® technology. It contains blended aggregated and other carefully selected components. KING RS-D2 UG has greatly enhanced shooting characteristics, providing greatly reduced setting times and very rapid strength development. This product is ideal for use in ground-support applications for mining, tunneling and other underground operations. KING RS-D2 UG is also designed for use in the construction of underground bulkheads, backfill barricades, pillars, ventilation walls and other underground concrete structures.
KING RS ArmourGuard is a specially formulated, rapid-setting, steel fiber reinforced, shotcrete mix designed to provide superior impact and abrasion resistant characteristics. This product is a pre-blended, pre-packaged, dry-process shotcrete material powered by Rapid Set® technology. It contains steel fibers, blended aggregates and other carefully selected components. KING RS ArmourGuard has greatly reduced setting times and very rapid strength development. This product is ideal for the construction of ore pass linings, ore pass brows, ore and rock chutes, or other areas of high impact and abrasion.
KING RS-D2 ST is also a rapid-hardening, pre-packaged, shotcrete material for dry-process applications. This product is a pre-blended shotcrete material powered by Rapid Set® technology. It contains steel fibers, blended aggregates and other carefully selected components. KING RS-D2 ST has greatly enhanced post-crack capacity, greatly reduced setting times and very rapid strength development. This product is ideal for use in ground-support applications for mining, tunneling and other underground openings.
To learn more about these new products, view the Technical Data Sheet for each product or contact your KING Technical Sales Representative.