CN110451901B - Super-early-strength high-ductility low-shrinkage mortar and preparation method thereof - Google Patents
Super-early-strength high-ductility low-shrinkage mortar and preparation method thereof Download PDFInfo
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- CN110451901B CN110451901B CN201910825970.8A CN201910825970A CN110451901B CN 110451901 B CN110451901 B CN 110451901B CN 201910825970 A CN201910825970 A CN 201910825970A CN 110451901 B CN110451901 B CN 110451901B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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
- 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
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Abstract
The invention discloses super-early-strength high-ductility low-shrinkage mortar and a preparation method thereof, wherein the mortar comprises the following substances in parts by weight: 60-76 parts of sulphoaluminate cement, 4-12 parts of portland cement, 20-28 parts of fly ash, 28-32 parts of fine aggregate, 18-24 parts of water and 1.5-2.0 parts of polyvinyl alcohol fiber. The preparation method comprises the following steps: a. dissolving a water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture; b. mixing sulphoaluminate cement, portland cement, fly ash and fine aggregate according to the weight ratio at the rotating speed of 140-160r/min for 1-5 min; c. slowly adding 80-90 wt% of the mixture, and stirring at a rotating speed of 180-; d. finally, the rest 10-20wt% of the mixture is added, stirred for 2-4min at the rotating speed of 260-290r/min and stirred evenly. The super early strength, high ductility and low shrinkage mortar of the mortar prepared by the invention meets the requirements of construction on the working performance while improving the early strength of the mortar, and optimizes the service performance while improving the construction efficiency.
Description
Technical Field
The invention relates to a fiber reinforced cement-based composite material, in particular to super-early-strength high-ductility low-shrinkage mortar and a preparation method thereof.
Background
The traditional mortar is easy to have brittle failure, low in tensile strength and poor in ductility, and the inherent defects of the traditional mortar shorten the service life of the structure and limit the application range of the material. The engineering fiber reinforced cement-based composite material (ECC) is a novel building material designed by taking ultrahigh ductility as a target based on the analysis of mesomechanics on mechanical behaviors of fibers, a matrix and an interface, can generate an elastoplastic deformation behavior similar to steel during stretching, has a limit tensile strain of more than 3 percent, and can well solve the problems of brittle cracking and the like of the traditional cement-based materials such as mortar and the like. In practical engineering applications, the conventional ECC has low early strength, requires curing for a long time to reach design strength, and has no advantage in engineering with high requirement on early strength because it does not contain coarse aggregate, resulting in excessive drying shrinkage and causing related durability problems.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide the ultra-early-strength high-ductility low-shrinkage mortar, and the invention also aims to provide the preparation method of the ultra-early-strength high-ductility low-shrinkage mortar with high construction efficiency and good repeatability.
The technical scheme is as follows: the invention relates to super-early-strength high-ductility low-shrinkage mortar which comprises the following substances in parts by weight: 60-76 parts of sulphoaluminate cement, 4-12 parts of portland cement, 20-28 parts of fly ash, 28-32 parts of fine aggregate, 18-24 parts of water and 1.5-2.0 parts of polyvinyl alcohol fiber.
Wherein the sulphoaluminate cement is a low alkalinity sulphoaluminate cement of l.sac.42.5. The portland cement is p.ii.42.5 portland cement. The fly ash is class I fly ash. The fine aggregate is 80-100 mesh quartz sand. The polyvinyl alcohol fibers had a density of 1.3g/cm3Polyvinyl alcohol chopped fibers having an ultimate tensile strength of not less than 1200MPa, an ultimate elongation of not less than 8% and an elastic modulus of 38.0 GPa. The water is dissolved with a polycarboxylic acid water reducing agent with the solid content of more than or equal to 20 percent. 0.40-0.85 part of polycarboxylic acid water reducing agent.
