SU1204593A1 - Additive to concrete mix - Google Patents

Description

one

The invention relates to construction, in particular to the production of concrete mixtures, including modifying additives.

The purpose of the invention is to prevent the separation of the mixture, increasing the air content and frost resistance of concrete.

The proposed surfactant additive is intended to be incorporated with the mixing water.

The technology of preparation of solutions from LHD is similar to the technology of preparation of RDB solutions. The introduction of LHD and SDB solutions into the concrete mixture can be performed through the same dispenser.

Additive LCD is obtained by neutralizing a soluble resin (a mixture of phenols) with aqueous solutions of caustic soda and calcium hydroxide.

One stripped off of the soluble resin through the dispenser is fed into the reactor with a stirrer, then dispensed with a suspension of Ca (OH), j + NaOH.

As a result of the neutralization of the resin, a black viscous liquid is obtained, containing, in wt%:

Calcium and sodium phenol ty25-30

Calcium and sodium salts of phenolic acids 10-15 Calcium and sodium salts of hydroxy acids 5-8

6.0

Calcium and sodium salts of carboxylic acids 5-7 Levoglucosan 30-35

To compare the properties of the concrete sample samples with the proposed and known additives, concrete mixtures were prepared, including: Portland cement M 400 (Cr, and), sand c, 4l and the content of dust, clay and clay particles (determined by grinding) in an amount of 2.1% , crushed stone fraction 5–20 and 20–40 mm with a ratio of 50:50 with water absorption of 1.1 and 0.5%, respectively, and crushability of 12.2 and 14.4%.

Comparison of the properties of additives was carried out on equally mobile concrete mixes with a draft of 4-6 cm with the same cement consumption equal to 300 kg / m. The same mobility of concrete mixtures was achieved by changing the water-cement ratio. All additives were introduced into the concrete mix with mixing water.

In this case, the dosage of additives was taken: for PFLH - 0.05 j 0.2 and 0.5% by weight of cement; for SDB and LHD, respectively, 0.1 and 0.5% and 0.02 and 0.1%. The dosage of additives was made in terms of dry matter.

The compositions of concrete mixes with additives and properties of concrete mixes and concrete are presented in the table.

Not

10.6 26.9

600

Cement Sand Rubble SDB LHD Water

Cement Sand Rubble SDB LHD Water

Cement Sand PFLH Crushed Water

Cement Sand PFLH Crushed stone

Water

Cement

Sand

Rubble

Water

12.7 33.1 47.6 0.025 0.005 6.57 12.9 33.0 47.792 92 0.072 0.003 6.533 12.8 33.5 46.994 0.006 7.5 12.9 33.2 46.6 0.026

7.274 12.5

32.1

47.9

7.5

VNIIPI Order 8487/23 Circulation 604 Subscription Branch PPP Patent, Uzhgorod, Proektna St., 4

Table continuation

4.5 No

8.5

30.1

500

4.5 No

7.3

31.7

400

6.0 No

1.5

26.5

100

4.5 No

4.7

28.5

150

8.0 There are 1.2

27.0

50

Claims (1)

CONCRETE MIXTURE ADDITIVE, including a surfactant, is a product of the chemical industry based on phenol derivatives, characterized in that, in order to prevent water separation of the mixture, increase the air content and frost resistance of concrete, it also contains a sulfite-yeast mash, and as a surface-active the substances of the product of a chemical production based on phenol derivatives — a chemical chemical additive of LHD in the following ratio of components, wt.%: Sulphite-yeast mash Forest Chemical Additive LHD