SU1013281A1 - Method of moulding articles from cement-soil mixes - Google Patents

Abstract

METHOD OF FORMING PRODUCTS FROM CEMENTOGROUNT MIXTURES; incl. your styling mix & fork in one hundredth century ouppotevne under 1 starter; with the load, because, with the aim of increasing strength, frost resistance in water absorption,; Browpption is carried out according to the following special regime: in the flow of O, 5-1 mVv without load, with the frequency Gp in eomatt1AUD 1.0-4, О mm, and then in the flow of 12 mvv with load, pressure 0, 0.05 g 0, O075 MPa5 with frequencies L 25-42 Ha .. and the first one O, 5-O, 8 mm

Description

The invention relates to the construction industry, in particular to the manufacture of products from an artificial building material - cement. There is a known method of manufacturing products with compaction of amentoment {oh mixture in forms by surface tamping with electric rammers and demolition jacks Cl. However, the method is time consuming and gives insufficient and uneven consumption of the mixture, which reduces the supply of products. The closest to the invention is a method for forming cement from soil-cement mixtures, including putting the mixture into a mold and bilateral vibroplating under a vibration load with an oscillation amplitude of 1.0 mm 2}. The disadvantages of this method are the low degree of compaction of the mixture and the reduced strength of the products. The aim of the invention is to increase the strength of the products, frost resistance and reduce water absorption. This goal is achieved by the fact that according to the method of forming products from cement-ground mixtures, including laying the mixture in the formula and bilateral vibration compaction under the vibration load, the vibration compaction is carried out in a slurry mode: for 0.5-1 min, without weighting, with a frequency of 17- 32 Hz and amplitude 1.0-4, О mm, and aatGM for 12 min, with weights, pressure 0, Оb250, О075 MPa, with a frequency of 25-42 Hz and amplitude 0.5-0.8 mm. The method is carried out as follows. A cement-ground mix is placed in the metal vibroboc mounted on the table, and for 0.5-1.0 min they include a vibroblock with an amni1I wobble of 1.0-4.0 mm and a frequency of 17-32 Hz. Then, the vibrating load with pressure 0.0025-О, ОО75 MPa is lowered into the mold on the mixture from above, and the vibroblock (with or without stop) is switched to the amplitude O, 35-0.5 mm and the frequency 2542 Hz per 1, O- 2.0 min Example. The metal form of trapezoidal section with dimensions of 118 X 100 X 30 cm is placed on the vibroblock table with the frequency and amplitude of oscillations that are adjustable during operation, the reinforcement and ground-cement mixture are compacted into the form; composition (per 1 m of products): 1.2 m of soil (sandy) 287 kg of cement brand ZOO. The vibro-consolidation of the cement-ground mixture is carried out in two stages. First: for O, 7 minutes, without vibration, with an amplitude of 1.2 mm and a frequency of 20 O col / min; second: for 1.3 minutes. with a vibration pressure of 25 gf / cm, an amplitude of 0.35 mm, and a frequency of 950-20000 count / min. The loading plate is lowered and the density of the mixture is measured. Bulk density is 2.2-2.28 tf / m. After steaming under normal heat and humidity conditions, a cement-cement product with a material grade of 150 (compression strength) is obtained. The results of the tests with different parameters of vibration compaction are given in Table. one. . From tab. 1 it follows that the most rational compaction of cement-based: the mixture is a seal on the vibrating plates with certain combinations of vibration modes in two stages. In tab. 2 shows the dependence of the bulk mass jp. compacted cement-soil mixture and duration Xj of compaction from the frequency of copebay f at the first stage of the optimal amplitudes A 1.0–1.6 mm elliptical or, О-4, О mm of vertical oscillations. Unsatisfactory values of 15 Hz are explained by the lack of adequate precision of vibration, and at 1G / 4O Hz - by decompression of the mixture. Thus, at the first stage of vibro-compaction, at the optimal frequency we oscillate f 17–32 Hz (1OOO2OOO number / min) .. In the table. 3 shows the dependence of o- and T on the amplitude A of elliptical oscillations of the first stage at the optimum frequency of 17-32 Hz (1OOO 2000 kop / min). Unsatisfactory values of tr and T- at 7 mm of elliptical oscillations are due to the fact that cement-ground mixtures pushes the rotational movement in the direction opposite to the rotation of the shaft of the unbalance. In tab. 4 shows the dependence of T. and T on the amplitude A of vertical, oscillations of the first stage at optimal values of f,. . The removal of v at, O mm is explained by increased air intake in the cement / ground mixture. In tab. Figure 5 shows the dependence of the bulk mass on the compacted mixture and the duration of compaction T-, at the second .101 rum stage or the frequency cc fucking fj at optimal amplitudes, 35 - -. O, 5 mm elliptical or, 5, 8 mm vertical oscillations and pressure of the weights, ОО25-0.0075 MPa (25 75. G / cm). According to the table. 5, in the second compaction stage, the frequency values of 25-42 Hz (150 ~ 250 O col / min) will be optimal. In tab. -6 shows the dependence of y and T „and the compressive strength of 1. Of the Tashuchuda hell of elliptical vibrations, with a small consumption of cement, optimal A, |, At, 2 mm, the intensity of the contraction is insufficient for a flatness, and at A 0,8 mm separation occurs; mixtures ... l4 In table. Figure 7 shows the dependence of jf2 Tl yJ on the amniudy Ad vertical jj j oscillations at the second stage with optimal 2l PJJ, Hj, А-I and T. Table. 7 follows, that for vertical oscillations A2jj, jj, 5rO, i3 mm, In tab. Figure 8 shows the dependence of, y, T2 n, d on the value of the primer P © for the naive A, f, Tjj 2 Izteb. 8 it follows that the lvl “1 and 1 to 0.01 MPa does not have an effect, but, nevertheless, it is not viable In tvba. This data is compared to a hariikteris by production of cement-and-natural mixtures made of limestone and permeable by methods. As can be seen from the table. 9, the proposed method will allow to increase the strength of the toblock soil by 25%, reduce water absorption and frost resistance .: Table a 1

