CN117447142A - Low-bleeding-rate concrete based on low-stone-powder-content machine-made sand and preparation method thereof - Google Patents
Low-bleeding-rate concrete based on low-stone-powder-content machine-made sand and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 239000004576 sand Substances 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 117
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 41
- 230000000740 bleeding effect Effects 0.000 claims abstract description 37
- 239000004575 stone Substances 0.000 claims abstract description 37
- 239000004568 cement Substances 0.000 claims abstract description 36
- 239000000654 additive Substances 0.000 claims abstract description 34
- 230000000996 additive effect Effects 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 22
- 239000011707 mineral Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims description 36
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 239000011449 brick Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 11
- 239000001341 hydroxy propyl starch Substances 0.000 claims description 10
- 235000013828 hydroxypropyl starch Nutrition 0.000 claims description 10
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000013530 defoamer Substances 0.000 claims description 7
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 4
- 238000005516 engineering process Methods 0.000 abstract description 14
- 238000005204 segregation Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 239000011882 ultra-fine particle Substances 0.000 abstract description 3
- 230000008929 regeneration Effects 0.000 description 21
- 238000011069 regeneration method Methods 0.000 description 21
- 206010016807 Fluid retention Diseases 0.000 description 10
- 239000002002 slurry Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000000227 grinding Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011376 self-consolidating concrete Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to low bleeding rate concrete based on low stone powder content machine-made sand and a preparation method thereof, wherein raw materials of the low bleeding rate concrete per cubic meter comprise the following components: 200-240 kg of cement, 60-80 kg of fly ash, 80-100 kg of mineral powder, 10-30 kg of auxiliary powder material, 750-850 kg of machine-made sand, 980-1050 kg of coarse aggregate, 5-7 kg of additive and 155-170 kg of mixing water. The invention creatively adopts the synergistic effect of series technologies, and effectively solves the problems of poor water retention and easy segregation and bleeding of concrete prepared from the machine-made sand with the defects of less ultrafine particles, high large particle content, poor grading and the like.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to low bleeding rate concrete based on machine-made sand with low stone powder content and a preparation method thereof.
Background
The machine-made sand production process is mainly divided into wet sand production and dry sand production, but with the gradual increase of the control force of the national environmental protection requirements, the machine-made sand produced by the wet method is used in the existing ready-mixed concrete plant. Wet sand making means that water is adopted to wash in the material screening and crushing process in the sand making production line, so that powder with the grain diameter of machine-made sand being smaller than 0.075mm, even fine particles with the grain diameter being larger than 0.15mm are removed, the grading of the machine-made sand is further destroyed, the fineness modulus is larger and reaches more than 3.2, even exceeds 3.5, the prepared concrete has the problems of segregation and bleeding after 30 minutes, even 1.5 hours, and the water retention is poor, and the process quality of the concrete is seriously influenced.
Based on this, numerous researchers have conducted a great deal of experimental work. In the aspect of mixing proportion control, the sand rate of the prepared concrete is properly improved, and although the workability of the concrete can be improved to a certain extent, the water retention of the concrete mixture fluctuates due to the change of the sand quality, so that the concrete engineering quality is affected; the thickening agent is added, and is an aqueous slurry consistency regulator, so that the plastic viscosity and yield stress of the slurry can be changed, the anti-dispersion property of each component of the material is improved, and the stability of the concrete mixture is improved. However, the use effect of the thickener is not easy to control, the anti-segregation effect cannot be achieved due to the small mixing amount, and the concrete mixture is easy to lose fluidity rapidly due to the large mixing amount. At present, the problem of segregation bleeding and poor water retention of machine-made sand concrete with low stone powder content is not fundamentally solved.
