CN110451854B - Light waterproof concrete block for river channel and preparation method thereof - Google Patents

Light waterproof concrete block for river channel and preparation method thereof Download PDF

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Publication number
CN110451854B
CN110451854B CN201910668644.0A CN201910668644A CN110451854B CN 110451854 B CN110451854 B CN 110451854B CN 201910668644 A CN201910668644 A CN 201910668644A CN 110451854 B CN110451854 B CN 110451854B
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concrete block
parts
portions
curing
waterproof
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CN110451854A (en
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王宝玲
甄静
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Beijing Pinggu District Water Conservancy Engineering Co
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Beijing Pinggu District Water Conservancy Engineering Co
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00008Obtaining or using nanotechnology related materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, e.g. waterproof or water-repellant materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention relates to a light waterproof concrete block for a river channel and a preparation method thereof, belonging to the technical field of river channel treatment engineering. This a light waterproof concrete block for river course, it not only has the advantage of good waterproof nature, good compactedness, higher strength, has the advantage that the quality is light, low price moreover, simultaneously in the preparation process, has reduced the condition emergence that its surface produced the crack, has improved the yield, is applicable to in the lead wire gabion in the river course revetment construction.

Description

Light waterproof concrete block for river channel and preparation method thereof
Technical Field
The invention relates to the technical field of river channel treatment engineering, in particular to a lightweight waterproof concrete block for a river channel and a preparation method thereof.
Background
The concrete is obtained by mixing cement as a cementing material, sand and stone as aggregates, water and an additive according to a certain proportion and stirring, has the advantages of easy molding, low energy consumption, low price and the like, is widely applied to buildings, and plays an important role in the social development of human beings.
In recent years, with the continuous development of the concrete industry, concrete is also applied to the technical field of river bank protection engineering construction, such as concrete bank protection bricks on two sides of a river. In the river course shore protection work progress, generally adopt to pack certain specification, the building stones that satisfy the requirement to the lead wire gabion intussuseption to form from pervious to water, flexible, ecological protective structure, the lead wire gabion plays the effect of a bank protection, banket, but the lead wire gabion generally adopts the building stones to fill, and it packs to replace building stones with concrete block at a minimum, consequently, need study a light waterproof concrete block who is exclusively used in the lead wire gabion urgently.
Disclosure of Invention
The invention aims to provide a light waterproof concrete block for a river channel, which has the advantages of good waterproofness, good compactness and high strength, has the advantages of light weight and low price compared with stone materials, and is suitable for lead wire gabions in river channel bank protection construction.
The technical purpose of the invention is realized by the following technical scheme:
the light waterproof concrete block for the river channel comprises, by weight, 140 parts of water-containing material 110, 320 parts of cement-containing material 250, 90-110 parts of broken stone, 1100 parts of ceramsite-containing material 900, 50-110 parts of slag powder, 40-80 parts of fly ash and 10-50 parts of composite waterproof admixture, wherein the composite waterproof admixture comprises 250 parts of water-containing material 190, 30-60 parts of water reducing agent, 55-80 parts of sodium methyl silanol, 0.06-0.1 part of sodium dodecyl sulfate, 0.09-0.13 part of heavy calcium carbonate, 1-3 parts of calcium acrylate, 0.07-0.2 part of calcium hydroxide, 18-23 parts of sodium silicate, 1-5 parts of micro silicon powder, 0.1-0.5 part of nano aluminum oxide, 0.3-0.6 part of titanium dioxide, 3-6 parts of volcanic ash and 1-3 parts of polypropylene fiber.
By adopting the technical scheme, the composite waterproof admixture enters the interior of the concrete block and chemically reacts with free alkaline substances to form crystals which can effectively block capillary channels and cracks in the concrete block, so that the compactness of the concrete block is increased, the waterproofness and the strength of the concrete block are improved, and the concrete block has the advantages of good waterproofness, good compactness and high strength through the mutual synergistic effect of the raw materials of the concrete block, and has the advantages of light weight and low price compared with stone.
