CN109665778A - A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40 - Google Patents

A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40 Download PDF

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Publication number
CN109665778A
CN109665778A CN201910035209.4A CN201910035209A CN109665778A CN 109665778 A CN109665778 A CN 109665778A CN 201910035209 A CN201910035209 A CN 201910035209A CN 109665778 A CN109665778 A CN 109665778A
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China
Prior art keywords
preparation
concrete
useless brick
brickbat
water
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王晓飞
王鹏飞
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Nanyang Normal University
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Nanyang Normal 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)

Abstract

The invention discloses a kind of preparation methods for the useless brick coarse aggregate regeneration concrete that strength grade is C40, this method comprises the following steps: (1) pretreatment for the brick that gives up: removing cement mortar, the sediment contamination on useless brick surface, it is broken, screening, obtains brickbat of the nominal particle diameter between 5~20mm；(2) it measures according to the ratio and puts into fine aggregate, cement, flyash, silicon ash and high efficiency water reducing agent into blender, after mixing evenly, 30% water of total Water is added, brickbat and rubble are put into again after mortar is sufficiently stirred, continue to be stirred until homogeneous, then remaining water is added, it is uniform to concrete to continue stirring；(3) concrete formation, maintenance.The regeneration concrete prepared using preparation method of the invention is both had reliable intensity, workability and durability, and useless brick is utilized to greatest extent, also protects environment while reducing Cost of Concrete.

