| abstract |
The present invention relates to 100 parts by weight of Portland cement, sand having a single particle size of D10 to D90 of 0.063 to 5 mm or D10 to D90 of finest fine sand of 0.063 to 1 mm, and D10 to D90 of coarsest coarse sand. 1 to 4 mm, 50 to 200 parts by weight of a mixture of sand (preferably two types of sand), 10 to 50 parts by weight of particulate matter which is a substantially non-pozzolanic material having an average particle size of less than 15 μm, high Provided is a concrete having a 28-day compressive strength of 100 Mpa or more, which contains 0.1 to 10 parts by weight of a water reducing agent and 10 to 30 parts by weight of water and is substantially free of silica fume. |