CN112341095A - High-strength consolidation body cementing material mixing proportion design method - Google Patents
High-strength consolidation body cementing material mixing proportion design method Download PDFInfo
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- CN112341095A CN112341095A CN202011306268.XA CN202011306268A CN112341095A CN 112341095 A CN112341095 A CN 112341095A CN 202011306268 A CN202011306268 A CN 202011306268A CN 112341095 A CN112341095 A CN 112341095A
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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
- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a design method of a mix proportion of a high-strength concretion cementing material, which comprises the following steps: s1, determining the raw material composition of the cementing material; s2, determining the performance of the raw material; s3, drawing up the water-to-gel ratio of the cementing material; s4, calculating the mixing amount of each raw material in one cubic meter of the cementing material according to an assumed apparent density method; s5, trial mixing the high-strength solidification body cementing material; and S6, determining the mixing ratio. The invention has the characteristics of strong operability, low trial difficulty, high success rate and the like.
Description
Technical Field
The invention relates to the technical field of mix proportion design, in particular to a design method of a mix proportion of a high-strength solidification body cementing material.
Background
The high-strength concretion cementing material is prepared from cement, fly ash, coarse aggregate, fine aggregate, water, a water reducing agent and the like on the basis of the traditional cement-based material; the compressive strength is 60Mpa, the slump expansion is not less than 650mm, the T50 time is 5-20s, the difference between the slump expansion and the J ring expansion is not more than 25mm, and the segregation rate is not more than 15%; when in construction and pouring, the stone is required to be tightly combined with the block stone to form a high-strength compact whole; the self-lubricating grease has the characteristics of high strength, vibration resistance, high fluidity, high durability and the like, and has remarkable technical and economic benefits.
The preparation of the high-strength concretion body cementing material needs to calculate to obtain a reference mixing ratio, is influenced by composition materials and construction modes, has more complex strength influence factors and has a great difference from the mixing ratio of the traditional cement-based materials. As can be seen from experience, the mix proportion design should follow the principle of water-cement ratio precedence. The water-cement ratio of the traditional cement-based material is generally calculated by adopting a conventional theoretical formula, and the matching ratio design and adaptation process is complex. If the conventional theoretical calculation is adopted, the optimal mixing proportion of the high-strength solidification body material is difficult to obtain.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a design method for the mixing proportion of a high-strength solidification body cementing material.
The invention provides a design method of a mix proportion of a high-strength concretion cementing material, which comprises the following steps:
s1, determining the raw material composition of the cementing material; the raw materials comprise: coarse aggregate, fine aggregate, cement, fly ash, mineral powder and an additive;
s2, determining the performance of the raw material; the properties of the raw material include:
coarse aggregate: the crushed stone with 5-16mm continuous gradation has the needle sheet content not more than 8 percent, the mud content not more than 0.5 percent, the compressive strength of the rock which is 30 percent higher than the designed strength of the cementing material, the crushing value not more than 10 percent, the stacking porosity not more than 40 percent and no alkali activity;
fine aggregate: the second zone graded medium sand has fineness modulus larger than 2.6, mud content not more than 2%, mud block content not more than 0.5%, mica content not more than 2%, light substances not more than 1% and chloride ion content not more than 0.06%;
s3, drawing up the water-to-gel ratio of the cementing material; the water-glue ratio is 0.26-0.30;
s4, calculating the mixing amount of each raw material in one cubic meter of the cementing material according to an assumed apparent density method; the mixing amount of the raw materials comprises: cement: 400-470kg, fly ash: 8-13% of the total weight of the cementing material, and mineral powder: the weight of the cementing material is 11-18%, and the mineral content is as follows: 40-45%, water consumption: calculated according to the planned water-to-gel ratio, the admixture is: determining according to the drawn water-to-glue ratio and the working performance requirement;
s5, trial mixing the high-strength solidification body cementing material; trial-prepare three kinds of cementing materials with different mixing proportions each time, and discharge 1m3Detecting indexes, manufacturing standard test blocks, detecting the strength of each age, taking the strength after standard maintenance for 28 days as the standard final strength, and selecting the mixing ratio with the lowest cost and good indexes as a reference mixing ratio;
s6, determining the mixing ratio; determining the reference mixing ratio, and stirring again for 2m3Making a solid test block, performing destructive test, and checking whether the performance of the solid test block reaches an expected target; if deviation exists, timely adjusting; if the requirements are met, the actual consumption of each raw material is determined, and the final mixing proportion is determined.
Preferably, in S2, the coarse aggregate is two graded crushed stones.
Preferably, in S2, the fineness modulus of the fine aggregate is 2.6 to 3.0.
Preferably, in S2, the properties of the raw material further include: cement: portland cement, strength grade 52.5.
Preferably, in S2, the properties of the raw material further include: fly ash: and (4) class II fly ash.
Preferably, in S2, the properties of the raw material further include: mineral powder: and (3) grinding the slag powder by using an S95-grade granulated blast furnace.