Description

A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40
Technical field
The invention belongs to the field of building materials, and in particular to a kind of useless brick coarse aggregate regeneration coagulation that strength grade is C40 The preparation method of soil.
Background technique
China is just locating the novel Urbanization Progress stage at present, and Urbanization Progress will supervene a large amount of building waste, The brick setting material being commonly used especially in farm building.According to statistics, the brick that gives up in the building waste of reconstruction of the old city town accounts for 50%~ 70%, the brick that gives up in the building waste of construction accounts for 30%~50%, if building waste without any processing, just by work order Position transports countryside or rural area, air storage or landfill to, will consume the pork barrels such as a large amount of land acquisition expense, refuse collection expense, Meanwhile it clearing and will cause serious environmental pollution again with the problems such as flying upward with dust, sand-lime of dropping in stacking process.In order to have Effect mitigates environmental pollution caused by building waste and destroys problem, reduces the quantity of waste bricks, accomplishes sustainable and harmonious development, sends out Exhibition is a good approach using useless brick as the regeneration concrete building materials of primary raw material.
However, useless brick has the characteristics that water absorption rate is big, crush values are big, light weight, thick bone is prepared using useless brick Expect and part replaces sandstone aggregate and then prepares resulting regeneration concrete to have that workability is poor, intensity is low, durability is poor etc. scarce Point.The Replacement rate of useless brick coarse aggregate can not be excessively high, and a large number of experiments proves, when Replacement rate is more than 50%, the decline of intensity exists 40% or so.If Replacement rate is too small, the application value of regeneration concrete, economy are little.And brick coarse aggregate is given up at present again The research of growing concrete is limited only to improve its certain performance (such as intensity), or only pursues its economy, and a large amount of even hundred The hundred useless brick fragment of use is divided to replace crushed stone aggregate.
Brickbat has more gap, if be stirred according to the stirring system of current conventional disposable plus water, gives up Brick surface causes large quantity of moisture to be absorbed by useless brick, is unfavorable for the formation of cement slurry because will directly contact with water without thing package And the progress of cement hydration process, cause concrete workability, intensity, durability to reduce.
Summary of the invention
The problem of preparing regeneration concrete using useless brick mentioned in the background art, the purpose of the present invention is to provide A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40.
To achieve the above object, the invention provides the following technical scheme:
A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40, includes the following steps:
(1) pretreatment of useless brick: cement mortar, the sediment contamination on useless brick surface are removed, is crushed, screening obtains nominal grain Brickbat of the diameter between 5~20mm；
(2) fine aggregate, cement, flyash, silicon ash and high efficiency water reducing agent are put into blender, after mixing evenly, are added 30% water of total Water, puts into brickbat and rubble after mortar is sufficiently stirred again, continues to be stirred until homogeneous, and is then added remaining Water, continue stir, the cement, water, brickbat, rubble, fine aggregate, flyash, silicon ash and efficient diminishing uniform to concrete The mass ratio of agent is 315: 185: 410: 616: 513: 90: 45: 6；
(3) concrete formation, maintenance.
Preferably, the useless brick is that compression strength meets the MU10 grade brick of GB 5101-2003, the brickbat it is apparent close Degree is 1610kg/m3, clay content is no more than 0.2%, and clod content is not more than 0.1%, and needle, sheet-like particle content are not more than 0.5%.
Preferably, the cement is ordinary portland cement P.O 42.5.
Preferably, the apparent density of the rubble is 2700kg/m3, nominal particle diameter range is between 5~40mm.
Preferably, the fine aggregate is the middle sand for meeting 2nd area of GB/T 14684-2001 gradation.
Preferably, the flyash is the special fine powdered coal of I grade for meeting GB/T 1596-2005.
Preferably, the apparent density of the silicon ash is 2200kg/m3。
Preferably, the high efficiency water reducing agent is the polycarboxylic-acid standard type high-performance water reducing agent for meeting GB 8076-2008.
The present invention uses improved secondary agitation system to prepare Replacement rate of the brickbat in coarse aggregate as 40% intensity etc. Grade be C40 regeneration concrete, according to " Standard for test methods of properties of ordinary concrete mixture standard " (GB/T 50080-2016), " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2002), " normal concrete long-term behaviour and durability Can test method standard " (GB/T 50082-2009) require the workability to regeneration concrete mixture, 150mm × 150mm × The compression strength of 150mm cube specimen, 150mm × 150mm × 600mm prism flexural strength, φ 100mm × 50mm circle The resistance of chloride ion penetration of column is tested, and is met the requirements.The regeneration concrete prepared using preparation method of the invention, was both had There are reliable intensity, workability and durability, and useless brick is utilized to greatest extent, while reducing Cost of Concrete Also environment is protected.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1
(1) raw material
1. cement
Cement is ordinary portland cement, and strength grade is P.O 42.5, density 3100kg/m3.Through examining, cement is each Item technical indicator meets the requirement of GB 175-2007 " common portland cement quality standard ": specific surface area is not less than 300m2/ Kg, loss on ignition are not more than 5%, SO3Content should be not more than 3.5%, MgO2Content is not more than 5%, and chloride ion content is not more than 0.06%, alkali content is not more than 0.6%, and the presetting period is not less than 45min, and final set is not more than 600min, and intensity is not less than within 3 days 17MPa, intensity is not less than 42.5MPa within 28 days.
Using the preceding compatibility test with the progress of polycarboxylic-acid standard type high-performance water reducing agent between the two, test method is adopted It is final to determine with the method in existing building material industry standard " cement and water reducer compatibility test method " JC/T 1083-2008 The two compatibility is good.
2. fine aggregate
Fine aggregate uses natural river sand, which is middle sand, apparent density 2730kg/m3, clod content 0.1% contains Mud amount 0.6%, fineness modulus 2.7,2nd area of gradation for meeting GB/T 14684-2001 require.Through examining, the quality of sand meets Existing building material industry standard " regular concrete sand, Shi Zhiliang and test method standard " JC/T52-2006 and national standard " are built Build with sand " high-quality sand standard specified in GB/T 14684-2001.
3. coarse aggregate
