CN111847958A - Composite retarding material and preparation method thereof - Google Patents
Composite retarding material and preparation method thereof Download PDFInfo
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- CN111847958A CN111847958A CN202010449648.2A CN202010449648A CN111847958A CN 111847958 A CN111847958 A CN 111847958A CN 202010449648 A CN202010449648 A CN 202010449648A CN 111847958 A CN111847958 A CN 111847958A
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
Abstract
The invention relates to a composite retarding material which comprises the following components in percentage by mass: 20-80% of monosaccharide retarding material; 0-60% of polysaccharide retarding material; 0-52% of inorganic acid retarding material; 0-14% of organic acid retarding material. The composite retarding material is not limited by water-cement ratio and is not influenced by concrete admixture, after the composite retarding material is added into concrete, the initial setting time of the concrete can be controlled to be freely selected from 60h to 90h, the final setting time is controlled to be 70h to 100h, the pseudo-setting phenomenon of the concrete caused by monosaccharide retarder is avoided, the condition that the slump loss of the concrete is too fast caused by polysaccharide retarder is avoided, the problem of short retarding time of inorganic acid retarder is solved, and the later strength increase of the concrete is not influenced. The invention also relates to a preparation method of the composite retarding material, which comprises the following steps: and uniformly mixing monosaccharide retarding materials, polysaccharide retarding materials, inorganic acid retarding materials and organic acid retarding materials according to a solid mass ratio to prepare powder.
Description
Technical Field
The invention relates to a retarding material, in particular to a composite retarding material for concrete and a preparation method thereof.
Background
The slow setting material is one of common additives of concrete, and can delay the hydration rate of cement, adjust the setting time of concrete and improve the construction performance of concrete. At present, the retarding materials on the market are mainly single retarding materials which are mainly divided into four categories of monosaccharide retarding materials, polysaccharide retarding materials, inorganic acid retarding materials and organic acid retarding materials, but when concrete with the retarding time of 60 hours and meeting the use requirement of an underwater cast-in-place pile needs to be prepared, the four categories of single retarding materials have obvious defects.
The monosaccharide retarding material is mainly represented by sodium gluconate, and the sodium gluconate is also the most commonly used retarder at present. Referring to fig. 1, fig. 1 shows the effect of the sodium gluconate content on the initial setting time of concrete. With the increase of the dosage of the sodium gluconate, the initial setting time of the concrete can be prolonged from 10 hours to more than 20 days, and the retarding effect is good. However, when the amount of the sodium gluconate exceeds 0.12% of the gelled material in the concrete, the concrete can generate a pseudo-coagulation phenomenon, the fluidity of the concrete is lost after the concrete is taken out of the machine for 5-10min, and then the concrete is gradually recovered after 30min, and the higher the sodium gluconate is, the faster the fluidity is lost, the longer the required recovery time is, the working performance of the concrete can be seriously influenced, and the construction pouring requirement cannot be met. When the mixing amount of the sodium gluconate is 0.12 percent of the concrete cementing material, the initial setting time of the concrete is 45-50 hours, so that when the mixing amount of the sodium gluconate is less than 0.12 percent, the initial setting time of the concrete cannot be longer than 60 hours, and when the mixing amount exceeds 0.12 percent, the working performance of the concrete cannot meet the requirements of transportation and pouring.
The polysaccharide retarder mainly comprises sucrose, starch, dextrin and the like, wherein the most commonly used sucrose. The cane sugar is disaccharide which is a retarding material with obvious effect, and when the use amount of the cane sugar reaches 0.3 percent of the concrete cementing material, the initial setting time of the concrete can be delayed to more than 10 days. However, when the amount of the sucrose is more than 0.1%, the slump loss of the concrete is accelerated, and the slump loss is irreversible, thereby seriously affecting the performance of the concrete. However, the initial setting time of the concrete is only about 40 hours when the sucrose content is 0.1 percent.
