CN109061117B - Material capable of simulating properties of fresh concrete - Google Patents
Material capable of simulating properties of fresh concrete Download PDFInfo
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- CN109061117B CN109061117B CN201810564093.9A CN201810564093A CN109061117B CN 109061117 B CN109061117 B CN 109061117B CN 201810564093 A CN201810564093 A CN 201810564093A CN 109061117 B CN109061117 B CN 109061117B
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- 239000000463 material Substances 0.000 title claims abstract description 78
- 239000004576 sand Substances 0.000 claims abstract description 45
- 239000000853 adhesive Substances 0.000 claims abstract description 40
- 230000001070 adhesive effect Effects 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 35
- 239000004575 stone Substances 0.000 claims description 24
- 229910052601 baryte Inorganic materials 0.000 claims description 2
- 239000010428 baryte Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 40
- 239000004568 cement Substances 0.000 abstract description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 2
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000004571 lime Substances 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- 239000008399 tap water Substances 0.000 description 9
- 235000020679 tap water Nutrition 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000003993 interaction Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000011056 performance test Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention relates to a material capable of simulating the properties of fresh concrete, which consists of the following components: the building adhesive comprises a building adhesive, water, sand, pebbles and barite powder, wherein the mass ratio of the building adhesive to the water to the sand to the pebbles to the barite powder is 1: 0.02-0.06: 2.3-2.7: 2.3-2.7: 1.15 to 1.35. The invention has the following advantages: (1) because the properties of all the components are stable and do not change along with time, the chemical reaction among all the components can not occur, and simultaneously, hydraulic materials such as cement or air-hardening materials such as lime or the like are not contained, the properties of the simulation material are stable; (2) the simulation material does not bleed, and after standing for several days, if precipitation occurs, the simulation material can be stirred again, and the material is restored to the original state; (3) the simulation material is easy to obtain and low in price; (4) the simulation material is harmless to human body.
Description
Technical Field
The invention belongs to the field of civil engineering and construction machinery, and particularly relates to a material capable of simulating the properties of fresh concrete.
Background
When the fresh concrete is conveyed through the pipeline, an interaction force exists between the fresh concrete and the pipeline. The interaction between fresh concrete and the pipeline is usually studied by experimental methods, which require that the properties of the fresh concrete do not change during the test. However, as the cement hydration reaction proceeds, the light concrete gradually coagulates and loses fluidity, and after the light concrete enters initial setting, the light concrete begins to lose plasticity and the property changes continuously, so that the light concrete used in the test cannot be reused, and therefore, the light concrete needs to be reconfigured in each test, and the material waste is caused. Meanwhile, even if the same raw materials and stirring process are adopted, due to the fact that the properties of the fresh concrete have discreteness and the properties of different batches of concrete are different, data of interaction force between the concrete and the pipeline cannot be compared. Therefore, a material which can simulate the properties of fresh concrete and has the characteristics of stable properties and reusability needs to be developed. As can be seen from the literature, no such simulation material exists at present.
Disclosure of Invention
In order to overcome the defects in the prior art and research on interaction force of concrete and pipelines, the invention provides a material capable of simulating the properties of fresh concrete.
A material capable of simulating the properties of fresh concrete, said material consisting of: the building adhesive comprises a building adhesive, water, sand, pebbles and barite powder, wherein the mass ratio of the building adhesive to the water to the sand to the pebbles to the barite powder is 1: 0.02-0.06: 2.3-2.7: 2.3-2.7: 1.15 to 1.35.
Preferably, the building adhesive is 901 building adhesive. Can provide viscosity, and the building adhesive is used for bonding the silt particles together to play a role in bonding.
Preferably, the sand is silt. The silt is used as the fine aggregate of the simulation material, and the simulation material has the advantage of difficult sedimentation.
Preferably, the stones are crushed stones. The broken stone is used as coarse aggregate of the simulation material to play a role of a skeleton.
Preferably, the fineness of the barite is 200 meshes. The density of the simulated material is increased by the barite powder.
Preferably, the mass ratio of the building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.5: 2.5: 1.25.
the invention has the beneficial effects that:
(1) because the properties of all components of the simulation material are stable and do not change along with time, chemical reaction does not occur among all the components, and meanwhile, the simulation concrete does not contain hydraulic materials such as cement or air-hardening materials such as lime, the simulation material has stable properties;
(2) the simulation material does not bleed, and after standing for several days, if precipitation occurs, the simulation material can be stirred again, and the material is restored to the original state;
(3) the simulation material is easy to obtain and low in price;
(4) the simulation material is harmless to human body.
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention.
Proportion and property of fresh concrete
The mass ratio of the fresh concrete is cement: water: sand: stone 1: 0.72: 3.01: 3.76.
the cement is M42.5 ordinary portland cement;
the water is tap water; the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm.
