CN114276086A - Preparation process of light high-strength UHPC spherical material - Google Patents
Preparation process of light high-strength UHPC spherical material Download PDFInfo
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- CN114276086A CN114276086A CN202111682847.9A CN202111682847A CN114276086A CN 114276086 A CN114276086 A CN 114276086A CN 202111682847 A CN202111682847 A CN 202111682847A CN 114276086 A CN114276086 A CN 114276086A
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Abstract
The invention provides a preparation process of a light high-strength UHPC spherical material, and relates to the field of preparation processes of light high-strength UHPC spherical materials. The preparation process of the light high-strength UHPC sphere material comprises the following steps of S1: proportioning, wherein the light high-strength UHPC sphere is prepared by mixing 736g of cement, 212g of silica fume, 160g of steel fiber, 28g of additive, 1050g of quartz sand, 174g of water and 130g of fine filler, weighing by using an electronic balance, and weighing required materials in advance twice, S2: stirring, wherein the light high-strength UHPC sphere adopts a cement mortar stirrer, and is forcibly stirred at variable speed: firstly, dry-mixing cement and other powder materials at medium speed for 2 min. The invention adopts UHPC with higher strength to prepare, thereby ensuring higher bounce, selects a hollow structure aiming at a sphere structure, and has the advantages that the thickness of a shell is required to be controlled within 2.5cm if a hollow structure system is adopted on the premise of ensuring the weight limit of the sphere, and the existing technical basis of the technical center is combined aiming at a forming process.
Description
Technical Field
The invention relates to the field of preparation processes of light high-strength UHPC spherical materials, in particular to a preparation process of a light high-strength UHPC spherical material.
Background
UHPC (ultra high performance concrete) is a fiber reinforced cement-based composite material which has ultra high anti-permeability performance and mechanical property based on a compact packing theory system.
The UHPC balls with the diameter of 200 +/-10 mm and the weight of not more than 6000g are made, the toughness and the impact resistance of the balls are compared through the rebound of the balls falling onto a steel plate freely and the damage degree after impact, the performance of the used UHPC material is inspected through the UHPC balls which are not large or too heavy.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation process of a light high-strength UHPC sphere material, which solves the problem of investigating the performance of the used UHPC material by using UHPC spheres with the diameter of 200 +/-10 mm and the weight of not more than 6000g, comparing the toughness and the impact resistance of the balls by the resilience of the free falling balls on a steel plate and the damage degree after impact, and using the UHPC spheres with small and heavy weight.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a process for preparing a light high-strength UHPC sphere material comprises the following steps,
s1: proportioning, wherein the light high-strength UHPC sphere is prepared by mixing 736g of cement, 212g of silica fume, 160g of steel fiber, 28g of additive, 1050g of quartz sand, 174g of water and 130g of fine filler, weighing by using an electronic balance, and weighing the required materials twice in advance;
s2: stirring, wherein the light high-strength UHPC sphere adopts a cement mortar stirrer, and is forcibly stirred at variable speed: firstly, dry-mixing cement and other powder materials at a medium speed for 2min, then adding 2/3 water and all water reducing agents, stirring until the mixture is in a dough shape, then adding the rest water, stirring quickly for 2min until the cementing materials and the additives are fully dispersed and uniformly mixed, then stirring slowly, simultaneously adding fibers uniformly, and stirring slowly for 2min after all the fibers are added;
s3: forming, namely removing air bubbles from the light high-strength UHPC sphere by using a vibrating table, feeding the light high-strength UHPC sphere into a mold by dividing a lower hemisphere, feeding an upper hemisphere into the mold twice, and performing top cover re-vibration once, wherein a flat steel bar is used for inserting and tamping in the vibrating process;
s4: and (4) curing, namely curing the light high-strength UHPC ball at high temperature, standing for 24 hours, then demolding, and putting the demolded test piece into a steam curing box, and keeping the temperature for 7 days.
