CN107915444A - A kind of Desert Sand PVA fiber high performance concretes - Google Patents

A kind of Desert Sand PVA fiber high performance concretes Download PDF

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Publication number
CN107915444A
CN107915444A CN201711245538.9A CN201711245538A CN107915444A CN 107915444 A CN107915444 A CN 107915444A CN 201711245538 A CN201711245538 A CN 201711245538A CN 107915444 A CN107915444 A CN 107915444A
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sand
water
pva
high performance
cement
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车佳玲
刘海峰
韩冠生
李权威
王丹
柴立志
杨淑娟
王中阳
陈宙颖
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Ningxia University
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Ningxia University
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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
    • C04B28/04—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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Revetment (AREA)

Abstract

A kind of Desert Sand PVA fiber high performance concretes, the composition of the high performance concrete is water, cement, flyash, sand, and the sand is made of river sand and Desert Sand, its mass ratio is (0.9~0.7):(0.1~0.3) wherein, by mass percentage, water：Cement：Flyash：Sand=1：1.875：1.25：1.125；Using the cumulative volume of water, cement, flyash, sand after mixing as radix, the volume of PVA fibers is the 2% of volume of concrete；The high performance concrete replaces a part of river sand amount with Desert Sand, and coal ash instead part of cement, without coarse aggregate, intensity meets the Concrete Structure Design requirement, and light-weight environment-friendly, ductility are high.

Description

A kind of Desert Sand PVA fiber high performance concretes
Technical field
Technical field of concrete preparation of the present invention, particularly Desert Sand PVA fiber high performance concretes.
Background technology
Concrete is most popular material in building structure, and concrete building structures are frequently hit load and earthquake Effect, the effect of these external force can cause building construction different degrees of or even rupture failure occur, improve the property of concrete material Can play the role of important to the performance for improving building structure entirety, China is increased using concrete in performance at present, but There is also following defect：
1) the transition exploitation to bone material etc., causes environment to be damaged.With the progress of science and technology, national life water Benefit improves on ordinary days, and to meet the high ductility of concrete, durability, the overall anti-seismic performance for improving building structure, largely consumes the energy Natural sand stone aggregate is exploited, is done great damage to environment.In recent years, China is in large-scale basis engineering construction period, both Building structure aseismatic performance can be improved, the concrete that does not destroy and can turn waste into wealth to natural environment is also can guarantee that, is follow-up work An important research and developing direction for journey structure.
2) concrete manufacturing cost is higher, performance raising is not notable.Current western China is in city basis and builds It is high if the peak period of development, is widely used for high performance concrete in large bridges, railway engineering, municipal works Performance concrete gel material content compared with normal concrete is larger, and cost of manufacture is higher, but the compression strength of concrete After raising, its tension, shearing strength are relatively low, and ductility is relatively poor, so as to reduce the anti-seismic performance of concrete structure.Pass Natural sand is the rock debris for being formed and being accumulated in the natural water areas such as river, lake used by system concrete, in recent years concrete Usage amount is increasing, and natural sand resource is substantially exhausted, furthermore for northwest desert area and sand ground area, Desert Sand money Source is very abundant, but construction material shortage of resources and cost of transportation take higher, add construction cost.Prepare light-weight environment-friendly, height The concrete of ductility is a problem to be solved.
3) the preparation process environment protecting of concrete is poor, and overall cost is high.In recent years, PVA fiber concretes are quickly grown, By extensively in large-scale Practical Project.PVA fibers have that modulus is high, fire resistance is good, wear-resisting and antiacid alkali, with cement, gypsum etc. Base material has good associativity, and pollution-free, nontoxic, harmless green building material, and at present, the country is preparing material side More preferable developing direction is obtained to no, if it is possible to is gathered materials on the spot, is replaced part river sand with Desert Sand, flyash replaces part Cement, rationally using cheap local supplies, to greatest extent and efficiently utilizes industrial residue, prepares light-weight environment-friendly, high ductility Concrete, all there is weight for reducing local project cost, protection local environment and rational exploitation and utilization locality natural resources Want meaning.
4) architectural engineering frequently with concrete be made of materials such as sand, cement, stones, industry often produces one ton of cement will The pernicious gases such as discharge 1 ton of carbon dioxide, nitrogen dioxide, sulfur dioxide, pollute natural environment, harmful.