Preferably, the raw materials comprise 135 parts of water (120-), 295 parts of cement (263-), 95-105 parts of gravel, 1060 parts of ceramsite 980-), 68-100 parts of slag powder, 51-67 parts of fly ash and 24-40 parts of composite waterproof admixture, wherein the composite waterproof admixture comprises 235 parts of water (205-), 38-55 parts of water reducing agent, 60-75 parts of sodium methyl silanol, 0.07-0.09 part of sodium dodecyl sulfonate, 0.1-0.12 part of heavy calcium carbonate, 1.5-2.5 parts of calcium acrylate, 0.11-0.18 part of calcium hydroxide, 19-21 parts of sodium silicate, 2.5-4.1 parts of micro silicon powder, 0.28-0.42 part of nano aluminum oxide, 0.4-0.5 part of titanium dioxide, 3.5-5 parts of volcanic ash and 1.5-2.2 parts of polypropylene fiber.
By adopting the technical scheme, the raw materials of the concrete block are further optimized, and the waterproofness, compactness and strength of the concrete block are improved.
More preferably, the mass ratio of the micro silicon powder to the nano aluminum oxide is 10: 1.
By adopting the technical scheme, the mass ratio of the micro silicon powder to the nano aluminum oxide is further optimized, and the waterproofness, compactness and strength of the concrete block are improved.
More preferably, the polypropylene fiber is a mixture of long fiber and short fiber, and the mass ratio of the long fiber to the short fiber is 1: 6.
By adopting the technical scheme, the long fibers and the short fibers are matched with each other, so that the segregation of aggregates can be effectively prevented, the polypropylene fibers are uniformly dispersed in the concrete block, a disorderly support system is formed, the directional stress of the concrete block is dispersed, the occurrence and the development of early-stage concrete block plastic cracks are prevented, and the service life of the concrete block is prolonged.
More preferably, the average particle size of the nano-alumina is 20-50nm, and the average particle size of the titanium dioxide is 100-300 nm.
More preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
By adopting the technical scheme, the nano-alumina and the nano-titania are optimized, so that the nano-agglomeration phenomenon is reduced, and the nano-alumina, the nano-titania and the raw materials are mixed more uniformly.
More preferably, the light waterproof concrete block is in the shape of one of a cuboid, a cylinder and a regular hexagonal prism.
By adopting the technical scheme, the shape of the concrete block is limited, and the processing of the concrete block is convenient.
More preferably, the composite waterproof admixture is prepared by adopting the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 65-75 ℃, stirring for 1-2h, then adding micro silicon powder, nano alumina, titanium dioxide, polypropylene fiber, volcanic ash and a water reducing agent, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
By adopting the technical scheme, the raw materials are mixed more uniformly, the processing period is shortened, and the practicability is improved.
The second purpose of the present invention is to provide a method for preparing the above-mentioned lightweight waterproof concrete block for a river channel, which reduces the occurrence of cracks on the surface and improves the yield of the concrete block.
The technical purpose of the invention is realized by the following technical scheme:
a method for preparing the light waterproof concrete block for the river channel comprises the following steps:
(1) stirring and uniformly mixing all the raw materials to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out first maintenance on the primary finished product with the mold to obtain a semi-finished product;
(3) and demolding and cutting the semi-finished product, and then sequentially carrying out secondary curing, tertiary curing and fourth curing to obtain the lightweight waterproof concrete block.
By adopting the technical scheme, the first curing, the demolding, the block cutting, the second curing, the third curing and the fourth curing are adopted, and the condition that cracks are generated on the surface is reduced and the yield of the concrete blocks is improved through the mutual matching of the four curing.
