CN107382190A - A kind of low viscosity high flowability C60 super high-rise pumping concrete based on ultra fine sand compounding - Google Patents

A kind of low viscosity high flowability C60 super high-rise pumping concrete based on ultra fine sand compounding Download PDF

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Publication number
CN107382190A
CN107382190A CN201710603735.7A CN201710603735A CN107382190A CN 107382190 A CN107382190 A CN 107382190A CN 201710603735 A CN201710603735 A CN 201710603735A CN 107382190 A CN107382190 A CN 107382190A
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CN
China
Prior art keywords
super
sand
concrete
flowability
ultra fine
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CN201710603735.7A
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Chinese (zh)
Inventor
刘登贤
向鹏
吴鑫
张旭
曾昌洪
桂根生
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Sichuan Huashi Green House Building Materials Co Ltd
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Sichuan Huashi Green House Building Materials Co Ltd
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Priority to CN201710603735.7A priority Critical patent/CN107382190A/en
Publication of CN107382190A publication Critical patent/CN107382190A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00146Sprayable or pumpable mixtures
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a kind of low viscosity high flowability C60 super high-rise pumping concrete based on ultra fine sand compounding;The super high-rise pumping concrete includes cement, miberal powder, flyash, special thin natural sand, Machine-made Sand, rubble, additive and water.Super high-rise pumping concrete of the present invention can be prepared by existing conventional method, the concrete feature is that according to Sichuan-chongqing Region ready-mixed concrete material feature compounds the sand into two level in proportion using special thin natural sand, Machine-made Sand, cobble, ovum rubble compound to 5 ~ 25 continuous gradings in proportion, 28d compression strength reaches more than 70MPa, slump >=240mm, divergence >=620mm, the time of falling slump cylinder≤9s, with intensity height, viscosity is low, high flowability, the mode of production is easily operated, is adapted to Super High(Vertical height >=350m)Pumping feature.

Description

A kind of low viscosity high flowability C60 super high-rise pumpings based on ultra fine sand compounding mix Solidifying soil
Technical field
It is especially a kind of big stream of low viscosity based on ultra fine sand compounding the present invention relates to building material technical field is belonged to Dynamic degree C60 super high-rise pumping concrete.
Background technology
Super high-rise pumping mix Design technology refers to that pumping height exceedes 100m modernization concrete pumping Technology.With the extension of urbanization process, high-rise building is more and more, and super high-rise pumping mix Design technology is As the indispensable key of Construction Technology of Super Tall Buildingin, to height more than 350m high-rise building pump concrete For, the concrete of high intensity is pumped, pressure is high, viscosity is big, and pumping construction is especially difficult, thereby produces and a series of urgently solves Construction technology problem certainly.Therefore, the super high-rise pumping technology of strong concrete is studied, for construction of super highrise building matter Amount, efficiency of construction have especially important realistic meaning and practical value.
High-rise building is the feature of modern urban construction, and the embodiment of Modern Construction Enterprise scientific and technological strength, in recent years, With the propulsion of the development of Building Trade in China, and Development of China's Urbanization, urban land resource is increasingly short, various high-rise, superelevation Layer building continues to bring out, and this performance to concrete proposes requirements at the higher level;Super high-rise pumping concrete construction technology is to coagulation Native compound method and performance indications all propose very high requirement, and new evaluation index is it is also proposed to concrete pumpability.At present, Although high-strength, superelevation is strong both at home and abroad, high-rise, super high-rise pumping concrete has obtained wide application, because Machine-made Sand is more In triangle body or polyhedron, rough surface, corner angle are sharp, and grading is poor, and modulus of fineness is larger, compared with special thin natural sand, make The concrete prepared with Machine-made Sand especially prepares high-strength concrete, slump compared with it is small, water requirement is big, workability is slightly worse, but make entirely Later stage contraction and problems of crack are considered again with special thin natural sand, and especially for Sichuan-chongqing Region, Machine-made Sand granule-morphology compares Difference and be gap gradation, and river sand fineness is partially thin, essentially ultra fine sand(Modulus of fineness 0.8 or so), single use can not all solve Certainly super high-rise pumping problem, therefore fine aggregate is used as using special thin natural sand and Machine-made Sand mixing, to reach good workability Energy.