Preferably, in S2, the properties of the raw material further include: additive: the admixture should have good compatibility with cement, mineral admixture and the like, and the type and the mixing amount of the admixture should be determined through experiments. Preferably adopts a high-performance water reducing agent, the water reducing rate is more than or equal to 28 percent, and the composition is compounded according to the performance requirement of the cementing material.
Preferably, in S4, when the absolute value of the difference between the measured apparent density value and the assumed value of the gel material does not exceed 2% of the assumed value, the amount of each raw material is not required to be adjusted.
Preferably, in S5, the specific process of the adapting is: cleaning a stirrer and premixing mortar, adding coarse aggregate and fine aggregate, stirring for 10s, adding 50% of water, stirring for 15s, adding cement, fly ash and mineral powder, stirring for 40s, adding 40% of water, adding an additive, stirring for 40s, observing the workability of the mixture to determine whether the remaining 10% of water needs to be added and whether the water reducing agent needs to be continuously added, discharging the mixture if the preliminary performance index is met, and analyzing reasons and adjusting the adaptive mixing proportion if the preliminary performance index is not met.
Compared with the prior art, the invention has the following beneficial effects: the invention takes the water-glue ratio as the core and the working performance as the target, combines the historical construction experience and the corresponding data, plans the mixing amount of each raw material, and has the characteristics of strong operability, low trial assembly difficulty, high success rate and the like.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
Examples
A design method for the mix proportion of a high-strength consolidation body cementing material comprises the following steps:
s1, determining the raw material composition of the cementing material; the raw materials comprise: coarse aggregate, fine aggregate, cement, fly ash, mineral powder and an additive;
s2, determining the performance of the raw material; the properties of the raw material include:
coarse aggregate: two graded broken stones of 5-13mm, by weight ratio, the needle sheet content is 8%, the mud content is 0.5%, the rock compressive strength of the coarse aggregate is 30% higher than the designed strength of the cementing material, the crushing value is 10%, the stacking porosity is 40%, and the crushed stone has no alkali activity;
fine aggregate: the second zone is graded medium sand, the fineness modulus is more than 2.9, and the mud content is 2 percent, the mud block content is 0.5 percent, the mica content is 2 percent, the light substances are 1 percent, and the chloride ion content is 0.06 percent according to the weight ratio;
cement: portland cement, strength grade 52.5;
fly ash: class ii fly ash (class F);
mineral powder: s95 level granulated blast furnace levigating slag powder;
additive: the ZW-A-IX type high efficiency water reducing agent has a water reducing rate of more than or equal to 28 percent;
s3, drawing up the water-to-gel ratio of the cementing material; the water-to-glue ratio is 0.28;
s4, calculating the mixing amount of each raw material in one cubic meter of the cementing material according to an assumed apparent density method; assuming that the apparent density of the cementing material is 2450 +/-50 kg/m3When the absolute value of the difference between the measured apparent density value and the assumed value of the gel material is not more than 2% of the assumed value, the mixing amount of each raw material is not required to be adjusted; the mixing amount of the raw materials is as follows: cement: 400-470kg, fly ash: 8-13% of the total weight of the cementing material, and mineral powder: the weight of the cementing material is 11-18%, and the mineral content is as follows: 40-45%, water consumption: calculated according to the planned water-to-gel ratio, the admixture is: determining according to the drawn water-to-glue ratio and the working performance requirement;
s5, trial mixing the high-strength solidification body cementing material; trial-prepare three kinds of cementing materials with different mixing proportions each time, and discharge 1m3Detecting indexes such as slump expansion, T50 time and the like, manufacturing a 150X 150mm standard test block, detecting the strength of each age, taking the strength after standard maintenance for 28 days as the final strength, and selecting a mixing ratio with the lowest cost and good indexes such as strength, slump expansion, T50 time, workability, cohesiveness and the like as a reference mixing ratio; wherein, the concrete process of adaptation is: cleaning a stirrer and premixing mortar, adding coarse aggregate and fine aggregate, stirring for 10s, adding 50% of water, stirring for 15s, adding cement, fly ash and mineral powder, stirring for 40s, adding 40% of water, adding an additive, stirring for 40s, observing the workability of the mixture to determine whether the remaining 10% of water needs to be added and whether the water reducing agent needs to be continuously added, and if the workability of the mixture meets the requirement of the initial time, adding the coarse aggregate and the fine aggregate, stirring for 10s, adding 50% of water, stirring for 15Step two, discharging materials if the performance indexes do not meet the primary performance indexes, analyzing reasons and adjusting the adaptive mixing ratio;
s6, determining the mixing ratio; determining the reference mixing ratio, and stirring again for 2m3Making a 1.5 multiplied by 1.5m entity test block, performing destructive test, and checking whether the performances of water retention, pumpability, workability and the like of the test block reach the expected targets; if deviation exists, timely adjusting; if the requirements are met, the actual consumption of each raw material is determined, and the final mixing proportion is determined.
