Dry spraying method for heavy mortar

摘要

PROBLEM TO BE SOLVED: To provide a dry spray construction method for heavy mortar, enabling dry mix mortar to be transported a long distance by air flow and intended high density of the hardened dry mix mortar to be obtained.SOLUTION: Dry mix mortar 10 obtained by mixing cement, blast furnace slag fine powder, a binder 1 containing either an additive or chemical admixture, fine powder 2 containing iron sand with a density of 4.0 g/cmor larger and a grain diameter of 300 μm or smaller, and an aggregate 3 containing a metal ball with a density of 4.0 g/cmor larger and a grain diameter larger than 300 μm is transported toward a spray nozzle 30 using an air flow. Using the spray nozzle 30, mixed mortar 40 obtained by mixing the dry mix mortar 10 with water 20 is sprayed to a wall surface 51 that is an object of spraying to obtain heavy mortar 50.SELECTED DRAWING: Figure 1