SU1235846A1 - Complex admixture for concrete mix - Google Patents

Description

one

This invention relates to compositions of additives introduced into a concrete mix.

The aim of the invention is to increase ductility, air entrainment and reduce the bulk density of concrete.

Three concrete mixtures are prepared, containing, in wt.%: Slag Portland cement M 300-25, the slag ash mixture (size 0-10 mm) is 75, the mixtures differ from each other in the content of MDR (technical lignosulfonate), sodium thiosulfate and aluminum sulphate in addition increasing respectively from 16 to 24%, from 36 to 59% and from 25 to 40%. The complex additive is introduced in the amount of 1% by weight of cement.

At the same time, in order to confirm optimality, two equal-level mixtures (workability 90 s) with the limiting content of the additive components, as well as one control mixture, which does not contain additives, are prepared. In addition, two equiplastic mixtures are prepared (a layered, proposed

To confirm optimality (exorbitant values)

Control (without additives)

ten

54- 10 54

25 10 25 10

35846 2

90 c) of a similar composition (g (is the ratio of cement and slag-ash aggregate) and two mixtures with the same initial W / C values, containing 5 the known complex additive, also in an amount of 1% by weight of cement. The mixtures differ from each other the content of MDB (lignosulfonate), sodium thiosulfate, sodium chloride, sodium sulfate and amino-containing compound (aniline) in the additive, increasing respectively from 10 to 54%, from 10 to 25%, from 9 to 25%, from 25 to 39, 9% and from 0.1 to 2.0%.

0

All mixtures were prepared in a mixer with a DI-effect for 3 minutes. Samples of 10x10x10 cm in size are formed from the mixtures by vibrating in standard mode to determine the bulk density and compressive strength of concrete. The samples are tested at the age of 28 days after steaming at a regimen of 3 + 10 + 3 hours.

The results of the studies are presented in the table.

39.9 25

39.9 25

Editor N. Egorova

Compiled by S. Voronin

Tehred O. Gortvay; Proofreader M. Demchik

Order 3056/20 Circulation 640, Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table continuation

Claims (1)

COMPLEX ADDITIVE FOR CONCRETE MIXTURE, including yeast sulphite mash, sodium thiosulfate and sulfuric acid salt, characterized in that, in order to increase plasticity, air entrainment and reduce the bulk density of concrete, it contains aluminum sulfate as the sulfuric acid in the following ratio of components, wt. %: Sulphite-yeast mash Sodium thiosulfate Aluminum sulfate ω 16-24 36-59 25-40 1 Nd 00 words □ about J ·· * ABOUT)