60% coarse aggregate uses artificial rubble, and quality densification is hard, rough surface, apparent density 2700kg/m3。 Its main component granite and basalt content (in mass) are not less than 90%, and clay content is no more than 1%, and clod content does not surpass 0.5% is crossed, sulfide and sulphates content are no more than 1%.Particle shape is almost spherical, and needle, sheet content are small, nominal particle diameter range Between 5~40mm, continuous grading meets in " regular concrete sand, Shi Zhiliang and test method standard " JGJ 52-2006 The requirement of table 3.2.1-2.
40% coarse aggregate is brickbat regenerated coarse aggregate.Useless brick is selected from certain 1 layer of brick masonry structure house, which is built in 1994.It is examined, the compression strength of useless brick meets as defined in GB 5101-2003 " fired common brick " standard MU10 grades of bricks It is required that.Useless brick is handled in accordance with the following methods, brickbat regenerated coarse aggregate is made:
It the broken pretreatment such as first hammered, sorted to useless brick, then pretreated brickbat is carried out using magnet Magnetic sorting eliminates scrap iron material, and the impurity such as timber, plastics are removed in sorting manually, after the completion of sorting, are further carried out brokenly to brickbat Broken processing, during broken, it should be noted that cement mortar, the silt particle etc. for building useless brick surface wash as far as possible, guarantee material Clean and uniformity, final sizing brickbat removes 5mm brickbat below, the brickbat greater than 20mm continued to be crushed, sieved Divide processing, nominal particle diameter is between 5~20mm and continuous grading meets " regular concrete sand, Shi Zhiliang and inspection for final acquisition Test method standard " the brickbat regenerated coarse aggregate of the requirement of table 3.2.1-2 in JGJ 52-2006
The apparent density of brickbat regenerated coarse aggregate is 1610kg/m3, clay content should be no more than 0.2%, and clod content should not Greater than 0.1%, needle, sheet-like particle content should be not more than 0.5%, and must not be mixed into weathering particle.
4. water
Water is tap water, and quality meets the requirement of national standard " concrete water standard " JGJ 63-2006: pH value is not Less than 4.5, insolubles content is not more than 2000mg/L, and the content of soluble matter is not more than 5000mg/L, Cl-Content is not more than 1000mg/L, SO2-Content is not more than 2000mg/L, and alkali content is not more than 1500rag/L.
5. flyash
Using I grades of special fine powdered coals, density 2400kg/m3.Through examining, flyash all standard meets national standard The requirement of " for the flyash in cement and concrete " GB/T1596-2005: 0.045mm square hole screen, which tails over, to be not more than 10%, loss on ignition is not more than 3%, SO3Content should be not more than 2%, and water content should be not more than 1%, and water demand ratio should be not more than 95%, specific surface area should be greater than 700m2/kg。
6. silicon ash
Its apparent density is 2200kg/m3, quality meets national standard, and " high-strength high-performance concrete mineral are additional Agent " relevant criterions such as GB/T 18736-2002 requirement: loss on ignition is not more than 6%, SO2Content is not less than 85%, and chloride ion contains Amount is not more than 0.02%, and water content is not more than 3%, and specific surface area is not less than 15000m2/ kg, water demand ratio are not more than 125%, Activity index (28d) is not less than 85%.
7. high efficiency water reducing agent
Using polycarboxylic-acid standard type high-performance water reducing agent, apparent density 1070kg/m3, water-reducing rate 32%, chlorine from Sub- content is not more than 0.6%, and sodium sulphate content is not more than 5%, and alkali content is not more than 10%, and content of formaldehyde is not more than 0.05%, Air content is not more than 6%, and for pH value between 6~7, quality meets existing national standards " concrete admixture " GB 8076- The requirement of the relevant criterions such as 2008.
(2) match ratio
Strength grade is that the useless brick coarse aggregate regeneration concrete match ratio of C40 is as shown in table 1.
1 strength grade of table is the useless brick coarse aggregate regeneration concrete match ratio (kg/m of C403)
Cement Water Brickbat Rubble River sand Flyash Silicon ash High efficiency water reducing agent
315 185 410 616 513 90 45 6
(3) stirring technique
By the match ratio of table 1, fine aggregate, cement, flyash, silicon ash and high efficiency water reducing agent are first put into blender, Then 30% water of total Water, 3~4min of uniform stirring is added in 3~4min of even stirring, then put into coarse aggregate (useless brick+broken Stone), 3~4min of uniform stirring then proceedes to that remaining water is added, and it is mixed to obtain useless brick coarse aggregate regeneration by 3~4min of uniform stirring Solidifying soil mixture.
(4) slump measures
Referring to slump consistancy test side in " Standard for test methods of properties of ordinary concrete mixture standard " (GB/T 50080-2016) Method carries out slump measurement to above-mentioned useless brick coarse aggregate regeneration concrete mixture, and slump consistancy test has carried out three times altogether.Three times The slump value of test is respectively as follows: 83mm, 85mm, 79mm, arithmetic mean of instantaneous value 82.3mm.
(5) test specimen makes
Useless brick coarse aggregate regeneration concrete mixture enters mould, and making 3 sizes is 150mm × 150mm × 150mm examination Part is used for compression test, and making 3 sizes is 150mm × 150mm × 600mm test specimen for bending test, makes 3 rulers It is very little to be used for durability test for φ 100mm × 100mm test specimen.
(6) maintenance process
Test specimen stands demoulding after diel in the environment that temperature is 20 ± 5 DEG C, and it is 20 ± 2 that temperature is immediately placed in after demoulding DEG C, relative humidity be 95% or more standard curing box in conserve 28 days.
(7) mechanical property test result
Referring to resistance to compression, bending test in " standard for test methods of mechanical properties of ordinary concrete " (GB/T 50081-2002) Method carries out the measurement of compression strength, flexural strength to useless brick coarse aggregate regeneration concrete test specimen.Compression test and bending test Test specimen quantity is three.
2 compressive strength test result (MPa) of table
Serial number 28 days cubic compressive strengths
1 48.5
2 46.2
3 50.4
Compression strength value by the arithmetic mean of instantaneous value 48.4 of three test specimen measured values in table 2 as this group of test specimen.
3 flexural strength test result (MPa) of table
Serial number 28 days prism flexural strengths
1 4.8
2 5.4
3 5.0
Flexural strength value by the arithmetic mean of instantaneous value 5.1 of three test specimen measured values in table 3 as this group of test specimen.
(8) endurance quality test result
According to RCM in " Standard for test methods of longterm performance and durability of ordinary concrete standard " (GB/T 50082-2009) The resistance of chloride ion penetration of method test regeneration concrete test specimen.Height will be cut from middle part having a size of φ 100mm × 100mm test specimen For 50 ± 2mm cylindrical body as test test specimen.
4 resistance of chloride ion penetration test result of table
Serial number Diffusion coefficient DRCM(10-12m2/s)
1 3.6
2 2.7
3 3.4
By the median 3.4 × 10 in table 4 in three test specimen measured values-12m2Diffusion coefficient value of/the s as this group of test specimen.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention, Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features. All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention Within protection scope.