The inorganic acid retarding material mainly comprises phosphates (sodium hexametaphosphate, sodium dihydrogen phosphate, sodium pyrophosphate and the like) in different polymerization states, boric acid and borate; the organic acid retarding material mainly comprises citric acid, tartaric acid and the like. These materials are characterized by a short retardation time, but the retardation effect is evident at an earlier stage. Taking sodium hexametaphosphate as an example, when the doping amount of the sodium hexametaphosphate is 0.08 percent of the cementing material in the concrete, the initial setting time is about 20 hours, and when the doping amount is enlarged to 0.15 percent, 0.3 percent and 0.5 percent of the cementing material in the concrete, the initial setting time is 40 to 48 hours, and the setting time of the concrete is not prolonged along with the increase of the using amount of the sodium hexametaphosphate. The retardation time of such retarding materials is limited.
The engaged row pile is used as a foundation pit enclosure structure and is divided into a hard cutting engaged pile and a soft cutting engaged pile according to the construction process. Wherein the construction mode of soft cutting secant pile is: firstly constructing I-sequence piles (interlocked concrete cast-in-place piles constructed at intervals in advance), then constructing II-sequence piles (concrete cast-in-place piles which are constructed subsequently and interlocked with the adjacent I-sequence piles), cutting off the concrete of the intersection part of the I-sequence piles and the II-sequence piles before the concrete of the I-sequence piles is hardened, and then completing the concrete casting of the II-sequence piles, thereby realizing the interlocking. The key of the construction of the soft cutting secant pile is to cut before concrete of the I-sequence pile is hardened, the cutting is usually completed before the concrete is initially set, the soft cutting of the I-sequence pile is smoothly completed, besides reasonably arranging construction organization, the setting time of the concrete must be prolonged enough to ensure that the II-sequence pile has sufficient construction time, if the concrete is hardened during the cutting, a drill cylinder of the soft cutting cannot complete the cutting, at the moment, the drill cylinder with a cutter edge needs to be replaced to perform hard cutting, the construction cost is greatly increased, and the construction efficiency is greatly reduced. Therefore, whether the hardening time of the concrete of the I-sequence pile can meet the soft cutting requirement or not plays an important role in the whole construction organization.
The design of the foundation pit enclosure of the Shenzhen subway 14 # line large transportation city comprehensive transportation hub project mostly adopts the form of meshed piles + inner supports, wherein the meshed piles of the foundation pit of the large transportation station all adopt the soft cutting construction process, the site conditions have a lot of restrictions on construction, the concrete delayed coagulation time of the I-sequence pile is required to be longer, and the process has the following three points in concrete requirements by combining the actual conditions of the project itself:
1. the initial setting time of the first-order pile concrete is not less than 60 hours;
2. the concrete needs to have good working performance so as to meet the requirement of pouring self-compacting concrete into a pile foundation;
3. the delayed coagulation of concrete cannot affect the later strength of the concrete.
However, in the existing single retarding material, if the monosaccharide retarding material and the polysaccharide retarding material are used for realizing 60 hours of retarding time of the concrete, the working performance of the concrete is damaged, and the inorganic acid retarding material and the organic acid retarding material cannot realize 60 hours of retarding time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a composite retarding material which can ensure that the initial setting time of concrete is long, the working performance is good and the later strength is high.
The composite retarding material comprises the following components in percentage by mass: 20-80% of monosaccharide retarding material; 0-60% of polysaccharide retarding material; 0-52% of inorganic acid retarding material; 0-14% of organic acid retarding material.
Compared with the prior art, the composite retarding material is compounded by monosaccharide, polysaccharide, inorganic acid and organic acid retarding agents, the respective effects of the retarding materials are researched, and different combinations of the retarding materials are combined to make up for deficiencies, so that the composite retarding material is not limited by water-cement ratio and is not influenced by concrete admixture, after the concrete is added, the initial setting time of the concrete can be controlled to be freely selected from 60h to 90h, the final setting time is controlled to be 70h to 100h, the pseudo-setting phenomenon of the concrete caused by the monosaccharide retarding agents is avoided, the condition that the slump retarding loss of the concrete is too fast caused by the polysaccharide retarding agents is avoided, the problem that the inorganic acid retarding agents are short in time is solved, and the later strength increase of the concrete is not influenced. The slow-release water reducing agent has the advantages that the slow-release water reducing agent can play a role in retarding uniformly and continuously, the condition of segregation and bleeding caused by strong slow-release effect at a certain stage can be avoided, and the slow-release water reducing agent is matched for use, so that the mixed concrete has good workability.