The preparation method of the super-early-strength high-ductility low-shrinkage mortar comprises the following steps:
a. dissolving a water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture;
b. mixing sulphoaluminate cement, portland cement, fly ash and fine aggregate according to the weight ratio at the rotating speed of 140-160r/min for 1-5 min;
c. slowly adding 80-90 wt% of the mixture, and stirring at a rotation speed of 180-;
d. and finally, adding the rest 10-20wt% of the mixture, stirring at the rotating speed of 260-290r/min for 2-4min, and uniformly stirring to obtain the ultra-early-strength high-ductility low-shrinkage mortar.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the super early strength, high ductility and low shrinkage mortar of the prepared mortar meets the requirement of construction on the working performance while improving the early strength of the mortar, and optimizes the service performance while improving the construction efficiency;
2. the domestic polyvinyl alcohol fiber is used for replacing imported polyvinyl alcohol fiber, so that the construction cost is reduced, part of sulphoaluminate cement and portland cement are replaced by fly ash, the fluidity and the water retention of slurry are improved, the particle gradation is optimized, and the fibers in the mortar are easier to disperse uniformly.
Drawings
FIG. 1 is a graph of uniaxial tensile test stress-strain curves for ages 3h, 1d and 28d of the present invention;
FIG. 2 is a graph of shrinkage on drying values as a function of age in accordance with the present invention.
Detailed Description
In the following examples, the sulphoaluminate cement is L.SAC.42.5 low alkalinity sulphoaluminate cement, the portland cement is P.II.42.5 portland cement, the fly ash is class I fly ash, the fine aggregate is 80-100 mesh quartz sand, the polyvinyl alcohol fiber is 1.3g/em density3Polyvinyl alcohol chopped fibers having a length of 12mm, a diameter of 38 [ mu ] m, an ultimate tensile strength of not less than 1200MPa, an ultimate elongation of not less than 8%, and an elastic modulus of 38.0 GPa.
The curing schedule for the samples prepared in the following examples was:
after pouring test pieces for the cubic compressive strength test and the uniaxial tensile test, placing the test pieces with the moulds into a standard curing room (the temperature is 20 +/-2 ℃ and the relative humidity is more than or equal to 90%), curing to the test age when the test age is not more than 1d, removing the moulds and immediately testing; and when the test age exceeds 1d, curing for 1d, demolding, and placing into a standard curing room for curing until the test age is tested.
The test piece for the drying shrinkage performance test is subjected to mold maintenance for 1d in a standard maintenance room (the temperature is 20 +/-2 ℃ and the relative humidity is more than or equal to 90 percent), then is demoulded, is put into water (the temperature is 20 +/-2 ℃) to be maintained for 7d, and is transferred into a maintenance box (the temperature is 20 +/-2 ℃ and the relative humidity is 60 +/-5 percent) to be maintained for 90 d.
Example 1
The super-early-strength high-ductility low-shrinkage mortar comprises the following components in parts by weight: 60 parts of sulphoaluminate cement, 4 parts of Portland cement, 24 parts of fly ash, 32 parts of fine aggregate, 20 parts of water, 1.9 parts of polyvinyl alcohol fiber and 0.6 part of polycarboxylic acid water reducing agent.
The preparation method comprises the following steps:
dissolving a polycarboxylic acid water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture;
step two, weighing the components in parts by weight, and dry-stirring the sulphoaluminate cement, the Portland cement, the fly ash and the fine aggregate for 2min at a rotating speed of 140 r/min;
slowly adding 80 wt% of water dissolved with all the water reducing agent, and wet-stirring at the rotating speed of 190r/min for 3min to form uniform slurry;
and step four, finally adding the residual 20wt% of the water dissolved with the polycarboxylic acid water reducer, carrying out wet stirring for 2min at the rotating speed of 280r/min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Example 2
The super-early-strength high-ductility low-shrinkage mortar comprises the following components in parts by weight: 64 parts of sulphoaluminate cement, 8 parts of Portland cement, 28 parts of fly ash, 28 parts of fine aggregate, 18 parts of water, 1.6 parts of polyvinyl alcohol fiber and 0.75 part of polycarboxylic acid water reducing agent.