The Chinese patent CN201610227948.X discloses a C30 self-compacting concrete capable of being pumped by ultra-high pressure of 620 meters and a preparation method thereof, wherein the concrete comprises the following raw material components in percentage by mass: 6.5 to 7.5 percent of cement, 3.5 to 4.0 percent of fly ash, 1.1 to 2.1 percent of mineral powder, 3.5 to 5.0 percent of viscosity modifier, 76 percent of aggregate, 0.5 to 0.6 percent of polycarboxylic acid additive and 6.8 to 6.9 percent of mixing water; the aggregate consists of sand and stones, and the sand rate ranges from 42% to 48%; the sand is composed of medium sand and fine sand, the stone is composed of large stone and small stone, the fineness modulus of the medium sand is 2.3-2.5, and the fineness modulus of the fine sand is 1.6-1.8; the grain size of the marble is 10-20 mm, and the small Dan Lijing is 5-10 mm. The patent adopts a viscosity regulator obtained by mixing ceramic polishing micro powder, zeolite powder and limestone powder to improve the viscosity and water retention of the ultrahigh pumping C30 self-compacting concrete. However, the patent only uses the difference of different specific surface areas among powder materials to fill the powder materials into concrete so as to improve the working performance of the concrete, but can not solve the problems of segregation and bleeding of the concrete and poor water retention caused by poor sand grading.
Disclosure of Invention
The invention aims to provide low bleeding rate concrete based on low stone powder content machine-made sand and a preparation method thereof, and the invention adopts the synergistic effect of a concrete mixture free water content control technology and an additive compounding technology to effectively solve the problems of poor water retention and easy segregation bleeding of the concrete prepared from the defect machine-made sand with less superfine particles, high large particle content, poor grading and the like.
The aim of the invention can be achieved by the following technical scheme:
the low bleeding rate concrete based on the low stone powder content machine-made sand comprises the following raw materials per cubic meter:
200-240 kg of cement and the weight of the cement,
60-80 kg of fly ash,
80-100 kg of mineral powder,
10-30 kg of auxiliary powder material,
750-850 kg of machine-made sand,
980-1050 kg of coarse aggregate,
5-7 kg of additive,
155-170 kg of mixing water;
wherein the stone powder content in the machine-made sand is less than 1.5 percent.
Further, the cement is 42.5-grade portland cement.
Further, the fly ash is class II fly ash.
Further, the mineral powder is S95 mineral powder.
Further, the auxiliary powder material is a mixture of waste concrete regenerated powder, waste brick regenerated powder and waste cement paste regenerated powder, and the specific surface area of the auxiliary powder material is 500-800 m 2 /kg。
The waste concrete regeneration powder is obtained by grinding waste powder obtained by crushing waste concrete, the waste brick regeneration powder is obtained by crushing and grinding waste bricks, and the waste cement slurry regeneration powder is obtained by precipitating, drying and grinding waste mortar in a sedimentation tank of a mixing station.
The mass percentage of the waste concrete regeneration powder, the waste brick regeneration powder and the waste cement slurry regeneration powder is (40-60): 30-40): 10-20.
By adopting the above-mentioned 'concrete mixture free water content control technology' scheme, on one hand, auxiliary powder materials can be filled among cementing material particles, so that friction resistance is reduced, and workability of machine-made sand concrete is improved; on the other hand, the regenerated powder in the auxiliary powder material has special functions, namely, the porous structure of the regenerated powder, the large specific surface area and free water generated by the mechanical grinding produced microcracks can be consumed by the low-stone-powder-content machine-made sand concrete mixture, so that the water retention property and the system viscosity of the concrete are improved, the stability of the machine-made sand concrete mixture is further improved, and the hydration process can be regulated by the unhydrated cement active ingredients in the regenerated powder and crystal nucleus generated by hydration of the cement, so that the effect of controlling the free water content of the concrete mixture is achieved. Thereby reducing the bleeding rate of the machine-made sand concrete with low stone powder content.
Further, the fineness modulus of the machine-made sand is more than 3.2, and MB is less than 1.0.
Further, the coarse aggregate raw material is crushed stone, the content of needle-shaped particles is not more than 8.0%, and the continuous grading is 5-25 mm.
By adopting the preferable scheme of the sand and stone aggregate, the grading of the aggregate can be controlled, the closest packing of a concrete aggregate system is realized by utilizing the closest packing principle of the aggregate, and the workability and strength of the machine-made sand concrete with low stone powder content are improved.