In view of this, it is special to propose the present invention.
The content of the invention
In light of the defects in the prior art, the purpose of the invention is to provide a kind of Desert Sand PVA fiber high-performance mix Solidifying soil and preparation method thereof, using accurate Desert Sand PVA fiber high-performance concrete mixes, part river is replaced with Desert Sand Sand, gathers materials on the spot, and makes full use of Desert Resources.
In order to solve the above technical problems, the present invention adopts the following technical scheme that；
A kind of Desert Sand PVA fiber high performance concretes, the composition of the high performance concrete is water, cement, flyash, Sand, the sand are made of river sand and Desert Sand, its mass ratio is (0.9~0.7):(0.1~0.3), wherein, by quality percentage Than meter, water：Cement：Flyash：Sand=1：1.875：1.25：1.125；With water, cement, flyash, sand after mixing total Volume is radix, and the volume of PVA fibers is the 2% of volume of concrete.
Optionally, 42.5 Portland cements of cement P.O, the flyash are I grade of flyash.
Optionally, it is 30% high performance water reducing agent of polyocarboxy acid added with water-reducing rate in the concrete, the water-reducing agent adds Dosage is the water, cement, flyash, river sand, the 0.03%~0.3% of gross mass.
Optionally, the PVA fibers are high-strength and high-modulus polyethanol fiber, its diameter D=0.031mm, density 1300kg/ m3, intensity 1600MPa, Young's modulus >=380GPa.
Optionally, to wash river sand, its diameter Dmax=1.18mm, the Desert Sand average diameter is the river sand 0.238mm。
A kind of Desert Sand PVA fibers high performance concrete preparation method, comprises the following steps：
S1:Cement, river sand and Desert Sand will be weighed in proportion to pour into mixer, be stirred 1 minute, then will be weighed fine coal Ash is poured into mixer and stirred 2 minutes；
S2:The water-reducing agent and water weighed in proportion, water-reducing agent is poured into water after its water-reducing agent is sufficiently scatter, then It is poured into mixer and stirs 2 minutes；
S3:After the addition of PVA fibers will be weighed in proportion, after stirring 4 minutes, up to the high property of the Desert Sand PVA fibers Can concrete.
Optionally, S2 coolant-temperature gages are 5~35 DEG C；
Optionally, in S3, PVA fibers must be uniformly dispersed in material, to play the toughness of PVA fibers, stirred During by the PVA fiber process to present batting shape be stirred for during be slowly added to by several times, make PVA fibers dispersed In the material, the ductility of PVA fiber concretes is improved.
Compared with prior art, the beneficial effects of the invention are as follows：
1) part is replaced to build the river sand used with Desert Sand in building material, while meeting engineering design, Gather materials on the spot, it is rational to utilize local Desert Resources.
2) part of cement is replaced with flyash, using local material and industrial waste, reduces noxious gas emission, there is environmental protection Effect.
3) concrete is light material without coarse aggregate compared with normal concrete；PVA fibers are added in material, Flexural strength and bending strength are obviously improved, higher than normal concrete.
4) production method of the invention is simple to whole work progress from producing, and concrete performance is high, mechanical property and resistance to Long performance meets design requirement, and greatly reduces the manufacture cost of concrete, which moves towards heavy construction by testing Actual use, be conducive to Site quality control, the characteristics of rigidity is big, deformation is small, durability is good, be particularly suitable for and the modern times are public Road, railway, the beam of skyscraper, column, shear wall etc. use.
Embodiment
In order to make those skilled in the art more fully understand the present invention, the present invention is made with reference to embodiment It is further to describe in detail.
The mass ratio of each material of concrete of the present invention, which can convert, draws its dosage by every cubic metre, or uses Every cubic metre of conversion draws quality of materials ratio, and amount ratio uses more, the application of statement more closing to reality in building field.This hair It is bright to create by National Nature youth Projects (51408328), project of national nature science fund project (11162015), peaceful Summer youth skilled personnel lift engineering subsidy, with reference to anti-seismic performance of the R/ECC Coupled Shear Walls structure based on optimal surrender mechanism Design theory and method (51408328) is used as research theory base with desert sand concrete dynamic failure mechanism (11162015) Plinth.
