CN110467396A - A kind of preparation method of cracking resistance lower shrinkage cement mortar - Google Patents
A kind of preparation method of cracking resistance lower shrinkage cement mortar Download PDFInfo
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- CN110467396A CN110467396A CN201910810874.6A CN201910810874A CN110467396A CN 110467396 A CN110467396 A CN 110467396A CN 201910810874 A CN201910810874 A CN 201910810874A CN 110467396 A CN110467396 A CN 110467396A
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention belongs to cement mortar material fields, and in particular to a kind of preparation method of cracking resistance lower shrinkage cement mortar.The present invention is using discarded stalk as raw material, carbonized wooden fiber, mixing aggregate, coarse flour, hydroxymethyl cellulose, triethylamine, sodium sulfite is added by being dispersed with stirring in Xiang Shuizhong, obtain cracking resistance lower shrinkage cement mortar, organic thinner is quaternary ammonium cation cyclodextrin in the present invention, reduces the shrinkage of cement mortar and cement mortar is avoided to crack；Contain a large amount of lignin from the coarse flour recycled in stalk slag, on the one hand the modified material as cyclodextrin, the dispersion performance for improving cyclodextrin, sulfonic acid group is on the other hand introduced in lignin molecule, can keep the high degree of dispersion of cement granules, slurry is set to keep uniform density, the shrinkage for reducing the solidification later period additionally incorporates a certain amount of lignin, improves settled density of the cyclodextrin when surface of constructing bonds, the compression strength of reinforced cement mortar, has broad application prospects.
Description
Technical field
The invention belongs to cement mortar material fields, and in particular to a kind of preparation method of cracking resistance lower shrinkage cement mortar.
Background technique
The big and wide cement deep processed product of the cement products amount of being, since it is wide with raw material sources, corrosion fatigue life
The features such as length, maintenance cost is low, energy conservation and environmental protection, it has also become indispensable important building material product in the development of the national economy.In recent years
Come, with the continuous development of urbanization, large-scale city-building brings opportunity to cement products industry development, and as cement
Fence, these cement artistic products of garden landscape engineering etc. also can be widely used in building, water conservancy, traffic, afforestation
In equal engineering constructions, therefore, cement products has become the indispensable construction material of modern society.
Magnesium phosphate cement be by dead roasting magnesia, soluble phosphate and additive etc. according to a certain percentage, in acid item
It is chemically reacted under part by soda acid and what physical action generated is the inorganic coagulation material for cohering phase with phosphate；Such material exists
By chemical bonds under room temperature, have the main feature of silicates cementitious material and ceramic material, i.e. low-temperature setting, height
Early strong, strong, hardenite partial neutral of high volume stability, caking property etc..Phosphate energy and normal concrete in magnesium phosphate cement
In hydrated product or unhydrated clinker particles reaction generate equally with gelling calcium phosphate product, therefore with silicon
Near the bonding interface of hydrochlorate concrete, other than physical bond effect, there is also very strong chemical bonding effect, caking property compared with
It is high；Neutralization reaction is rapid after the soda acid component of magnesium phosphate cement meets water, and strength development is fast, and early strength especially hour intensity is non-
Chang Gao, this is that ordinary portland cement even quick hardening sulphoaluminate cement etc. is all incomparable；Magnesium phosphate cement sill
The water-cement ratio of slurry is low, and the contraction distortion of hydration and hardening process is only 1/10th of portland cement sill, volume stability
Property is good；The thermal expansion coefficient of magnesium phosphate cement sill and normal silicate concrete very close to, between hot property matching
Very well.Above-mentioned advantage makes magnesium phosphate cement sill become one of optimal repairing and reinforcing material of concrete structure.In phosphoric acid
In the preparation technique of magnesium cement-based material, the control of setting time and water stability is key technology.Magnesium phosphate cement sill
Condensation is fast, and heat of hydration early stage concentrates release, this has an adverse effect to constructing operation and later period performance, limits its use
Range.Magnesium phosphate cement sill is contacted with water for a long time, and there are water-soluble erosion phenomenon, the water curing intensity of test specimen is compared with age certainly
The intensity so conserved has different degrees of reduction, and water stability is to be improved, and which has limited its uses under water environment.Bone
Material has a major impact the intensity of magnesium phosphate cement sill, water stability and volume stability.Useful quartz sand, aluminium oxide
Sand, magnesium oxide sand and granite can prepare high-intensitive magnesium phosphate cement mortar as fine aggregate, but quartz sand, aluminum oxide sand,
Magnesium oxide sand and granite resource are limited, expensive, limit its use.
