AT411361B - Monitoring setting of road-surfacing concrete, determines compressive strength of test cubes to establish when use by traffic may be permitted - Google Patents

Abstract

The concrete is mixed in-situ, including flow promotion agent and optional retardant or accelerator. Setting is monitored using test cubes, keeping them thermally-insulated. Their compressive strength is determined. Weighted setting is plotted as a graph against cube compressive strength. The degree to which hardening of the road concrete has advanced, is determined. It is ensured that traffic strength is reached. This is achieved on e.g. reaching 50% of the ultimate strength at 28 days, at a compressive strength of 20 N/mm squared.

Description

AT 411 361 B

The invention relates to a method for producing roadway concrete from traffic areas, in particular in the course of repairing existing traffic areas. Such a method is used to monitor (check) the hardening process of concrete, this method being intended in particular to determine when traffic areas, the roadway concrete of which has been produced or renewed (repair), can be opened to traffic. In this context, it is desirable to be able to open the traffic area to traffic as early as possible without damaging the freshly produced roadway concrete.

The invention further relates to a method for producing roadway concrete from traffic areas, wherein the repair of existing traffic areas, ie the renewal of parts of the roadway concrete, is also considered.

The invention is based on the fact that traffic areas can only be opened to traffic after the roadway concrete has been produced when the roadway concrete has reached a compressive strength of at least 50% of the final strength after 28 days. For reasons of safety, there is currently a wait of about one to three days before the traffic area can be cleared, since it is only then 15 that it is certain that the concrete strength mentioned has been reached.

It should be noted that determining the strength of concrete using so-called test cubes with an edge length of 15 x 15 x 15 cm or 20 x 20 x 20 cm for determining the maturity of the concrete (determining the course of the strength development of the concrete) with the actual maturity development, for example in a traffic area, is not reproducible. 20 To determine the ripeness of concrete, it is also known to determine the weighted ripeness of the concrete with the aid of appropriate measuring devices (manufacturer VERBOOM BETONTECHNIK). On the article " Weighted maturity of the concrete " in: BETON 48/1988, volume 11, pages 674-678. In particular, the determination of the so-called C value is considered within the scope of the present invention. The determination of the C-value is based on the measurement 25 of the strength development of a concrete. Part of the test specimens are stored in a water bath at 20 ° C and part of the test specimens at 65 ° C. The compressive strength is determined at different times, as described in the mentioned article "Weighted maturity of the concrete". et al is described.

The invention is based on the object of making available a method for determining the strength development (maturity) of concrete, in that the strength development determined on the basis of test specimens is based on that of concrete bodies, e.g. Roadway concrete from traffic areas, can be transferred conclusively.

Furthermore, the invention is based on the object of providing a method for producing concrete bodies, in particular roadway concrete from traffic areas, 35 in which traffic release is possible as early as possible.

This object is achieved according to the invention with the features mentioned in the independent method claims.

In the method for determining the strength development of concrete, the procedure is essentially such that the strength development is first determined by determining the C values using cubes which are thermally insulated on all surfaces, for example by a Styrofoam coating, and that A calibration curve is created from the C values determined in this way, corresponding to the development of the maturity of the concrete (strength of the concrete). The measure, the C values based on the test specimens (cubes with an edge length of 15/15/15 cm or cubes with an edge length of 20/20/20 cm) in isolated forms gives relationships between time and directly transferable to the strength of concrete in 45 large fields Strength of the concrete. Strength here means primarily the compressive strength of the concrete, which can be used as an indicator of the bending tensile strength of the concrete.

Because the so-called C-value of the concrete is determined in the method according to the invention - the C-value indicates the maturity of the concrete - it is possible to determine the 50 C-value on the manufactured concrete body, e.g. the roadway concrete of a traffic area, to determine when the strength of the concrete required for striking the concrete body or the release of a roadway concrete of a traffic area is reached. The advantage here is that in one embodiment the method according to the invention determines the strength development by determining the C value, irrespective of the temperature sensitivity of the cement used in the concrete, reproducible values for the strength of the 2

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Concrete results.

In the method according to the invention for the production of concrete bodies, in particular the road concrete of traffic areas, a factory-mixed or on-site mixed road concrete with or without retarder and addition of flow agent with or without the addition of accelerator 5 is used on the construction site and by using the method according to the invention for determining strength (maturity) determined when the strength required for traffic approval of 50% of the final strength is reached after 28 days. This ensures that the traffic area can be cleared even less than 6, after 6, after 8, after 10 or after 12 hours. This is considerably shorter than the usual release of traffic space after one to three days. »*

When manufacturing roadway concrete for traffic areas, the following can be carried out within the scope of the invention.