Embodiment one：
A kind of Desert Sand PVA fibers high performance concrete of the present invention is prepared by following raw material：
The composition of concrete is water, cement, flyash, sand, wherein, by mass percentage, water：Cement：Flyash：Sand =1：1.875：1.25：1.125, the sand implemented in one does not contain Desert Sand, can choose the Yellow River washing river sand, its diameter Dmax =1.18mm, cement use 42.5 Portland cements of P.O, weigh cement respectively, river sand weight is 6.34kg, 3.81kg, Pour into mixer, stir 1 minute；
Secondly the flyash 4.23kg weighed is poured into mixer and stirred 2 minutes, coal dust ash is I grade of flyash, is Plant wastes, such as the coal dust ash that Lingwu steam power plant produces, are generally all handled, environmental protection of the invention puts it by the way of landfill One, it is exactly the material by the use of trade waste as concrete, the part water among concrete is replaced using discarded flyash Mud, substitution rate 40%, under material mixture ratio in the present embodiment, can replace ensureing on the basis of the river sand of part in Desert Sand The performance requirement of concrete, and the discharge of pernicious gas is reduced, it is good for the environment.
Water-reducing agent is poured into 3.38kg water again, water temperature is controlled in the range of 5~35 DEG C, water-reducing agent is sufficiently scatter Afterwards, then it is poured into mixer and stirs 2 minutes, during concrete for making, adds high-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate is 30%, water-reducing agent additive amount is water, cement, flyash, river sand, the 0.03%~0.3% of gross mass, is chosen in the present embodiment 0.055%, the effect of water-reducing agent is increase hydration efficiency, reduces unit consumption of water, increases intensity, saves cement consumption and improvement The workability of the concrete of ot-yet-hardened, prevents the isolation of concrete composition, improves impermeability, diminishing water penetration, avoids coagulation The leak of civil engineering building structure and concrete component crack, improve frost resistance, are conducive to winter construction.
PVA fiber 234g will be finally weighed, PVA the fibre diameter D=0.031mm, density 1300kg/m used3, draw It is 1600MPa to stretch intensity, Young's modulus >=380GPa.PVA brands are used in practical application as Kuraray, PVA fibers Volume is the 1%-3% of volume of concrete, and it is optimal to choose 2% in practical application, can improve concrete to greatest extent and prolong Property, selected percentage is using water, cement, flyash, sand cumulative volume after mixing as radix, is stirred for after adding fiber 4 minutes, up to the Desert Sand PVA fiber high performance concretes, PVA fibers must be uniformly dispersed in material, to play The toughness of PVA fibers, slowly adds the PVA fiber process to gradation during batting shape is stirred for is presented in whipping process Enter, make PVA fibers dispersed in the material, improve the ductility of PVA fiber concretes.
Manufacture craft of the present invention is sketched：
S1:Cement, river sand and Desert Sand will be weighed to pour into mixer, stirred 1 minute, then will be weighed flyash and pour into Stirred 2 minutes in mixer；
S2:Water-reducing agent is poured into water to the water-reducing agent weighed and water after its water-reducing agent is sufficiently scatter, water temperature control System is in the range of 5~35 DEG C, then is poured into mixer and stirs 2 minutes；
S3:After the addition of PVA fibers will be weighed, after stirring 4 minutes, up to the Desert Sand PVA fibers high-performance coagulation Soil, PVA fibers must be uniformly dispersed in material, in whipping process that the PVA is fine to play the toughness of PVA fibers Dimension is machined to present during batting shape is stirred for and is slowly added to by several times, makes PVA fibers dispersed in the material, improves PVA The ductility of fiber concrete.
The examination that three block sizes are 70.7mm × 70.7mm × 70.7mm is made with the material and manufacture craft of embodiment one Block, to the test block of compressive property, test block makes form removal after 1d, after conserving 7d and 28d respectively.It is 100mm to make three block sizes The test block of × 100mm × 100mm makes the examination that three block sizes are 100mm × 100mm × 100mm to measure Split-tension of Rolled performance For block to measure Split-tension of Rolled performance, test block makes form removal after 1d, conserves foundation GB/T50081 1 after 7d and 28d respectively 《Standard for test methods of mechanical properties of ordinary concrete》Carry out compression strength and tensile splitting strength carries out data statistics.
To the examination prepared by quality of materials proportioning in embodiment one and the PVA fiber high performance concretes obtained by preparation method The resistance to compression of block and Split-tension of Rolled data are tested, and test result is (being shown in Table one)：
Table one
With reference to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》, the data obtained meets standard Requirement.
