CN115872665B - Additive for prolonging plastic retention time of concrete and preparation method of concrete - Google Patents
Additive for prolonging plastic retention time of concrete and preparation method of concrete Download PDFInfo
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- CN115872665B CN115872665B CN202211690269.8A CN202211690269A CN115872665B CN 115872665 B CN115872665 B CN 115872665B CN 202211690269 A CN202211690269 A CN 202211690269A CN 115872665 B CN115872665 B CN 115872665B
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- 239000004567 concrete Substances 0.000 title claims abstract description 160
- 239000000654 additive Substances 0.000 title claims abstract description 86
- 230000000996 additive effect Effects 0.000 title claims abstract description 86
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 73
- 229920003023 plastic Polymers 0.000 title claims abstract description 71
- 239000004033 plastic Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 153
- 108010073771 Soybean Proteins Proteins 0.000 claims abstract description 80
- 235000019710 soybean protein Nutrition 0.000 claims abstract description 77
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 55
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 44
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000011372 high-strength concrete Substances 0.000 claims abstract description 25
- HTJDQJBWANPRPF-UHFFFAOYSA-N Cyclopropylamine Chemical group NC1CC1 HTJDQJBWANPRPF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001509 sodium citrate Substances 0.000 claims abstract description 21
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 21
- 230000001603 reducing effect Effects 0.000 claims abstract description 20
- 239000012452 mother liquor Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims description 45
- 238000002156 mixing Methods 0.000 claims description 32
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 31
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 31
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 31
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 31
- 229920002401 polyacrylamide Polymers 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- 238000007598 dipping method Methods 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 27
- 235000010469 Glycine max Nutrition 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- 235000019750 Crude protein Nutrition 0.000 claims description 15
- 244000068988 Glycine max Species 0.000 claims description 15
- 239000011268 mixed slurry Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 238000010298 pulverizing process Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 229940001941 soy protein Drugs 0.000 claims description 3
- 235000012054 meals Nutrition 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 17
- 238000007906 compression Methods 0.000 description 36
- 230000006835 compression Effects 0.000 description 36
- 238000005336 cracking Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 18
- 230000000740 bleeding effect Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 14
- 238000003618 dip coating Methods 0.000 description 14
- 230000009286 beneficial effect Effects 0.000 description 13
- 239000011361 granulated particle Substances 0.000 description 12
- 230000002265 prevention Effects 0.000 description 12
- 230000035939 shock Effects 0.000 description 12
- 238000007873 sieving Methods 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000005469 granulation Methods 0.000 description 5
- 230000003179 granulation Effects 0.000 description 5
- 230000004927 fusion Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000019764 Soybean Meal Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 125000005341 metaphosphate group Chemical group 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 239000004455 soybean meal Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
An additive for prolonging the plastic retention time of concrete and a preparation method of the concrete, which belong to the technical field of the concrete, wherein the additive comprises a water-reducing component, a slow-release component and a water-retaining component, and the mass ratio of the water-reducing component to the slow-release component is (20-40) and (1-2); the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene or sodium citrate. The additive product can meet the requirement that high-strength concrete is developed towards the directions of high strength, high flow and high durability. The plastic retention time of the concrete after the additive is added is 12-48 hours, the plastic retention time is greatly prolonged, and the later strength of the concrete is not influenced.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to an additive for prolonging the plastic retention time of concrete and a preparation method of the concrete.
Background
The plastic retention of concrete means a state of flowing concrete in a short time, and the larger the fluidity is, the poor plasticity is, the smaller the fluidity is, and the good plasticity is. However, in high-rise buildings or large-area construction, pumping concrete is required, and the pumping concrete is often required to be transported for a long distance or be constructed under a higher temperature condition, so that the fluidity of the concrete is required to be improved and the plasticity of the concrete is required to be ensured.
At present, in order to solve the balance problem of concrete fluidity and plasticity retention, a water reducer (such as lignin sulfonate, naphthalene sulfonate water reducer, melamine water reducer, powder polycarboxylate water reducer and the like) is added, but the slump loss of high-strength concrete doped with the water reducer is larger than that of ordinary concrete not doped with the water reducer, so that the concrete engineering quality is affected. At present, most manufacturers adopt water reducing agents to mix with common air entraining agents and retarder agents, such as saponin air entraining agents, alkyl aromatic hydrocarbon sulfonic acid air entraining agents, phosphate or metaphosphate concrete retarder, molasses or hydroxycarboxylic acid retarder and the like to prepare the composite plastic retention agent, and the plastic retention time can be about 9 hours.