Further, the additive is a composite additive, and consists of the following components in 100 parts by weight: 20 to 30 parts of water reducer, 2.0 to 4.0 parts of viscosity modifier, 0.5 to 1.0 parts of defoamer and the balance of water.
The water reducer is a polycarboxylic acid high-performance water reducer, the water reducing rate is not lower than 25%, the solid content is 40%, and the air content of the concrete is 2.5-4.0%.
The viscosity regulator is hydroxypropyl starch ether with viscosity of 5000-5000 Pa.s.
The above further, the antifoaming agent is a silicone oil type antifoaming agent.
By adopting the above-mentioned "additive compounding technology" scheme, on one hand the additive can effectively improve concrete flowability, on the other hand the additive has the air entraining component, and it introduces a large amount of bubbles of different sizes in the interior of concrete. Meanwhile, the amount of harmful bubbles can be reduced by adding a proper amount of defoamer, and the stability of tiny and independent bubbles in the system can be ensured by adding hydroxypropyl starch ether. Firstly, a large number of tiny and independent bubbles are like balls, so that friction resistance is reduced, concrete fluidity can be improved, meanwhile, buoyancy generated by the bubbles can improve water retention of concrete, and further stability of a machine-made sand concrete mixture with low stone powder content is improved; and secondly, the added hydroxypropyl starch ether is a viscosity regulator, so that the viscosity of the cement slurry can be regulated, the stability of the low stone powder content machine-made sand concrete mixture is further ensured, and the bleeding rate of the low stone powder content machine-made sand concrete is reduced.
Further, the mixing water is tap water.
In addition, the invention also provides a preparation method of the low bleeding rate concrete based on the low stone powder content machine-made sand, which comprises the following steps:
sequentially feeding auxiliary powder materials, machine-made sand and coarse aggregate, stirring the materials to be uniform for the first time, adding cement, fly ash and mineral powder, stirring the materials to be uniform for the second time, adding an additive and mixing water, and stirring the materials for the third time to prepare the concrete with low bleeding rate.
Further, the first stirring time is 20-30 s, the second stirring time is 10-20 s, and the third stirring time is 60-90 s.
By adopting the technical scheme of the concrete stirring process design, the auxiliary powder material, the machine-made sand and the coarse aggregate are firstly fed in sequence and dry-mixed for 20-30 s, so that the uniformity of the auxiliary powder material is improved, and the function of the technical scheme of the concrete mixture free water content control is better exerted; meanwhile, cement, fly ash and mineral powder are added and stirred for 10-20 s until uniformity, then an additive and mixing water are added and stirred for 60-90 s, so that the uniformity of each component of the prepared concrete and the workability of the concrete are improved, and the bleeding rate of the machine-made sand concrete with low stone powder content is further reduced.
Compared with the prior art, the beneficial effects of the invention are as follows:
through the synergistic effect of the free water content control technology of the concrete mixture, the additive compounding technology and the concrete stirring process design technology, the problems of poor water retention and easy segregation and bleeding of concrete prepared from the machine-made sand with the defects of less ultrafine particles, high large particle content, poor grading and the like are effectively solved.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The raw materials in the following examples are shown below:
(1) And (3) cement: p.o42.5 cement;
(2) Fly ash: class II fly ash;
(3) Mineral powder: s95, mineral powder;
(4) Auxiliary powder material: recycled powder of waste concrete, recycled powder of waste brick and produced by Shanghai Xuan recycling Limited companyWaste cement paste regenerated powder prepared by laboratory of Shanghai Seiko Limited company in West China and used for grinding conventionally, wherein the specific surface area of mixture is 550m 2 /kg；
(5) Machine-made sand: the fineness modulus is 3.3, MB is 0.8, and the stone powder content is 1.2%;
(6) Coarse aggregate: continuous graded broken stone with the grain diameter of 5-25 mm and the content of needle-shaped grains of 7.6 percent;
(7) Additive: the water reducer adopts a polycarboxylic acid high-performance water reducer produced by new material technology limited company of the Western construction of the middle building, the water reducing rate is 29.0%, and the air content of the concrete is 3.5%; the hydroxypropyl starch ether is a viscosity modifier with a viscosity of 7000mpa.s produced by Shanghai performed refiner company, inc.; the defoaming agent is silicone oil defoaming agent produced by new material technology limited company of construction in the western of Chinese construction;
(8) Mixing water: tap water.