Embodiment two：
The composition of concrete is water, cement, flyash, sand, wherein, by mass percentage, water：Cement：Flyash：Sand =1：1.875：1.25：1.125, the sand implemented in two is river sand and Desert Sand, mass ratio 0.9:0.1, weigh respectively cement, River sand, Desert Sand weight are 6.34kg, 3.43kg, 0.38kg, are poured into mixer, are stirred 1 minute；Huanghe water can be chosen River sand is washed, its diameter Dmax=1.18mm, the regional Desert Sand such as Desert Sand is optional to rise in lattice, Gansu, Ningxia, Yulin, choosing A diameter of 0.238mm is averaged, cement uses 42.5 Portland cements of P.O.
Secondly the flyash 4.23kg weighed is poured into mixer and stirred 2 minutes, coal dust ash is I grade of flyash, is Plant wastes, substitute 40% cement.
Water-reducing agent 10g is poured into 3.38kg water again, water temperature is controlled in the range of 5~35 DEG C, water-reducing agent is sufficiently divided After scattering, then it is poured into mixer and stirs 2 minutes, during concrete for making, adds high-efficiency water-reducing agent of poly-carboxylic acid, diminishing Rate is 30%, and water-reducing agent additive amount is water, cement, flyash, river sand, the 0.03%~0.3% of gross mass, is selected in the present embodiment 0.055% is taken, the effect of water-reducing agent is increase hydration efficiency, reduces unit consumption of water, increases intensity etc..
PVA fiber 234g will be finally weighed, PVA the fibre diameter D=0.031mm, density 1300kg/m used3, draw It is 1600MPa to stretch intensity, Young's modulus >=380GPa, and PVA brands are used as Kuraray in practical application, PVA fibers Volume is the 1%-3% of volume of concrete, and it is optimal to choose 2% in practical application, can improve concrete to greatest extent and prolong Property, selected percentage is using water, cement, flyash, sand cumulative volume after mixing as radix, is stirred for after adding fiber 4 minutes, up to the Desert Sand PVA fiber high performance concretes, PVA fibers must be uniformly dispersed in material, to play The toughness of PVA fibers, slowly adds the PVA fiber process to gradation during batting shape is stirred for is presented in whipping process Enter, make PVA fibers dispersed in the material, improve the ductility of PVA fiber concretes.
Manufacture craft of the present invention is sketched：
S1:Cement, river sand and Desert Sand will be weighed in proportion to pour into mixer, be stirred 1 minute, then will be weighed fine coal Ash is poured into mixer and stirred 2 minutes；
S2:The water-reducing agent and water weighed in proportion, water-reducing agent is poured into water after its water-reducing agent is sufficiently scatter, then It is poured into mixer and stirs 2 minutes；
S3:After the addition of PVA fibers will be weighed in proportion, after stirring 4 minutes, up to the high property of the Desert Sand PVA fibers Can concrete.
Optionally, S2 coolant-temperature gages are 5~35 DEG C；
Optionally, in S3, PVA fibers must be uniformly dispersed in material, to play the toughness of PVA fibers, stirred During by the PVA fiber process to present batting shape be stirred for during be slowly added to by several times, make PVA fibers dispersed In the material, the ductility of PVA fiber concretes is improved.
The examination that three block sizes are 70.7mm × 70.7mm × 70.7mm is made with the material and manufacture craft of embodiment two Block, to the test block of compressive property, test block makes form removal after 1d, after conserving 7d and 28d respectively.It is 100mm to make three block sizes To measure Split-tension of Rolled performance, test block makes form removal after 1d for the test block of × 100mm × 100mm, conserve respectively after 7d and 28d according to According to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》Carry out compression strength and tensile splitting strength into Line number is according to statistics.
To the resistance to compression of test block prepared by the PVA fiber high performance concretes that prepare in aforementioned manners and Split-tension of Rolled data into Row test, test result is (being shown in Table two)：
Table two
With reference to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》, the data obtained meets standard Requirement.
