CN106316248B - A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp - Google Patents

A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp Download PDF

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CN106316248B
CN106316248B CN201610657587.2A CN201610657587A CN106316248B CN 106316248 B CN106316248 B CN 106316248B CN 201610657587 A CN201610657587 A CN 201610657587A CN 106316248 B CN106316248 B CN 106316248B
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parts
mixing plant
plant waste
waste pulp
concrete
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CN106316248A (en
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杜时贵
何智海
雍睿
黄曼
刘闯
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Shanglin Forest Fuel Construction Materials Co ltd
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University of Shaoxing
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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
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • 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)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Abstract

A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp, in parts by weight, it is made of 80-92 parts of 300-340 parts of cement, 90-130 parts of lithium slag, 70-110 parts of concrete mixing plant waste pulp, 696-739 parts of river sand, 1044-1109 parts of rubble, 8.5-10 parts of economization agent, 4-6 parts of water-reducing agent and water mixing.Low self-shrinking value≤80 × 10 self-constriction high-strength concrete 7d prepared using concrete mixing plant waste pulp‑6, self-shrinking value≤100 × 10 28d‑6, and tend towards stability.The components such as lithium slag and economization agent of the present invention all advantageously reduce self-constriction, preferable with waste pulp compatibility, for reducing self-constriction, action function is different, over-superimposed effect can be achieved, the self-constriction of the high-strength concrete of concrete mixing plant waste pulp preparation is effectively reduced.

