CN113429134A - Method for adjusting fluidity and setting time of chemically-activated cementing material system - Google Patents
Method for adjusting fluidity and setting time of chemically-activated cementing material system Download PDFInfo
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- CN113429134A CN113429134A CN202110826134.9A CN202110826134A CN113429134A CN 113429134 A CN113429134 A CN 113429134A CN 202110826134 A CN202110826134 A CN 202110826134A CN 113429134 A CN113429134 A CN 113429134A
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for adjusting the fluidity and the setting time of a chemically-activated cementing material system. Wherein the inorganic salt composed of negative hydrated ions comprises KCl, KBr and KNO3And Ba (NO)3)2. KCl, KBr or KNO3The content of the precursor is 3 to 5 percent of the mass of the precursor material of the chemically excited cementing material, and the Ba (NO) accounts for3)2The content of the precursor is 0.1-0.2% of the mass of the precursor material of the chemically excited cementing material. The invention can improve the initial fluidity and fluidity retentivity of the chemically excited cementitious material slurry and prolong the setting time. Initial flow of the slurry compared to a chemically activated cementitious material without inorganic salt incorporationThe degree is improved by 5.9-20.6%, the higher fluidity is maintained in both 30min and 60min, the initial setting time is prolonged by 171-307%, the final setting time is prolonged by 124-232%, and the influence on the mechanical property of the chemically excited cementing material is small.
Description
Technical Field
The invention belongs to the field of civil engineering materials, and particularly relates to a method for adjusting the fluidity and the setting time of a chemically-activated cementing material system.
Background
Civil engineering construction has the greatest impact on the natural environment of human beings, and occupies the greatest proportion of resources and energy. The chemically excited cementing material is an ecological building material and has excellent physical and mechanical properties. The environment compatibility from raw materials, production process to use process is good. However, the hydration, coagulation and hardening speed of the chemical excitation cementing material excited by the water glass is high, and the chemical excitation cementing material loses fluidity quickly, so that the engineering application of the chemical excitation cementing material is not facilitated. The water reducing agent applied to the silicate cement system for increasing the fluidity comprises lignosulfonate, a naphthalene high-efficiency water reducing agent, a melamine high-efficiency water reducing agent, a polycarboxylate high-efficiency water reducing agent and the like. When the water reducing agent is applied to a chemically excited cementing material, the high alkalinity of the hydration environment of the cementing material can destroy the stability of the molecular structure of the water reducing agent and influence the effect of the water reducing agent. And competitive adsorption between the alkali component and the high-efficiency water reducing agent can also influence the adsorption efficiency and the dispersion effect of the high-efficiency water reducing agent in a chemically excited cementing material system. It can be seen that the application of organic surfactants to chemically activated cementitious systems to adjust their flowability is a significant challenge. The inventor applies phosphate, borate, malic acid, sodium chloride and the like to a chemical excitation cementing material system, and finds that the chemical excitation cementing material system can play a certain role in delaying hydration, but the mixing amount is large, the fluidity retentivity of slurry or mixture is poor, and the mechanical strength is greatly lost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for adjusting the fluidity and the setting time of a chemically-activated cementitious material system.
The technical scheme adopted by the invention is as follows:
a method for adjusting the fluidity and the setting time of a chemically activated cementitious material system comprises the following steps:
in the using process of the chemically excited cementing material, inorganic salt composed of negative hydrated ions is compounded and doped, and the inorganic salt composed of the negative hydrated ions adopts inorganic salt composed of ions with different hydration properties and different chemical radiuses.
Preferably, the inorganic salt composed of negative hydrated ions has an ionic radius of not less than 1.11X 10-8m, the ions are negative hydrated ions.
Preferably, the inorganic salt of the negative hydrated ion comprises KCl, KBr and KNO3And Ba (NO)3)2。
Preferably, KCl, KBr or KNO3The content of the precursor is 3 to 5 percent of the mass of the precursor material of the chemically excited cementing material, and the Ba (NO) accounts for3)2The content of the precursor is 0.1-0.2% of the mass of the precursor material of the chemically excited cementing material.
Preferably, in the chemically activated cementing material, the precursor material adopts granulated blast furnace slag powder, and the alkali component adopts water glass solution.
Preferably, in the chemically excited cementitious material, the content of the granulated blast furnace slag powder is 65-70% by mass, and the content of the water glass solution is 30-35% by mass.
Preferably, the 7d activity index of the granulated blast furnace slag powder is not less than 75 percent, the 28d activity index is not less than 95 percent, and the specific surface area is 400-470 m2A basicity index of not less than 1.0.
Preferably, the modulus of the water glass solution is 1.2-1.5, and the solute mass concentration is 25.0%.
Preferably, the chemically activated cementitious material is used by a process comprising:
uniformly mixing a precursor material of the chemically excited cementitious material and inorganic salt consisting of negative hydrated ions, then adding an alkali component and uniformly stirring to obtain alkali slag cement paste;
and adding sand into the alkali slag cement paste and uniformly mixing to obtain the alkali slag cement mortar.