Embodiment three：
The composition of concrete is water, cement, flyash, sand, wherein, by mass percentage, water：Cement：Flyash：Sand =1：1.875：1.25：1.125, the sand implemented in two is river sand and Desert Sand, mass ratio 0.8:0.2, weigh respectively cement, River sand, Desert Sand weight are 6.34kg, 3.05kg, 0.76kg, are poured into mixer, are stirred 1 minute；Huanghe water can be chosen River sand is washed, its diameter Dmax=1.18mm, the regional Desert Sand such as Desert Sand is optional to rise in lattice, Gansu, Ningxia, Yulin, choosing A diameter of 0.238mm is averaged, cement uses 42.5 Portland cements of P.O.
Secondly the flyash 4.23kg weighed to be poured into mixer and stirred 2 minutes, coal dust ash is I grade of flyash, and Substitute 40% cement consumption.
Water-reducing agent 10g is poured into 3.38kg water again, water temperature is controlled in the range of 5~35 DEG C, water-reducing agent is sufficiently divided After scattering, then it is poured into mixer and stirs 2 minutes, during concrete for making, adds high-efficiency water-reducing agent of poly-carboxylic acid, diminishing Rate is 30%, and water-reducing agent additive amount is water, cement, flyash, river sand, the 0.03%~0.3% of gross mass, is selected in the present embodiment 0.055% is taken, the effect of water-reducing agent is increase hydration efficiency, reduces unit consumption of water, increases intensity etc..
PVA fiber 234g will be finally weighed, PVA the fibre diameter D=0.031mm, density 1300kg/m used3, draw It is 1600MPa to stretch intensity, Young's modulus >=380GPa, and PVA brands are used as Kuraray in practical application, PVA fibers Volume is the 1%-3% of volume of concrete, and it is optimal to choose 2% in practical application, can improve concrete to greatest extent and prolong Property, selected percentage is using water, cement, flyash, sand cumulative volume after mixing as radix, is stirred for after adding fiber 4 minutes, up to the Desert Sand PVA fiber high performance concretes, PVA fibers must be uniformly dispersed in material, to play The toughness of PVA fibers, slowly adds the PVA fiber process to gradation during batting shape is stirred for is presented in whipping process Enter, make PVA fibers dispersed in the material, improve the ductility of PVA fiber concretes.
The manufacture craft of embodiment three is the same as embodiment two.
The examination that three block sizes are 70.7mm × 70.7mm × 70.7mm is made with the material and manufacture craft of embodiment three Block, to the test block of compressive property, test block makes form removal after 1d, after conserving 7d and 28d respectively.It is 100mm to make three block sizes To measure Split-tension of Rolled performance, test block makes form removal after 1d for the test block of × 100mm × 100mm, conserve respectively after 7d and 28d according to According to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》Carry out compression strength and tensile splitting strength into Line number is according to statistics.
To the resistance to compression of test block prepared by the PVA fiber high performance concretes that prepare in aforementioned manners and Split-tension of Rolled data into Row test, test result is (being shown in Table three)：
Table three
With reference to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》, the data obtained meets standard Requirement, and indices are apparently higher than the data in embodiment one.
Example IV：
River sand
The composition of concrete is water, cement, flyash, sand, wherein, by mass percentage, water：Cement：Flyash：Sand =1：1.875：1.25：1.125, the sand implemented in two is river sand and Desert Sand, mass ratio 0.7:0.3, weigh respectively cement, River sand, Desert Sand weight are 6.34kg, 2.67kg, 1.14kg, are poured into mixer, are stirred 1 minute,；Huanghe water can be chosen River sand is washed, its diameter Dmax=1.18mm, the regional Desert Sand such as Desert Sand is optional to rise in lattice, Gansu, Ningxia, Yulin, choosing A diameter of 0.238mm is averaged, cement uses 42.5 Portland cements of P.O.
Secondly the flyash 4.23kg weighed is poured into mixer and stirred 2 minutes, coal dust ash is I grade of flyash, is replaced The cement consumption in generation 40%.
Water-reducing agent 10g is poured into 3.38kg water again, water temperature is controlled in the range of 5~35 DEG C, water-reducing agent is sufficiently divided After scattering, then it is poured into mixer and stirs 2 minutes, during concrete for making, adds high-efficiency water-reducing agent of poly-carboxylic acid, diminishing Rate is 30%, and water-reducing agent additive amount is water, cement, flyash, river sand, the 0.03%~0.3% of gross mass, is selected in the present embodiment 0.055% is taken, the effect of water-reducing agent is increase hydration efficiency, reduces unit consumption of water, increases intensity etc..