Step 1:

Deliver the concrete mix mixed with the mixing water required to achieve the desired water / cement value and the required amount of retarder to the construction site.

Step 2:

On the construction site: moving the delivered concrete mix with a plasticizer and an accelerator. 20 Step 3:

Mix the concrete mix thus obtained on the construction site.

Step 4:

Application of the road concrete thus obtained, for example for repairing road surfaces (road concrete). 25 The development of strength, i.e. the maturity of concrete, can also be checked using the

Determination of the heat of hydration take place.

Further details, features and advantages of the invention result from the following description of determinations of the course of maturity development and on the basis of the exemplary embodiments. 30 preliminary tests

Cement tests with retarder and accelerator combinations were carried out beforehand.

The evaluation of the heat of hydration curves are shown in FIG. 1 in the form of a curve. The diagram of FIG. 1 shows the course of the temperature given by the heat of hydration. This is explained as follows. 35 1 temperature maximum

The level of the maximum temperature is a measure of reactivity (fineness of the cement). The time of the maximum temperature is also decisive, a higher ground cement (CEM II / AS 42.5 R WT 42 (PZ 375), CEM I 52.5 R (PZ 475) has the maximum temperature earlier than a little bit ground (CEM II / AS 42.5 N (DZ) (PZ 275 HDZ) 40 2 area under the curve

The area under the curve is a measure of the reactivity of the cement. The strength of the cement (concrete) can be estimated from this area if the properties of the cement are known. The strength development can also be estimated from the area and the geometry of the curve. The more pointed the curve, the faster the strength development. 3 Time of temperature rise

The point in time of the temperature rise is essential for our investigations, since this shows the end of the processability. 4 Initial temperature see above The initial temperature shows the reaction of the cement and the admixture mixture directly after adding water. Accelerator / decelerator combinations show a very high initial temperature (violent reaction in the cement paste), which, however, "falls asleep" after a few minutes. After this phase the accelerator begins to work (point 3) has been reached - > rapid increase in temperature (effect of the accelerator starts fully). 55 5 Strength development 3

AT 411 361 B

In parallel to the thermal curve, the strength development must also be determined. The thermal cubes would be best suited for this. The thermal curve can then be calibrated from this data and the strength can be estimated from the temperature profile.

2 shows the course of the temperature due to the heat of hydration for different concrete admixture combinations,

3 shows the heat of hydration during an accelerator test with different types of cement,

4 shows the course of hydration heat in a retarder test with WZ 375 (manufacturer Ladce) and accelerator,

5 shows the heat of hydration with different retarders and accelerators,

6 shows the heat of hydration of a zemerite mixture with a flow agent (Ma-pefluid X414),

7 shows the course of hydration heat of a concrete mixed with a polycarboxylate as flow agent and a long-term retarder, and FIGS. 8 to 22 the course of the development of the strength of the concretes mentioned in the examples.

From the test results obtained in diagram form in FIGS. 3 to 7, it was found that an accelerator cancels the action of the retarder. This makes it possible to drive the concrete to construction sites further away (see Fig. 5).

Laboratory and construction site trials

After these preliminary tests, concrete tests were carried out in the laboratory and on the construction site.

First of all, the so-called C-value of the Zemepts was determined. This value ensures that the device used to determine the C value (Verboom concrete ripening computer) works independently of the temperature sensitivity of the cement used in the concrete.

The tests or examples 1 to 13 relate to the following: 1. The strengths with the ripening values were entered in a " calibration curve. 2. The strengths were entered depending on the cube shapes. It can be seen that the individual forms play a major role in early-strength concrete. The two concrete cubes hardened in the thermoforming approximately correspond to the ceiling strength. 3 .. 4..6. Different variants of a 12 hour concrete with and without retarder in connection with accelerator. 5 .. 7-10. Different variants of a 6 hour concrete with and without a retarder in connection with

Accelerator. 11. Dry mix in the factory of a 6 hour concrete, the additives and the water were added on site, this saves the delay. 12 .. 13. 6 hours of concrete with additives with and without artificial air pores.