Cement mortar exists at present: the problems such as compression strength is general, and mechanical property is general, and crack resistance is general.
Therefore, inventing the excellent cement mortar of one kind has positive effect to cement mortar material field.
Summary of the invention
Present invention mainly solves the technical issues of, for current cement mortar hardening after it is dry-shrinkage deformed larger, at local place
It is easy to appear fine fisssure, causes compression strength lower, the poor defect of crack resistance provides a kind of cracking resistance lower shrinkage cement mortar
Preparation method.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
A kind of preparation method of cracking resistance lower shrinkage cement mortar, it is characterised in that specific preparation step are as follows:
Water is placed in blender, is further continued for that carbonized wooden fiber, mixing aggregate, coarse flour, hydroxymethyl cellulose, silicic acid is added
Salt cement, organic thinner, triethylamine, sodium sulfite after 20~25min of stir process, obtain cracking resistance lower shrinkage cement mortar；
The specific preparation step of the coarse flour are as follows:
Take 200~230g stalk slag, the sodium hydroxide solution that 400~450mL mass fraction is 45% is put into the water with blender
It bathes in reaction kettle, heating water bath heats up, and starts blender, stirs 3~5h, filtering, and removal filter residue divides gained filtrate with quality
Number is neutralized to neutrality for 95% glacial acetic acid, lignin suspension is obtained, with the revolving speed of 3500~3700r/min, high speed centrifugation 12
~15min, remove supernatant liquor, isolated lower sediment, after being washed with water precipitating 2~3 times, be placed in set temperature be 70~
In 80 DEG C of baking oven, dry 4~5h obtains coarse flour；
The specific preparation step of the coarse flour are as follows:
(1) sodium hydroxide solution that beta-cyclodextrin and mass fraction are 90% is added into beaker, stirs 10~15min at room temperature
Afterwards, epoxypropyltrimethylchloride chloride is added, is placed the beaker in water-bath, is heated to 50~55 DEG C, insulation reaction 3
~4h, filtering removal filtrate obtain product；
(2) by the above-mentioned product of 200~220g 200~250mL hot water dissolving, the dilute hydrochloric acid adjusting pH for being 10% with mass fraction
To 6~7, neutralizer is obtained, neutralizer is placed in the vacuum oven that set temperature is 80~90 DEG C, after dry 3~4h, is set
3~4h is ground in mortar, dried powder is obtained, by 50~55g dried powder 200~220mLN, dinethylformamide
Dissolution, obtains n,N-Dimethylformamide lysate；
(3) 150~170mL acetone is added to n,N-Dimethylformamide lysate, white slurry is obtained, by gained white slurry
The removal isolated product of filtrate is filtered, place the product in vacuum oven, dry 4~5h obtains organic thinner.
Each component raw material in the specific preparation step of cracking resistance lower shrinkage cement mortar, according to parts by weight, including 70
~80 parts of water, 12~15 parts of carbonized wooden fibers, 30~40 parts of mixing aggregates, 10~15 parts of coarse flours, 1~2 part of methylol fibre
Tie up element, 40~50 parts of portland cements, 20~25 portions of organic thinners, 0.8~1.0 part of triethylamine, 4~5 parts of sodium sulfites.
Carbonized wooden fiber is placed in calcining by wood fibre in the specific preparation step of cracking resistance lower shrinkage cement mortar
In furnace, stove evacuation will be calcined, is heated to 600~650 DEG C, 3~4h of high temperature carbonization is prepared.