PVA fiber 234g will be finally weighed, use PVA fibers, its diameter D=0.031mm, density 1300kg/m3, Intensity is 1600MPa, Young's modulus >=380GPa, and PVA brands are used in practical application, and for Kuraray, PVA fibers are mixed Amount is the 1%-3% of volume of concrete, and it is optimal to choose 2% in practical application, can improve concrete ductility, institute to greatest extent The percentage of choosing is using water, cement, flyash, sand cumulative volume after mixing as radix, and 4 points are stirred for after adding fiber Clock, up to the Desert Sand PVA fiber high performance concretes, PVA fibers must be uniformly dispersed in material, to play PVA The toughness of fiber, is slowly added to by several times during the PVA fiber process is stirred for presentation batting shape in whipping process, Make PVA fibers dispersed in the material, improve the ductility of PVA fiber concretes.
The manufacture craft of example IV is the same as embodiment two.
The examination that three block sizes are 70.7mm × 70.7mm × 70.7mm is made with the material and manufacture craft of example IV Block, to the test block of compressive property, test block makes form removal after 1d, after conserving 7d and 28d respectively.It is 100mm to make three block sizes To measure Split-tension of Rolled performance, test block makes form removal after 1d for the test block of × 100mm × 100mm, conserve respectively after 7d and 28d according to According to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》Carry out compression strength and tensile splitting strength into Line number is according to statistics.
To the resistance to compression of test block prepared by the PVA fiber high performance concretes that prepare in aforementioned manners and Split-tension of Rolled data into Row test, test result is (being shown in Table four)：
Table four
With reference to GB/T50081 1《Standard for test methods of mechanical properties of ordinary concrete》, the data obtained meets standard Requirement, and indices are substantially higher than the data in embodiment one.
Using the PVA fiber high performance concretes obtained by production method of the present invention, four embodiments contrast to more than, see Table (five)：
Table five
In above-described embodiment one, two, three, four in addition to the quality of river sand and Desert Sand is scaled, wherein embodiment two, 3rd, four river sands and Desert Sand mass ratio are 0.9~0.7：0.1~0.3, the numerical value selected by remaining its material is equal, fine coal Grey volume is the 40% of cement consumption.
Table five can be seen that 7d, 28d compression strength most preferably embodiment three；7d tensile splitting strengths are most preferably implemented Example four, 28d tensile splitting strengths most preferably embodiment three, since embodiment three and example IV are on 7d tensile splitting strengths 0.06MPa is differed, difference is trickle, and 2.96MPa is differed in 7d compression strength, and difference is larger, therefore, when selected river sand It is 0.8 with Desert Sand mass ratio：When 0.2, properties are best, are optimal case.
More than in four embodiments, by experiment can proper Desert Sand PVA fiber high performance concretes mass ratio be water： Cement：Flyash：River sand：Desert Sand is 1：1.875：1.25：1.125, Desert Sand substitution rate is 20%, and the volume of flyash is The volume of 40%, PVA are 2% (test block volume), and the volume of water-reducing agent is 0.055%, and the performance of concrete is best at this time.
The foregoing is merely being preferable to carry out thirty years of age for the present invention, it is not intended to limit the invention, to those skilled in the art For, the invention may be variously modified and varied.On the basic principle of the present invention, any modification for being made, equivalent substitution, Improve etc., it should all fall under the scope of the present invention.

Claims (9)

  1. A kind of 1. Desert Sand PVA fiber high performance concretes, it is characterised in that：The composition of the high performance concrete is water, water Mud, flyash, sand, the sand are made of river sand and Desert Sand, its mass ratio is (0.9~0.7):(0.1~0.3), wherein, press Mass percent meter, water：Cement：Flyash：Sand=1：1.875：1.25：1.125；It is equal with water, cement, flyash, sand mixing Cumulative volume after even is radix, and the volume of PVA fibers is the 2% of volume of concrete.
  2. 2. Desert Sand PVA fiber high performance concretes as claimed in claim 1, it is characterised in that：The cement P.O 42.5 is general Logical portland cement, the flyash is I grade of flyash.
  3. 3. Desert Sand PVA fiber high performance concretes as claimed in claim 1, it is characterised in that：It is added with the concrete Water-reducing rate is 30% high performance water reducing agent of polyocarboxy acid, and the water-reducing agent additive amount is the water, cement, flyash, river sand, total matter The 0.03%~0.3% of amount.