The following was carried out in detail in the experiments or examples. 1. 17.04 Determination of the calibration curve using the strength curve and maturity method. 2. 27.04 OB 12 hours. Comparison of the individual cube shapes compared to the maturity in the

Concrete ceiling. 3. 14.05 OB 12 hours. With retarder 0.5 M% based on cement weight and plasticizer +

Accelerator on site. 4. 14.05 OB 12 hours with retarder 0.5 M% based on cement weight + fibers and superplasticizer + accelerator on site. 5. 06.06 OB 6 hours without retarder 6. 06.06 OB 12 hours without retarder Flux + accelerator on site. 07/07/06 OB 6 hours with retarder eluent + accelerator on site. 8. 07.06 OB 6 hours without retarder eluent + accelerator on site. 9 20.06 OB 6 hours with cement mixture with retardant superplasticizer + accelerator on the

Construction site. 10. 20.06 OB 6 hours with cement mixture with retarder with fibers plasticizer + accelerator at the construction site. 11. 04.07 OB 6 hours with PZ 475 dry mix 4 5

AT 411 361 B

Water, air entraining agents, superplasticizers and accelerators on the construction site. 12. 18.07 OB 6 hours with cement mixture with an additive (e.g. silica fume), air, retarder, superplasticizer and accelerator on site. 13. 18.07 OB 6 hours with cement mixture with an additive (e.g. silica fume), without air,

Retarders, flow agents and accelerators on the construction site.

The following abbreviations are used in the examples below: OB = top concrete M% = mass percentage BST = construction site 10 B400 = the desired strength of the concrete FTB = resistance to frost and de-icing salt HS = hard chippings PZ 375 Ladce = Portland cement 375 from the manufacturer Ladce RKI 0/8 = Round grain with a grain size of 0 to 8 mm 15 EBK 11/22 = fine crushed grain with a grain size of 11 to 22 mm

Air pores = air entraining agent FM = flow agent FB = fresh concrete 20 LP-pot = test device for determining the artificially introduced air on fresh concrete, according to the norm w / z value = water-cement value 20 he S = steel mold for a test cube with 20 crh edge length 15 er K = plastic mold for a cube with an edge length of 15 cm W + B = test specimen cube / bar 25 30 35 40 45 50 5 55

AT 411 361 B

Example 1 (Figs. 8, 9 and 10) 10 15 20

Variety:

Date: 0.0 0.0 6.0

Solidity curve + calibration curve determination 450 738 978 165.0 1.5 OB B400 FTB 12 hours HS PZ 375 Ladce Lab.Nr .: F0417-1 / 01 04/17/01 mixing time 1.00 p.m. kg PZ 375 Ladce construction site 2.15 p.m. mixed in 2.30 p.m. kg RK I 0/8 W + B 2.45 p.m. kg SFBC 11/22 kg water 0.0 kg It air pores 0.0 kg It retarder 0.0 kg kg accelerator 0.0 kg fibers It plasticizer 0.0 kg 2.339 kg FB weight Temperature 9.5 ° degrees air 26 16 “degrees concrete temperature spreading width fresh concrete weight without FM with FM cubes FB weight 2348 30 cm 31 47 LP pot FB weight 2313 w / z value actual PC 445 kg actual water. 172 kg / m3 kg / m3 It% 0.39 5.8 w / z Value strength:

Air pores S = steel, K = plastic, T = Thermo 40 45

Std Strength N / mm2 Std Strength N / mmz Std Strength N / mm2 Free Outdoor Thermo 50 Cubes Cubes Cubes Cubes Maturity No .: 1 4 2 3 like 15s 15s 20s 20s

10 shows the strength curve for a concrete with the composition It. Example 1, but not 20.0 kg of accelerator. 6 55 10 15 20

Example 2 (Fig. 11) rte: um: 1.0 0.0

AT 41 1 361 B

Strength curve OB B400 FTB 12 hours HS PZ 375 Ladce

Lab.Nr .: F0427-1 / 01 450 728 950 170.0 1.5 5.0 27.04.01 mixing time 11.45 a.m. kg PZ 375 Ladce construction site 11.45 a.m. kg mixed in 12.00 p.m. kg RKI 0/8 W + B 12.00 p.m. kg EBK 11/22 kg water 0.0 kg It air pores 0.0 kg It retarder 0.0 kg kg accelerator 0.0 kg Fas < It plasticizer 0.0 kg FB-weight 2.306 kg 25 emDeratur 22 “degrees air 28“ degrees concrete temperature wide width fresh concrete weight 30 without FM with FM cubes FB-weight 2312 cm 48 LP-pot FB-weight 2298 35 z-value according to PC 449 kg actual water content 175 kg / m kg / m3 It% z value 0.39 5.0 40