On V1 vibroplatform, amplitude, 4 oscillation frequency f 48 Hz

{288 O / min)

. ,

Only by a loading plate, 4 mm, 48 Hz (2880 count / min)

On the vibrating blade,, 5 mm, 48 (2880 count / min), prigrua pressure MPa. (5O g / cm)

On vibroplane,, About mm, 32 (2OOO number / min),, O05 MPa On the external loop with elliptical: fluctuations in two.: Stages:

, O.-1.6 mm, 17-32 Hz (1OOO-2X) GS ko / min)

Aa, 0.35-0.5 mm, 25-42 Hz

(1500-2 50O count / min)

, ОО25-0.0075 MPa

(25-75 g / cm2)

On a vibrating plate with vertically directed oscillations in two

, O-4.0 mm, 17-32 Hz (1OOO-20OO kots / min) ,, 8 mm .2 25-42 Hz (150О-25ОО number / min) Р Ю; О025), ОО75 MPa. (25-75 g / cm-)

No change

1.78-1.82

2, O

2,01,92-1,95

1.98-2.05

2.0

1.0

2.16-2.26

2.0

1.0

2D8t2,28

-2i2. Bulk mass, g / cm3 1.8; 2.032.05 Prodosti seals, O0.5-0.8 nor TL, min5.0

Bulk mass ir

1,682.01

Duration

seals T, yin (3,00,8-1,0 y, g / cm 1,622, ОО2,02 Т, MIN 12,0 1,00,5-0,8

, g / cm 2,012,20, 2,222,222,14

Tj, min 6,01,6-2,0 1,0-1,52,03,0

, T a b l and c a 6

2, About

2.18

7.0

1.0-2.0

14-15

5-8

Table 21

Table 3

2,031,82

0,5-O, 8

Table 4

Tablia 5

2.10

3.0

9-11 0.5-0.8 2.032, O2 1.991.88 0.5-0.8 "0.81.01.5

2.07

2,192,222,1O

1.0-2.01.0-2.02.0. 6, O

13-1514-1610-12 8-9 2.072.2O2.23 9-1013-15 R, MPa c "4.02.5 1.0-2.0 T, min

2

Strength, kg / cm

Density, t / m Water content,% Frost resistance, cycle

Table 8

Table 9

 150, .2.20-2.28

8.2-9, E 95-i05 2,222.22 15 1615-16 1.0-2.0, 2.0

Claims (1)

METHOD FOR FORMING PRODUCTS FROM CEMENT-GROUND MIXTURES / including laying the mixture in * form and two-sided vibration compaction under vibropri: with a load, characterized in that, in order to increase strength / frost resistance and reduce water absorption, the compaction is carried out according to the following mode: within 0.5-1 min, without a load, with a frequency of 17–32 H and an amplitude of 1.0–4.0 mm, and then For 12 min with a load, a pressure of 0.0025–0.0075 MPv | with a frequency of 25-42 GN. and with an amplitude of 0.5-0.8 mm *. X