CN116199449A - Retarding water reducer for high-performance concrete and application method thereof - Google Patents
Retarding water reducer for high-performance concrete and application method thereof Download PDFInfo
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- CN116199449A CN116199449A CN202310293919.3A CN202310293919A CN116199449A CN 116199449 A CN116199449 A CN 116199449A CN 202310293919 A CN202310293919 A CN 202310293919A CN 116199449 A CN116199449 A CN 116199449A
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- Prior art keywords
- water reducer
- straw
- performance concrete
- retarding
- concrete
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Classifications
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a retarding water reducer for high-performance concrete and a use method thereof, wherein the retarding water reducer comprises the following components: polycarboxylic acid water reducer, straw alkali solution, sodium gluconate, sodium tripolyphosphate, lignosulfonate and camphora superplasticizer; the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.5-0.7% of the mass of the concrete; the doping amount of the straw alkali solution and sodium gluconate, sodium tripolyphosphate and camphora superplasticizer is 2-2.5% of the mass of the concrete; the synergistic effect of the components is exerted by optimizing the mass ratio of the straw alkali-soluble substance to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer, so that the water reducing and retarding effects of the water reducer are further enhanced, and meanwhile, the fluidity of the concrete can be maintained.
Description
Technical Field
The invention relates to the field of preparation of water reducers, in particular to a retarding water reducer for high-performance concrete and a use method thereof.
Background
Along with the continuous development of the urban process, the building industry is also rapidly developed, and has high requirements on the setting time of concrete for some important engineering projects such as stations and the like, so that the concrete setting time is realized by the high-performance retarding water reducer. The high-performance water reducer is taken as an important component of concrete, and can improve the workability, the volume stability and the durability of the concrete; the concrete retarding admixture can effectively inhibit the slump reduction of the water reducer, so that the pouring quality of commercial concrete is ensured, the synergistic effect between the coagulant and the water reducer can simultaneously achieve the effects of reducing water and retarding the concrete, but the current retarding water reducer has the defects of higher cost and unsatisfactory retarding time.
Disclosure of Invention
The invention provides a retarding water reducer for high-performance concrete and a use method thereof, in order to further reduce the cost of the retarding water reducer and improve the coagulation effect of concrete. The specific scheme is as follows:
the retarding water reducer for the high-performance concrete comprises the following components:
polycarboxylic acid water reducer, straw alkali solution, sodium gluconate, sodium tripolyphosphate, lignosulfonate and camphora superplasticizer;
the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.5-0.7% of the mass of the concrete;
the doping amount of the straw alkali solution and sodium gluconate, sodium tripolyphosphate and camphora superplasticizer is 2-2.5% of the mass of the concrete;
the mass ratio of the straw alkali-soluble matter to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer is 3:1.5: (0.056-0.28): (0.128-0.356):
(0.5～0.85)。
further, the preparation method of the straw alkali solution comprises the following steps:
s1: crushing and sieving the straw;
s2: soaking the straw fragments by using an alkaline solution;
s3: diluting the alkaline solution in the S2 to 5-10% after soaking, heating to 95 ℃ and cooling to room temperature;
s4: adding an organic solvent, uniformly mixing, adding an alkaline solution again, and stirring at normal temperature for more than 1h;
s5: distilling at low temperature to obtain the product.
Further, the alkaline solution is any one or a mixture of two of sodium hydroxide and calcium hydroxide.
Further, the concentration of the alkaline solution in S2 is 95-98%.
Further, the S2 soaking time is more than 20 hours.
Further, the organic solvent in S4 is ethanol, and the concentration of the ethanol is 70-85%.
Further, the straw is derived from any one of wheat, rice, corn and trees.
The application method of the retarding water reducer for the high-performance concrete comprises the following steps of: raw materials are prepared according to the components and the respective mass percentages of the retarding water reducer, are stirred, and are added into concrete according to the doping amount.
The beneficial effects are that:
(1) The invention provides a retarding water reducer for high-performance concrete, which can promote the retarding effect of the concrete on the one hand and reduce the use of other high-cost retarders on the other hand by alkalizing crop straws and adding the retarding water reducer into the concrete, thereby saving the cost and recycling crop straw waste.
(2) The synergistic effect of the components is exerted by optimizing the mass ratio of the straw alkali-soluble substance to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer, so that the water reducing and retarding effects of the water reducer are further enhanced, and meanwhile, the fluidity of the concrete can be maintained.
Detailed Description
The present invention will be further described in detail with reference to examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example 1:
a preparation method of a retarding water reducer for high-performance concrete comprises the following steps:
(1) Preparation of straw alkali-soluble matter
S1: crushing and sieving straw, wherein the straw is selected from wheat;
s2: soaking the straw fragments for 22 hours by using a NaOH solution with the concentration of 95%;
s3: diluting NaOH solution to 5% concentration after soaking, heating to 95 deg.C, and cooling to room temperature;
s4: adding 75% ethanol, mixing, adding alkaline solution again, stirring at normal temperature for 2 hr;
s5: distilling at low temperature to obtain the product.
(2) Preparing raw materials: a polycarboxylic acid water reducer, the straw alkali-soluble substance prepared in the step (1), sodium gluconate, sodium tripolyphosphate, lignosulfonate and a camphora superplasticizer;
the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.5 percent of the mass of the concrete;
the doping amount of the straw alkali solution, sodium gluconate, sodium tripolyphosphate and camphora superplasticizer is 2% of the mass of the concrete;
the mass ratio of the straw alkali-soluble matter to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer is 3:1.5:0.056:0.128:0.5.
the raw materials are mixed and stirred, and the raw materials are added into concrete according to 1KG of the concrete raw material.