  4. 4. Desert Sand PVA fiber high performance concretes as claimed in claim 3, it is characterised in that：The PVA fibers are high-strength height Mould polyethanol fiber, its diameter D=0.031mm, density 1300kg/, intensity 1600MPa, Young's modulus >=380GPa.
  5. 5. Desert Sand PVA fiber high performance concretes as claimed in claim 4, it is characterised in that：The river sand is washing river sand, Its diameter Dmax=1.18mm, the Desert Sand average diameter are 0.238mm.
  6. 6. the Desert Sand PVA fiber high performance concretes as described in claim 1 to 5 any one, it is characterised in that：The river sand Mass ratio with Desert Sand is 0.9:0.1 or 0.8:0.2 or 0.7:0.3.
  7. 7. a kind of Desert Sand PVA fiber high performance concrete preparation methods as described in claim 1 to 5 any one, it is special Sign is, comprises the following steps：
    S1:Cement, river sand and Desert Sand will be weighed in proportion to pour into mixer, be stirred 1 minute, then will be weighed flyash and fall Enter in mixer and stir 2 minutes；
    S2:The water-reducing agent and water weighed in proportion, water-reducing agent is poured into water after its water-reducing agent is sufficiently scatter, then by its Pour into mixer and stir 2 minutes；
    S3:After the addition of PVA fibers will be weighed in proportion, after stirring 4 minutes, mixed up to the Desert Sand PVA fiber high-performance Solidifying soil.
  8. 8. Desert Sand PVA fibers high performance concrete preparation method as claimed in claim 6, it is characterised in that：S2 coolant-temperature gages For 5~35 DEG C.
  9. 9. Desert Sand PVA fibers high performance concrete preparation method as claimed in claim 7, it is characterised in that：In S3, PVA Fiber must be uniformly dispersed in material, to play the toughness of PVA fibers, by the PVA fiber process in whipping process It is slowly added to by several times to presenting during batting shape is stirred for, makes PVA fibers dispersed in the material, is improved PVA fibers and mix Coagulate the ductility of soil.
CN201711245538.9A 2017-12-01 2017-12-01 A kind of Desert Sand PVA fiber high performance concretes Pending CN107915444A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111606734A (en) * 2019-08-30 2020-09-01 北新集团建材股份有限公司 Negative oxygen ion functional gypsum board and preparation method thereof
CN112250375A (en) * 2020-07-28 2021-01-22 福州大学 Desert sand concrete and desert sand concrete combined column
CN114751687A (en) * 2022-05-31 2022-07-15 河海大学 Fiber composite modified desert sand reinforced cement mortar and preparation method thereof
CN115057675A (en) * 2022-05-31 2022-09-16 西安石油大学 Fiber-reinforced phase-change energy storage concrete and preparation method thereof
CN115925444A (en) * 2022-12-13 2023-04-07 中国电建集团贵阳勘测设计研究院有限公司 Saline desert sand foam concrete and preparation method thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111606734A (en) * 2019-08-30 2020-09-01 北新集团建材股份有限公司 Negative oxygen ion functional gypsum board and preparation method thereof
CN111606734B (en) * 2019-08-30 2022-04-19 北新集团建材股份有限公司 Negative oxygen ion functional gypsum board and preparation method thereof
CN112250375A (en) * 2020-07-28 2021-01-22 福州大学 Desert sand concrete and desert sand concrete combined column
CN114751687A (en) * 2022-05-31 2022-07-15 河海大学 Fiber composite modified desert sand reinforced cement mortar and preparation method thereof
CN115057675A (en) * 2022-05-31 2022-09-16 西安石油大学 Fiber-reinforced phase-change energy storage concrete and preparation method thereof
CN114751687B (en) * 2022-05-31 2022-09-30 河海大学 Fiber composite modified desert sand reinforced cement mortar and preparation method thereof
CN115925444A (en) * 2022-12-13 2023-04-07 中国电建集团贵阳勘测设计研究院有限公司 Saline desert sand foam concrete and preparation method thereof
CN115925444B (en) * 2022-12-13 2023-10-13 中国电建集团贵阳勘测设计研究院有限公司 Salt water desert sand foam concrete and preparation method thereof

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Application publication date: 20180417