Further, the monosaccharide-based retarding material is a combination of one or more of glucose and sodium gluconate. The delayed coagulation time can be prolonged.
Further, the polysaccharide retarding material is sucrose. The delayed coagulation time can be prolonged.
Further, the inorganic acid retarding material is one or a combination of more of sodium hexametaphosphate, sodium dihydrogen phosphate, sodium pyrophosphate, boric acid and borate. Can play a role in retarding early so as to reduce the using amount of the carbohydrate retarder.
Further, the organic acid retarding material is one or a combination of more of tartaric acid, citric acid and salts thereof. Can play a role in retarding at early and middle stages, and the inorganic acid retarder and the carbohydrate retarder are lapped, so that the retarding process is continuously and stably.
Further, the monosaccharide retarding material is sodium gluconate, the polysaccharide retarding material is sucrose, the inorganic acid retarding material is sodium hexametaphosphate, sodium dihydrogen phosphate, sodium pyrophosphate and boric acid, and the organic acid retarding material is tartaric acid and sodium citrate.
Further, the mass percentages of the materials are as follows: 20-80% of sodium gluconate, 0-60% of sucrose, 0-20% of sodium hexametaphosphate, 0-10% of sodium dihydrogen phosphate, 0-10% of sodium pyrophosphate, 0-12% of boric acid, 0-8% of tartaric acid and 0-6% of sodium citrate. Is a composite retarding material proportioning completely suitable for the occlusion type row pile soft cutting process.
Furthermore, the dosage of the concrete cementing material is 0.12 to 0.2 percent of the total mass of the cementing material in the doped concrete. The retardation time can be controlled by controlling the incorporation ratio.
The invention also comprises a preparation method of the composite retarding material, namely, monosaccharide retarding material, polysaccharide retarding material, inorganic acid retarding material and organic acid retarding material are uniformly mixed according to the mass proportion of solids to prepare powder.
Drawings
FIG. 1 shows the effect of sodium gluconate on the initial setting time of concrete.
Detailed Description
Uniformly mixing 20-80% of monosaccharide retarding material, 0-60% of polysaccharide retarding material, 0-52% of inorganic acid retarding material and 0-14% of organic acid retarding material in percentage by mass, and preparing into powder to obtain the composite retarding material. When the composite concrete material is used, the composite concrete material can be added into concrete according to the proportion of 0.12-0.2% of the concrete cementing material, or the composite concrete material can be added into water to prepare a water agent and then added into the concrete, or the water agent and the water reducing agent are added into the concrete.
Example 1
The components and mass percentages of the composite retarding material in the embodiment are shown in table 1, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.15 percent of the total amount of the cementing material, the water-gel ratio is 0.43, and the mixing amount of the fly ash is 30 percent. The results of the performance tests of the concrete prepared by mixing according to the above proportions are shown in Table 2.
TABLE 1 proportion of the materials in the composite set retarding material
| Sodium gluconate | Sucrose | Sodium hexametaphosphate | |
| 60％ | 30％ | 5％ | 5％ |
TABLE 2 test results of concrete mixed with the composite set retarding material of example 1
The concrete in the embodiment 1 has the initial setting time of 72 hours and the final setting time of 91 hours, and can completely meet the time requirement of soft cutting of the occlusive pile, the concrete is not subjected to false setting and rapid slump loss after being mixed out of the machine, the slump is kept stable in the first 2 hours, the slump is slowly lost after 2 hours, and the maintaining time of the workability of the concrete can meet the requirement of construction and pouring. The intensity increase was normal in 7 days, 28 days, and 56 days.
Example 2
The components and mass percentages of the composite retarding material in the embodiment are shown in table 3, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.15 percent of the total amount of the cementing material, the water-gel ratio is 0.38, and the mixing amount of the fly ash is 30 percent. The results of the performance tests of the concrete prepared by mixing according to the above proportions are shown in Table 4.