Example 2:
a preparation method of a retarding water reducer for high-performance concrete comprises the following steps:
(1) Preparation of straw alkali-soluble matter
S1: crushing and sieving straw, wherein the straw is selected from wheat;
s2: soaking the straw fragments for 25h by using a NaOH solution with the concentration of 96%;
s3: diluting NaOH solution to the concentration of 8% after soaking, heating to 95 ℃, and cooling to room temperature;
s4: adding 70% ethanol, mixing, adding alkaline solution again, stirring at normal temperature for 3 hr;
s5: distilling at low temperature to obtain the product.
(2) Preparing raw materials: a polycarboxylic acid water reducer, the straw alkali-soluble substance prepared in the step (1), sodium gluconate, sodium tripolyphosphate, lignosulfonate and a camphora superplasticizer;
the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.7% of the mass of the concrete;
the doping amount of the straw alkali solution and sodium gluconate, sodium tripolyphosphate and the camphora superplasticizer is 2.5% of the mass of the concrete;
the mass ratio of the straw alkali-soluble matter to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer is 3:1.5:0.12:0.25:0.7.
the raw materials are mixed and stirred, and the raw materials are added into concrete according to 1KG of the concrete raw material.
Example 3:
a preparation method of a retarding water reducer for high-performance concrete comprises the following steps:
(1) Preparation of straw alkali-soluble matter
S1: crushing and sieving straw selected from corn;
s2: soaking the straw fragments by using calcium hydroxide with the concentration of 80%;
s3: diluting the calcium hydroxide solution to a concentration of 5-10% after soaking, heating to 95 ℃, and cooling to room temperature;
s4: adding 85% ethanol, mixing, adding calcium hydroxide again, stirring at normal temperature for 2 hr;
s5: distilling at low temperature to obtain the product.
(2) Preparing raw materials: a polycarboxylic acid water reducer, the straw alkali-soluble substance prepared in the step (1), sodium gluconate, sodium tripolyphosphate, lignosulfonate and a camphora superplasticizer;
the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.6% of the mass of the concrete;
the doping amount of the straw alkali solution and sodium gluconate, sodium tripolyphosphate and the camphora superplasticizer is 2.3% of the mass of the concrete;
the mass ratio of the straw alkali-soluble matter to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer is 3:1.5:0.2:0.3:0.7.
the raw materials are mixed and stirred, and the raw materials are added into concrete according to 1KG of the concrete raw material.
The concretes of examples 1 to 3 were subjected to performance tests, including setting time tests and cement paste fluidity tests;
the setting time test is carried out by referring to GB/T1346-2011 'water consumption, setting time and stability test method for cement standard consistency', and is expressed by the time required for a test needle to sink into clean cement standard consistency to a certain depth;
cement paste fluidity test, refer to GB/T8077-2012 method for testing homogeneity of concrete Admixture
The results are shown in the following table:
from the above table, it is known that fluidity and setting time of concrete are improved by synergistic effect of water reducing agent and retarder.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The retarding water reducer for the high-performance concrete is characterized by comprising the following components:
polycarboxylic acid water reducer, straw alkali solution, sodium gluconate, sodium tripolyphosphate, lignosulfonate and camphora superplasticizer;
the doping amount of the polycarboxylic acid water reducer and the lignosulfonate is 0.5-0.7% of the mass of the concrete;
the doping amount of the straw alkali solution and sodium gluconate, sodium tripolyphosphate and camphora superplasticizer is 2-2.5% of the mass of the concrete;
the mass ratio of the straw alkali-soluble matter to the sodium gluconate, the sodium tripolyphosphate, the lignosulfonate and the camphora superplasticizer is 3:1.5: (0.056-0.28): (0.128-0.356):
(0.5～0.85)。
2. the retarding water reducer for high-performance concrete according to claim 1, wherein the preparation method of the straw alkali-soluble substance is as follows:
s1: crushing and sieving the straw;
s2: soaking the straw fragments by using an alkaline solution;
s3: diluting the alkaline solution in the S2 to 5-10% after soaking, heating to 95 ℃ and cooling to room temperature;
s4: adding an organic solvent, uniformly mixing, adding an alkaline solution again, and stirring at normal temperature for more than 1h;
s5: distilling at low temperature to obtain the product.
3. The set retarder for high-performance concrete according to claim 2, wherein the alkaline solution is any one or a mixture of two of sodium hydroxide and calcium hydroxide.
4. The retarding water reducer for high-performance concrete according to claim 2, wherein the concentration of the alkaline solution in S2 is 95-98%.
5. A set-retarding water reducer for high performance concrete according to claim 2, wherein the S2 soaking time is > 20h.
6. The retarding water reducer for high-performance concrete according to claim 2, wherein the organic solvent in S4 is ethanol, and the concentration of the ethanol is 70-85%.
7. The set retarding water reducing agent for high-performance concrete according to claim 1, wherein the straw is derived from any one of wheat, rice, corn and tree.
8. The use method of the retarding water reducer for the high-performance concrete according to any one of 1 to 7 is characterized by comprising the following steps: raw materials are prepared according to the components and the respective mass percentages of the retarding water reducer, are stirred, and are added into concrete according to the doping amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310293919.3A CN116199449A (en) | 2023-03-24 | 2023-03-24 | Retarding water reducer for high-performance concrete and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310293919.3A CN116199449A (en) | 2023-03-24 | 2023-03-24 | Retarding water reducer for high-performance concrete and application method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN116199449A true CN116199449A (en) | 2023-06-02 |
Family
ID=86519252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310293919.3A Pending CN116199449A (en) | 2023-03-24 | 2023-03-24 | Retarding water reducer for high-performance concrete and application method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN116199449A (en) |
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2023
- 2023-03-24 CN CN202310293919.3A patent/CN116199449A/en active Pending
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