Air pores S = steel, K = plastic, T = thermo

Activity: 45 50 hours strength N / mm2 hours strength N / mm2 hours strength N / mm2 free box Thermo 20 erS 15 er K

Air blanket cube cube maturity no .: 1 2 like 7 55

AT 411 361 B

Example 3 (Fig. 12)

Strength curve: OB B400 FTB 12 hours HS PZ 375 Ladce retarder and accelerator_

Lab. No .: F0514-1 / 01 at: 05/14/01 mixing time 8:00 a.m. 450 kg PZ 375 Ladce construction site 8:30 a.m. kg mixed 8:45 a.m. 702 kg RK1 0/8 W + B 9:00 a.m. 935 kg EBK 11/22 170.0 kg water 0.0 kg 1.5 It air pores 0.0 kg 2.0 It retarder 0.0 kg 25.0 kg accelerator 0.0 kg Fas < 9.0 It superplasticizer 0.0 kg__ FB weighing temperature width cm z-value according to PC z value: 2,295 kg 22 “degree air 22“ degree concrete temperature fresh concrete weight without FM with FM cubes FB weight 2322 49 LP-pot FB -Weight 2301 451 0.40 kg actual water content Air pores S = steel, K = plastic, T = Thermo 182 5.0 kg / m kg / m3 It%

Std Strength N / mm2 Std Strength N / mm2 Std Strength N / mm2 Free Outdoor Thermo Cube Blanket Cube Cube Maturity No .: same as 8 »

Example 4 (Fig. 13)

AT 411 361 B

Strength course 5 rte: OB B400 FTB 12 hours HS PZ 375 Ladce Lab. No .: F0514-2 / 01 with fiber, retarder and accelerator 10 15 20 at: 14.05.01 mixing time 09.15 a.m. 450 kg PZ 375 Ladce construction site 9.45 a.m. mixed in 10.00 a.m. 703 kg RKI 0/8 W + B 10.15 a.m. 936 kg EBK 11/22 170.0 kg water 0.0 kg 1.5 It air pores 0.0 kg 2.0 It retarder 0.0 kg 25.0 kg accelerator 1.0 kg fibers 8.0 It plasticizer 0.0 kg_ FB weight kg 25 30 35 40 temperature width cm z-value as appropriate PC z value: 2.297 22 “degree air 22“ degree concrete temperature fresh concrete weight without FM with FM cubes FB-weight 2312 50 LP-pot FB-weight 2298 450 0 , 41 kg of actual water Air pores S = steel, K = plastic, T = thermo 185 5.1 kg / m3 kg / m3 It% 45 50 hours strength N / mm2 hours strength N / mm2 hours strength N / mm2 cubes ceiling cubes cubes maturity no. : like 9 55

AT 411 361 B

Example 5 (Fig. 14)

Strength course OB B400 FTB 6 hours HS PZ 375 Ladce

Lab. No .: F0606-1 / 01 at: 06.06.01 mixing time 1.00 p.m. 500 kg PZ 375 Ladce construction site 2.15 p.m. mixed in 2.30 p.m. 699 kg RKI 0/8 W + B 2.45 p.m. 915 kg EBK 11/22 175.0 kg water 0.0 kg 1.9 It air pores 0.0 kg 0.0 It retarder 0.0 kg 0.0 kg accelerator 0.0 kg fibers 9.0 It plasticizer 0.0 kg FB weight 2,300 kg emoerature width cm 27 "Degree air 26" degree concrete temperature fresh concrete weight without FM with FM cubes FB weight 2322 49 LP pot FB weight 2301 z value tsächl.PZ z value 500 kg 0.39 actual water. Air pores 197 4.9 kg / m3 kg / m3 It% iqkeit: S = steel, K = plastic, T = thermo hours strength N / mm2 hours strength N / mm2 hours strength N / mm2 outdoors free thermo cubes ceiling cubes cubes maturity No .: like 10

AT 41 1 361 B

Example 6 (Fig. 15)

