METHOD OF PRODUCTION OF ITEMS OUT OF A CONCRETE MIXTURE Russian patent published in 2005 - IPC

FIELD: construction industry.

SUBSTANCE: the invention is pertaining to the field of construction industry, in particular, to the production of glass containers, in particular, to the methods of production of an items out of a concrete mix, which may be used in municipal landscape improvement of overall decor accomplishment of the modern town-planning in the form of the decorative fencing, lawns, roads, gardens in front of buildings, flower beds, at paving of territories and in other cases of the landscape design. The technical result is production of the items with a high strength, life duration, frost-resistance, increased chemical durability, watertightness, cement saving due to substitution of its optimum amount for microsilica. The method of production of an item our of a concrete mixture provides for preparation of concrete mixture by stirring of cement, sand, an pigment of organic or inorganic generation, C-3 superplasticizer and water with the subsequent laying of the concrete mixture in the form with an relief insert, placing the form on a molding table, compaction by vibration. At that they use sand with the grade modulus of Mgr-2.4-3.2. The concrete mixture is added with microsilica, and components take in the following ratio (in mass %): cement - 19.5-22.0, the indicated sand - 69.0-69.2, the indicated pigment - 0.7-1.0, C-3 superplasticizer - 0.1-0.21, microsilica - 1.0 3.4, water - the rest. At that first they stir the indicated sand and the indicated pigment for 45-50 seconds, then this mixture is added with the cement and microsilica and again the mixture is stirred during 60-70 seconds, then it is added with water with C-3 superplasticizer and the mixture is stirred for 120- 180 seconds, and compaction by vibration is carried out for 1-2 seconds with the subsequent simultaneous compaction by vibrations and pressure of 10-15 atm during 6-15 seconds. After that the newly formed item is placed in the chamber of the hygrothermal treatment with the temperature 0f 17-23°C and the relative humidity of 90-100 % and keep there for 15-20 hours. At that the form is made out of a steel and the figure inserts are made out of polyurethane.

EFFECT: the invention ensures production of the items with a high strength, life duration, frost-resistance, increased chemical durability, watertightness, cement saving due to substitution of its optimum amount for microsilica.

2 cl, 3 tbl, 1 ex