The slump of the fresh concrete is 194mm and the density is 2.41 multiplied by 103kg/m3。
The initial setting time is 3h and the final setting time is 6 h.
In the specific implementation of the invention, the slump of the simulated material is considered to be 190-198 mm, and the density is 2.37 multiplied by 103～2.46×103kg/m3And the method can be used for simulating fresh concrete.
Concrete slump test:
standard of Performance test method for ordinary concrete mixture GB/T50080-2016
(1) Test apparatus and process
The instrument that this experiment adopted is the slump bucket.
Step 1: preparing the mixed concrete, preparing a slump bucket, a shovel and other related equipment, placing the slump bucket on a non-water-absorbing rigid flat plate, placing a funnel on the slump cone, and treading pedals on two sides by feet to keep the position of the slump cone fixed during charging.
Step 2: the mixture is put into a barrel in three layers, and the height of each layer is about one third of the height of the barrel; tamping each layer 25 times from edge to center along spiral line with a tamping rod; each inserting and tamping is uniformly distributed on the interface; when the concrete at the cylinder edge is inserted and tamped, the tamping rod can be slightly inclined; when the bottom layer is inserted and tamped, the tamping rod penetrates the whole depth, and when the other two layers are inserted and tamped, the tamping rod is inserted through the bottom layer and is inserted into the lower layer by about 20-30 mm.
And step 3: after filling, scraping redundant mixture by using a trowel, leveling the opening of the cylinder, and removing concrete around the bottom of the cylinder; and then immediately lifting the slump cone, wherein the lifting of the slump cone is completed within 5-10 s, and the concrete is not influenced by transverse and torsion forces. The whole process from the start of charging to the lifting of the slump cone should be completed within 150 s.
And 4, step 4: and after the slump cone is lifted, the slump cone is placed beside the cone concrete sample, and the height difference between the cone height and the highest point of the concrete mixture sample after the slump is measured, namely the slump value of the concrete mixture, wherein the numerical value is accurate to 1 mm.
And 5: taking the arithmetic mean value of the two test results as a measured value, and accurately measuring the value to 1 mm; when the error of the two test values is more than 10mm, the measurement should be re-sampled.
Density test of concrete
Standard of Performance test method for ordinary concrete mixture GB/T50080-2016
(1) Test apparatus and process
The instrument used for this experiment was a 2L volume barrel.
The concrete density determination test process comprises the following steps:
step 1: wiping the inner surface of the volume barrel with a wet cloth, and weighing the mass m of the volume barrel1To the nearest 5 g.
Step 2: fresh concrete is added to the containment drum and compacted (either manually or mechanically).
And step 3: scraping the excessive concrete mixture at the barrel opening after tamping to level the surface of the sand concrete, wiping off the concrete on the outer wall, and weighing the total mass m of the concrete and the volume barrel2To the nearest 5 g.
And 4, step 4: calculating the density of the concrete:
the parameters in the formula are as follows:
rho-density of freshly mixed concrete, kg/m3
m1-volume bucket mass, kg
m2Total mass of concrete and containment drum, kg
V-volume of the barrel, L
And 5: taking the arithmetic mean value of the results of the two tests, and obtaining the precision of 10kg/m3。
Measuring initial setting and final setting time of concrete:
the initial setting time of cement refers to the time required from the time cement is added with water until the cement paste begins to lose plasticity, and the final setting time refers to the time required from the time cement is added with water and mixed until the cement paste completely loses plasticity and begins to generate strength. Since the initial setting time and the final setting time of concrete are related to the type of cement, the initial setting time and the final setting time of concrete can be roughly determined by an observation method.
And (3) judging initial setting: an iron rod is selected and slightly touched to the concrete surface, if the fluidity is lost, or the iron rod slides, scratches can be left on the surface, and the initial setting is indicated.
And (3) judging final setting: an iron rod is selected, the concrete surface is slightly knocked, if the sound of fine hard object collision can be heard, the plasticity is completely lost, a certain strength is generated, and the final setting is reached.
Example 1
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.5: 2.5: 1.25.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 195mm and the density 2.42X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept still for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 194mm and the density is 2.43 multiplied by 103kg/m3(ii) a Standing for 96 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 194mm and the density to be 2.43 multiplied by 103kg/m3. Visible mouldThe slump and the density of the pseudo concrete are close to those of fresh concrete, the property is stable, and the pseudo concrete can be repeatedly used.
Example 2
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.02: 2.3: 2.3: 1.15.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 197mm and the density 2.39X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept stand for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is measured to be 197mm, and the density is measured to be 2.39 multiplied by 103kg/m3(ii) a Standing for 72 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 196mm and the density to be 2.40 multiplied by 103kg/m3. Therefore, the slump and the density of the simulated concrete are close to those of fresh concrete, the property is stable, and the simulated concrete can be repeatedly used.
