SU787446A1 - Injection solution for concrete thickening - Google Patents

Description

one

The invention relates to construction, in particular to compositions used to increase the density of concrete in products and structures, mainly in hydraulic engineering and underground, in order to eliminate water filtration in them.

A known solution for compaction of fractured concrete, Ei-lyuchayuschy aqueous suspension of cement fl.

The lack of cement mortar limited the permeability of the solution in the filtering concrete.

The closest to the invention in its technical essence and the achieved result is an injection solution comprising an aqueous solution of a carbamide resin with a density of 1.151, 07 g / cm and 4-6% oxalic acid. The amount of oxalic acid is 10-30% by volume of resin 2

However, when using this composition, it is necessary to pretreat the filtering solution by injecting oxalic acid into it and only then inject the urea resin with a hardener due to the need to create a protective calcium oxalate layer on the surface of the pores and cracks of the concrete. Another disadvantage is permeation deterioration; capacity of concrete as a result of filling the gas with micro- and macrocage: carbon dioxide carbon dioxide emitted during

5 Pretreatment of concrete with conductive acid / d.

The purpose of the invention is to prevent gassing in the pores of the concrete, increasing the ssatite strength of the concrete and

® adhesion of the injection solution to the concrete surface and simplification of the technology.

This is achieved by the fact that an injection solution for compacting concrete, which includes an aqueous solution of a carbamino resin with a density of 1.15-1.07 g / cm and oxalic acid, additionally contains sodium oxalate in the following ratio of components, parts by weight: Aqueous solution of urea resins

Density 1.15-1.07 g / cm 100% Chaabelic acid 5-30 25 Sodium oxides 0.05-0.25 Tab. Tables 1 and 2 show the results of studies of the effect of sodium oxalate on the strength of a carbamide resin gel and the strength of limestone aggregate fixed by it, as well as adhesion to the concrete surface of the resin gel.

In tab. 1 shows the time of gelation of a urea resin, curable oxalic acid with and without the addition of sodium oxalate, and the quality of the gel. Each sample of curable carbamide resin is injected with 5 g of finely ground CaCO powder with a total

with a surface of 5000 cm, the saquelm artificially creates conditions simulating the contact of the gel-forming solution with CaCO in the pores of the concrete over a considerable area. For comparison, the formulation is prepared without the addition of sodium oxalate with CaClO.

In tab. 2 shows the results of tests for uniaxial compression of specimens of cylindrical shape E 40 mm and mm of fixed lime aggregate and for breaking samples of eights from

concrete, glued carbamide resin. Three formulations with sodium oxalate with a gelation time of 16.33 and 79 minutes are used as the fixing solution. For comparison, the same formulations are taken, but without sodium oxalate.

From the test results, it follows that the addition of sodium oxalate gives oxalic acid a high buffering rate, as a result of which the gel time of the urea resin increases upon curing, while the gel strength does not decrease; Calcium carbonates do not affect the curing time of the resin with oxalic acid supplemented with sodium oxalate; the strength of the crumbs of limestone, fixed with urea resin with the addition of sodium oxalate, BtJBue, than fixed without sodium oxalate. The same is observed when tensile samples glued with carbamide resin are tested.

Table 1

Proposed

30 0.25

15

0.15

5 0.05

30 15 0.25 0.15

5 in, 05

Known 30

15

five

thirty

15

five

Strong gas release not observed

Same same

12 Porous Intensive gapping

well

38 Slaba

Claims (2)

It does not form an injectable solution for compaction of concrete, comprising an aqueous solution of a carbamide resin with a density of 1,151,77 g / cm and oxalic acid, characterized in that, in order to prevent gaseous gases in the pores of the concrete , increasing the compressive strength of concrete, adhesion of the solution to the concrete surface and simplifying the technology, it additionally contains sodium oxalate in the following ratio of components, weight. h: Table of pr Cce HV Aqueous solution of a carbamide resin with a density of 1.15-1.07 g / cm100 Oxalic acid5-30 Sodium oxalate 0.05-0.25 Sources of information taken into account during the examination 1.Adamovich A.N. Koltunov D. Into the establishment of bases of hydraulic structures. Energo, 1953, p.203. 2. Authors certificate of the USSR 79404, cl. From 04/31/30, 1968.