Preferably, the cement is selected from conch and Taiwan mud which are commonly used in the comparative production and small amount of imported Jiangnan-Xiaoyetian cement, and the Jiangnan-Xiaoyetian P.II 52.5 grade cement with proper particle fineness and better control on superfine components is selected;
the silica fume is selected from NR95U type of Wuhannirui Qi;
the steel fiber is high-strength copper-plated steel fiber, the steel fiber is length (12 mm-16 mm) fiber and diameter (0.18 mm-0.22 mm) fiber, and the volume fraction of the steel fiber is 2% -4%;
the additive adopts Subot to produce a high-efficiency polycarboxylic acid water reducing agent;
the quartz sand is 0.315-0.16 mm in fine particle size, and the screening test is carried out according to the regulation of TB 10210-2001.
Preferably, the light-weight high-strength UHPC sphere is demoulded after being formed, glycerol is selected as a demoulding separant, an upper half mould is pried firstly, and demoulding is carried out after the upper half mould is pushed to the lower half mould.
Preferably, the preparation of the mould comprises the following steps:
s1: the wall thickness is initially selected, the mold is compared with a ball body after the ball body is selected through a No. 1 ball and a No. 2 ball, when the thickness of the ball wall reaches 3.25cm, cracks can be generated until the ball wall is impacted for the third time, the thick ball wall is proved to have good rigid support, but the biggest problem is overweight, so the weight reduction is needed, and the wall thickness of 2.5cm is the biggest thickness which can be realized under the common volume weight of UHPC;
s2: selecting an internal mold, selecting a scheme of light weight and hollow internal molds for testing from the beginning by designing and manufacturing the elastic ball of the mold, selecting 2.5cm as the thickness of the wall of a UHPC sphere, adopting the stainless steel internal molds through the test balls 3 and 4, adopting the foam internal molds 5 and 6, and generating larger cracks during the first impact by adopting the foam internal molds through the pushing and dropping comparison at the height of 2m, wherein the width of the cracks is much smaller by adopting the stainless steel internal molds;
the analysis shows that: although the UHPC shell can be approximately regarded as a rigid body, the UHPC shell still generates certain deformation when contacting with a steel plate with higher rigidity, and can play a certain buffer effect when the inside of the UHPC shell is rigidly supported;
the thin-wall stainless steel inner mold with the thickness of 0.3mm is determined to be adopted through the first stage test;
s3: the steel fiber mixing amount is increased, the mold increases the cement dosage and increases the volume fraction of the steel fiber to 4 percent in a larger weight-rich condition through the application of UHPC empirical mixing ratio in T/CBMF37/T/CCPA7-2018, so as to increase the rigidity of the sphere and meet the collision requirement.
Preferably, the mold is generally an ABS plastic mold and a silica gel mold selected for obtaining a smooth surface of UHPC, but considering the requirements of one-step molding of a sphere and hollow inner mold, the sphere mold needs to be divided into two parts, in order to ensure less formed bubbles, a vibration table needs to be matched for vibration operation, the plastic mold is split and subjected to strong vibration, the molding difficulty is high, so that the steel mold is selected for molding, the whole mold is divided into an upper semicircle and a lower semicircle, and a small top cover is added.
(III) advantageous effects
The invention provides a preparation process of a light high-strength UHPC sphere material. The method has the following beneficial effects:
1. the shell is prepared by adopting UHPC with higher strength, so that higher bounce is ensured, a hollow structure is selected for a spherical structure, on the premise of ensuring the weight limit of the spherical body, if a hollow structure system is adopted, the thickness of the shell must be controlled within 2.5cm, and the existing technical basis of the technical center is combined for a forming process.
2. The content of SiO2 is controlled to be more than or equal to 95 percent, the specific surface area is more than or equal to 15 square meters per gram, the tensile strength of steel fibers is more than or equal to 2850Mpa, the mud content of quartz sand is not more than 0.5 percent, the content of SiO2 is more than or equal to 95 percent, and the UHPC mixture not only needs to have better fluidity to be convenient for forming, but also needs to have proper rheological property, maintains the stability of material movement under a certain vibration action, and ensures the uniform distribution of each component, especially fibers, in a hardened body.
3. The best pouring process is adopted, and aiming at a sphere forming die, in order to ensure the size precision of a sphere, the best effect can be achieved only by adopting a steel die for one-time forming.