Example 3
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.06: 2.7: 2.7: 1.35.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 192mm and the density was measured to be 2.45X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept stand for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 191mm and the density is 2.45 multiplied by 103kg/m3(ii) a Standing for 72 hours, observing that the simulation material is slightly precipitated, and measuring that the slump of the simulation concrete is 191mm and the density is 2.46 multiplied by 10 after re-stirring3kg/m3. Therefore, the slump and the density of the simulated concrete are close to those of fresh concrete, the property is stable, and the simulated concrete can be repeatedly used.
Example 4
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.5: 2.5: 1.18.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 196mm and the density was measured to be 2.39X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept stand for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 196mm and the density is 2.39 multiplied by 103kg/m3(ii) a Standing for 96 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 195mm and the density to be 2.40 multiplied by 103kg/m3. Slump and slump of the visible simulated concreteThe density is close to that of the fresh concrete, the property is stable, and the concrete can be repeatedly used.
Example 5
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.35: 2.65: 1.2.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was found to be 194mm and the density was found to be 2.44X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept still for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 194mm and the density is 2.44 multiplied by 103kg/m3(ii) a Standing for 96 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 193mm and the density to be 2.45 multiplied by 103kg/m3. Therefore, the slump and the density of the simulated concrete are close to those of fresh concrete, the property is stable, and the simulated concrete can be repeatedly used.
Example 6
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.03: 2.5: 2.5: 1.2.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 193mm and the density 2.40X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept still for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 192mm and the density is 2.41 multiplied by 103kg/m3(ii) a Standing for 72 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 192mm and the density to be 2.41 multiplied by 103kg/m3. Therefore, the slump and the density of the simulated concrete are close to those of fresh concrete, the property is stable, and the simulated concrete can be repeatedly used.
Example 7
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.05: 2.6: 2.5: 1.3.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 192mm and the density was measured to be 2.44X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept stand for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is 192mm and the density is 2.44 multiplied by 103kg/m3(ii) a Standing for 96 hours, observing that the simulation material is slightly precipitated, and measuring that the slump of the simulation concrete is 191mm and the density is 2.45 multiplied by 10 after re-stirring3kg/m3. It can be seen that the slump and the density of the simulated concrete are close to those of fresh concreteThe product has stable property and can be repeatedly used.
Example 8
A material capable of simulating the properties of fresh concrete, said material consisting of: 901 building adhesive, water, sand, pebble and barite powder, wherein the mass ratio of the 901 building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.4: 2.4: 1.2.
the sand is fine aggregate and is silt; the stones are coarse aggregates and broken stones, and the particle size is 5-20 mm; 901 building adhesive, Zhongnan brand, can provide viscosity to bond sand grains together; the barite powder can increase the density of the simulation material, and the fineness is 200 meshes; the slump of the simulated concrete can be adjusted by water, and the simulated concrete is tap water.
The slump of the simulated concrete was measured to be 197mm and the density 2.39X 103kg/m3And the slump and the density of the concrete are close to those of the fresh concrete, and the concrete can be used for simulating the fresh concrete.
The simulated concrete is kept stand for 48 hours, the observation shows that the simulated material is not obviously precipitated, and the slump of the simulated concrete is measured to be 197mm, and the density is measured to be 2.39 multiplied by 103kg/m3(ii) a Standing for 96 hours, observing that the simulation material is slightly precipitated, and measuring the slump of the simulation concrete after re-stirring to be 196mm and the density to be 2.40 multiplied by 103kg/m3. Therefore, the slump and the density of the simulated concrete are close to those of fresh concrete, the property is stable, and the simulated concrete can be repeatedly used.
Claims (5)
1. A material capable of simulating the properties of fresh concrete is characterized in that: the material consists of the following components: the building adhesive comprises a building adhesive, water, sand, pebbles and barite powder, wherein the mass ratio of the building adhesive to the water to the sand to the pebbles to the barite powder is 1: 0.02-0.06: 2.3-2.7: 2.3-2.7: 1.15 to 1.35; the building adhesive is 901 building adhesive.
2. The material capable of simulating the properties of fresh concrete according to claim 1, wherein: the sand is silt.
3. The material capable of simulating the properties of fresh concrete according to claim 1, wherein: the stones are broken stones.
4. The material capable of simulating the properties of fresh concrete according to claim 1, wherein: the fineness of the barite is 200 meshes.
5. The material capable of simulating the properties of fresh concrete according to claim 1, wherein: the mass ratio of the building adhesive to the water to the sand to the pebble to the barite powder is 1: 0.04: 2.5: 2.5: 1.25.
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