Aggregate is mixed in the specific preparation step of cracking resistance lower shrinkage cement mortar by 200 mesh expanded perlites and 100
Mesh quartz sand is that 1 ︰ 3 is mixed to get in mass ratio.
Temperature is 90~95 DEG C after heating water bath heating in the specific preparation step of the coarse flour.
Each raw material component in the specific preparation step of the coarse flour (1), according to parts by weight, including 70~75 parts of β-rings
Sodium hydroxide solution, 5~10 parts of epoxypropyltrimethylchloride chlorides of dextrin, 100~130 parts of mass fractions for 90%.
The control of hot water dissolving's temperature is 60~65 DEG C in the specific preparation step of the coarse flour (2).
The solute matter of N,N-dimethylformamide lysate is further limited in the specific preparation step of the coarse flour (2)
Measuring content control is 20~25%.
The drying temperature control of organic thinner is 80~90 DEG C in the specific preparation step of the coarse flour (3).
The beneficial effects of the present invention are:
(1) present invention obtains lignin lye by heating soda boiling, by lignin lye acetic acid using discarded stalk as raw material
After neutralization, through high speed centrifugation, washs, is dried to obtain coarse flour, epoxypropyl trimethylammonium chloride is added after beta-cyclodextrin is alkalized
Product is obtained by filtration after ammonium heating reaction, by product with hot water dissolving, is dried to obtain after neutralization, grinding, recrystallization purification
Organic thinner, expanded perlite is mixed to get with quartz sand and mixes aggregate, and carbonized wooden fiber, mixing bone are added into water
Material, coarse flour, hydroxymethyl cellulose, triethylamine, sodium sulfite obtain cracking resistance lower shrinkage cement mortar, originally by being dispersed with stirring
Organic thinner is quaternary ammonium cation cyclodextrin in invention, and a small amount of quaternary ammonium cation cyclodextrin can be in water in cement mortar
In portland cement is coated in colloidal form, quaternary ammonium cation cyclodextrin can be to the sun on the metal silicate surface in cement
Repulsive interaction occurs for ion, and cyclodextrin is quickly bonded in aggregate surface, so that solidification later period aggregate be made mutually to arrange with cement granules
Reprimand reduces the shrinkage of cement mortar and cement mortar is avoided to crack；
(2) present invention contains a large amount of lignin from the coarse flour recycled in stalk slag, on the one hand as the modification of cyclodextrin
Substance has the property of larger space structure using lignin itself, biggish steric hindrance can be generated in cyclodextrin, favorably
In the dispersion performance for improving cyclodextrin, sulfonating reaction occurs for the sodium sulfite and lignin of addition, on the other hand in lignin point
Sulfonic acid group is introduced in son, the hydrophilicity of cement mortar can be improved, and the height point of cement granules can be kept before solidification
It dissipates, slurry is made to keep uniform density, reduce the shrinkage in solidification later period, additionally incorporate a certain amount of lignin, it is possible to increase ring
The average molecular weight of dextrin improves settled density of the cyclodextrin when surface of constructing bonds, thus the resistance to compression of reinforced cement mortar
Intensity has broad application prospects.