The preparation method comprises the following steps:
dissolving a polycarboxylic acid water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture;
step two, weighing the components in parts by weight, and dry-stirring the sulphoaluminate cement, the Portland cement, the fly ash and the fine aggregate for 4min at a rotating speed of 150 r/min;
step three, slowly adding 85 wt% of water dissolved with the polycarboxylic acid water reducing agent, and wet-stirring at the rotating speed of 185r/min for 5min to form uniform slurry;
and step four, finally adding the remaining 15 wt% of the water dissolved with the polycarboxylic acid water reducer, carrying out wet stirring for 3min at the rotating speed of 280r/min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Example 3
The super-early-strength high-ductility low-shrinkage mortar comprises the following components in parts by weight: 76 parts of sulphoaluminate cement, 10 parts of Portland cement, 20 parts of fly ash, 31 parts of fine aggregate, 22 parts of water, 1.8 parts of polyvinyl alcohol fiber and 0.5 part of polycarboxylic acid water reducing agent.
The preparation method comprises the following steps:
dissolving a polycarboxylic acid water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture;
step two, weighing the components in parts by weight, and dry-stirring the sulphoaluminate cement, the Portland cement, the fly ash and the fine aggregate for 2min at a rotating speed of 140 r/min;
step three, slowly adding 88 wt% of water dissolved with the polycarboxylic acid water reducing agent, and wet-stirring at the rotating speed of 185r/min for 5min to form uniform slurry;
and step four, finally adding the remaining 12 wt% of the water dissolved with the polycarboxylic acid water reducer, carrying out wet stirring for 2min at the rotating speed of 285r/min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Example 4
The super-early-strength high-ductility low-shrinkage mortar comprises the following components in parts by weight: 68 parts of sulphoaluminate cement, 12 parts of Portland cement, 26 parts of fly ash, 30 parts of fine aggregate, 24 parts of water, 1.7 parts of polyvinyl alcohol fiber and 0.45 part of polycarboxylic acid water reducing agent. The preparation method is the same as that of example 2.
Example 5
The preparation method of the super-early-strength high-ductility low-shrinkage mortar comprises the following steps:
dissolving 0.40 part of water reducing agent in 18 parts of water, and adding pre-dispersed 1.5 parts of polyvinyl alcohol fiber to form a mixture;
step two, stirring 60 parts of sulphoaluminate cement, 4 parts of Portland cement, 20 parts of fly ash and 28 parts of fine aggregate for 1min at the rotating speed of 140 r/min;
step three, slowly adding 80 wt% of the mixture, and stirring at the rotating speed of 180r/min for 3 min;
and step four, finally adding the rest 20wt% of the mixture, stirring for 2min at the rotating speed of 260r/min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Example 6
The preparation method of the super-early-strength high-ductility low-shrinkage mortar comprises the following steps:
dissolving 0.85 part of water reducing agent in 24 parts of water, and adding 2.0 parts of pre-dispersed polyvinyl alcohol fibers to form a mixture;
step two, stirring 76 parts of sulphoaluminate cement, 12 parts of Portland cement, 28 parts of fly ash and 32 parts of fine aggregate for 5min at the rotating speed of 160 r/min;
step three, slowly adding the mixture of 90 wt% and stirring for 6min at the rotating speed of 200 r/min;
and step four, finally adding the rest 10 wt% of the mixture, stirring for 4min at the rotating speed of 290r/min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Example 7
The preparation method of the super-early-strength high-ductility low-shrinkage mortar comprises the following steps:
dissolving 0.65 part of water reducing agent in 21 parts of water, and adding pre-dispersed 1.7 parts of polyvinyl alcohol fiber to form a mixture;
step two, stirring 68 parts of sulphoaluminate cement, 8 parts of Portland cement, 24 parts of fly ash and 30 parts of fine aggregate for 3min at the rotating speed of 150 r/min;
step three, slowly adding 85 wt% of the mixture, and stirring at the rotating speed of 190r/min for 5 min;
and step four, finally adding the rest 15 wt% of the mixture, stirring at the rotating speed of 275r/min for 3min, and uniformly stirring to obtain the super-early-strength high-ductility low-shrinkage mortar.