The equipment used in the following examples is representative of conventional equipment in the art unless otherwise specified; unless otherwise indicated, all reagents used are commercially available or prepared by methods conventional in the art, and all of the following examples, not specifically described, are accomplished by means of conventional experimentation in the art.
Some embodiments of the invention are described in detail below. The embodiments described below and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides low bleeding rate concrete based on low stone powder content machine-made sand, which comprises the following raw materials per cubic meter of concrete: 200kg of P.O 42.5 cement, 60kg of class II fly ash, 80kg of S95 mineral powder, 10kg of auxiliary powder material, 850kg of machine-made sand, 980kg of coarse aggregate, 5.0kg of additive and 155kg of mixing water. The auxiliary powder material consists of 4kg of waste concrete regeneration powder, 4kg of waste brick regeneration powder and 2kg of waste cement slurry regeneration powder, and the additive consists of 20 parts by weight of polycarboxylic acid high-performance water reducer, 2.0 parts by weight of hydroxypropyl starch ether, 0.5 part by weight of defoamer and 77.5 parts by weight of water.
The preparation method comprises the steps of sequentially pouring the weighed auxiliary powder material, the machine-made sand and the coarse aggregate into a stirrer, stirring for 25s to be uniform, adding the weighed cement, the weighed fly ash and the weighed mineral powder, stirring for 15s to be uniform, adding the additive and the stirred water, and stirring for 80s to prepare the concrete with low bleeding rate.
Example 2
The embodiment provides low bleeding rate concrete based on low stone powder content machine-made sand, which comprises the following raw materials per cubic meter of concrete: 200kg of P.O 42.5 cement, 80kg of class II fly ash, 100kg of S95 mineral powder, 20kg of auxiliary powder material, 820kg of machine-made sand, 1010kg of coarse aggregate, 5.9kg of additive and 160kg of mixing water. The auxiliary powder material consists of 9kg of waste concrete regeneration powder, 7kg of waste brick regeneration powder and 4kg of waste cement slurry regeneration powder, and the additive consists of 30 parts by weight of polycarboxylic acid high-performance water reducer, 4.0 parts by weight of hydroxypropyl starch ether, 1.0 part by weight of defoamer and 65 parts by weight of water.
The preparation method is the same as in example 1.
Example 3
The embodiment provides low bleeding rate concrete based on low stone powder content machine-made sand, which comprises the following raw materials per cubic meter of concrete: 240kg of P.O 42.5 cement, 60kg of class II fly ash, 80kg of S95 mineral powder, 30kg of auxiliary powder material, 750kg of machine-made sand, 1050kg of coarse aggregate, 6.5kg of additive and 165kg of mixing water. The auxiliary powder material consists of 15kg of waste concrete regeneration powder, 11kg of waste brick regeneration powder and 4kg of waste cement slurry regeneration powder, and the additive consists of 25 parts by weight of polycarboxylic acid high-performance water reducer, 3.0 parts by weight of hydroxypropyl starch ether, 0.7 part by weight of defoamer and 71.3 parts by weight of water.
The preparation method is the same as in example 1.
Example 4
The embodiment provides low bleeding rate concrete based on low stone powder content machine-made sand, which comprises the following raw materials per cubic meter of concrete: 240kg of P.O 42.5 cement, 80kg of class II fly ash, 100kg of S95 mineral powder, 15kg of auxiliary powder material, 770kg of machine-made sand, 1020kg of coarse aggregate, 7.0kg of additive and 170kg of mixing water. The auxiliary powder material consists of 7kg of waste concrete regeneration powder, 6kg of waste brick regeneration powder and 2kg of waste cement slurry regeneration powder, and the additive consists of 30 parts by weight of polycarboxylic acid high-performance water reducer, 2.0 parts by weight of hydroxypropyl starch ether, 0.5 part by weight of defoamer and 67.5 parts by weight of water.