Specific embodiment
Take 200~230g stalk slag, the sodium hydroxide solution that 400~450mL mass fraction is 45% is put into blender
Water-bath kettle in, heating water bath is warming up to 90~95 DEG C, starts blender, stirs 3~5h, and filtering, removal filter residue is by institute
It obtains filtrate and is neutralized to neutrality with the glacial acetic acid that mass fraction is 95%, lignin suspension is obtained, with 3500~3700r/min's
Revolving speed, 12~15min of high speed centrifugation remove supernatant liquor, and isolated lower sediment is set after being washed with water precipitating 2~3 times
In the baking oven that set temperature is 70~80 DEG C, dry 4~5h obtains coarse flour；According to parts by weight, 70 are added into beaker
The sodium hydroxide solution that~75 parts of beta-cyclodextrins and 100~130 parts of mass fractions are 90%, after stirring 10~15min at room temperature,
5~10 parts of epoxypropyltrimethylchloride chlorides are added, are placed the beaker in water-bath, are heated to 50~55 DEG C, heat preservation
3~4h is reacted, filtering removal filtrate obtains product；It is 60~65 DEG C by the above-mentioned product of 200~220g 200~250mL temperature
Hot water dissolving, with mass fraction be 10% dilute hydrochloric acid adjust pH to 6~7, obtain neutralizer, by neutralizer be placed in setting temperature
In the vacuum oven that degree is 80~90 DEG C, after dry 3~4h, it is placed in 3~4h of grinding in mortar, dried powder is obtained, by 50
200~220mLN of~55g dried powder, dinethylformamide dissolution, obtains n,N-Dimethylformamide lysate, to N,
150~170mL acetone is added in dinethylformamide lysate, obtains white slurry；Above-mentioned white slurry is filtered into removal filter
The isolated product of liquid, place the product in set temperatures in 80~90 DEG C of vacuum oven, dry 4~5h is obtained organic
Thinner takes wood fibre to be placed in calcining furnace, will calcine stove evacuation, is heated to 600~650 DEG C, and high temperature carbonization 3~
4h obtains carbonized wooden fiber, with 100 mesh quartz sands is in mass ratio that 1 ︰ 3 is mixed by 200 mesh expanded perlites, is mixed
Aggregate；According to parts by weight, 70~80 parts of water are placed in blender, are further continued for addition 12~15 parts of carbonized wooden fibers, 30
~40 parts of mixing aggregates, 10~15 parts of coarse flours, 1~2 part of hydroxymethyl cellulose, 40~50 parts of portland cements, 20~25 parts
Organic thinner, 0.8~1.0 part of triethylamine, 4~5 parts of sodium sulfites after 20~25min of stir process, obtain cracking resistance lower shrinkage
Cement mortar.
Embodiment 1
The preparation of coarse flour:
Take 200g stalk slag, the sodium hydroxide solution that 400mL mass fraction is 45% is put into the water-bath kettle with blender
In, heating water bath is warming up to 90 DEG C, starts blender, stirs 3h, filtering, remove filter residue for gained filtrate is with mass fraction
95% glacial acetic acid is neutralized to neutrality, obtains lignin suspension, with the revolving speed of 3500r/min, high speed centrifugation 12min, in removal
Layer clear liquid, isolated lower sediment after being washed with water precipitating 2 times, are placed in the baking oven that set temperature is 70 DEG C, dry 4h,
Obtain coarse flour；
The preparation of product:
According to parts by weight, the sodium hydroxide solution that 70 parts of beta-cyclodextrins and 100 parts of mass fractions are 90% is added into beaker,
After stirring 10min at room temperature, 5 parts of epoxypropyltrimethylchloride chlorides are added, places the beaker in water-bath, is heated to
50 DEG C, insulation reaction 3h, filtering removal filtrate obtains product；
The preparation of white slurry:
Be 60 DEG C of hot water dissolving by 200g above-mentioned product 200mL temperature, with the dilute hydrochloric acid that mass fraction is 10% adjust pH to
6, neutralizer is obtained, neutralizer is placed in the vacuum oven that set temperature is 80 DEG C, after dry 3h, is placed in mortar and grinds
3h obtains dried powder, and by 50g dried powder 200mLN, dinethylformamide dissolution obtains n,N-Dimethylformamide
Lysate is added 150mL acetone to n,N-Dimethylformamide lysate, obtains white slurry；
Mix aggregate processing:
Above-mentioned white slurry is filtered into the removal isolated product of filtrate, place the product in the vacuum drying that set temperature is 80 DEG C
In case, dry 4h obtains organic thinner, wood fibre is taken to be placed in calcining furnace, will calcine stove evacuation, be heated to
600 DEG C, high temperature carbonization 3h obtains carbonized wooden fiber, is in mass ratio 1 ︰ 3 by 200 mesh expanded perlites and 100 mesh quartz sands
Mixing obtains mixing aggregate；
The preparation of cracking resistance lower shrinkage cement mortar:
According to parts by weight, 70 parts of water are placed in blender, are further continued for that 12 parts of carbonized wooden fibers, 30 parts of mixing bones are added
Material, 10 parts of coarse flours, 1 part of hydroxymethyl cellulose, 40 parts of portland cements, 20 portions of organic thinners, 0.8 part of triethylamine, 4 parts of Asias
Sodium sulphate after stir process 20min, obtains cracking resistance lower shrinkage cement mortar.