In order to solve the problems, such as the super high-rise pumping of high-strength concrete, many research workers represent existing by making great efforts always There is horizontal example as follows:
In December, (1) 2010, Chinese patent " CN101164959B " disclose a kind of long pumping distance machine-made sand concrete, and grade is C50, pumping height are 214m (reduced height), use P042.5 400~425kg of cement per square concrete, modulus of fineness is 3.05 mechanism 800~780kg, 5~16mm Stone 310~300kg, 16~25mm 720~700kg of Stone, water 160 ~155kg, I level 75~80kg of flyash, water-reducing rate are 20~30% water reducer 18~24kg, each mixture by stirring and Into, but strength grade is only C50;
(2) Chen Lianfa, Chen Yue, Lu Yang are in document《C60 super high-rise pumping mix Design researchs》Once successful formulation was complete Machine-made sand concrete, but cement consumption is larger, and initial slump is 180~215mm, and vertical pumping height is also only 80m;
(3) ancient prescription, paint Jiang Feng are in document《The preparation technique research of C60 artificial sand High Strength Pump Concretes》It is middle to be coordinated using table 2 Than prepare the artificial sand concretes of C60, but river sand used herein be in thick river sand, with Sichuan-chongqing Region used in ultra fine sand difference it is larger, And vertical pumping height does not also refer to.
Table 2.《The preparation technique research of C60 artificial sand High Strength Pump Concretes》Coordinate when performance
Nevertheless, answered for high-strength (C60 levels and more than) Super High (more than vertical height 350m) the machine sand river sand in Sichuan-chongqing Region Open report is had not yet to see with pump concrete.Therefore, how according to Chongqing of Sichuan the preparation of material feature is high-strength is easy to the mixed of super high pump-conveying Solidifying soil is still the problem of concrete technology.
In summary, in order to meet project construction feature and adapt to the requirement of social high-rise building concrete, according to river The C60 concrete that ground material the characteristic study low viscosity high flowability in Chongqing is easy to super high pump-conveying seems particularly urgent and necessary.
The content of the invention
Therefore, it is poor for above-mentioned Sichuan-chongqing Region current material material, pattern, and existing mechanism sand resource, technical problem, Special thin natural sand and Super High (more than vertical height 350m) pump concrete of the compound preparation of special thin natural sand are provided, this is mixed Coagulate native 28d compression strength and reach more than 70MPa, slump >=240mm, divergence >=600mm, the time of falling slump cylinder≤10s, Fully meet super high-rise pumping requirement.
The present invention, which is achieved in that, constructs a kind of low viscosity high flowability C60 Super High pumps based on ultra fine sand compounding Concrete is sent, it is formed by following starting components mixings, based on quality of materials contained by every m3 concrete:
Cement:364~432kg;
Miberal powder:41~54kg;
Flyash:52~75kg;
Silicon ash:0~32kg;
Special thin natural sand:130~330kg;
Machine-made Sand:390~663kg;
Cobble:552~884kg;
Ovum rubble:184~442kg;
Additive:9.8~15.1kg;
Water:156~168kg.
The cement PO52.5 class g cements, its Strength surplus coefficient >=1.15, other indexs meet GB175-2007《It is logical With portland cement standard》It is required that.
The miberal powder is S95 level miberal powders, specific surface area >=400kg/m3, fluidity ratio >=95%, loss on ignition≤3.0%.
The flyash is II grade of flyash, and 45 μm of square hole screens tail over≤25%, needs water ratio≤105%, loss on ignition≤ 8.0%.
The mechanism grain fineness number modulus 2.5~3.2, clay content≤2.0%, clod content < 1.0%, MB values < 1.4, pressure Broken value index < 25%.
The special thin natural grain fineness number modulus 0.8~1.0, clay content≤2.0%, clod content < 1.0%.
The stone is 5~31.5mm and two kinds of 5~25mm mixing, and the former accounts for 65%~75%, and the latter accounts for 25% ~35%, crush values index≤7%, flat-elongated particles content≤5%.
The additive is polycarboxylate water-reducer, and water-reducing rate is the high efficiency water reducing agent of 22% and the above.
The water, which is made a living, applies flexibly drinking water.
Described concrete 28d compression strength reaches more than 70MPa, slump >=240mm, divergence >=600mm, collapses Degree of falling cylinder time≤10s, vertical more than pumping height 350m.