More preferably, the temperature of the first curing is 35-40 ℃, the relative humidity is 70-80%, the pressure is 0.1MPa, and the curing time is 5-6h, the temperature of the second curing is 60-70 ℃, the relative humidity is 85-90%, the pressure is 0.1MPa, and the curing time is 1-2h, the temperature of the third curing is 160-170 ℃, the relative humidity is 85-90%, the pressure is 0.8MPa, and the curing time is 10-24h, the temperature of the fourth curing is 35-40 ℃, the relative humidity is 50-60%, the pressure is 0.1MPa, and the curing time is 5-6 d.
By adopting the technical scheme, the semi-finished product is subjected to primary curing and primary forming and has certain hardness, subsequent demolding and dicing are facilitated, then the semi-finished product is subjected to secondary curing, tertiary curing and quaternary curing, and meanwhile, in the tertiary curing, calcium hydroxide is separated out by hydration of cement, so that the semi-finished product can be combined with active silica and can also be combined with silica in a crystalline state to generate hydrous silicate crystals, the hardening of the cement is accelerated, the strength of the concrete block is improved, the condition that cracks are generated on the surface is reduced, and the yield of the concrete block is improved.
In conclusion, the invention has the following beneficial effects:
first, the lightweight waterproof concrete block for a river channel of the present invention has the advantages of good waterproofness, good compactness, and high strength, and has the advantages of light weight and low price compared with stone.
Secondly, through optimization of raw materials of the composite waterproof admixture, active particles enter the interior of the concrete block and chemically react with free alkaline substances to form crystals, and the crystals can effectively block capillary channels and cracks in the concrete block, so that the compactness of the concrete block is increased, and the waterproof performance and the strength of the concrete block are improved.
Thirdly, the mass ratio of the micro silicon powder to the nano aluminum oxide is further optimized, the connection strength between the concrete block raw materials is improved, and the waterproofness, compactness and strength of the concrete block are further improved.
Fourthly, the method for the lightweight waterproof concrete block for the river channel reduces the occurrence of cracks on the surface of the concrete block and improves the yield of the concrete block.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.
TABLE 1 content (Kg unit) of each raw material of the composite waterproof admixture
Composite waterproof additive A II III Fourthly Five of them
Water (W) 205 235 220 250 190
Water reducing agent 55 38 48 60 30
Sodium methylsiliconate 75 60 64 55 80
Sodium dodecyl sulfate 0.1 0.07 0.08 0.06 0.09
Ground calcium carbonate 0.13 0.1 0.11 0.09 0.12
Acrylic acid calcium salt 1 2.5 2.2 1.5 3
Calcium hydroxide 0.07 0.18 0.14 0.11 0.2
Sodium silicate 19 23 20 18 21
Silica fume 4.1 2.5 3.6 1 5
Nano alumina 0.41 0.25 0.36 0.1 0.5
Titanium dioxide 0.4 0.3 0.45 0.5 0.6
Volcanic ash 3.5 3 4.3 5 6
Polypropylene fiber 1 2.2 1.8 3 1.5
TABLE 2 concrete block of the examples the contents (unit: Kg) of the respective raw materials
Examples 1 2 3 4 5
Water (W) 110 140 130 120 135
Cement 250 263 275 320 295
Crushing stone 105 90 100 110 95
Ceramic particle 980 1100 1040 900 1060
Slag powder 50 110 85 100 68
Fly ash 80 40 55 51 67
Composite waterproof additive I 10 - - - -
Composite waterproof additive II - 24 - - -
Composite waterproof additive III - - 33 - -
Composite waterproof additive IV - - - 50 -
Composite waterproof additive five - - - - 40
Example 1
The light waterproof concrete block for river channel has material composition as shown in Table 1 and Table 2.