Strength course 5 rte: OB B400 FTB 12 hours HS PZ 375 Ladce Lab. No .: F0606-2 / 01 with accelerator, without decelerator at: 10 15 20 0.0 450 703 936 170.0 1.5 25.0 7.0 06.06.01 mixing time 8:30 a.m. kg PZ 375 Ladce construction site 9:00 a.m. kg mixed in 9:15 a.m. kg RKI 0/8 W + B 9:30 a.m. kg EBK 11/22 kg water 0.0 kg It air pores 0.0 kg It retarder 0.0 kg kg accelerator 0.0 kg Fas It plasticizer 0.0 isa__ FB -Weighing 2.293 kg 25 emoerature 24 “degrees air 23“ degrees concrete temperature width fresh concrete weight 30 without FM with FM cubes FB weight 2318 cm 51 LP-pot FB weight 2290 35 40 z-value tZächl.PZ z iakeit: 450 0 , 40 kg actual water Air pores S = steel, K = plastic, T = thermo 181 5.1 kg / nr kg / m3 It% 45 50 hours strength N / mm2 hours strength N / mm2 hours strength N / mm2 cubes ceiling cubes cubes maturity no. : like 11 55

AT 411 361 B

Example 7 (Fig. 16)

Strength course: um: OB B400 FTB 6 hours HS PZ 375 Ladce with accelerator and retarder

Lab.Nr .: F0607-1 / 01 10 15 20 2.0 10.0 500 685 903 185.0 1.9 25.0 07.06.01 mixing time 07.00 a.m. kg PZ 375 Ladce construction site 08.00 a.m. kg mixed 8.30 a.m. kg RKI 0/8 W + B 08.45 a.m. kg EBK 11/22 kg water 0.0 kg It air pores 0.0 kg It retarder 0.0 kg kg accelerator 0.0 kg Fas It superplasticizer 0.0 kg_ FB weight 2.312 kg 25 emoeratur 23 ° degrees air 22 ° degrees concrete temperature width fresh concrete weight 30 without FM with FM cubes FB weight 2329 cm 51 LP pot FB weight 2307 35 40 z-value tsächl.PZ z iakeit: 499 0.40 kg actual. Wassergeh. Air pores S = steel, K = plastic, T = Thermo 200 4.8 kg / m kg / m3 It% 45 50 hrs strength N / mm2 hrs strength N / mm2 hrs strength N / mm2 free outdoor thermo cubes ceiling cubes cubes maturity No .: like 12 55

AT 41 1 361 B

Example 8 (Fig. 17)

Strength course 5 rte: OB B400 FTB 6 hours HS PZ 375 Ladce Lab. No .: F0607-2 / 01 without retarder, with accelerator 10 15 20 at: 07.06.01 mixing time 10.00 a.m. 500 kg PZ 375 Ladce construction site 10.30 a.m. mixed in 10.45 a.m. 685 kg RKI 0/8 W + B 11.00 a.m. 905 kg EBK 11/22 183.0 kg water 0.0 kg 1.9 It air pores 0.0 kg 0.0 It retarder 0.0 kg 25.0 kg accelerator 0.0 kg fibers 10.0 It superplasticizer 0.0 kg FB -A balance 2,310 kg 25 emoeratur 26 "degrees air 25" degrees concrete temperature width fresh concrete weight 30 without FM with FM cubes FB weight 2325 cm 52 LP pot FB weight 2305 kg / m3 kg / m3 35 40 z-value tsächl.PZ z Value: 499 0.40 kg actual water content Air pores S = steel, K = plastic, T = Thermo 199 5.2

It% 45 50 hrs strength N / mm2 hrs strength N / mm2 hrs strength N / mm2 free outdoor thermo cubes ceiling cubes cubes maturity no .: as 13 55

AT 411 361 B

Example 9 (Fig. 18)

Strength course 5 rte: OB B400 FTB 6 hours HS PZ 375/475 Lab. No .: F0620-1 / 01 with retarder, with accelerator at: 06/20/01 mixing time 8:00 a.m. 300 kg PZ375 construction site 8:30 a.m. 200 kg PZ475 mixed in 8:30 a.m. 685 kg RKI 0/8 W + B 8:45 a.m. 905 kg EBK 11/22 190.0 kg water 0.0 kg 2.0 It air pores 0.0 kg 2.0 It retarder 0.0 kg 20.0 kg accelerator 0.0 kg fibers 10.0 It superplasticizer 0.0 kg FB weight 2.314 kg 25 emDerature 23 “degrees air 24 ° degrees concrete temperature width fresh concrete weight 30 without FM with FM cubes FB weight 2330 cm 51 LP pot FB weight 2312 kg / m3 kg / m3 35 40 z-value tsächl.PZ z iakeit : 500 0.40 kg actual water content Air pores S = steel, K = plastic, T = Thermo 202 5.0