TABLE 3 proportion of various materials in the composite set retarding material
| Sodium gluconate | Sucrose | Sodium hexametaphosphate | Pyrophosphoric acid sodium salt | Citric acid sodium salt |
| 55％ | 30％ | 6％ | 5％ | 4％ |
TABLE 4 test results of concrete mixed with the composite set retarder of example 2
The concrete in the embodiment 2 has initial setting time of 70 hours and final setting time of 86 hours, and can meet the time requirement of soft cutting of the occlusive pile, the concrete has no pseudo setting and rapid slump loss after being mixed out of the machine, the slump is kept stable in the first 2.5 hours, the slump is slowly lost after 2.5 hours, and the maintaining time of the workability of the concrete can meet the requirement of construction and pouring. The strength after 28 days of age increased normally, indicating that the composite set retarding material did not affect the later strength of the concrete.
Example 3
The components and mass percentages of the composite retarding material in the embodiment are shown in table 5, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.16 percent of the total amount of the cementing material, the water-gel ratio is 0.48, and the mixing amount of the fly ash is 30 percent. The results of the performance tests of the concrete prepared by mixing in the above proportions are shown in Table 6.
TABLE 5 proportions of the materials in the composite set retarding materials
| Sodium gluconate | Sucrose | Sodium hexametaphosphate | Sodium dihydrogen phosphate | Boric acid | Citric acid sodium salt |
| 20％ | 55％ | 10％ | 5％ | 5％ | 5％ |
TABLE 6 test results of concrete mixed with the composite set retarder of example 3
The concrete in the embodiment 3 has the initial setting time of 68 hours and the final setting time of 79 hours, and can meet the time requirement of soft cutting of the occlusive pile, the concrete is not subjected to false setting and rapid slump loss after being mixed out of the machine, the slump is kept stable in the first 3 hours, the concrete is slowly lost after 3 hours, and the maintaining time of the workability of the concrete can meet the construction and pouring requirements. The strength after 28 days of age increased normally, indicating that the composite set retarding material did not affect the later strength of the concrete.
Example 4
The components and mass percentages of the composite retarding material in the embodiment are shown in table 7, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.16 percent of the total amount of the cementing material, the water-gel ratio is 0.43, and the mixing amount of the fly ash is 30 percent. The results of the performance tests of the concrete prepared by mixing in the above proportions are shown in Table 8.
TABLE 7 proportions of the materials in the composite set retarding materials
| Sodium gluconate | Sucrose | Sodium dihydrogen phosphate | Pyrophosphoric acid sodium salt | Boric | Tartaric acid | |
| 50％ | 30％ | 5％ | 5％ | 5％ | 5％ |
TABLE 8 test results of concrete mixed with the composite set retarder of example 4
The concrete in the embodiment 4 has initial setting time of 77 hours and final setting time of 89 hours, and can completely meet the time requirement of soft cutting of the occlusive pile, after the concrete is mixed out of the machine, no pseudo setting and rapid slump loss occur, the slump is kept stable in the first 3 hours, and slowly loses after 3 hours, and the maintaining time of the workability of the concrete can meet the requirement of construction and pouring. The strength after 28 days of age increased normally, indicating that the composite set retarding material did not affect the later strength of the concrete.
Example 5
The components and mass percentages of the composite retarding material in the embodiment are shown in table 9, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.18 percent of the total amount of the cementing material, the water-gel ratio is 0.43, and the mixing amount of the fly ash is 30 percent. The results of the performance tests of the concrete prepared by mixing in the above proportions are shown in Table 10.
TABLE 9 proportion of various materials in the composite set retarding material
| Sodium gluconate | Sucrose | Sodium hexametaphosphate | Pyrophosphoric acid sodium salt | Boric | Tartaric acid | |
| 50％ | 30％ | 5％ | 5％ | 5％ | 5％ |
TABLE 10 test results of concrete mixed with the composite set retarder of example 5
The concrete in the embodiment 5 has the initial setting time of 83 hours and the final setting time of 96 hours, and can completely meet the time requirement of soft cutting of the occlusive pile, the concrete does not have the conditions of false setting and rapid slump loss after being mixed out of the machine, the slump is kept stable in the first 3 hours, the concrete begins to slowly lose after 3 hours, and the maintaining time of the workability of the concrete can meet the requirement of construction and pouring. The strength after 28 days of age increased normally, indicating that the composite set retarding material did not affect the later strength of the concrete.