(1) Stirring and uniformly mixing water, cement, broken stone, ceramsite, slag powder, fly ash and a composite waterproof additive to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out first curing on the primary finished product with the mold under the conditions that the temperature is 35 ℃, the relative humidity is 70% and the pressure is 0.1MPa, wherein the curing time is 6 hours, and obtaining a semi-finished product;
(3) and demolding and cutting the semi-finished product, then gradually raising the temperature, wherein the temperature raising rate is 10 ℃/min, the second curing is carried out under the conditions that the temperature is 60 ℃, the relative humidity is 85% and the pressure is 0.1MPa, the curing time is 2h, then gradually raising the temperature and raising the pressure, the temperature raising rate is 5 ℃/min, the pressure raising rate is 0.2MPa/min, the third curing is carried out under the conditions that the temperature is 160 ℃, the relative humidity is 85% and the pressure is 0.8MPa, the curing time is 24h, then gradually lowering the temperature and lowering the pressure, the temperature lowering rate is 5 ℃/min, the pressure lowering rate is 0.2MPa/min, the third curing is carried out under the conditions that the temperature is 35 ℃, the relative humidity is 50% and the pressure is 0.1MPa for four times, and the curing time is 6d, so that the lightweight waterproof concrete block is obtained, and the shape of the lightweight waterproof concrete block is a cuboid.
The composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 65 ℃, stirring for 1h, then adding silica fume, nano alumina with the average particle size of 20nm, titanium dioxide with the average particle size of 300nm, polypropylene fiber, volcanic ash and polycarboxylate superplasticizer, wherein the mass ratio of the silica fume to the nano alumina is 10:1, the polypropylene fiber is a mixture of long fibers and short fibers, the mass ratio of the long fibers to the short fibers is 1:6, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
Example 2
The light waterproof concrete block for river channel has material composition as shown in Table 1 and Table 2.
(1) Stirring and uniformly mixing water, cement, broken stone, ceramsite, slag powder, fly ash and a composite waterproof additive to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out primary curing on the primary finished product with the mold under the conditions of 40 ℃ of temperature, 80% of relative humidity and 0.1MPa of pressure for 5 hours to obtain a semi-finished product;
(3) and demolding and cutting the semi-finished product, then gradually raising the temperature, wherein the temperature raising rate is 10 ℃/min, the second curing is carried out under the conditions that the temperature is 70 ℃, the relative humidity is 90% and the pressure is 0.1MPa, the curing time is 1h, then gradually raising the temperature and raising the pressure, the temperature raising rate is 5 ℃/min, the pressure raising rate is 0.2MPa/min, the third curing is carried out under the conditions that the temperature is 170 ℃, the relative humidity is 90% and the pressure is 0.8MPa, the curing time is 10h, then gradually lowering the temperature and lowering the pressure, the temperature lowering rate is 5 ℃/min, the pressure lowering rate is 0.2MPa/min, the fourth curing is carried out under the conditions that the temperature is 40 ℃, the relative humidity is 60% and the pressure is 0.1MPa, and the curing time is 5d, so that the lightweight waterproof concrete block is obtained, and the shape of the lightweight waterproof concrete block is a cylinder.
The composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 65 ℃, stirring for 2 hours, adding silica fume, nano alumina with the average particle size of 50nm, titanium dioxide with the average particle size of 250nm, polypropylene fiber, volcanic ash and polycarboxylate superplasticizer, wherein the mass ratio of the silica fume to the nano alumina is 10:1, the polypropylene fiber is a mixture of long fibers and short fibers, the mass ratio of the long fibers to the short fibers is 1:6, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
Example 3
The light waterproof concrete block for river channel has material composition as shown in Table 1 and Table 2.
(1) Stirring and uniformly mixing water, cement, broken stone, ceramsite, slag powder, fly ash and a composite waterproof additive to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out primary curing on the primary finished product with the mold under the conditions of the temperature of 38 ℃, the relative humidity of 75% and the pressure of 0.1MPa for 5.5 hours to obtain a semi-finished product;
(3) and demolding and cutting the semi-finished product, then gradually raising the temperature, maintaining for 1.5h at a temperature raising rate of 10 ℃/min under the conditions of 65 ℃ and relative humidity of 88% and pressure of 0.1MPa for a second time, then gradually raising the temperature and raising the pressure, wherein the temperature raising rate is 5 ℃/min and the pressure raising rate is 0.2MPa/min, maintaining for a third time under the conditions of 165 ℃ and relative humidity of 88% and pressure of 0.8MPa for 18h, then gradually lowering the temperature and the pressure, wherein the temperature lowering rate is 5 ℃/min and the pressure lowering rate is 0.2MPa/min, maintaining for a fourth time under the conditions of 38 ℃ and relative humidity of 55% and pressure of 0.1MPa, and maintaining for 5.5d to obtain the lightweight waterproof concrete block, wherein the shape of the lightweight waterproof concrete block is cylindrical.
The composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 70 ℃, stirring for 1.5 hours, then adding silica fume, nano alumina with the average particle size of 40nm, titanium dioxide with the average particle size of 200nm, polypropylene fiber, volcanic ash and polycarboxylate superplasticizer, wherein the mass ratio of the silica fume to the nano alumina is 10:1, the polypropylene fiber is a mixture of long fibers and short fibers, the mass ratio of the long fibers to the short fibers is 1:6, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
Example 4
The light waterproof concrete block for river channel has material composition as shown in Table 1 and Table 2.
(1) Stirring and uniformly mixing water, cement, broken stone, ceramsite, slag powder, fly ash and a composite waterproof additive to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out first curing on the primary finished product with the mold under the conditions of 40 ℃ of temperature, 70% of relative humidity and 0.1MPa of pressure for 6 hours to obtain a semi-finished product;
(3) and demolding and cutting the semi-finished product, then gradually raising the temperature, wherein the temperature raising rate is 10 ℃/min, the second curing is carried out under the conditions that the temperature is 70 ℃, the relative humidity is 85% and the pressure is 0.1MPa, the curing time is 2h, then gradually raising the temperature and raising the pressure, the temperature raising rate is 5 ℃/min, the pressure raising rate is 0.2MPa/min, the third curing is carried out under the conditions that the temperature is 170 ℃, the relative humidity is 85% and the pressure is 0.8MPa, the curing time is 20h, then gradually lowering the temperature and lowering the pressure, the temperature lowering rate is 5 ℃/min, the pressure lowering rate is 0.2MPa/min, the fourth curing is carried out under the conditions that the temperature is 40 ℃, the relative humidity is 50% and the pressure is 0.1MPa, and the curing time is 6d, so that the lightweight waterproof concrete block is obtained, and the shape of the lightweight waterproof concrete block is a regular hexagonal prism block.
The composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 75 ℃, stirring for 1h, then adding silica fume, nano alumina with the average particle size of 45nm, titanium dioxide with the average particle size of 100nm, polypropylene fiber, volcanic ash and polycarboxylate superplasticizer, wherein the mass ratio of the silica fume to the nano alumina is 10:1, the polypropylene fiber is a mixture of long fibers and short fibers, the mass ratio of the long fibers to the short fibers is 1:6, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
Example 5
The light waterproof concrete block for river channel has material composition as shown in Table 1 and Table 2.
(1) Stirring and uniformly mixing water, cement, broken stone, ceramsite, slag powder, fly ash and a composite waterproof additive to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out primary curing on the primary finished product with the mold under the conditions of the temperature of 35 ℃, the relative humidity of 80% and the pressure of 0.1MPa for 5 hours to obtain a semi-finished product;
(3) and demolding and cutting the semi-finished product, then gradually raising the temperature, wherein the temperature raising rate is 10 ℃/min, the second curing is carried out under the conditions that the temperature is 60 ℃, the relative humidity is 90% and the pressure is 0.1MPa, the curing time is 1h, then gradually raising the temperature and raising the pressure, the temperature raising rate is 5 ℃/min, the pressure raising rate is 0.2MPa/min, the third curing is carried out under the conditions that the temperature is 165 ℃, the relative humidity is 90% and the pressure is 0.8MPa, the curing time is 15h, then gradually lowering the temperature and lowering the pressure, the temperature lowering rate is 5 ℃/min, the pressure lowering rate is 0.2MPa/min, the fourth curing is carried out under the conditions that the temperature is 35 ℃, the relative humidity is 60% and the pressure is 0.1MPa, and the curing time is 5d, so that the lightweight waterproof concrete block is obtained, and the shape of the lightweight waterproof concrete block is a regular hexagonal prism block.
The composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 70 ℃, stirring for 2 hours, adding silica fume, nano alumina with the average particle size of 30nm, titanium dioxide with the average particle size of 150nm, polypropylene fiber, volcanic ash and polycarboxylate superplasticizer, wherein the mass ratio of the silica fume to the nano alumina is 10:1, the polypropylene fiber is a mixture of long fibers and short fibers, the mass ratio of the long fibers to the short fibers is 1:6, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
Comparative example 1
The comparative example 1 is different from the example 3 in that the composite waterproof admixture is not added to the raw materials for preparing the lightweight waterproof concrete block.
Comparative example 2
The difference between the comparative example 2 and the example 3 is that the water-reducing agent is not added to the raw materials for preparing the composite waterproof admixture.
Comparative example 3
The difference between the comparative example 3 and the example 3 is that sodium methylsiliconate and calcium acrylate are not added in the raw materials for preparing the composite waterproof admixture.
Comparative example 4
The difference between the comparative example 4 and the example 3 is that the raw materials for preparing the composite waterproof admixture are not added with the water reducing agent, the sodium methyl silanol and the calcium acrylate.
Comparative example 5
The difference between the comparative example 5 and the example 3 is that the sodium silicate and the micro silicon powder are not added in the raw materials for preparing the composite waterproof admixture.
Comparative example 6
The difference between the comparative example 6 and the example 3 is that nano alumina and titanium dioxide are not added in the raw materials for preparing the composite waterproof admixture.
Comparative example 7
The difference between the comparative example 7 and the example 3 is that the raw materials for preparing the composite waterproof admixture are not added with sodium silicate, micro silicon powder, nano alumina and titanium dioxide.
Comparative example 8
The comparative example 8 is different from the example 3 in that the mass ratio of the micro silicon powder to the nano alumina in the raw materials for preparing the composite waterproof admixture is 9: 1.
Comparative example 9
The comparative example 9 is different from the example 3 in that the mass ratio of the micro silicon powder to the nano alumina in the raw materials for preparing the composite waterproof admixture is 11: 1.
The following performance tests were carried out on the lightweight waterproof concrete blocks obtained in examples 1 to 5 and comparative examples 1 to 9, and the test results are shown in Table 3.
TABLE 3 test results
Measurement items Compressive Strength ratio (28 d)/(%) Shrinkage ratio (28 d)/(%) Osmotic pressure resistance (28d)/(MPa)
National standard ≥100 ≤125 ≥0.6
Example 1 140 108 3.45
Example 2 138 116 3.68
Example 3 145 101 3.74
Example 4 130 113 3.64
Example 5 135 105 3.57
Comparative example 1 - - 0.43
Comparative example 2 85 133 1.52
Comparative example 3 125 138 1.21
Comparative example 4 83 142 0.96
Comparative example 5 110 121 2.01
Comparative example 6 120 123 2.13
Comparative example 7 101 128 1.69
Comparative example 8 106 123 1.95
Comparative example 9 104 125 1.84
As can be seen from table 3, the lightweight waterproof concrete block for a river channel of the present invention has a higher compressive strength ratio, a higher permeation resistance pressure, and a lower shrinkage ratio, such that the concrete block has the advantages of good waterproof property, good compactness, and higher strength, and compared with stone materials in the prior art, the lightweight waterproof concrete block has the advantages of light weight and low price, and is suitable for a lead wire gabion in river channel revetment construction.
By comparing example 3 with comparative example 1, it can be seen that the compressive strength ratio is not 85%, the shrinkage ratio is not 133%, the permeation pressure is 0.43MPa, the national standard is not satisfied, and the water resistance of the concrete block is poor when the composite waterproof admixture is not added.