The plastic-retaining agent can achieve a certain plastic-retaining effect, but has a great gap for high-strength and high-performance concrete, and because a large amount of superfine active mineral admixture and extremely low water-gel ratio are adopted in the preparation process of the high-strength concrete, the shrinkage of the high-strength concrete is larger and can reach more than ten parts per million, and the brittleness of the high-strength concrete is gradually increased along with the continuous improvement of the compressive strength. Therefore, the common plastic retention agent can not meet the use requirement of high-strength concrete, and the adaptive use performance of the plastic retention agent needs to be continuously improved.
Disclosure of Invention
The plastic-retaining agent aims at solving the problems that the common plastic-retaining agent in the prior art can not meet the higher use requirement of high-strength concrete, can not meet the long plastic-retaining time and influence the later strength reduction of the concrete. According to the admixture for prolonging the plastic retention time of the concrete and the preparation method of the concrete, the special treated composite admixture can prolong the plastic retention time of high-strength concrete by 12-48 hours, and meanwhile, the admixture is free from influencing the later strength of the high-strength concrete, has good adaptability to water reducing agents, can improve the water reducing rate and the workability of the polycarboxylic acid water reducing agents, and reduces bleeding. The specific technical scheme is as follows:
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is (20-40) and the water-retaining component is (1-2); the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene or sodium citrate.
The slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio of HEDP to aminotrimethylene= (5-10) is (20-30).
The slow-release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate= (3-5) is (20-30).
The soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with granularity of 30-80 um, then adding water to wet until the water content reaches 15-25%, granulating, wherein the granulating particle is 0.5-2 mm; and drying the particles until the water content is 4-7%, then carrying out dip coating on the surfaces of the particles, and drying to obtain the modified soybean protein.
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water= (0.2-0.4): 1:6.
The soybean crude protein is extracted from defatted soybean meal, and the extraction process is the prior art.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 20-40 kg of slow-release component and 200kg of water-reducing component into each ton of concrete mixture, uniformly mixing, and finally adding 1-2 kg of water-retaining component, mixing for 20-30 min to obtain the concrete with the plastic retention time of 12-48 hours.
In the method, the concrete mixture is high-strength concrete mixture, and the strength is more than 65 MPa.
In the method, the concrete mixture is a pumped concrete mixture.
Compared with the prior art, the additive for prolonging the open time of the ready-mixed mortar and the preparation method of the mortar have the beneficial effects that:
1. The polycarboxylate water reducer mother liquor is used as a high-strength water reducer, and the water reducing effect is good. However, the fusion adaptability of the polycarboxylate water reducer mother liquor and other components is poor, the slow-release component is designed to be a mixture of HEDP and aminotrimethylene or sodium citrate, and the modified soybean protein is designed to be used as a water-retaining component, so that the adaptability of the modified soybean protein and the polycarboxylate water reducer mother liquor is good. After the soybean protein granulation particles are subjected to dip coating by using polyacrylamide and sodium carboxymethylcellulose mixed slurry, the defects of the granulation surface are overcome, and the polyacrylamide can reduce friction resistance, so that the fusion property of the water retention component and the mother solution of the polycarboxylate water reducer is improved; sodium carboxymethyl cellulose is used as a coating layer, so that on one hand, the slow release effect can be realized, on the other hand, the filling property is provided for compensating the granulation defect, so that the granulation is firmer, the rapid collapse is avoided in the subsequent mixing, the granulation stability of the modified soybean protein is ensured, and the effect durability of the water-retaining component is further ensured.
2. Compared with pure soybean protein powder, the granulated and modified soybean protein has better water retention effect and better fusion effect with a water reducer. The granulated and modified soybean protein can be released in a layered manner within 28 days, the water retention progress and effect are prolonged, and the granulated and modified soybean protein can be matched with a water reducing component and a slow release component for use, so that the water reducing rate and the construction performance can be improved, and bleeding is reduced.
3. The modified soy protein has good dispersibility, is not easy to agglomerate in concrete mixing, and has lower cohesiveness and uniform distribution after sodium carboxymethylcellulose is partially disintegrated after concrete mixing, so that uneven quick shrinkage cracking of concrete is effectively prevented, the shrinkage rate is reduced, and further the post-stage concrete strength is guaranteed and improved.
4. The additive product can meet the requirement that high-strength concrete is developed towards the directions of high strength, high flow and high durability. The plastic retention time of the concrete after the additive is added is 12-48 hours, the plastic retention time is greatly prolonged, and the later strength of the concrete is not influenced.
5. In the additive adding method, the water-retaining component is added finally and mixed for 20-30 min, so that the structure of the water-retaining component is kept complete during mixing to the greatest extent, complete disintegration does not occur, the layered release time of the water-retaining component in the coagulation process is prolonged, and the 28d utility time is prolonged.