Embodiment 2
The preparation of coarse flour:
Take 215g stalk slag, the sodium hydroxide solution that 425mL mass fraction is 45% is put into the water-bath kettle with blender
In, heating water bath is warming up to 92.5 DEG C, starts blender, stirs 4h, filtering, remove filter residue for gained filtrate is with mass fraction
95% glacial acetic acid is neutralized to neutrality, obtains lignin suspension, with the revolving speed of 3600r/min, high speed centrifugation 13.5min, removal
Supernatant liquor, isolated lower sediment after being washed with water precipitating 2.5 times, are placed in the baking oven that set temperature is 75 DEG C, dry
4.5h obtains coarse flour；
The preparation of product:
According to parts by weight, it is molten that the sodium hydroxide that 72.5 parts of beta-cyclodextrins and 115 parts of mass fractions are 90% is added into beaker
Liquid adds 7.5 parts of epoxypropyltrimethylchloride chlorides, places the beaker in water-bath, add after stirring 12.5min at room temperature
Heat is warming up to 52.5 DEG C, insulation reaction 3.5h, and filtering removal filtrate obtains product；
The preparation of white slurry:
The hot water dissolving for being 62.5 DEG C with 225mL temperature by the above-mentioned product of 210g adjusts pH with the dilute hydrochloric acid that mass fraction is 10%
To 6.5, neutralizer is obtained, neutralizer is placed in the vacuum oven that set temperature is 85 DEG C, after dry 3.5h, is placed in mortar
Middle grinding 3.5h, obtains dried powder, and by 52.5g dried powder 210mLN, dinethylformamide dissolution obtains N, N- bis-
Methylformamide lysate is added 160mL acetone to n,N-Dimethylformamide lysate, obtains white slurry；
Mix aggregate processing:
Above-mentioned white slurry is filtered into the removal isolated product of filtrate, place the product in the vacuum drying that set temperature is 85 DEG C
In case, dry 4.5h obtains organic thinner, wood fibre is taken to be placed in calcining furnace, will calcine stove evacuation, be heated to
625 DEG C, high temperature carbonization 3.5h obtains carbonized wooden fiber, is in mass ratio by 200 mesh expanded perlites and 100 mesh quartz sands
1 ︰ 3 mixing obtains mixing aggregate；
The preparation of cracking resistance lower shrinkage cement mortar:
According to parts by weight, 75 parts of water are placed in blender, are further continued for that 13.5 parts of carbonized wooden fibers, 35 parts of mixing bones are added
Material, 12.5 parts of coarse flours, 1.5 parts of hydroxymethyl celluloses, 45 parts of portland cements, 22.5 portions of organic thinners, 0.9 part of three second
Amine .5 part sodium sulfite after stir process 22.5min, obtain cracking resistance lower shrinkage cement mortar.