Drawings
FIG. 1 is a schematic diagram of the UHPC mix ratio of the present invention;
FIG. 2 is a schematic diagram of the cement performance index of the present invention;
FIG. 3 is a schematic diagram of the silica fume performance index of the present invention;
FIG. 4 is a schematic structural diagram of the performance index of the steel fiber of the present invention;
FIG. 5 is a schematic diagram of the performance index of the admixture for external and internal use according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the embodiment of the present invention provides a process for preparing a light-weight high-strength UHPC sphere material, including the following steps,
s1: proportioning, namely mixing 736g of cement, 212g of silica fume, 160g of steel fiber, 28g of additive, 1050g of quartz sand, 174g of water and 130g of fine filler to form a light high-strength UHPC sphere, weighing by using an electronic balance, and weighing the required materials in advance twice;
s2: stirring, wherein the light high-strength UHPC sphere adopts a cement mortar stirrer, and the stirring is forced by using variable speed: firstly, dry-mixing cement and other powder materials at a medium speed for 2min, then adding 2/3 water and all water reducing agents, stirring until the mixture is in a dough shape, then adding the rest water, stirring quickly for 2min until the cementing materials and the additives are fully dispersed and uniformly mixed, then stirring slowly, simultaneously adding fibers uniformly, and stirring slowly for 2min after all the fibers are added;
s3: forming, namely removing bubbles from a light high-strength UHPC sphere by using a vibrating table, feeding the light high-strength UHPC sphere into a mold by dividing a lower hemisphere, feeding an upper hemisphere into the mold twice, and performing top cover re-vibration once, wherein a flat steel bar is used for inserting and tamping in the vibrating process;
s4: maintaining, namely, performing high-temperature maintenance on the light-weight high-strength UHPC sphere, standing for 24 hours, then demolding, putting the demolded test piece into a steam curing box, keeping the temperature for 7 days, and preparing by adopting UHPC with higher strength, thereby ensuring higher bounce.
Example two:
as shown in fig. 2, 3, 4 and 5, an embodiment of the present invention provides a process for preparing a lightweight high-strength UHPC spherical material, including a process for preparing a lightweight high-strength UHPC spherical material, wherein cement is selected from a group consisting of conch, tai mud, and a small amount of imported south of the Yangtze river-small open field cement, which are commonly used in comparative production, and a 52.5 grade south of the Yangtze river-small open field cement with a suitable particle fineness and a better control on ultrafine components;
the silica fume is selected from NR95U type of Wuhan New Yoghui;
the steel fiber is high-strength copper-plated steel fiber, the steel fiber is length (12 mm-16 mm) fiber and diameter (0.18 mm-0.22 mm) fiber, and the volume fraction of the steel fiber is 2% -4%;
the additive adopts Subot to produce the high-efficiency polycarboxylic acid water reducing agent;
the quartz sand is made of fine-grain quartz sand of 0.315-0.16 mm, a screening test is carried out according to the specification of TB10210-2001, the content of SiO2 is controlled to be more than or equal to 95%, the specific surface area is more than or equal to 15 square meters per gram, the tensile strength of steel fibers is more than or equal to 2850Mpa, the mud content of the quartz sand is not more than 0.5%, the content of SiO2 is more than or equal to 95%, and a UHPC mixture not only needs to have good fluidity to be convenient for forming, but also needs to have proper rheological property, so that the stability of material movement is maintained under a certain vibration action, and the uniform distribution of each component, particularly fibers, in a hardened body is ensured.