Preferably, after adding the alkali component, stirring at the rotating speed of 140 +/-5 r/min for 120s, standing for 15s, and stirring at the rotating speed of 285 +/-5 r/min for 120s to obtain alkali slag cement slurry;
when sand is added into the alkali slag cement slurry, river sand with the maximum grain diameter of 4.75mm is added according to the glue-sand ratio of 1: 3.
The invention has the following beneficial effects:
according to the invention, after the inorganic salt composed of negative hydrated ions is doped into the chemically excited cementing material system, the zeta potential, the plastic viscosity and the yield stress of the system are influenced by the negative hydratability of the ions, which is specifically represented by increasing the absolute value of the zeta potential, decreasing the plastic viscosity and decreasing the yield stress, so that after the inorganic salt composed of negative hydrated ions is doped into the chemically excited cementing material, the fluidity and the setting time of the prepared slurry can be adjusted in a larger range to meet the construction requirements.
Further, the inorganic salt composed of negative hydrated ions includes KCl, KBr and KNO3And Ba (NO)3)2Therefore, the inorganic salt composed of the negative hydrated ions is a common chemical substance, is easy to obtain, does not influence the preparation process of chemically excited cementitious material slurry, mortar or concrete, and has small influence on mechanical properties.
Further, KCl, KBr or KNO3The content of the precursor is 3 to 5 percent of the mass of the precursor material of the chemically excited cementing material, and the Ba (NO) accounts for3)2The content of the compound is 0.1-0.2% of the mass of the precursor material of the chemically excited cementing material, so that the inorganic salt formed by the negative hydrated ions has small mixing amount and low cost.
Detailed Description
The present invention will be described in detail with reference to examples.
The invention mainly provides a method for adjusting the fluidity and the setting time of a chemically-excited cementing material system, and solves the problems of high fluidity loss and difficult engineering application of the chemically-excited cementing material system.
Specifically, the technical scheme adopted by the invention is that inorganic salts composed of ions with different hydration performances and different chemical radiuses are doped, and the fluidity and the setting time of a chemically excited cementing material system are adjusted.
The invention is also characterized in that: the ionic radius of the inorganic salt is not less than 1.11X 10-8m is negative hydrated ion. The inorganic salt adopts KCl, KBr and KNO3And Ba (NO)3)2. KCl, KBr and KNO with the concentration of 3-5 percent3One of them is respectively doped with 0.1% -0.2% of Ba (NO)3)2The mass percentages of the components are the mass percentages of the precursor material of the chemically excited cementing material. The chemically excited cementing material comprises 65-70% of precursor material and 30-35% of alkali component solution, and the sum of the mass percentages of the two components is 100%. The precursor material adopts granulated blast furnace slag powder, and the specific surface area is 400-470 m2The activity index of 7d is more than 75 percent, the activity index of 28d is more than 95 percent, and the alkalinity coefficient is not less than 1.0; the alkali component is water glass solution, the modulus is 1.2-1.5, and the mass concentration is 25.0%.
Example 1
Weighing the following raw materials by mass: 65% of granulated blast furnace slag powder and 35% of water glass solution, wherein the weight is 600g and 318g respectively. KNO3And Ba (NO)3)23 percent and 0.15 percent of the granulated blast furnace slag powder respectively, namely 18g and 0.9g respectively, the powder materials are sequentially added into a pure slurry stirrer to be uniformly mixed, and then the water glass solution is added. The stirrer is used for stirring for 120s at the rotating speed of 140r/min, standing for 15s and then stirring for 120s at the rotating speed of 285r/min to obtain the alkali slag cement paste.
River sand with the maximum grain size of 4.75mm is added according to the glue-sand ratio of 1: 3 on the basis of the proportion of the alkali slag cement slurry materials, namely, the raw materials are 600g of granulated blast furnace slag powder, 318g of water glass solution and KNO318g、Ba(NO3)20.9g and 1800g of sand, and evenly stirring to prepare the alkali slag cement mortar.
Example 2
Weighing the following raw materials by mass: 70% of granulated blast furnace slag powder and 30% of water glass solution, wherein the weight is 600g and 262g respectively. KNO3And Ba (NO)3)2Respectively accounting for 4 percent and 0.1 percent of the granulated blast furnace slag powder,namely, 24g and 0.6g, respectively, were uniformly stirred according to the stirring system of example 1 to obtain alkali slag cement slurry.
On the basis of the proportion of the alkali slag cement slurry material, 1800g of river sand with the maximum grain size of 4.75mm is added according to the glue-sand ratio of 1: 3, and the alkali slag cement slurry is prepared by uniformly stirring.
Example 3
Weighing the following raw materials by mass: 67.5 percent of granulated blast furnace slag powder and 32.5 percent of water glass solution, which are respectively 600g and 289 g. KCl and Ba (NO)3)25% and 0.2% of the granulated blast furnace slag powder, i.e. 30g and 1.2g, respectively. The mixture was stirred uniformly according to the stirring system of example 1 to obtain alkali slag cement slurry.
