CN102775100B - Convenient and fast construction type active powder concrete mixed superfine cement - Google Patents
Convenient and fast construction type active powder concrete mixed superfine cement Download PDFInfo
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- CN102775100B CN102775100B CN201210266936.XA CN201210266936A CN102775100B CN 102775100 B CN102775100 B CN 102775100B CN 201210266936 A CN201210266936 A CN 201210266936A CN 102775100 B CN102775100 B CN 102775100B
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Abstract
The invention relates to convenient and fast construction type active powder concrete for superfine cement mixed construction and belongs to the technical field of cement. The convenient and fast construction type active powder concrete comprises the raw material ingredients including superfine cement, sand, water and water reducing agents according to a proportioning rate being 1:(0.7-1.5):(0.14-0.2):(0.01-0.05) through being calculated by weight, wherein the superfine cement is prepared by using normal cement or cement clinker as raw materials through being ground to the specified fineness, and the specific surface area of the superfine cement is greater than 500m<2>/kg. The convenient and fast construction type active powder concrete has the advantages that the intensity increment speed of the active powder concrete can be accelerated, and the active powder concrete can get rid of the dependence on silica powder.
Description
Technical field
The present invention relates to a kind of RPC, relate in particular to a kind of construction portable type RPC of mixing superfine cement, belong to concrete technology field.
Technical background
1993, the people such as Richard of France Bouygues company take the poly-close cement (DSP) of superfine granule with macroscopical zero defect cement (MDF) for basic, develop a kind of ultra high performance cementitious---RPC (Reactive Powder Concrete, be called for short RPC), Europe is referred to as ultra-high performance concrete (Ultra High Performance Concrete is called for short UHPC) conventionally now.This material, by components such as reactive powder, cement, fine aggregate, high-intensity fibers, by gradation design optimization, is prepared from through special processes such as High Temperature Curings, is a kind of hi-tech matrix material.
The basic preparation principle of RPC comprises: non-coarse aggregate, and admixture superfine active powder, reduces defect size to greatest extent; Admixture steel fiber, increases toughness; Use high efficiency water reducing agent, reduce water-cement ratio and porosity; High Temperature Curing, the hydration reaction of promotion gelling material.
Compare with high-strength concrete with normal concrete, RPC has excellent physical and mechanical property: the folding strength that has very high ultimate compression strength, excellence, and present considerable tensile property, its high intensity is conducive to reduce dead load and sectional dimension, make full use of the mechanical property of each composition material, reduce material usage; After the fine steel fiber of admixture, can significantly improve folding strength, tensile property and the endergonic ability of RPC, and delay crack occurrence, its ultimate compression strength also has further raising simultaneously; Because RPC interior porosity is very little, fault in material is low, so have good chloride-penetration resistance, anti-carbonization, the weather resistance such as anticorrosive, impervious, freeze proof and wear-resisting; In addition, shock test shows, RPC also has excellent shock resistance.
But also there are some problems in RPC: the preparation of RPC is large to silica flour demand, but China's silica flour scarcity of resources, and silica flour output is limited, is difficult to meet the demand of concrete works; What silica flour participated in is secondary reaction of hydration, and therefore, it is comparatively slow that the intensity of RPC improves speed, and this shows particularly outstanding in the situation that of normal temperature maintenance; The adulterant that RPC is used too much can make process for preparation too loaded down with trivial details, and some adulterant itself exists the problem that moiety fluctuation is large, is unfavorable for the mass-producing application of RPC.
Summary of the invention
The object of the invention is to provide a kind of construction portable type RPC of mixing superfine cement, by preparing RPC with superfine cement and solving its associated problem.The present invention can improve the rate of growth of RPC intensity, and makes RPC break away from the dependence to silica flour, can simplify production, is also easy to control the stability of material.
For achieving the above object, the present invention has taked following technical scheme:
A kind of construction portable type RPC of mixing superfine cement, it is characterized in that: material component comprises superfine cement, sand, water, water reducer, the proportioning that wherein superfine cement, sand, water, water reducer are calculated by weight is 1:(0.7～1.5): (0.14～0.2): (0.01～0.05);
Superfine cement is as a kind of injection material, is that to take Portland cement or cement clinker be raw material, and grinding makes to regulation fineness, and its specific surface area is greater than 500m
2/ kg; Conventionally at 500～1000m
2/ kg is even higher; Existing all kinds of Portland cement specific surface areas are all less than 500m at present
2/ kg.
Described sand is natural sand, artificial sand or quartz sand, and the particle diameter of sand is not more than 5mm, by the consumption of dry sand, calculates; If the sand adopting is damp sand, the weight of water in damp sand should be counted in the consumption of water;
Described water reducer weight does not comprise the weight of water in water reducer, if water reducer contains water, during calculating, water is wherein converted in the consumption of water.
Described water meets the regulation of < < concrete mixing water supply standard > > JGJ 63-89.
Construction portable type RPC of mixing superfine cement of the present invention, can further improve its performance by adding fiber in use, described fiber comprises the various fibers that are applicable to RPC, as steel fiber, fibers content maximum is no more than 6% of RPC volume.
Beneficial effect of the present invention is as follows:
This On New Reactive Powder Concrete adopts superfine cement as superfine active powdery components, compares with the RPC of mixing silica flour, because hydration reaction directly occurs for superfine cement and water, so can improve the rate of growth of RPC intensity.
Superfine cement is easy to produce, and therefore can make RPC break away from the dependence to silica flour, is beneficial to the preparation of RPC.