The compounding ratio and related properties of the high-strength cementitious material finally determined according to the above method are shown in the following table:
for the high-strength concrete gelled material after the above-mentioned determined mixing ratio, attention should be paid to the following steps in specific construction:
1. before the high-strength consolidation body cementing material is constructed, the rock block is washed clean, and the water accumulated by washing is cleaned. Although the high-strength consolidation body cementing material belongs to a large flow state mixture, the high-strength consolidation body cementing material is limited by factors such as the size of the lump stone, the placing mode and the like, and a handheld vibrating rod is required to be equipped to assist the molding of the high-strength consolidation body.
2. After the high-strength concretion material is conveyed to a site, the high-strength concretion material is rotated at a high speed for 60-90s to ensure that the working state is optimal, and the high-strength concretion material is beneficial to molding of the high-strength concretion material. And after the pouring is finished, timely maintaining is carried out, the forming quality of the high-strength concreting body is ensured, and the maintaining time is not less than 14 d.
The invention has the characteristics of strong operability, low trial difficulty, high success rate and the like.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A design method for the mix proportion of a high-strength consolidation body cementing material is characterized by comprising the following steps:
s1, determining the raw material composition of the cementing material; the raw materials comprise: coarse aggregate, fine aggregate, cement, fly ash, mineral powder and an additive;
s2, determining the performance of the raw material; the properties of the raw material include:
coarse aggregate: the crushed stone with 5-16mm continuous gradation has the needle sheet content not more than 8 percent, the mud content not more than 0.5 percent, the compressive strength of the rock which is 30 percent higher than the designed strength of the cementing material, the crushing value not more than 10 percent, the stacking porosity not more than 40 percent and no alkali activity;
fine aggregate: the second zone graded medium sand has fineness modulus larger than 2.6, mud content not more than 2%, mud block content not more than 0.5%, mica content not more than 2%, light substances not more than 1% and chloride ion content not more than 0.06%;
s3, drawing up the water-to-gel ratio of the cementing material; the water-glue ratio is 0.26-0.30;
s4, calculating the mixing amount of each raw material in one cubic meter of the cementing material according to an assumed apparent density method; the mixing amount of the raw materials comprises: cement: 400-470kg, fly ash: 8-13% of the total weight of the cementing material, and mineral powder: the weight of the cementing material is 11-18%, and the mineral content is as follows: 40-45%, water consumption: calculated according to the planned water-to-gel ratio, the admixture is: determining according to the drawn water-to-glue ratio and the working performance requirement;
s5, trial mixing the high-strength solidification body cementing material; trial-distributing three cementing materials with different mixture ratios each time, discharging each material for 1m, detecting indexes, manufacturing a standard test block, detecting the strength of each age, taking the final strength after standard maintenance for 28 days as the standard mixture ratio, and selecting the mixture ratio with the lowest cost and good indexes as the standard mixture ratio;
s6, determining the mixing ratio; after the reference mixing proportion is determined, stirring for 2m for carrying out double-cropping, manufacturing an entity test block, carrying out destructive test, and checking whether the performance of the entity test block reaches an expected target; if deviation exists, timely adjusting; if the requirements are met, the actual consumption of each raw material is determined, and the final mixing proportion is determined.
2. The method for designing the mix ratio of a high-strength cementitious material as claimed in claim 1, wherein in S2, the coarse aggregate is two graded crushed stones.
3. The method for designing the mix proportion of the high-strength cementitious material according to claim 1, wherein in S2, the fineness modulus of the fine aggregate is 2.6 to 3.0.
4. The method for designing the mix ratio of the high-strength cement as claimed in claim 1, wherein in S2, the properties of the raw materials further include: cement: portland cement, strength grade 52.5.
5. The method for designing the mix ratio of the high-strength cement as claimed in claim 1, wherein in S2, the properties of the raw materials further include: fly ash: and (4) class II fly ash.
6. The method for designing the mix ratio of the high-strength cement as claimed in claim 1, wherein in S2, the properties of the raw materials further include: mineral powder: and (3) grinding the slag powder by using an S95-grade granulated blast furnace.
7. The method for designing the mix ratio of the high-strength cement as claimed in claim 1, wherein in S2, the properties of the raw materials further include: additive: the high-performance water reducing agent has a water reducing rate of not less than 28 percent.
8. The method according to claim 1, wherein in step S4, when the absolute value of the difference between the measured apparent density value and the assumed value of the gel material is not more than 2% of the assumed value, the amount of each raw material is not required to be adjusted.
9. The method for designing the mix proportion of the high-strength cement as claimed in claim 1, wherein in S5, the concrete process of the adaptation is as follows: cleaning a stirrer and premixing mortar, adding coarse aggregate and fine aggregate, stirring for 10s, adding 50% of water, stirring for 15s, adding cement, fly ash and mineral powder, stirring for 40s, adding 40% of water, adding an additive, stirring for 40s, observing the workability of the mixture to determine whether the remaining 10% of water needs to be added and whether the water reducing agent needs to be continuously added, discharging the mixture if the preliminary performance index is met, and analyzing reasons and adjusting the adaptive mixing proportion if the preliminary performance index is not met.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737817A (en) * | 2021-09-09 | 2021-12-03 | 中国水利水电第四工程局有限公司 | Construction method of high-strength concrete |
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