On the basis of the proportion of the alkali slag cement slurry material, 1800g of river sand with the maximum grain size of 4.75mm is added according to the glue-sand ratio of 1: 3, and the alkali slag cement slurry is prepared by uniformly stirring.
Example 4
The same proportions of materials as in example 3 were used, except that KCl was replaced with KBr, i.e., 600g of granulated blast furnace slag powder, 276g of water glass solution, 30g of KBr, Ba (NO)3)21.2g and 1800g of sand.
Example 5
The same material ratio as in example 3; with the difference that KNO is used3Instead of KCl, i.e. 600g of granulated blast furnace slag powder, 276g of water glass solution and KNO3 30g，Ba(NO3)21.2g and 1800g of sand.
The fluidity and setting time of the alkali slag cement slurry prepared in examples 1 to 5, the mechanical properties of alkali slag cement mortar, and the reference group data without inorganic salt are shown in table 1, and the change rates (%) of the fluidity, setting time, and strength are shown in table 2, compared with the reference group without inorganic salt.
TABLE 1
TABLE 2
In conclusion, compared with the chemically-excited cementing material without inorganic salt, the initial fluidity of the slurry is improved by 5.9-20.6%, the fluidity is kept higher in both 30min and 60min, the initial setting time is prolonged by 171-307%, the final setting time is prolonged by 124-232%, and the influence on the mechanical property of the chemically-excited cementing material is small.
Therefore, the compounding of the inorganic salt consisting of the negative hydrated ions can well improve the initial fluidity and the fluidity retentivity of the chemically excited cementing material, prolong the initial and final setting time, have small initial and final setting intervals and have small influence on the 28d strength.
Claims (10)
1. A method for adjusting the fluidity and the setting time of a chemically-activated cementing material system is characterized by comprising the following processes:
in the using process of the chemically excited cementing material, inorganic salt composed of negative hydrated ions is compounded and doped, and the inorganic salt composed of the negative hydrated ions adopts inorganic salt composed of ions with different hydration properties and different chemical radiuses.
2. The method for adjusting the fluidity and setting time of chemically activated cementitious material system according to claim 1, wherein the inorganic salt consisting of negative hydrated ions has an ionic radius of not less than 1.11 x 10-8m, the ions are negative hydrated ions.
3. The method for adjusting fluidity and setting time of chemically activated cementitious system as claimed in claim 2, wherein the inorganic salts of negative hydrated ions comprise KCl, KBr and KNO3And Ba (NO)3)2。
4. The method for adjusting the fluidity and setting time of a chemically activated cementitious system as in claim 3, wherein KCl, KBr or KNO3The content of the precursor is 3 to 5 percent of the mass of the precursor material of the chemically excited cementing material, and the Ba (NO) accounts for3)2The content of the precursor is 0.1-0.2% of the mass of the precursor material of the chemically excited cementing material.
5. The method for adjusting the fluidity and the setting time of a chemically activated cementitious material system according to claim 3, characterized in that, in the chemically activated cementitious material, granulated blast furnace slag powder is used as a precursor material, and a water glass solution is used as an alkali component.
6. The method for adjusting the fluidity and the setting time of the chemically activated cementitious material system as claimed in claim 5, wherein the content of the granulated blast furnace slag powder in the chemically activated cementitious material is 65-70% by mass, and the content of the water glass solution is 30-35% by mass.
7. The method for adjusting the fluidity and setting time of a chemically activated cementitious material system as claimed in claim 5 or 6, characterised in that the granulated blast furnace slag powder has a 7d activity index of not less than 75%, a 28d activity index of not less than 95% and a specific surface area of 400-470 m2A basicity index of not less than 1.0.
8. The method for adjusting the fluidity and setting time of a chemically activated cementitious system according to claim 5 or 6, characterised in that the modulus of the water glass solution is between 1.2 and 1.5 and the solute mass concentration is 25.0%.
9. The method of claim 1, wherein the chemically activated cementitious material is applied by a process comprising:
uniformly mixing a precursor material of the chemically excited cementitious material and inorganic salt consisting of negative hydrated ions, then adding an alkali component and uniformly stirring to obtain alkali slag cement paste;
and adding sand into the alkali slag cement paste and uniformly mixing to obtain the alkali slag cement mortar.
10. The method for adjusting the fluidity and the setting time of the chemically-activated cementitious material system according to claim 9, characterized in that after the alkali component is added, the mixture is stirred for 120s at the rotating speed of 140 plus or minus 5r/min, then is kept still for 15s, and is stirred for 120s at the rotating speed of 285 plus or minus 5r/min, so as to obtain alkali slag cement slurry;
when sand is added into the alkali slag cement slurry, river sand with the maximum grain diameter of 4.75mm is added according to the glue-sand ratio of 1: 3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115159949A (en) * | 2022-08-01 | 2022-10-11 | 西安建筑科技大学 | Low-carbon environment-friendly self-leveling repair mortar and preparation method thereof |
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| CN115159949A (en) * | 2022-08-01 | 2022-10-11 | 西安建筑科技大学 | Low-carbon environment-friendly self-leveling repair mortar and preparation method thereof |
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