SU1627537A1 - Method for preparing concrete mix - Google Patents

Abstract

The invention relates to methods for preparing a concrete mix used in hydraulic engineering and road construction for the manufacture of products from highly mobile concrete and to stabilize the increase in early strength. The purpose of the invention is to improve the plasticity and stabilize the increase in the early compressive strength of concrete. The mixing water is preliminarily deaerated followed by magnetization, mixed with cement in a turbulent mixer at a speed of 320–340 rpm for 0.7–1.6 min, and polymer-phenol-2 is introduced in a quantity of 0.05–0. , 15% PSG & HI by weight of cement, mixed with in-aqueous sodium hydroxide solution, respectively, in a ratio, and the activated binder is introduced into the mixed aggregates (sand and crushed stone). 1 tab. % (L

Description

The invention relates to construction, to methods for preparing a concrete mix used in hydraulic engineering and road construction for the manufacture of products from highly mobile concrete and to stabilize the increase in early strength.

The purpose of the invention is to increase the plasticity and stabilize the increase in the compressive strength of concrete in the early stages of hardening.

Example 1

Concrete mix contains, mac

Cement1

Sand0.87

Rubble2,1

Water0,41

The starting material for the preparation of the concrete mix is cement of grade 500, aggregates - crushed stone of fraction 5–20 mm, sand as a grain size module 2.1.

Example 2. A concrete mixture is prepared on the basis of low-alkaline portland cement, the dry components of which are closed with water previously deaerated in a vacuum chamber at a pressure of 20 mm Hg. followed by magnetization by permanent magnetization in a 5 mm gap with a strength of 120 mt.

Etc. and measure 3. The preparation of concrete mixture based on low-alkaline portland cement is carried out by mixing cement with water in a turbulent mixer at a speed of 320– 340 rpm for 1 minute, and then combining the cement binder with aggregates (sand and rubble)

EXAMPLE 4 A water-alkaline solution (0.15% sodium hydroxide and 0.15% powdered polymerphenol based on the weight of cement) is introduced into the concrete mixture on low-alkaline portland cement 7 minutes after mixing with water. for 3 minutes

EXAMPLE 5 A concrete mixture based on low-alkaline portland cement is produced in a turbulent mixer at a speed of 320–340 rpm by mixing cement with water previously de-aerated in a vacuum chamber at a pressure of 20 mm Hg, followed by magnetization. a permanent magnet in the gap of 5 mm, with a strength of 120 mt, for 1 minute and then combining the cement binder with aggregates.

EXAMPLE 6 A concrete mixture based on low-alkaline portland cement is carried out by mixing cement with water previously de-aerated in a vacuum chamber at a pressure of 20 mm Hg. followed by magnetization by a permanent magnet in a gap of 5 mm and a strength of 120 mt in a turbulent mixer at a speed of 320-340 rpm for 0.7-1.0 minutes, Injected in the amount of 0.05% by weight of cement mixed with an aqueous solution of caustic soda in the ratio of 1: 0.4, calculated on the dry matter, which in the same mixer is mixed for 0.5-1.0 minutes. Next, the combination of activated binder with alternate {{and ::: sharnnels) for 1.0- I, 5 minutes,

Example 7. Preparation of concrete mix. 1.0 to example 6 with the amount of polymersens 0.1% by weight of cement, mixed with an aqueous solution of caustic

soda in the ratio of 1: 0.4 in terms of dry substance.

PRI me R 8. Preparation of the concrete mix according to example 6 with the amount of polymerphenol 0.15% by weight of cement, mixed with an aqueous solution of caustic soda in the ratio of 1: 0.4, calculated on the dry matter.

When used as an additive of an aqueous alkaline solution of polymeric phenol, the water introduced with the additive is taken into account when calculating the amount of water necessary for mixing the concrete mix.

The results of testing the concrete from these mixtures for mobility (sludge cone), compressive strength and density (for water absorption) are given in the table.

Claims (1)

Invention Formula The method of preparing a concrete mix by mixing low-alkaline cement, aggregate, ground water, an additive — an aqueous solution of a polymer-phenol of the formula OH 1 and caustic soda, and xx Js- "the amount of the latter is 0.05-0.15% by weight of cement differing so that, in order to increase the plasticity and stabilize the increase in the compressive strength of concrete in the early stages of hardening, the mixing water is preliminarily deaerated and then magnetized, then the activated water with cement is displaced into the turbulent ohm mixer with a frequency of 320-340 rev / min for 0.7-10 minutes, then the specified additive is added, in which the ratio of polymeric phenol and caustic soda is 1: 0.4 and the mixing is continued for 0.5-1E minutes and then mixing the obtained into the slurry with filling for 1.0-1.5 minutes.