Comparative example 1
The mortar comprises the following components in parts by weight: 64 parts of sulphoaluminate cement, 0 part of Portland cement, 28 parts of fly ash, 28 parts of fine aggregate and 18 parts of water; taking the total volume of the sulphoaluminate cement, the Portland cement, the fly ash, the fine aggregate and the water after being uniformly mixed as a base number, wherein the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent; the water of the used components is dissolved with a polycarboxylic acid water reducing agent with the solid content not less than 20 percent, and the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the sulphoaluminate cement, the silicate cement and the fly ash. The preparation method is the same as that of example 2.
Comparative example 2
The mortar comprises the following components in parts by weight: 64 parts of sulphoaluminate cement, 8 parts of Portland cement, 64 parts of fly ash, 28 parts of fine aggregate and 18 parts of water; taking the total volume of the sulphoaluminate cement, the Portland cement, the fly ash, the fine aggregate and the water after being uniformly mixed as a base number, wherein the volume mixing amount of the polyvinyl alcohol fiber is 2.0 percent; the water of the used components is dissolved with a polycarboxylic acid water reducing agent with the solid content not less than 20 percent, and the mixing amount of the polycarboxylic acid water reducing agent is 0.6 percent of the total mass of the sulphoaluminate cement, the silicate cement and the fly ash. The preparation method is the same as that of example 2.
A cube compression strength test is carried out on a 100mm cube test piece formed according to the mixing proportion, the preparation method and the curing system of the examples 1 to 4 and the comparative examples 1 to 2 by referring to GB/T50081-2002 Standard of the test method for mechanical properties of ordinary concrete, and the cube compression strength of 3h, 1d and 28d ages is measured. Specific cube compressive strength values of examples 1-4 and comparative examples 1-2 are shown in Table 1.
Uniaxial tensile test was performed on dumbbell-shaped test pieces molded according to the mixing ratios, the preparation methods and the curing regimes of examples 1 to 4 and comparative examples 1 to 2 with reference to JC/T2461-2018, namely "mechanical property test method for high-ductility fiber reinforced cement-based composite material", and the ductility at the age of 3h, 1d and 28d was measured. Stress-strain curves of example 1 in the uniaxial tensile test at ages of 3h, 1d and 28d are shown in FIG. 1, and specific uniaxial tensile ductility of examples 1 to 4 and comparative examples 1 to 2 are shown in Table 1.
A test piece of 40mm multiplied by 160mm formed according to the mixing proportion, the preparation method and the curing system of the examples 1 to 4 and the comparative examples 1 to 2 is subjected to a drying shrinkage performance test according to GB/T29417 and 2012 test method for drying shrinkage cracking performance of cement mortar and concrete, and the drying shrinkage value within 90d age is measured. The change curves of the shrinkage on drying values with age of examples 1 and comparative examples 1 to 2 are shown in FIG. 2, and specific shrinkage on drying values of examples 1 to 4 and comparative examples 1 to 2 are shown in Table 1.
TABLE 1 comparison of Performance parameters of mortars prepared in examples 1 to 4 and comparative examples 1 to 2
As can be seen from Table 1, the cubic compressive strength of examples 1 to 4 is not less than 35MPa in age 3h, not less than 45MPa in age 1d, and not less than 65MPa in age 28d, i.e., the prepared mortar is super early strength mortar; in the embodiments 1-4, the uniaxial tension ductility age is not less than 5% in 3h, not less than 4% in 1d, and not less than 3% in 28d, i.e., the prepared super early strength mortar is also super early strength high ductility mortar; the drying shrinkage values of the embodiments 1-4 are not more than 400 mu epsilon at the age of 90d, and are lower than 500 mu epsilon and 900 mu epsilon of common concrete, namely the prepared super early-strength high-ductility mortar is also super early-strength high-ductility low-shrinkage mortar.