Description

A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp
Technical field
The invention belongs to the field of building materials, are specifically related to a kind of low self-constriction high-strength concrete (C60 or more), can The self-constriction of the high-strength concrete using the preparation of concrete mixing plant waste pulp is effectively reduced.
Background technique
Concrete material is still the construction material that usage amount is maximum, using face is most wide, predominantly concrete mixing plant at present Preparation production, inevitably results from a large amount of waste water, waste pulp and waste residue.According to statistics, with the continuous expansion of infrastructure scale Greatly, concrete annual output in China's has been more than 1,500,000,000 m3, and every production 1m3Concrete averagely generates 0.03 ton of waste water, it means that The Concrete Mixing Station in China will generate about 0.5 hundred million tons of waste water every year, contain a certain amount of cement components in waste water, Generally there are strong basicity (pH value is up to 13 or more), be directly discharged in the natural environment of periphery, be to cementitious material and water resource One kind greatly wastes, more importantly huge environmental pollution can be brought, such as pollutes clean underground water source, in waste water Solid particle siltation blocking sewer, forms new waste residue etc., greatly influences holding for concrete mixing plant enterprise after hardening Supervention exhibition.
How effectively to dispose these waste water is that current concrete mixing plant enterprise is concerned about and intractable one of thing the most.? Some researches show that can be used to concrete mixing plant waste water to prepare concrete, and applied in some Practical Projects.For The utilization efficiency for improving concrete mixing plant waste water carries out stratified sedimentation to waste water, waste pulp is formed, around concrete mixing plant Waste pulp prepare concrete and have carried out many work, achieve a series of beneficial achievements, and prepare strong concrete (C60 Or more).With continuing deeply for correlative study, the high-strength concrete of concrete mixing plant waste pulp preparation also shows some bright Aobvious technological deficiency, such as self-constriction are excessive, easily cause high-strength concrete early-age crack, significantly limit the use of its engineering Range.
Concrete self-shrinkage refer to concrete under air-proof condition because of linear deformation caused by internal self-desiccation, in low water It is become apparent in the case of glue ratio, has essential distinction with concrete drying shrinkage.Concrete self-shrinkage has become high-strength concrete Principal mode in contraction distortion.The larger reason of the high-strength concrete self-constriction of concrete mixing plant waste pulp preparation, mainly exists Higher in the pH value of waste pulp, higher alkaline environment certainly will increase concrete self-shrinkage, simultaneously because waste pulp active effect is lower, High-strength concrete is prepared for guarantee, dosage is generally large, gel material content is thereby increased, to increase high-strength coagulation Native self-constriction.Merely using the technology for reducing normal concrete self-constriction, economization agent and swelling agent are such as simply mixed, it is difficult to The excessive technical problem of the high-strength concrete self-constriction of concrete mixing plant waste pulp preparation is effectively solved, particularity is: one Aspect, the solid concentration in waste pulp add cement and mineral admixture dosage, cause its gelling when preparing high-strength concrete Material utilization amount is larger, certainly will increase self-constriction；On the one hand, many anion, cation and some remaining are contained in waste pulp Additive, ion component is complicated, some are conducive to increase self-constriction, some advantageously reduce self-constriction, it is even more important that by This relatively high alkalinity environmental benefits generated is in increase self-constriction.In the case of solving low water binder ratio, concrete mixing plant waste pulp system The excessive technical problem of standby high-strength concrete self-constriction, it is necessary to it is for statistical analysis to its ion component, it finds out compatible The preferable additive of property and mineral admixture, and reduce gel material content.It solves to this problem to stir in existing concrete It mixes and is had not been reported in the concrete of station waste pulp preparation.
Summary of the invention
In order to overcome the higher deficiency of self-constriction for having the high-strength concrete using the preparation of concrete mixing plant waste pulp, this hair It is bright that a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp that self-constriction is effectively reduced is provided.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp, in parts by weight, by cement 300-340 parts, 90-130 parts of lithium slag, 70-110 parts of concrete mixing plant waste pulp, 696-739 parts of river sand, rubble 1044-1109 Part, 8.5-10 parts of economization agent, 4-6 parts of water-reducing agent and 80-92 parts of mixing compositions of water.
Further, decrement agent solution is applied after demoulding in one day outside.
Preferably, the Al of the lithium slag2O3And SiO2The sum of mass fraction > 75%, SO3Mass fraction > 7.5%, than Surface area >=450m2/kg。
Further, the concrete mixing plant waste pulp are concrete mixing plant waste water through precipitating, moisture content For 45%-50%, generation time is within 24 hours.
Further, the cement is PI52.5 cement.
The river sand fineness modulus is 2.4-3.0, and grain composition is 2nd area, and clay content is less than 0.4%.
The continuous grading of the 5~20mm of ballast grain sizes, elongated particles are less than the 3% of rubble gross mass, contain mud Amount is less than 0.3%.
The water-reducing agent is polycarboxylate water-reducer, solid content >=26%.
Economization agent 28d compressive strength rate >=105%, 28d decrement >=40%.
When outer painting, the economization agent concentration is 50%.
Technical concept of the invention are as follows: the generation time that the present invention uses is within 24 hours, moisture content 45%-50% Concrete mixing plant waste pulp, since generation time is short, solid-phase component still has certain active effect, high-strength mixed preparing When solidifying soil, waste pulp dosage can be suitably reduced, realizes that waste pulp high value added utilization is conducive to drop to reduce gel material content Low self-constriction；Economization agent and lithium slag in waste pulp ion and residual component compatibility it is preferable, for reducing self-constriction, make diligent It can be different, it can be achieved that over-superimposed effect；Lithium slag passes through its active effect while improving concrete inner structure, SO3(with SO4 2-Form presence), in alkaline environment with active Al2O3(or CA3) reaction generation dilatancy product entringite, Micro-expansibility can compensate for concrete self-shrinkage, play the role of " swelling agent ", which is also that the exclusive technology of lithium slag is special Point；Studies have shown that it is the effective technology measure for reducing concrete self-shrinkage that interior blending, which applies economization agent all outside, it is applied outside, even more The consistency problem for avoiding economization agent and waste pulp reduces to admixing to apply outside in the concrete of concrete mixing plant waste pulp preparation Agent, the effect of can maximumlly realizing economization agent, so that the high-strength concrete of concrete mixing plant waste pulp preparation be effectively reduced Self-constriction.
Beneficial effects of the present invention are mainly manifested in: self-constriction is effectively reduced.
Specific embodiment
The invention will be further described below.
A kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp, in parts by weight, by cement 300-340 parts, 90-130 parts of lithium slag, 70-110 parts of concrete mixing plant waste pulp, 696-739 parts of river sand, rubble 1044-1109 Part, 8.5-10 parts of economization agent, 4-6 parts of water-reducing agent and 80-92 parts of mixing compositions of water.
Further, decrement agent solution is applied after demoulding in one day outside.
Preferably, the Al of lithium slag2O3And SiO2The sum of mass fraction > 75%, SO3Mass fraction > 7.5%, specific surface area ≥450m2/kg；Concrete mixing plant waste pulp are concrete mixing plant waste water through precipitating, moisture content 45%-50%, Generation time is within 24 hours；River sand fineness modulus is 2.4-3.0, and grain composition is 2nd area, and clay content is less than 0.4%；Cement For PI52.5 cement；The continuous grading of 5~20mm of ballast grain sizes, elongated particles are less than the 3% of rubble gross mass, contain mud Amount is less than 0.3%；Water-reducing agent is polycarboxylate water-reducer, solid content >=26%；Economization agent 28d compressive strength rate >=105%, Its concentration when outer painting, is adjusted to 50% by 28d decrement >=40%.
It is described using concrete mixing plant waste pulp preparation low self-constriction high-strength concrete the preparation method comprises the following steps: by cement, Lithium slag, river sand and rubble stirring (30 seconds), are then added concrete mixing plant waste pulp and water stirring (40 seconds), add economization agent (60 seconds or more) are stirred with water-reducing agent, standard curing room is put into after molding and is conserved, agent solution is reduced in demoulding after 1 day, outer painting ?.
Low self-shrinking value≤80 self-constriction high-strength concrete 7d of the acquisition prepared using concrete mixing plant waste pulp ×10-6, self-shrinking value≤100 × 10 28d-6, and tend towards stability.
Based on above-mentioned formula, the dosage for adjusting different component obtains embodiment 1-3, and detects its different larval instar respectively from receipts Contracting.
Embodiment 1:
Calculation by weight, including 340 parts of cement, 130 parts of lithium slag, 110 parts of concrete mixing plant waste pulp, river sand 696 Part, 1044 parts of rubble, 10 parts of economization agent, 6 parts of water-reducing agent and 80 parts of water, mixing composition apply decrement agent solution outside after demoulding in one day.
The High Strength Concrete Under Compressive Cyclic Loading intensity of 28d concrete mixing plant waste pulp preparation is 81.5MPa, and different larval instar self-constriction is shown in Table 1.
Embodiment 2:
Calculation by weight, including 330 parts of cement, 100 parts of lithium slag, 100 parts of concrete mixing plant waste pulp, river sand 714 Part, 1071 parts of rubble, 9 parts of economization agent, 5 parts of water-reducing agent and 85 parts of water, mixing composition apply decrement agent solution outside after demoulding in one day.
The High Strength Concrete Under Compressive Cyclic Loading intensity of 28d concrete mixing plant waste pulp preparation is 74.7MPa, and different larval instar self-constriction is shown in Table 1.
Embodiment 3:
Calculation by weight, including 300 parts of cement, 90 parts of lithium slag, 70 parts of concrete mixing plant waste pulp, 739 parts of river sand, 1109 parts of rubble, 8.5 parts of economization agent, 4 parts of water-reducing agent and 92 parts of water, mixing composition apply decrement agent solution outside after demoulding in one day.
The High Strength Concrete Under Compressive Cyclic Loading intensity of 28d concrete mixing plant waste pulp preparation is 62.2MPa, and different larval instar self-constriction is shown in Table 1, table 1 are the self-shrinking value (× 10 of the low self-constriction high-strength concrete different larval instar prepared using concrete mixing plant waste pulp-6)
Table 1.