6. The mixture of HEDP and aminotrimethylene or sodium citrate is used as a slow-release component to delay the initial setting and final setting time of concrete without affecting the later strength of the concrete, and the water reducing rate can be improved when the mixture is matched with the polycarboxylate water reducing agent mother liquor.
Detailed Description
The invention will be further illustrated with reference to specific examples, but the invention is not limited to these examples.
Example 1
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:33:1.5; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio of HEDP to aminotrimethylene=8:25.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 50um, then adding water to wet until the water content reaches 18%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 6%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
the dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.3:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
and adding 33kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1.5kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 35 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.7MPa and the total shrinkage rate of 0.13 per mill; the compressive strength of the blank test piece concrete 28d is 65.5MPa, and the total shrinkage rate is 0.15 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 2
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:29:1.5; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate=4:25.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 50um, then adding water to wet until the water content reaches 18%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 6%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
the dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.3:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
and adding 29kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1.5kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 22 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.8MPa and the total shrinkage rate of 0.11 per mill; the compressive strength of the blank test piece concrete 28d is 65.7MPa, and the total shrinkage rate is 0.14 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 3
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:25:1; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio of HEDP to aminotrimethylene=5:20.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 30um, then adding water to wet until the water content reaches 25%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 7%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.2:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
and adding 25kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 14 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 66.3MPa and the total shrinkage rate of 0.11 per mill; the compressive strength of the blank test piece concrete 28d is 66.1MPa, and the total shrinkage rate is 0.14 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 4
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:23:1; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate=3:20.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 30um, then adding water to wet until the water content reaches 25%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 7%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.2:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
and adding 23kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 12.5 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.3MPa and the total shrinkage rate of 0.09 per mill; the compressive strength of the blank test piece concrete 28d is 65.3MPa, and the total shrinkage rate is 0.13 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 5
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:40:2; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio is HEDP to aminotrimethylene=10:30.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 80um, then adding water to wet until the water content reaches 15%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 4%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.4:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 40kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 2kg of water-retaining component, and mixing for 30min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 48 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 67.3MPa and the total shrinkage rate of 0.11 per mill; the blank test piece concrete 28d has a compressive strength of 67.1MPa and a total shrinkage of 0.15 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 6
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:35:2; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate=5:30.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 80um, then adding water to wet until the water content reaches 15%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 4%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.4:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 35kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 2kg of water-retaining component, and mixing for 30min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 42 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.2MPa and the total shrinkage rate of 0.12 per mill; the compressive strength of the blank test piece concrete 28d is 65.0MPa, and the total shrinkage rate is 0.16 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 7
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:35:1; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio of HEDP to aminotrimethylene=5:30.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 30um, then adding water to wet until the water content reaches 15%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 7%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.4:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 35kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 38.5 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 68.3MPa and the total shrinkage rate of 0.09 per mill; the compressive strength of the blank test piece concrete 28d is 68.0MPa, and the total shrinkage rate is 0.12 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 8
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:33:2; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate=3:30.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 30um, then adding water to wet until the water content reaches 15%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 7%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.4:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 33kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 2kg of water-retaining component, and mixing for 20min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 38 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 67.4MPa and the total shrinkage rate of 0.09 per mill; the blank test piece concrete 28d has a compressive strength of 67.3MPa and a total shrinkage of 0.11 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 9
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:30:1; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio is HEDP to aminotrimethylene=10:20.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 80um, then adding water to wet until the water content reaches 25%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 4%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.2:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 30kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1kg of water-retaining component, and mixing for 30min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 29.5 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the advantages of compression resistance, shock resistance, no cracking, 66.6MPa of concrete 28d compression strength and 0.10 per mill total shrinkage rate after test; the compressive strength of the blank test piece concrete 28d is 66.4MPa, and the total shrinkage rate is 0.13 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 10
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is that the water-retaining component=200:25:1; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate=5:20.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 80um, then adding water to wet until the water content reaches 25%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 4%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.2:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 25kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1kg of water-retaining component, and mixing for 30min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 15 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.4MPa and the total shrinkage rate of 0.10 per mill; the compressive strength of the blank test piece concrete 28d is 65.3MPa, and the total shrinkage rate is 0.12 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 11
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:29:1.6; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio is HEDP to aminotrimethylene=7:22.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with a median particle size of 45um, then adding water to wet until the water content reaches 22%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 5%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
the dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.3:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 29kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1.6kg of water-retaining component, and mixing for 25min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 24.5 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 65.8MPa and the total shrinkage rate of 0.11 per mill; the compressive strength of the blank test piece concrete 28d is 65.7MPa, and the total shrinkage rate is 0.14 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Example 12
The additive for prolonging the plastic retention time of the concrete comprises a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component=200:30.5:1.4; the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is soybean protein extract; the slow release component is a mixture of HEDP and sodium citrate, and the mass ratio is HEDP to sodium citrate=4.5:26.