It% 45 50 hrs strength N / mm2 hrs strength N / mm2 hrs strength N / mm2 free outdoor thermo cube ceiling cube cube maturity no .: same as 14 55

AT 41 1 361 B

Example 10 (Fig. 19)

Festivity course 5 rte: OB B400 FTB 12 hours HS PZ 375 Ladce Lab.Nr .: F0606-2 / 01 with accelerator, without delay at: 06.06.01 mixing time 8.30 a.m. 450 kg PZ 375 Ladce construction site 09.00 a.m. kg mixed in 09.15 a.m. 703 kg RKI 0/8 W + B 9.30 a.m. 936 kg EBK 11/22 170.0 kg water 0.0 kg 1.5 It air pores 0.0 kg 0.0 It retarder 0.0 kg 25.0 kg accelerator 0.0 kg fibers 7.0 It plasticizer 0.0 kg FB weight 2.293 kg 25 emDerature 24 “degrees air 23“ degrees concrete temperature wide width fresh concrete weight 30 without FM with FM cubes FB weight 2318 cm 51 LP pot FB weight 2290 35 40 z -Value tsächl.PZ z value iqkeit: 450 0.40 kg actual water. Air pores S = steel, K = plastic, T = thermo 181 5.1 kg / m3 kg / m3 It% 45 50 hours strength N / mm2 hours strength N / mm2 hours strength N / mm2 cubes ceiling cubes cubes maturity no .: like 55

AT 411 361 B

Example 11 (Fig. 20)

Festivity course:

Lab. No .: F0704-1 / 01 at: 10 15 20 0.0 20.0 8.0 OB B400 FTB 6 hours HS PZ 475 dry water, eluent and accelerator on ex. 500 685 905 195.0 2.4 04.07.01 mixing time 8.00 a.m. kg PZ 375 construction site 9.00 a.m. kg PZ475 mixed in 9.30 a.m. kg RKI 0/8 W + B 09.45 a.m. kg SFBC 11/22 kg water 0.0 kg It air pores 0 .0 kg It retarder 0.0 kg kg accelerator 0.0 kg Fas It plasticizer 0.0 kg_ FB weight 2.315 kg 25 emDeratur 24 ° degrees air 21 ° degrees concrete temperature width fresh concrete weight 30 without FM with FM cubes FB weight 2322 cm 48 LP pot FB weight 2312 35 40 z-value tsächl.PZ z value iqkeit: 499 kg actual water. 200 0.40 air pores 4.9 S = steel, K = plastic, T = thermo kg / m kg / m3 It% 45 50 hrs strength N / mm2 hrs strength N / mm2 hrs strength N / mm2 free outdoor thermo cubes ceiling cubes Cube maturity no .: like 16 55

AT 411 361 B

Example 12 (Fig. 21) Strength curve: OB B400 FTB 6 hours HS PZ 375/475 with silica, air, retarder and accelerator Lab.Nr .: F0718-1 / 01 at: 07/18/01 08:30 250 250 678 897 175, 0 2.0 2.0 25.0 9.0 kg kg kg kg kg it It kg it PZ 375 Ladce PZ475 RKI 0/8 EBK11 / 22 water air pores retarder accelerator solvent

Mixing time construction site mixed in W + B 09.30 09.45 10.00

O'clock o'clock o'clock 0.0 0.0 25.0 0.0 0.0 kg kg kg kg kg_

Microsilica fibers FB-Weighing temperature 25 25 ° degrees " degrees 2.3131 kg air concrete temperature fresh concrete weight width cm z-value tsächl.PZ z value without FM with FM cube FB-weight 2325 51 LP-pot FB-weight 2315 500 kg actual water , 202 kg / m kg / m3 It% 0.40 5.2

Air pores S = steel, K = plastic, T = Thermo iqkeit: Std Strength N / mm2 Std Strength N / mm2 Std Strength N / mm2 Outdoor Free Thermo Cube Blanket Cube Cube Tire no .: same as 17