Example three:
the embodiment of the invention provides a preparation process of a light high-strength UHPC sphere material, which comprises the preparation process of the light high-strength UHPC sphere material, wherein the light high-strength UHPC sphere is demoulded after being formed, glycerol is selected as a demoulding separant, an upper half mould is pried firstly, and then demoulding is carried out by jacking a lower half mould;
the preparation of the mould comprises the following steps:
s1: the wall thickness is initially selected, the mold is compared with a subsequent ball body through No. 1 and No. 2 balls, when the thickness of the ball wall reaches 3.25cm, cracks are generated until the ball wall is impacted for the third time, the thick ball wall is proved to have good rigid support, but the biggest problem is overweight, so the weight reduction is needed, and the wall thickness of 2.5cm is the biggest thickness which can be realized under the common volume weight of UHPC;
s2: selecting an internal mold, selecting a scheme of light weight and hollow internal molds for testing from the beginning by designing and manufacturing elastic balls of the mold, selecting 2.5cm as the thickness of the wall of a UHPC sphere, adopting a stainless steel internal mold through test balls 3 and 4, adopting a foam internal mold through test balls 5 and 6, and generating a large crack when the foam internal mold is impacted for the first time through the pushing and dropping comparison at the height of 2m, wherein the crack width of the stainless steel internal mold is much smaller;
the analysis shows that: although the UHPC shell can be approximately regarded as a rigid body, the UHPC shell still generates certain deformation when contacting with a steel plate with higher rigidity, and can play a certain buffer effect when the inside of the UHPC shell is rigidly supported;
through a first stage test, determining to adopt a thin-wall stainless steel inner die with the thickness of 0.3 mm;
s3: the steel fiber mixing amount is increased, the cement amount is increased in the condition of larger abundant weight by the mold through the application of UHPC (ultra high performance) empirical mixing ratio in T/CBMF37/T/CCPA7-2018, and the volume fraction of the steel fiber is increased to 4 percent to increase the rigidity of the sphere to meet the collision requirement;
the mould is generally selected from an ABS plastic mould and a silica gel mould for obtaining a smooth surface of UHPC, but considering the requirements of one-time forming of a sphere and hollow inner mould, the sphere mould is required to be divided into two parts, in order to ensure less formed bubbles, a vibration table is required to be matched for vibration operation, the plastic mould is divided into two parts and needs to undergo strong vibration, the forming difficulty is higher, so that the steel mould is selected for forming finally, the whole mould is divided into an upper semicircle and a lower semicircle, a small top cover is added, the pouring process is optimal, and the best effect can be achieved only by adopting the steel mould for one-time forming aiming at the sphere forming mould and ensuring the size precision of the sphere.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A preparation process of a light high-strength UHPC sphere material is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1: proportioning, wherein the light high-strength UHPC sphere is prepared by mixing 736g of cement, 212g of silica fume, 160g of steel fiber, 28g of additive, 1050g of quartz sand, 174g of water and 130g of fine filler, weighing by using an electronic balance, and weighing the required materials twice in advance;
s2: stirring, wherein the light high-strength UHPC sphere adopts a cement mortar stirrer, and is forcibly stirred at variable speed: firstly, dry-mixing cement and other powder materials at a medium speed for 2min, then adding 2/3 water and all water reducing agents, stirring until the mixture is in a dough shape, then adding the rest water, stirring quickly for 2min until the cementing materials and the additives are fully dispersed and uniformly mixed, then stirring slowly, simultaneously adding fibers uniformly, and stirring slowly for 2min after all the fibers are added;
s3: forming, namely removing air bubbles from the light high-strength UHPC sphere by using a vibrating table, feeding the light high-strength UHPC sphere into a mold by dividing a lower hemisphere, feeding an upper hemisphere into the mold twice, and performing top cover re-vibration once, wherein a flat steel bar is used for inserting and tamping in the vibrating process;
s4: and (4) curing, namely curing the light high-strength UHPC ball at high temperature, standing for 24 hours, then demolding, and putting the demolded test piece into a steam curing box, and keeping the temperature for 7 days.
2. The preparation process of the light high-strength UHPC sphere material according to claim 1, characterized in that: the cement is selected by selecting 52.5 grade cement of the south China-small open field P.II with proper particle fineness and better control on superfine components after comparing the conch and the Taiwan mud which are commonly used in production and a small amount of imported south China-small open field cement;
the silica fume is selected from NR95U type of Wuhannirui Qi;
the steel fiber is high-strength copper-plated steel fiber, the steel fiber is length (12 mm-16 mm) fiber and diameter (0.18 mm-0.22 mm) fiber, and the volume fraction of the steel fiber is 2% -4%;
the additive adopts Subot to produce a high-efficiency polycarboxylic acid water reducing agent;
the quartz sand is 0.315-0.16 mm in fine particle size, and the screening test is carried out according to the regulation of TB 10210-2001.