Example 6
The components and mass percentages of the composite retarding material in the embodiment are shown in table 11, and after the composite retarding material is prepared, concrete is prepared by mixing the following components in percentage by weight: the mixing amount of the composite retarding material is 0.15 percent of the total amount of the cementing material, the water-gel ratio is 0.43, and the mixing amount of the fly ash is 50 percent. The results of the performance tests on the concrete prepared by mixing the above proportions are shown in Table 12
TABLE 11 proportion of various materials in the composite set retarding material
| Sodium gluconate | Sucrose | Boric acid | Pyrophosphoric acid sodium salt | Citric acid sodium salt |
| 70％ | 20％ | 2％ | 4％ | 4％ |
TABLE 12 test results of concrete mixed with the composite set retarder of example 6
The concrete in the embodiment 6 has initial setting time of 85 hours and final setting time of 98 hours, and can completely meet the time requirement of soft cutting of the occlusive pile, the concrete has no pseudo setting and rapid slump loss after being mixed out of the machine, the slump is kept stable in the first 2.5 hours, the slump is slowly lost after 2.5 hours, and the maintaining time of the workability of the concrete can meet the requirement of construction and pouring. The strength after 28 days of age increased normally, indicating that the composite set retarding material did not affect the later strength of the concrete.
The above embodiments are all based on several implementation manners of the technical solution proposed by the present invention, and each example gives a detailed implementation method and implementation effect as reference, and is only a preferred embodiment of the present invention. On the premise of fully knowing concrete knowledge and concrete construction process, the invention recombines different types of retarding materials according to specific proportions by researching the different types of retarding materials to obtain the composite retarding material, solves the problems that the concrete needs to be retarded for a long time, saccharide retarders are coagulated falsely, the workability loss is fast, the setting time of inorganic acid and organic acid retarders is short, and the like, can retard the concrete for a long time without causing the working fluctuation of the concrete, ensures the sufficient retarding time of the concrete, can be smoothly constructed, and ensures the quality.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. The composite retarding material is characterized by comprising the following components in percentage by mass: 20-80% of monosaccharide retarding material; 0-60% of polysaccharide retarding material; 0-52% of inorganic acid retarding material; 0-14% of organic acid retarding material.
2. The composite set retarding material of claim 1, wherein: the monosaccharide retarding material is one or a combination of glucose and sodium gluconate.
3. The composite set retarding material of claim 1, wherein: the polysaccharide retarding material is sucrose.
4. The composite set retarding material of claim 1, wherein: the inorganic acid retarding material is one or the combination of more of sodium hexametaphosphate, sodium dihydrogen phosphate, sodium pyrophosphate, boric acid and borate.
5. The composite set retarding material of claim 1, wherein: the organic acid retarding material is one or a combination of more of tartaric acid, citric acid and salts thereof.
6. The composite set retarding material of claim 1, wherein: the monosaccharide retarding material is sodium gluconate, the polysaccharide retarding material is sucrose, the inorganic acid retarding material is sodium hexametaphosphate, sodium dihydrogen phosphate, sodium pyrophosphate and boric acid, and the organic acid retarding material is tartaric acid and sodium citrate.
7. The composite set retarding material of claim 6, wherein: the mass percentages of the materials are as follows: 20-80% of sodium gluconate, 0-60% of sucrose, 0-20% of sodium hexametaphosphate, 0-10% of sodium dihydrogen phosphate, 0-10% of sodium pyrophosphate, 0-12% of boric acid, 0-8% of tartaric acid and 0-6% of sodium citrate.
8. The composite set retarding material of claim 1, wherein: the dosage of the material is 0.12 to 0.2 percent of the total mass of the cementing material in the doped concrete.
9. A method for preparing a composite set retarding material as claimed in claims 1 to 8, characterized in that: and uniformly mixing monosaccharide retarding materials, polysaccharide retarding materials, inorganic acid retarding materials and organic acid retarding materials according to a solid mass ratio to prepare powder.
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Application publication date: 20201030 |