Wherein: the soybean protein extract is modified soybean protein, and the preparation method of the modified soybean protein comprises the following steps: pulverizing soybean crude protein into powder with median granularity of 60um, then adding water to wet until the water content reaches 17%, granulating, and sieving after granulating to ensure that the range of the granulated particles is 0.5-2 mm; drying the particles until the water content is 6%, then carrying out dip coating on the surfaces of the particles, and drying to obtain modified soybean protein;
The dipping coating liquid for dipping coating the particle surface is mixed slurry of polyacrylamide and sodium carboxymethyl cellulose, and the polyacrylamide is as follows: sodium carboxymethyl cellulose: water=0.2:1:6.
The additive for prolonging the plastic retention time of the concrete is used for preparing the concrete and comprises the following steps of:
And adding 30.5kg of slow-release component and 200kg of water-reducing component into each ton of high-strength concrete mixture, uniformly mixing, and finally adding 1.4kg of water-retaining component, and mixing for 30min to obtain the concrete.
The additive of the embodiment has good effect through a comparison test, and the plastic retention time of the concrete after the additive is added is 30.5 hours, so that the plastic retention time is greatly prolonged.
In the embodiment, a cubic concrete test piece with the side length of 150mm is adopted as a standard size test piece, a blank test piece (without additive) and a sample test piece (with additive) are respectively prepared, the two test pieces are cured for 28d in moist air or water with the temperature of (20+/-3) DEG C and the relative humidity of more than 90 percent, and the sample test piece has the compression resistance, shock resistance and cracking resistance, the compression strength of the concrete 28d of 66.2MPa and the total shrinkage rate of 0.13 per mill; the compressive strength of the blank test piece concrete 28d is 66.2MPa, and the total shrinkage rate is 0.14 per mill. The admixture of the embodiment does not influence the strength of concrete after being added, has good adaptability with the polycarboxylate water reducer, can improve the water reduction rate and the construction performance of the polycarboxylate water reducer, reduces bleeding, reduces the total shrinkage, and is beneficial to cracking prevention, compression resistance and earthquake resistance.
Claims (5)
1. The admixture for prolonging the plastic retention time of the concrete is characterized by comprising a water-reducing component, a slow-release component and a water-retaining component, wherein the mass ratio of the water-reducing component to the slow-release component is (20-40) and the water-retaining component is (1-2); the water reducing component is polycarboxylate water reducing agent mother liquor; the water-retaining component is a soy protein extract; the slow release component is a mixture of HEDP and aminotrimethylene or sodium citrate;
The soybean protein extract is modified soybean protein, and the preparation method comprises the following steps: pulverizing soybean crude protein into powder with granularity of 30-80 um, then adding water to wet until the water content reaches 15-25%, granulating, wherein the granulating particle is 0.5-2 mm; the particles are dried until the water content is 4-7%, then the surface of the particles is dipped and coated, and the dipping coating liquid is polyacrylamide and sodium carboxymethyl cellulose mixed slurry, and the polyacrylamide is prepared by the following steps: sodium carboxymethyl cellulose: water= (0.2-0.4) 1:6; drying to obtain modified soybean protein;
The method for prolonging the plastic retention time of the concrete by the additive comprises the following steps: adding 20-40 kg of slow-release component and 200kg of water-reducing component into each ton of concrete mixture for uniform mixing; finally adding 1-2 kg of water-retaining component, mixing for 20-30 min to obtain concrete, and retaining plastic for 12-48 hr;
The concrete mixture is a high-strength concrete mixture, and the strength is more than 65 MPa.
2. The admixture for prolonging the plastic retention time of concrete according to claim 1, wherein the slow release component is a mixture of HEDP and aminotrimethylene, and the mass ratio of HEDP to aminotrimethylene= (5-10) to (20-30).
3. The admixture for prolonging the plastic retention time of concrete according to claim 1, wherein the slow-release component is a mixture of HEDP and sodium citrate, and the mass ratio of HEDP to sodium citrate= (3-5) to (20-30).
4. An admixture for extending the retention time of concrete according to claim 1, wherein said crude soy protein is extracted from defatted soy meal.
5. An admixture for extending the retention time of concrete according to claim 1 wherein the concrete mix is a pumped concrete mix.
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