Mortar composition for spacers and mortar

Abstract

To provide a mortar composition for a spacer and mortar that can produce a high-strength reinforcing bar spacer by combining specific materials.SOLUTION: A mortar composition for a spacer of the invention contains Portland cement, lightweight fine aggregate, pozzolanic fine powder, inorganic carbonate, and a high-performance water reducing agent, and when hardened with water, the compressive strength at 28 days of age is at least 100 N / mm2.SELECTED DRAWING: None

Claims

[Claim 1] It contains Portland cement, lightweight fine aggregate, pozzolanic powder, inorganic carbonate, and high-performance water-reducing agent. For every 100 parts by mass of Portland cement, the mixture contains 5 to 15 parts by mass of lightweight fine aggregate, 5 to 15 parts by mass of pozzolanic powder, and 1 to 5 parts by mass of inorganic carbonate. The high-performance water-reducing agent is present in an amount of 0.5 to 3.0% of the total spacer mortar composition. The compressive strength at 28 days of age after curing with water is 100 N / mm². ２ That's all. The aforementioned lightweight fine aggregate is perlite, The water absorption rate of the aforementioned perlite rock is 70-100%. A mortar composition for spacers, wherein the maximum particle size of the perlite is 1,000 μm or less. [Claim 2] It contains Portland cement, lightweight fine aggregate, pozzolanic powder, inorganic carbonate, and high-performance water-reducing agent. For every 100 parts by mass of Portland cement, the mixture contains 5 to 15 parts by mass of lightweight fine aggregate, 5 to 15 parts by mass of pozzolanic powder, and 1 to 5 parts by mass of inorganic carbonate. The high-performance water-reducing agent is present in an amount of 0.5 to 3.0% of the total spacer mortar composition. The compressive strength at 28 days of age after curing with water is 100 N / mm². ２ That's all. The aforementioned lightweight fine aggregate is perlite, A mortar composition for spacers, wherein the unit volume mass of the mortar before water is added and hardened is 1.9 kg / L or less. [Claim 3] It contains Portland cement, lightweight fine aggregate, pozzolanic powder, inorganic carbonate, and high-performance water-reducing agent. For every 100 parts by mass of Portland cement, the mixture contains 5 to 15 parts by mass of lightweight fine aggregate, 5 to 15 parts by mass of pozzolanic powder, and 1 to 5 parts by mass of inorganic carbonate. The high-performance water-reducing agent is present in an amount of 0.5 to 3.0% of the total spacer mortar composition. The compressive strength at 28 days of age after curing with water is 100 N / mm². ２ That's all. The aforementioned lightweight fine aggregate is perlite, A mortar composition for spacers in which, after being mixed with water and cured underwater, the unit volume mass of the mortar at 28 days of age is 2.1 kg / L or less. [Claim 4] The mortar composition for spacers according to any one of claims 1 to 3, wherein the pozzolann fine powder is acidic silica fume. [Claim 5] The mortar composition for spacers according to any one of claims 1 to 4, wherein the inorganic carbonate is calcium carbonate. [Claim 6] The mortar composition for spacers according to any one of claims 1 to 5, wherein the high-performance water-reducing agent is a polycarboxylic acid-based water-reducing agent. [Claim 7] A mortar composition for spacers according to any one of claims 1 to 6, comprising at least one of glass fibers and polypropylene fibers. [Claim 8] The compressive strength at 1 day after curing with water added is 65 N / mm². ２ The mortar composition for spacers according to any one of claims 1 to 7. [Claim 9] The compressive strength at 3 days after curing with water added is 80 N / mm². ２ The mortar composition for spacers according to any one of claims 1 to 8. [Claim 10] The compressive strength at 7 days after curing with added water is 90 N / mm². ２ The mortar composition for spacers according to any one of claims 1 to 9. [Claim 11] A spacer mortar composition according to any one of claims 1 to 10, and water, A mortar in which the total amount of water and high-performance water-reducing agent relative to the entire spacer mortar composition is 15 to 25%.

Images