Using superfine cement need not mix again other adulterant in preparing the process of RPC, thereby reach, simplify the object of producing, be also easier to control the stability of material.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment:
The typical material mix proportion that the present invention adopts, and degree of mobilization and the intensity of corresponding RPC see the following form:
Described superfine cement is ultra-fine silicate cement, and strength grade is 52.5, density 3.07g/cm
3, specific surface area: 568m
2/ kg;
Described sand adopts natural siliceous sand, particle size range 40 order～70 orders;
Described water meets the regulation of < < concrete mixing water supply standard > > JGJ63-89;
Described water reducer main component is polycarboxylate water-reducer;
Described length of steel fiber 8mm, diameter 0.12mm, tensile strength is not less than 2850MPa.
Its making processes is as follows:
Pour in agitator kettle load weighted superfine cement and sand into low rate mixing 1 minute; low rate mixing 2 minutes in 30 seconds, the water mixing and water reducer being poured in agitator kettle again; rapid stirring is low rate mixing shutdown in 1 minute after 3 minutes; if there is fiber to add; in in the end stir slowly 1 minute, fiber is sprinkled in agitator kettle equably, rapid stirring is shut down for 2 minutes more afterwards.The stirrer adopting meets the requirement of the planetary cement mortar mixer > of < < > JC/T681-2005.
Now can carry out degree of mobilization test.Degree of mobilization testing method is undertaken by < < Test method for fluidity of cement mortar > > GB/T2419-2005, but adopts glass plate to replace jumping table to test.
The compound being stirred is poured in the standard die trial of 40mm * 40mm * 160mm by < < Test method for strength of hydraulic cement mortar (ISO method) > > GB/T17671-1999 requirement, on shaking table, after vibratory compaction, move in 20 ± 1 ℃ of relative humidity of temperature and be not less than in 90% maintaining box maintenance 1～2 day, after the demoulding, test block is moved into concrete and accelerate in maintaining box maintenance 2 days, maintaining box temperature is controlled at 90 ± 1 ℃.2860 beats/min of shaking table frequencies, amplitude of vibration 0.3～0.6mm.Concrete accelerates maintaining box and meets the requirement that < < concrete accelerates maintaining box > > JG/T3027-1995.
The complete RPC test block of maintenance requires to carry out compressive strength test according to < < Test method for strength of hydraulic cement mortar (ISO method) > > GB/T17671-1999.
Existing research shows, the RPC that adopts silica flour under the environment of 20 ℃ after maintenance 28d 90 ℃ of vapor cures of compressive strength rate low by 20%～30%.But the proportioning in employing in table is carried out simultaneous test discovery, in the situation that not adopting silica flour, the ultimate compression strength of 20 ℃ of maintenance 28d of material only, than 90 ℃ of low 10% left and right of vapor cure, does not adopt silica flour if prove, under normal temperature, the rate of growth of RPC intensity is able to obvious raising.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. mix the construction portable type RPC of superfine cement, it is characterized in that, its material component is superfine cement, sand, water, water reducer, fiber, and the proportioning that wherein superfine cement, sand, water, water reducer are calculated by weight is 1:(0.7～1.5): (0.14～0.2): (0.01～0.05); Fibers content maximum is no more than 6% of RPC volume;
Superfine cement is that to take Portland cement or cement clinker be raw material, and grinding makes to regulation fineness, and its specific surface area is at 500～1000m
2/ kg.
2. according to construction portable type RPC of mixing superfine cement claimed in claim 1, it is characterized in that, described sand is natural sand, artificial sand or quartz sand, and the particle diameter of sand is not more than 5mm, by the consumption of dry sand, calculates; If the sand adopting is damp sand, the weight of water in damp sand should be counted in the consumption of water.
3. according to construction portable type RPC of mixing superfine cement claimed in claim 1, it is characterized in that, described water reducer weight does not comprise the weight of water in water reducer, if water reducer contains water, during calculating, water is wherein converted in the consumption of water.
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|---|---|---|---|
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| CN201210266936.XA CN102775100B (en) | 2012-07-30 | 2012-07-30 | Convenient and fast construction type active powder concrete mixed superfine cement |
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| CN102775100A CN102775100A (en) | 2012-11-14 |
| CN102775100B true CN102775100B (en) | 2014-04-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289302A (en) * | 2008-06-05 | 2008-10-22 | 北京中铁房山桥梁有限公司 | High-performance concrete material for prestressed component of ballastless track and method for preparing same |
| CN101437773A (en) * | 2006-05-05 | 2009-05-20 | 赢创德固赛有限责任公司 | Pulverulent composition comprising a hydraulic binder and a pyrogenic metal oxide |
| CN102503310A (en) * | 2011-11-07 | 2012-06-20 | 西南交通大学 | Super-high early-strength grouting material for repairing ballastless track structure of high speed railway |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101437773A (en) * | 2006-05-05 | 2009-05-20 | 赢创德固赛有限责任公司 | Pulverulent composition comprising a hydraulic binder and a pyrogenic metal oxide |
| CN101289302A (en) * | 2008-06-05 | 2008-10-22 | 北京中铁房山桥梁有限公司 | High-performance concrete material for prestressed component of ballastless track and method for preparing same |
| CN102503310A (en) * | 2011-11-07 | 2012-06-20 | 西南交通大学 | Super-high early-strength grouting material for repairing ballastless track structure of high speed railway |
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