The preparation method is the same as in example 1.
Comparative example 1
The comparative example provides a concrete prepared by adopting a conventional additive, and the raw materials of the concrete per cubic meter comprise the following components: 200kg of P.O 42.5 cement, 60kg of class II fly ash, 80kg of S95 mineral powder, 10kg of auxiliary powder material, 850kg of machine-made sand, 980kg of coarse aggregate, 5.0kg of conventional additive and 155kg of mixing water. The auxiliary powder material consists of 4kg of waste concrete regeneration powder, 4kg of waste brick regeneration powder and 2kg of waste cement slurry regeneration powder, and the conventional additive is a polycarboxylic acid high-performance water reducer.
The preparation method is the same as in example 1.
Comparative example 2
The comparative example provides a concrete prepared without adding auxiliary powder materials, which comprises the following components in terms of raw materials per cubic meter of concrete: 200kg of P.O 42.5 cement, 60kg of class II fly ash, 80kg of S95 mineral powder, 850kg of machine-made sand, 980kg of coarse aggregate, 5.0kg of additive and 155kg of mixing water. Wherein the additive consists of 20 parts by weight of a polycarboxylic acid high-performance water reducer, 2.0 parts by weight of hydroxypropyl starch ether, 0.5 part by weight of an antifoaming agent and 77.5 parts by weight of water.
The preparation method is the same as in example 1.
Comparative example 3
The comparative example provides a concrete which is not added with auxiliary powder materials and is prepared by adopting conventional additives, and the raw materials of the concrete per cubic meter comprise the following components: 200kg of P.O 42.5 cement, 60kg of class II fly ash, 80kg of S95 mineral powder, 850kg of machine-made sand, 980kg of coarse aggregate, 5.0kg of conventional additive and 155kg of mixing water. Wherein the conventional additive is a polycarboxylic acid high-performance water reducer.
The preparation method comprises the steps of sequentially pouring the weighed cement, the fly ash, the mineral powder, the machine-made sand, the coarse aggregate, the additive and the mixing water into a mixer, and uniformly stirring to obtain the concrete.
Performance detection
The concrete workability is detected according to the relevant regulations of the standard of the common concrete mixture performance test method (GB/T50080-2016); compressive strength detection is carried out according to the relevant regulations of the method standard for testing physical and mechanical properties of concrete (GB/T50081-2019); the electric flux detection was carried out in accordance with the relevant regulations of the test method Standard for Long-term Performance and durability of ordinary concrete (GB/T50082-2009).
The concrete obtained in examples 1 to 4 and comparative examples 1 to 3 were subjected to slump, bleeding rate, compressive strength and electric flux test, and the test results are shown in Table 1.
TABLE 1 slump, bleeding Rate, compressive Strength and electric flux test results of concrete
The test results show that compared with comparative examples 1-3, the prepared machine-made sand concrete has initial slump not less than 220mm, good concrete cohesiveness, bleeding rate not more than 1.0% and even 0% and far lower than that of a comparative group, and the synergistic effect of the technology such as a concrete mixture free water content control technology, an additive compounding technology and a concrete mixing process design technology is adopted, so that the problems of poor water retention and easy segregation bleeding of concrete prepared from the machine-made sand with defects such as less ultrafine particles, high large particle content and poor grading can be effectively solved.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. A low bleeding rate concrete based on low stone powder content machine-made sand, which is characterized in that the raw materials of the low bleeding rate concrete per cubic meter comprise the following components:
200-240 kg of cement and the weight of the cement,
60-80 kg of fly ash,
80-100 kg of mineral powder,
10-30 kg of auxiliary powder material,
750-850 kg of machine-made sand,
980-1050 kg of coarse aggregate,
5-7 kg of additive,
155-170 kg of mixing water;
wherein the stone powder content in the machine-made sand is less than 1.5 percent.
2. A low bleeding rate concrete based on low stone dust content machine-made sand according to claim 1, characterized in that the cement is a 42.5 grade portland cement; the fly ash is class II fly ash; the mineral powder is S95 mineral powder.