Claims (1)
1. A preparation method of super early strength high ductility low shrinkage mortar is characterized by comprising the following steps:
(a) dissolving a water reducing agent in water, and adding pre-dispersed polyvinyl alcohol fibers to form a mixture;
(b) mixing sulphoaluminate cement, portland cement, fly ash and fine aggregate according to the weight ratio at the rotating speed of 140-160r/min for 1-5 min;
(c) slowly adding 80-90 wt% of the mixture, and stirring at a rotation speed of 180-;
(d) finally, adding the rest 10-20wt% of the mixture, stirring at the rotating speed of 260-290r/min for 2-4min, and uniformly stirring;
the super-early-strength high-ductility low-shrinkage mortar comprises the following substances in parts by weight: 60-76 parts of sulphoaluminate cement, 4-12 parts of portland cement, 20-28 parts of fly ash, 28-32 parts of fine aggregate, 18-24 parts of water and 1.5-2.0 parts of polyvinyl alcohol fiber; the sulphoaluminate cement is L.SAC.42.5 low alkalinity sulphoaluminate cement; the Portland cement is P, II, 42.5, portland cement; the fly ash is I-grade fly ash; the fine aggregate is 80-100 meshes of quartz sand; the polyvinyl alcohol fiber has a density of 1.3g/cm3Polyvinyl alcohol chopped fibers with ultimate tensile strength not less than 1200MPa, ultimate elongation not less than 8% and elastic modulus 38.0 GPa; a polycarboxylic acid water reducing agent with the solid content of more than or equal to 20 percent is dissolved in the water; and 0.40-0.85 part of polycarboxylic acid water reducing agent.
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| CN103482927A (en) * | 2013-09-02 | 2014-01-01 | 东南大学 | High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof |
| CN105948665A (en) * | 2016-05-04 | 2016-09-21 | 武汉理工大学 | Early-strength, low-shrinkage and high-toughness cement-based engineering material and preparation method thereof |
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| CN104211358B (en) * | 2014-09-11 | 2016-06-22 | 中国中材国际工程股份有限公司 | A kind of high-early-strength high ductility cement-base composite material and preparation method thereof |
| FR3045035B1 (en) * | 2015-12-10 | 2021-01-08 | Vicat | DUCTILE CONSTRUCTION MATERIAL |
| CN106517961B (en) * | 2016-11-24 | 2019-02-19 | 河北工业大学 | A kind of high tenacity cement-base composite material and preparation method thereof with low Investigation of drying shrinkage of high |
| CN107140921A (en) * | 2017-06-29 | 2017-09-08 | 上海罗洋新材料科技有限公司 | A kind of high ductility cement-base composite material of super hardening and preparation method thereof |
| CN107285714B (en) * | 2017-07-31 | 2022-06-07 | 北京中震建筑科学研究院有限公司 | High-ductility polyvinyl alcohol fiber concrete and preparation method thereof |
| CN107488018A (en) * | 2017-08-23 | 2017-12-19 | 同济大学 | A kind of sulphoaluminate cement base superelevation ductility concrete and preparation method thereof |
| CN108529968B (en) * | 2018-04-25 | 2020-07-24 | 浙江大学 | Fiber concrete material for 3D printing and preparation method thereof |
| CN109942262B (en) * | 2019-03-26 | 2021-06-22 | 东南大学 | Fiber reinforced cement-based material for 3D printing, preparation, performance evaluation and application |
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| CN103482927A (en) * | 2013-09-02 | 2014-01-01 | 东南大学 | High-crack-resistance low-shrinkage high-ductility mortar and preparation method thereof |
| CN105948665A (en) * | 2016-05-04 | 2016-09-21 | 武汉理工大学 | Early-strength, low-shrinkage and high-toughness cement-based engineering material and preparation method thereof |
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