Embodiment 3
The preparation of coarse flour:
Take 230g stalk slag, the sodium hydroxide solution that 450mL mass fraction is 45% is put into the water-bath kettle with blender
In, heating water bath is warming up to 95 DEG C, starts blender, stirs 5h, filtering, remove filter residue for gained filtrate is with mass fraction
95% glacial acetic acid is neutralized to neutrality, obtains lignin suspension, with the revolving speed of 3700r/min, high speed centrifugation 15min, in removal
Layer clear liquid, isolated lower sediment after being washed with water precipitating 3 times, are placed in the baking oven that set temperature is 80 DEG C, dry 5h,
Obtain coarse flour；
The preparation of product:
According to parts by weight, the sodium hydroxide solution that 75 parts of beta-cyclodextrins and 130 parts of mass fractions are 90% is added into beaker,
After stirring 15min at room temperature, 10 parts of epoxypropyltrimethylchloride chlorides are added, are placed the beaker in water-bath, heat temperature raising
To 55 DEG C, insulation reaction 4h, filtering removal filtrate obtains product；
The preparation of white slurry:
Be 65 DEG C of hot water dissolving by 220g above-mentioned product 250mL temperature, with the dilute hydrochloric acid that mass fraction is 10% adjust pH to
7, neutralizer is obtained, neutralizer is placed in the vacuum oven that set temperature is 90 DEG C, after dry 4h, is placed in mortar and grinds
4h obtains dried powder, and by 55g dried powder 220mLN, dinethylformamide dissolution obtains n,N-Dimethylformamide
Lysate is added 170mL acetone to n,N-Dimethylformamide lysate, obtains white slurry；
Mix aggregate processing:
Above-mentioned white slurry is filtered into the removal isolated product of filtrate, place the product in the vacuum drying that set temperature is 90 DEG C
In case, dry 5h obtains organic thinner, wood fibre is taken to be placed in calcining furnace, will calcine stove evacuation, be heated to
650 DEG C, high temperature carbonization 4h obtains carbonized wooden fiber, is in mass ratio 1 ︰ 3 by 200 mesh expanded perlites and 100 mesh quartz sands
Mixing obtains mixing aggregate；
The preparation of cracking resistance lower shrinkage cement mortar:
According to parts by weight, 80 parts of water are placed in blender, are further continued for that 15 parts of carbonized wooden fibers, 40 parts of mixing bones are added
Material, 15 parts of coarse flours, 2 parts of hydroxymethyl celluloses, 50 parts of portland cements, 25 portions of organic thinners, 1.0 parts of triethylamines, 5 parts of Asias
Sodium sulphate after stir process 25min, obtains cracking resistance lower shrinkage cement mortar.
Comparative example 1 and the preparation method of example 1 are essentially identical, have only the difference is that lacking organic thinner.
Comparative example 2 and the preparation method of example 1 are essentially identical, have only the difference is that lacking coarse flour.
The cement mortar of 3 Wuhu company of comparative example production.
Performance detection is carried out to the cement mortar in the present invention and comparative example respectively, testing result is as shown in table 1:
Detection method:
28d compression strength is detected referring to the standard of JGJ/T70-2009.
Fracture toughness is detected referring to the standard of ASTME1820-2006.
56d shrinking percentage is detected referring to the standard of AS2350.13.
1 cement mortar performance measurement result of table
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| 28d compression strength (MPa) | 38.7 | 42.3 | 45.6 | 23.6 | 26.9 | 33.7 |
| Fracture toughness (J/m2) | 12500 | 13000 | 13500 | 7000 | 8500 | 10500 |
| 56d shrinking percentage (%) | 0.089 | 0.093 | 0.097 | 0.076 | 0.082 | 0.085 |
By table 1, it can be seen that cracking resistance lower shrinkage cement mortar prepared by the present invention, compression strength is good, and fracture toughness is good,
Shrinking percentage is preferable, is less prone to crack, and crack resistance is preferable, has broad application prospects.