3. The low bleeding rate concrete based on the low stone powder content machine-made sand according to claim 1, wherein the auxiliary powder material is a mixture of waste concrete reclaimed powder, waste brick reclaimed powder and waste cement paste reclaimed powder, and the specific surface area of the auxiliary powder material is 500-800 m 2 /kg。
4. The low bleeding rate concrete based on the machine-made sand with low stone powder content according to claim 3, wherein the mass percentage of the waste concrete reclaimed powder, the waste brick reclaimed powder and the waste cement paste reclaimed powder is (40-60): 30-40): 10-20.
5. A low bleeding rate concrete based on low stone dust content machine-made sand according to claim 1, characterized in that the machine-made sand fineness modulus is > 3.2, mb < 1.0.
6. The low bleeding rate concrete based on low stone powder content machine-made sand according to claim 1, wherein the coarse aggregate needle raw material is broken stone, and the flaky particle content is not more than 8.0%, and the continuous grading is 5-25 mm.
7. A low bleeding rate concrete based on low stone dust content machine-made sand according to claim 1, characterized in that the admixture is a composite admixture, consisting of, by weight 100 parts: 20 to 30 parts of water reducer, 2.0 to 4.0 parts of viscosity modifier, 0.5 to 1.0 parts of defoamer and the balance of water.
8. The low bleeding rate concrete based on the low stone powder content machine-made sand, which is characterized in that the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the water reducing rate is not lower than 25%, the solid content is 40%, and the air content of the concrete is 2.5-4.0%; the viscosity modifier is hydroxypropyl starch ether, and the viscosity is 5000-8000Pa.s; the defoaming agent is silicone oil defoaming agent.
9. A method for preparing low bleeding rate concrete based on low stone dust content machine-made sand as claimed in any one of claims 1-8, characterized by the specific steps of:
sequentially feeding auxiliary powder materials, machine-made sand and coarse aggregate, stirring the materials to be uniform for the first time, adding cement, fly ash and mineral powder, stirring the materials to be uniform for the second time, adding an additive and mixing water, and stirring the materials for the third time to prepare the concrete with low bleeding rate.
10. The method for preparing low bleeding rate concrete based on machine-made sand with low stone powder content according to claim 9, wherein the first stirring time is 20-30 s, the second stirring time is 10-20 s, and the third stirring time is 60-90 s.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008247728A (en) * | 2007-03-06 | 2008-10-16 | Tokyo Electric Power Co Inc:The | Method for producing water-retentive block |
| CN108840712A (en) * | 2018-07-27 | 2018-11-20 | 同济大学 | One kind having the sponge concrete of " contain water-be retained-release water " function |
| CN111348873A (en) * | 2020-02-18 | 2020-06-30 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand pumping concrete |
| CN112456908A (en) * | 2020-12-03 | 2021-03-09 | 中建西部建设贵州有限公司 | Machine-made sand fair-faced concrete using limestone powder and preparation method thereof |
| CN116354685A (en) * | 2023-02-27 | 2023-06-30 | 中铁第四勘察设计院集团有限公司 | Controllable low-strength material utilizing waste light concrete and preparation method thereof |
-
2023
- 2023-11-17 CN CN202311537603.0A patent/CN117447142A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008247728A (en) * | 2007-03-06 | 2008-10-16 | Tokyo Electric Power Co Inc:The | Method for producing water-retentive block |
| CN108840712A (en) * | 2018-07-27 | 2018-11-20 | 同济大学 | One kind having the sponge concrete of " contain water-be retained-release water " function |
| CN111348873A (en) * | 2020-02-18 | 2020-06-30 | 中建西部建设湖南有限公司 | Extra-coarse machine-made sand pumping concrete |
| CN112456908A (en) * | 2020-12-03 | 2021-03-09 | 中建西部建设贵州有限公司 | Machine-made sand fair-faced concrete using limestone powder and preparation method thereof |
| CN116354685A (en) * | 2023-02-27 | 2023-06-30 | 中铁第四勘察设计院集团有限公司 | Controllable low-strength material utilizing waste light concrete and preparation method thereof |
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