SU591547A1 - Method of consolidating ground - Google Patents

Description

I

The invention relates to the construction and building materials, mainly to the strengthening of soils for the construction of foundations and coatings in road and airfield construction.

There is a known method of reinforcing the soil, which consists in moving the soil with various ground materials 1.

The disadvantages of this method include such low physical and mechanical indicators of the fortified soil, as strength, frost resistance.

The most blunt to the described method according to the technical essence and achievable effect is a method of strengthening the soil, which includes moving the soil with ash, followed by moistening and compaction of the soil mineral mixture 2.

The disadvantage of this method is low durability and frost resistance of earths. This is due to the fact that the soil-borne mixture, compacted no later than 0.2 days after the start of soil movement with ash, increases in volume due to the slow process of hydration of free lime n anhydrite contained in the ash. At IT, there is a significant decompression of hardening material with the formation in it

cracks that violate the monolithic nature of the earth layer worsen the conditions for the formation of new structural bonds.

The goal of the bobregenn is to increase the strength and frost resistance - achieved by the method of strengthening the soil, including the mixing of the soil with ash, followed by wetting, sealing and compaction of the soil mixture, before the compaction is kept in a wet state for 4-8 days .

After mixing the soil with the ashes and wetting the mixture, the free lime and anhydrite contained in the ashes are hydrated. In the first days, the hydration causes a significant volumetric expansion of the soil-ground mixture, then the intensity of the hydration process decreases sharply. Keeping the wet soil mixture before compaction for. 4-8 makes it possible to eliminate in the subsequent decomposition of the hardening material and ensure its increased strength and frost resistance.

Example. The fine sand was strengthened with the Lancev fly ash of the Baltic SDPP. Indicators of physico-chemical properties of applied hall-ablation are given in Table. .

The dosage of ash is based on the weight of the soil to be strengthened. At the same time, the ashes are first mixed with the ground; after the mixture, the mixture is moistened to the water-based optimum for compaction. The mixture is kept in a wet state for various periods of time - from 0.2 to 8 days and standard cylinders are made from it, the samples are stored under air conditions for 90 days and then tested.

The results are shown in Table. 2

The test results show a significant increase in the strength and frost resistance of the soil, fortified by the proposed method. The positive effect from the application of the method is obtained when using cyclone zoo-iyos as a cement-bearing material with a specific surface of less than 3000 g and a free lime content of more than 10 yo / d.

35OO

Eectrofeam

2630 Zwjlonna

8.2i

6.27

17.48

13.42

3.38

4.83 Fvggko-mvhanvcheskvv properties Gphodopzhv P 1dela strength 1fn telviv VYOZHYA-tvsh water-dwelling about ash | kgf / cm of wahai of moisture of aologous corrosive eletro l mixed before 1 rotary compaction, day

38.6

0.2

(control)

64, O 72.3 69, O

Claims (2)

Invention Formula A method of strengthening the soil, which includes mixing the soil with ashes with subsequent moistening and compacted zologruite mixture, characterized in that, in order to increase strength and frost resistance, the eologruite mixture is kept wet for 4-8 days before compaction. Table2 3.2 0.65 0.75 0.66 0.89 0.74 0.75 0.80 Sources of information taken into account in the examination: I. Instructions on the use of soils reinforced with stinging materials for the construction of bases and surfaces of highways and airfields (CH 25-74), M., Stroyizdate, 1975. 2. USSR author's certificate number 384974, cl. E 02 D 3/12, 07.27.71. soil, uhreplevo oo on avvstnomu proposed method. Kaeffvoy pg moroo with "stand eos of ash of raelectrofil inclined gov rok