The foregoing is merely preferred modes of the invention, are not intended to limit the invention, all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of preparation method of cracking resistance lower shrinkage cement mortar, it is characterised in that specific preparation step are as follows:
Water is placed in blender, is further continued for that carbonized wooden fiber, mixing aggregate, coarse flour, hydroxymethyl cellulose, silicic acid is added
Salt cement, organic thinner, triethylamine, sodium sulfite after 20~25min of stir process, obtain cracking resistance lower shrinkage cement mortar；
The specific preparation step of the coarse flour are as follows:
Take 200~230g stalk slag, the sodium hydroxide solution that 400~450mL mass fraction is 45% is put into the water with blender
It bathes in reaction kettle, heating water bath heats up, and starts blender, stirs 3~5h, filtering, and removal filter residue divides gained filtrate with quality
Number is neutralized to neutrality for 95% glacial acetic acid, lignin suspension is obtained, with the revolving speed of 3500~3700r/min, high speed centrifugation 12
~15min, remove supernatant liquor, isolated lower sediment, after being washed with water precipitating 2~3 times, be placed in set temperature be 70~
In 80 DEG C of baking oven, dry 4~5h obtains coarse flour；
The specific preparation step of the coarse flour are as follows:
(1) sodium hydroxide solution that beta-cyclodextrin and mass fraction are 90% is added into beaker, stirs 10~15min at room temperature
Afterwards, epoxypropyltrimethylchloride chloride is added, is placed the beaker in water-bath, is heated to 50~55 DEG C, insulation reaction 3
~4h, filtering removal filtrate obtain product；
(2) by the above-mentioned product of 200~220g 200~250mL hot water dissolving, the dilute hydrochloric acid adjusting pH for being 10% with mass fraction
To 6~7, neutralizer is obtained, neutralizer is placed in the vacuum oven that set temperature is 80~90 DEG C, after dry 3~4h, is set
3~4h is ground in mortar, dried powder is obtained, by 50~55g dried powder 200~220mLN, dinethylformamide
Dissolution, obtains n,N-Dimethylformamide lysate；
(3) 150~170mL acetone is added to n,N-Dimethylformamide lysate, white slurry is obtained, by gained white slurry
The removal isolated product of filtrate is filtered, place the product in vacuum oven, dry 4~5h obtains organic thinner.
2. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is anti-
Each component raw material in the specific preparation step of lower shrinkage cement mortar is split, according to parts by weight, including 70~80 parts of water, 12~15 parts
Carbonized wooden fiber, 30~40 parts of mixing aggregates, 10~15 parts of coarse flours, 1~2 part of hydroxymethyl cellulose, 40~50 parts of silicic acid
Salt cement, 20~25 portions of organic thinners, 0.8~1.0 part of triethylamine, 4~5 parts of sodium sulfites.
3. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is anti-
It splits carbonized wooden fiber in the specific preparation step of lower shrinkage cement mortar to be placed in calcining furnace by wood fibre, calcining furnace be taken out true
Sky is heated to 600~650 DEG C, and 3~4h of high temperature carbonization is prepared.
4. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is anti-
It splits and mixes aggregate in the specific preparation step of lower shrinkage cement mortar by 200 mesh expanded perlites and 100 mesh quartz sands in mass ratio
It is mixed to get for 1 ︰ 3.
5. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is thick
Temperature is 90~95 DEG C after heating water bath heating in the specific preparation step of wood powder.
6. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is thick
Each raw material component in the specific preparation step of wood powder (1), according to parts by weight, including 70~75 parts of beta-cyclodextrins, 100~130 parts
Sodium hydroxide solution, 5~10 part epoxypropyltrimethylchloride chlorides of the mass fraction for 90%.
7. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is thick
The control of hot water dissolving's temperature is 60~65 DEG C in the specific preparation step of wood powder (2).
8. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is thick
Further limited in the specific preparation step of wood powder (2) the Solute mass content control of N,N-dimethylformamide lysate for 20~
25%。
9. a kind of preparation method of cracking resistance lower shrinkage cement mortar according to claim 1, it is characterised in that: described is thick
The drying temperature control of organic thinner is 80~90 DEG C in the specific preparation step of wood powder (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113135702A (en) * | 2021-05-17 | 2021-07-20 | 佛山市联益建筑材料有限公司 | Anti-cracking and anti-impact concrete and preparation method thereof |
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Application publication date: 20191119 |