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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- 239000000463 material Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 24
- 150000002500 ions Chemical class 0.000 claims abstract description 29
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 239000002243 precursor Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000036571 hydration Effects 0.000 claims abstract description 9
- 238000006703 hydration reaction Methods 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 37
- 239000003513 alkali Substances 0.000 claims description 30
- 239000004568 cement Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 17
- 239000004576 sand Substances 0.000 claims description 17
- 235000019353 potassium silicate Nutrition 0.000 claims description 15
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011083 cement mortar Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000014759 maintenance of location Effects 0.000 abstract 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 10
- 239000003638 chemical reducing agent Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000005284 excitation Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Inorganic materials [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明公开了一种调整化学激发胶凝材料体系流动性与凝结时间的方法，本发明在化学激发胶凝材料使用过程中将负水合离子组成的无机盐复配掺入，所述负水合离子组成的无机盐采用不同水合性能、不同化学半径的离子组成的无机盐。其中，负水合离子组成的无机盐包括KCl、KBr和KNO3中的一种以及Ba(NO3)2。KCl、KBr或KNO3的含量为化学激发胶凝材料前驱体材料质量的3％～5％，Ba(NO3)2的含量为化学激发胶凝材料前驱体材料质量的0.1％～0.2％。本发明能顾提高化学激发胶凝材料浆体的初始流动度和流动度保持性，延长凝结时间。与未掺加无机盐的化学激发胶凝材料相比，浆体初始流动度提高5.9％～20.6％，30min和60min均保持较高的流动度，初凝时间延长171％～307％，终凝时间延长124％～232％，且对化学激发胶凝材料的力学性能影响较小。The invention discloses a method for adjusting the fluidity and setting time of a chemically excited gelling material system. In the invention, an inorganic salt composed of negative hydrated ions is compounded and mixed in the process of using the chemically excited gelling material. The negatively hydrated ions The inorganic salts are composed of inorganic salts composed of ions with different hydration properties and different chemical radii. Wherein, the inorganic salt composed of negative hydrated ions includes one of KCl, KBr and KNO 3 and Ba(NO 3 ) 2 . The content of KCl, KBr or KNO 3 is 3% to 5% of the mass of the precursor material of the chemically activated cementitious material, and the content of Ba(NO 3 ) 2 is 0.1% to 0.2% of the mass of the precursor material of the chemically activated cementitious material. The invention can improve the initial fluidity and fluidity retention of the chemically activated cementitious material slurry and prolong the setting time. Compared with the chemically stimulated cementitious material without inorganic salt, the initial fluidity of the slurry is increased by 5.9% to 20.6%, the fluidity of the slurry is maintained at 30min and 60min, the initial setting time is prolonged by 171% to 307%, and the final setting The time is prolonged by 124% to 232%, and has little effect on the mechanical properties of chemically stimulated cementitious materials.
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)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110826134.9A CN113429134B (en) | 2021-07-21 | 2021-07-21 | Method for adjusting fluidity and setting time of chemically-activated cementing material system |
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| CN202110826134.9A CN113429134B (en) | 2021-07-21 | 2021-07-21 | Method for adjusting fluidity and setting time of chemically-activated cementing material system |
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| CN113429134A true CN113429134A (en) | 2021-09-24 |
| CN113429134B CN113429134B (en) | 2023-03-17 |
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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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