By comparing example 3 with comparative examples 2 to 4, the composite waterproof admixture of comparative example 2 was not added with a water reducing agent; sodium methylsiliconate and calcium acrylate were not added to the composite waterproof admixture of comparative example 3; the composite waterproof admixture of comparative example 4 is not added with water reducing agent, sodium methylsiliconate and calcium acrylate, so that the addition of the water reducing agent reduces the water-cement ratio of the raw materials, increases the bonding strength of cement and aggregate, the sodium methylsiliconate and the calcium acrylate permeate into the concrete block and form a firm hydrophobic surface waterproof layer with the raw materials of the concrete block, so that the concrete block has good water repellency, and the waterproofness and the strength of the concrete block are improved through the synergistic effect among the water reducing agent, the sodium methylsiliconate and the calcium acrylate.
By comparing the example 3 and the comparative examples 5 to 7, the composite waterproof admixture of the comparative example 5 is not added with sodium silicate and micro silicon powder; the composite waterproof admixture of comparative example 5 is not added with nano alumina and titanium dioxide; the composite waterproof additive of the comparative example 7 is not added with sodium silicate, micro silicon powder, nano aluminum oxide and titanium dioxide, so that the sodium silicate, micro silicon powder, nano aluminum oxide and titanium dioxide enter the interior of the concrete block and chemically react with free alkaline substances to form crystals and cross-linked three-dimensional grids, the crystals can effectively block capillary channels and cracks in the concrete block, the compactness of the concrete block is increased, and the waterproofness and the strength of the concrete block are improved through the synergistic effect of the sodium silicate, micro silicon powder, nano aluminum oxide and titanium dioxide.
By comparing the embodiment 3 with the comparative examples 8 to 9, the mass ratio of the micro silicon powder to the nano alumina in the composite waterproof admixture of the comparative example 8 is 9: 1; the mass ratio of the micro silicon powder to the nano aluminum oxide in the composite waterproof additive of the comparative example 8 is 11:1, and the micro silicon powder and the nano aluminum oxide are uniformly dispersed in the raw material of the concrete block and fill capillary channels in the concrete block, so that when the content of the micro silicon powder is too much or too much, namely the nano aluminum oxide is too much or too little, the micro silicon powder and the nano aluminum oxide are agglomerated, the bonding strength of the micro silicon powder, the nano aluminum oxide and the raw material of the concrete block is reduced, and the waterproofness and the strength of the concrete block are reduced, therefore, when the mass ratio of the micro silicon powder to the nano aluminum oxide is 10:1, the composite waterproof additive shows good performance, and the waterproofness and the strength of the concrete block are improved.

Claims (7)

1. The utility model provides a light waterproof concrete block for river course which characterized in that: according to the weight portion, the raw materials comprise 140 portions of water 110-containing materials, 320 portions of cement 250-containing materials, 90-110 portions of broken stone, 1100 portions of ceramsite 900-containing materials, 50-110 portions of slag powder, 40-80 portions of fly ash and 10-50 portions of composite waterproof admixture, wherein the composite waterproof admixture comprises 250 portions of water 190-containing materials, 30-60 portions of water reducing agent, 55-80 portions of sodium methylsiliconate, 0.06-0.1 portion of sodium dodecyl sulfonate, 0.09-0.13 portion of heavy calcium carbonate, 1-3 portions of calcium acrylate, 0.07-0.2 portion of calcium hydroxide, 18-23 portions of sodium silicate, 1-5 portions of micro silicon powder, 0.1-0.5 portion of nano alumina, 0.3-0.6 portion of titanium dioxide, 3-6 portions of volcanic ash and 1-3 portions of polypropylene fiber;
the mass ratio of the micro silicon powder to the nano aluminum oxide is 10: 1;
a method of preparing a lightweight waterproof concrete block for a river, comprising the steps of:
(1) stirring and uniformly mixing all the raw materials to obtain a mixture;
(2) pouring the mixture into a mold, and performing compression molding to obtain a primary finished product;
(3) carrying out first maintenance on the primary finished product with the mold to obtain a semi-finished product;
(3) demoulding and cutting the semi-finished product, and then sequentially carrying out secondary curing, tertiary curing and fourth curing to obtain the lightweight waterproof concrete block;
the temperature of the first curing is 35-40 ℃, the relative humidity is 70-80%, the pressure is 0.1MPa, the curing time is 5-6h, the temperature of the second curing is 60-70 ℃, the relative humidity is 85-90%, the pressure is 0.1MPa, the curing time is 1-2h, the temperature of the third curing is 160-170 ℃, the relative humidity is 85-90%, the pressure is 0.8MPa, the curing time is 10-24h, the temperature of the fourth curing is 35-40 ℃, the relative humidity is 50-60%, the pressure is 0.1MPa, and the curing time is 5-6 d.
2. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the waterproof mortar comprises the following raw materials of 135 parts of 120-plus materials, 295 parts of 263-plus materials of cement, 95-105 parts of broken stone, 1060 parts of ceramsite 980-plus materials, 68-100 parts of slag powder, 51-67 parts of fly ash and 24-40 parts of composite waterproof admixture, wherein the composite waterproof admixture comprises 235 parts of 205-plus materials of water, 38-55 parts of water reducing agent, 60-75 parts of sodium methyl silanol, 0.07-0.09 part of sodium dodecyl sulfonate, 0.1-0.12 part of heavy calcium carbonate, 1.5-2.5 parts of calcium acrylate, 0.11-0.18 part of calcium hydroxide, 19-21 parts of sodium silicate, 2.5-4.1 parts of micro silicon powder, 0.25-0.41 part of nano aluminum oxide, 0.4-0.5 part of titanium dioxide, 3.5-5 parts of volcanic ash and 1.5-2.2 parts of polypropylene fiber.
3. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the polypropylene fiber is a mixture of long fibers and short fibers, and the mass ratio of the long fibers to the short fibers is 1: 6.
4. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the average grain diameter of the nano alumina is 20-50nm, and the average grain diameter of the titanium dioxide is 100-300 nm.
5. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
6. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the light waterproof concrete block is in one of a cuboid, a cylinder and a regular hexagonal prism.
7. The lightweight waterproof concrete block for river channels according to claim 1, wherein: the composite waterproof additive is prepared by the following method: uniformly mixing water, sodium methyl silanol, sodium silicate, calcium acrylate, calcium hydroxide, ground limestone and sodium dodecyl sulfate, heating to 65-75 ℃, stirring for 1-2h, then adding micro silicon powder, nano alumina, titanium dioxide, polypropylene fiber, volcanic ash and a water reducing agent, continuously stirring, uniformly mixing, and cooling to room temperature to obtain the composite waterproof additive.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001021552A1 (en) * 1999-09-24 2001-03-29 Thomas Beckenhauer Water resistant building materials
CN101200894A (en) * 2007-12-14 2008-06-18 天津市水利科学研究所 Ecological slope protection vegetation building blocks as well as making method and construction process
CN102898114A (en) * 2012-10-26 2013-01-30 北京立高防水工程有限公司 Plant root puncture resistance environment-friendly self-healing waterproof adhesive and preparation method of adhesive
CN107698213A (en) * 2017-09-20 2018-02-16 广州大学 Restoring vegetation concrete component and its preparation method and application

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001021552A1 (en) * 1999-09-24 2001-03-29 Thomas Beckenhauer Water resistant building materials
CN101200894A (en) * 2007-12-14 2008-06-18 天津市水利科学研究所 Ecological slope protection vegetation building blocks as well as making method and construction process
CN102898114A (en) * 2012-10-26 2013-01-30 北京立高防水工程有限公司 Plant root puncture resistance environment-friendly self-healing waterproof adhesive and preparation method of adhesive
CN107698213A (en) * 2017-09-20 2018-02-16 广州大学 Restoring vegetation concrete component and its preparation method and application

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