Claims (9)

1. a kind of strength grade is the preparation method of the useless brick coarse aggregate regeneration concrete of C40, include the following steps:
(1) pretreatment of useless brick: cement mortar, the sediment contamination on useless brick surface are removed, is crushed, screening obtains nominal particle diameter 5 Brickbat between~20mm；
(2) fine aggregate, cement, flyash, silicon ash and high efficiency water reducing agent being put into blender, total water is added after mixing evenly 30% water of amount, puts into brickbat and rubble after mortar is sufficiently stirred again, continues to be stirred until homogeneous, be then added remaining Water continues to stir, the cement, water, brickbat, rubble, fine aggregate, flyash, silicon ash and high efficiency water reducing agent uniform to concrete Mass ratio be 315: 185: 410: 616: 513: 90: 45: 6；
(3) concrete formation, maintenance.
2. preparation method according to claim 1, it is characterised in that: the useless brick is that compression strength meets GB 5101- 2003 MU10 grade brick, the apparent density of the brickbat are 1610kg/m3, no more than 0.2%, clod content is not more than clay content 0.1%, needle, sheet-like particle content are not more than 0.5%.
3. preparation method according to claim 1, it is characterised in that: the cement is ordinary portland cement P.O 42.5。
4. preparation method according to claim 1, it is characterised in that: the apparent density of the rubble is 2700kg/m3, public Claim particle size range between 5~40mm.
5. preparation method according to claim 1, it is characterised in that: the fine aggregate is to meet GB/T14684-2001 grades Middle sand with 2nd area.
6. preparation method according to claim 1, it is characterised in that: the flyash is to meet GB/T 1596-2005 I grades of special fine powdered coals.
7. preparation method according to claim 1, it is characterised in that: the apparent density of the silicon ash is 2200kg/m3。
8. preparation method according to claim 1, it is characterised in that: the high efficiency water reducing agent is to meet GB 8076-2008 Polycarboxylic-acid standard type high-performance water reducing agent.
9. according to concrete component made from any preparation method of claim 1-8.
CN201910035209.4A 2019-01-15 2019-01-15 A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40 Pending CN109665778A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110078446A (en) * 2019-05-13 2019-08-02 福州大学 A kind of steel-PVA assorted fibre regeneration brick aggregate concrete and preparation method thereof
CN112062507A (en) * 2020-09-14 2020-12-11 北京新奥混凝土集团有限公司 Concrete containing recycled waste brick fine aggregate

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CN105036660A (en) * 2015-08-10 2015-11-11 河海大学 C40 recycled aggregate concrete and preparation method thereof
CN108911620A (en) * 2018-06-15 2018-11-30 湖南大学 Aggregate C40 concrete of brick containing recycled sinter and preparation method thereof

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CN104591656A (en) * 2015-02-13 2015-05-06 福建江夏学院 Low-drying shrinkage high-performance recycled concrete
CN105036660A (en) * 2015-08-10 2015-11-11 河海大学 C40 recycled aggregate concrete and preparation method thereof
CN108911620A (en) * 2018-06-15 2018-11-30 湖南大学 Aggregate C40 concrete of brick containing recycled sinter and preparation method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110078446A (en) * 2019-05-13 2019-08-02 福州大学 A kind of steel-PVA assorted fibre regeneration brick aggregate concrete and preparation method thereof
CN112062507A (en) * 2020-09-14 2020-12-11 北京新奥混凝土集团有限公司 Concrete containing recycled waste brick fine aggregate

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