3. The preparation process of the light high-strength UHPC sphere material according to claim 1, characterized in that: and (3) demoulding the molded light high-strength UHPC sphere, selecting glycerol as a demoulding separant, prying an upper half mould firstly, and then ejecting a lower half mould for demoulding.
4. The preparation process of the light high-strength UHPC sphere material according to claim 1, characterized in that: the preparation of the mould comprises the following steps:
s1: the wall thickness is initially selected, the mold is compared with a ball body after the ball body is selected through a No. 1 ball and a No. 2 ball, when the thickness of the ball wall reaches 3.25cm, cracks can be generated until the ball wall is impacted for the third time, the thick ball wall is proved to have good rigid support, but the biggest problem is overweight, so the weight reduction is needed, and the wall thickness of 2.5cm is the biggest thickness which can be realized under the common volume weight of UHPC;
s2: selecting an internal mold, selecting a scheme of light weight and hollow internal molds for testing from the beginning by designing and manufacturing the elastic ball of the mold, selecting 2.5cm as the thickness of the wall of a UHPC sphere, adopting the stainless steel internal molds through the test balls 3 and 4, adopting the foam internal molds 5 and 6, and generating larger cracks during the first impact by adopting the foam internal molds through the pushing and dropping comparison at the height of 2m, wherein the width of the cracks is much smaller by adopting the stainless steel internal molds;
the analysis shows that: although the UHPC shell can be approximately regarded as a rigid body, the UHPC shell still generates certain deformation when contacting with a steel plate with higher rigidity, and can play a certain buffer effect when the inside of the UHPC shell is rigidly supported;
the thin-wall stainless steel inner mold with the thickness of 0.3mm is determined to be adopted through the first stage test;
s3: the steel fiber mixing amount is increased, the mold increases the cement dosage and increases the volume fraction of the steel fiber to 4 percent in a larger weight-rich condition through the application of UHPC empirical mixing ratio in T/CBMF37/T/CCPA7-2018, so as to increase the rigidity of the sphere and meet the collision requirement.
5. The preparation process of the light high-strength UHPC sphere material according to claim 1, characterized in that: the ABS plastic mould and the silica gel mould are generally selected as the mould for obtaining the smooth surface of the UHPC, but the requirement of one-step forming of the sphere and hollow inner mould is considered, the sphere mould needs to be divided into two parts, the vibration operation needs to be carried out by matching with a vibration table in order to ensure less formed bubbles, the plastic mould is divided into two parts and needs to undergo strong vibration, the forming difficulty is higher, and therefore the steel mould is selected for forming finally, the whole mould is divided into an upper semicircle and a lower semicircle, and a small top cover is added.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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| CH47074A (en) * | 1909-03-15 | 1910-05-16 | Tottoli & Mueller | Process for the production of hollow spherical containers from concrete |
| CN111533513A (en) * | 2020-05-08 | 2020-08-14 | 广东德泽建设工程有限公司 | Ultrahigh-performance concrete, electric pole and preparation method thereof |
| CN112456902A (en) * | 2020-11-27 | 2021-03-09 | 苏州三佳交通工程有限公司 | Ultrahigh-performance concrete and preparation method thereof |
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2021
- 2021-12-30 CN CN202111682847.9A patent/CN114276086A/en active Pending
Patent Citations (3)
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|---|---|---|---|---|
| CH47074A (en) * | 1909-03-15 | 1910-05-16 | Tottoli & Mueller | Process for the production of hollow spherical containers from concrete |
| CN111533513A (en) * | 2020-05-08 | 2020-08-14 | 广东德泽建设工程有限公司 | Ultrahigh-performance concrete, electric pole and preparation method thereof |
| CN112456902A (en) * | 2020-11-27 | 2021-03-09 | 苏州三佳交通工程有限公司 | Ultrahigh-performance concrete and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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