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Example 13 (Fig. 22)

Festivity course: OB B400 FTB 6 hours HS PZ 375/475 Lab.Nr .: F0718-2 / 01 with silica foam, retarder and accelerator at: 07/18/01

Mixing time 11 a.m. 250 kg PZ 375 Ladce construction site 12 p.m. 250 kg PZ475 mixed in 12.15 p.m. 684 kg RKI 0/8 W + B 12.30 p.m. 908 kg EBK 11/22 170.0 kg water 0.0 kg 0.0 It air pores 0 .0 kg 2.0 It retarder 35.0 kg Microsilica 25.0 kg accelerator 0.0 kg fibers 9.0 It superplasticizer 0.0 kg FB weight 2.333 kg emoerature 27 'degrees air 26 degrees' concrete temperature

Fresh concrete weight without FM with FM cubes FB weight 2340 cm 50 LP pot FB weight 2328 kg / m kg / m3 It% 499 kg actual water. 200 0.40 air pores 5.2 z-value tsächl.PZ z value iqkeit: S = steel, K = plastic, T = thermo

Std Strength N / mm2 Std Strength N / mm2 Std Strength N / mm2 Free Outdoor Thermo Cube Blanket Cube Cube Maturity No .: same as 18

Claims (8)

AT 41 1 361 B In summary, a preferred exemplary embodiment of the invention can be represented as follows: When producing roadway concrete, in particular when repairing existing traffic areas, the concrete is mixed at the factory or on site and with or without the addition of 5 retarders, but with the addition of Superplasticizer used with or without the addition of accelerators. By monitoring (checking) the hardening process of concrete, based on the weighted maturity of the concrete, it is determined when the strength required for the traffic release, for example a strength of 50% of the final strength after 28 days, e.g. 20 N / mm2 is reached. io The strength of the concrete is determined by means of a calibration curve in which the weighted maturity is plotted against the compressive strength of a test specimen by determining the point in time at which the hardening process of the concrete has progressed so far from the weighted maturity of the inserted concrete determined on site is that the concrete can be released for use. 15 PATENT CLAIMS: 20 25 30 35 40 45 50 1. Process for the production of roadway concrete from traffic areas, in particular in the course of repairing existing traffic areas, characterized in that the road concrete is mixed at the factory or on site, that the road concrete with or without the addition of Retarders, but with the addition of plasticizer, with or without the addition of accelerators, are used to monitor (test) the hardening process of the road concrete using the weighted ripeness, in particular the C-value, of the road concrete using test specimens (cubes) that are thermally isolated form, it is determined that on the basis of the weighted ripeness determined on the test specimens, a calibration curve is drawn up in which the weighted ripeness is plotted against the cube compressive strength, that the weighted ripeness of the paved concrete introduced is determined on site, and that under Use the calibration curve to determine the point in time According to which the hardening process of the road concrete has progressed so far that the strength required for the traffic release, for example a strength of 50% of the final strength after 28 days, e.g. 20 N / mm2 is reached. 2.Procedure for the production of roadway concrete for traffic areas, characterized by the following steps - delivering the concrete mix, if necessary with mixing water according to the desired water / cement value and with a retarder, to the construction site, - moving the delivered concrete mix to the construction site with a plasticizer and if necessary with an accelerator, - mixing the concrete mix thus obtained on the construction site, - applying the road fluid concrete thus obtained on the construction site, for example for repairing traffic areas, eg of road surfaces. 3. The method according to claim 2, characterized in that the concrete mixture with mixing water and retarder is delivered to the construction site. 4. The method according to claim 2, characterized in that the concrete mixture is supplied to the construction site without mixing water and without a retarder, and that the delivered concrete mixture is mixed and mixed with mixing water on the construction site. 5. The method according to claim 2, characterized in that the concrete mixture with mixing water, retarders and additives, e.g. Silcafume, delivered to the construction site. 6. The method according to claim 2, characterized in that the concrete mixture with additives, e.g. Silcafume, but without mixing water and without delay is delivered to the construction site, and that the delivered concrete mix is mixed with mixing water at the construction site. 7. The method according to any one of claims 2 to 6, characterized in that the concrete 19 55 AT 41 1 361 B mixture with accelerator is added and mixed. 8. The method according to any one of claims 2 to 6, characterized in that mixing is carried out without an accelerator. TO THIS 16 SHEET OF DRAWINGS 20