Claims (8)

1. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp, it is characterised in that: according to parts by weight Meter, by 300-340 parts of cement, 90-130 parts of lithium slag, 70-110 parts of concrete mixing plant waste pulp, 696-739 parts of river sand, rubble 1044-1109 parts, 80-92 parts of 8.5-10 parts of economization agent, 4-6 parts of water-reducing agent and water mixing compositions；Decrement is applied after demoulding in one day outside Agent solution；The concrete mixing plant waste pulp are concrete mixing plant waste water through precipitating, moisture content 45%- 50%, generation time is within 24 hours.
2. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: the Al of the lithium slag2O3And SiO2The sum of mass fraction > 75%, SO3Mass fraction > 7.5%, specific surface area >= 450m2/kg。
3. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: the cement is PI52.5 cement.
4. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: the river sand fineness modulus is 2.4-3.0, and grain composition is 2nd area, and clay content is less than 0.4%.
5. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: the continuous grading of the 5~20mm of ballast grain sizes, and elongated particles are less than the 3% of rubble gross mass, clay content Less than 0.3%.
6. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: the water-reducing agent is polycarboxylate water-reducer, solid content >=26%.
7. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: economization agent 28d compressive strength rate >=105%, 28d decrement >=40%.
8. a kind of low self-constriction high-strength concrete prepared using concrete mixing plant waste pulp as described in claim 1, special Sign is: when applying outside, the economization agent concentration is 50%.
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CN107298560A (en) * 2017-06-25 2017-10-27 长沙善道新材料科技有限公司 A kind of anti-permeation cracking-resistant concrete
CN108892427A (en) * 2018-08-07 2018-11-27 深圳市为海建材有限公司 A kind of solid waste is non-burning brick and preparation method thereof
CN109987913A (en) * 2019-04-10 2019-07-09 青铜峡市恒源砼业有限公司 A kind of environment-friendly type wet mixing mortar
CN110922147B (en) * 2019-10-29 2021-12-28 江苏盐砼新材料科技有限公司 Tail slurry autoclaved aerated concrete block and preparation method thereof
CN113402196B (en) * 2021-06-23 2022-09-20 济南方圣混凝土构件有限公司 Method for preparing ultra-high performance concrete admixture by using concrete waste slurry

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Effective date of registration: 20200722

Address after: 530500 the campus of Chengtai Township No.2 Middle School, Chengtai Township, Shanglin County, Nanning City, Guangxi Zhuang Autonomous Region

Patentee after: Shanglin forest fuel construction materials Co.,Ltd.

Address before: 312000, No. 508 West Ring Road, Yuecheng District, Zhejiang, Shaoxing

Patentee before: SHAOXING University