The invention has the advantages that:The beneficial effects of the invention are as follows:
(1) concrete produced by the invention is that one kind is applied to high-strength super high-rise pumping concrete, the thin bone that the concrete uses Material is all Machine-made Sand and the compound preparation of special thin natural sand, and intensity >=70MPa, slump >=240mm, divergence >=600mm, falls The slump cylinder time≤9s, concrete is pumped to building more than vertical height 350m, overcome river to a certain extent The existing thickness aggregate grading in Chongqing area, pattern are poor, the problem of being not easy to pump, to prepare low viscosity high flowability C60 Super Highs Pump concrete provides Technical Reference;
(2) concrete produced by the invention is a kind of high flowability C60 super high-rise pumping concrete, based on ultra fine sand and machine sand Compounding use, while improving the service behaviour of concrete, fluidity is drastically increased,
Meet Sichuan-chongqing Region summer high temperature, the requirement of pumping construction under the big climatic characteristic of day and night temperature;
(3) compared with existing Chinese patent " CN101164959B " technology, super high-rise pumping strength grade of concrete of the present invention by C50 rises to C60, and folk prescription concrete cement dosage by PO42.5 400~425kg be reduced to PO42.5 360~ 430kg, the voidage of concrete is reduced, using large dosage (20% ~ 30%) industry byproduct -- II grade of flyash and miberal powder, change It is apt to the service behaviour of full machine-made sand concrete, reduces cement consumption, reduce concrete shrinkage, reduces production cost;
(4) with existing Jiang Jingping, Zhang Hongxin, Li Shubao document《The experimental study of C60 Machine-made Sand high-performance pumping concretes》 The technology referred to is compared, and cement consumption of the present invention is down to 400~355kg/m3, and large dosage by 425 original~445kg/m3 Using mineral admixture, hydration heat of concrete is reduced, concrete is reduced and shrinks, the collocation of particle diameter 5~10mm and 5~25mm rubble uses (because mixing plant stone grading is discontinuous, two kinds of stone use of arranging in pairs or groups), initial slump degree reaches 240mm, and vertical pumping height is by original The 80m come brings up to more than 350m;
(5) in the present invention, fine aggregate using Machine-made Sand and special thin natural sand compounding, using 60%~80% modulus of fineness be 2.5 ~ 3.2 Machine-made Sand and 20%~40% modulus of fineness are that 0.8 ~ 1.0 special thin river sand collocation is the grain fineness number mould that control has compounded Number is between 2.3 ~ 3.0, in addition to the modulus of fineness that Machine-made Sand is used alone except that can significantly reduce, due to the round and smooth grain of river sand Type, to improve concrete workability have remarkable effect, especially for using 100% Machine-made Sand when, easily grab bottom, workability is not Good situation improves obvious;Simultaneously using the rubble and 20%~40% 5~10mm that 60%~80% particle diameter is 10~25mm Rubble is arranged in pairs or groups, and coarse aggregate control is so optimized the grading of stone used in mixing plant, together between 5 ~ 25 continuous gradings When, coarse aggregate specific surface area can be reduced, aggregate bulk density is improved, so as to reduce mortar, makes the concrete mixed and stirred out Workability is good, reduces concrete viscosity;
It is (6) produced by the invention that by spy, carefully natural sand and the super high-rise pumping concrete of the compound preparation of Machine-made Sand sand are common Realized under the conditions of concrete production technology, institute is all commerical ready-mixed concrete conventional material using raw material, and cheap, material is easy .
Embodiment
The present invention is described in detail below, and the technical scheme in the embodiment of the present invention is carried out clearly and completely Description, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this hair Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Example, belongs to the scope of protection of the invention.
The present invention provides a kind of low viscosity high flowability C60 super high-rise pumpings compounded based on ultra fine sand herein by improving Concrete;The raw materials used source of following examples is specific as follows:
(1) cement:Lafarge PO42.5 class g cements, Ji east PO42.5 class g cements, its Strength surplus coefficient >=1.15;
(2) miberal powder:The auspicious many S95 levels miberal powders in Chongqing, specific surface area >=400kg/m3, fluidity ratio >=95%, loss on ignition≤ 3.0%;
(3) flyash:II grade of flyash of Chongqing Luo semi-annular jade pendant, 45 μm of square hole screens tail over≤25%, need water ratio≤105%, and loss on ignition≤ 8.0%;
(4) Machine-made Sand:Chongqing locality mountain stone Machine-made Sand, modulus of fineness 2.5~3.2, clay content≤2.0%, clod content < 1.0%, MB value < 1.4, crush values index < 25%;
(5) river sand:The special thin river sand in Yichang, modulus of fineness 0.8~1.0, clay content≤2.0%, clod content < 1.0%;
(5) stone:Two kinds of Chongqing locality rubble, 5~10mm and 10~25mm, the former accounts for 20%~40%, and the latter accounts for 60%~ 80%, crush values index≤3%, flat-elongated particles content≤5%;
(6) additive:Make (highly concentrated type) polycarboxylate water-reducer, water-reducing rate >=25% by oneself;
The water, which is made a living, applies flexibly drinking water.
Embodiment 1~9:
The present invention is by using binder materials and mineral admixture volume, different sand fractions and admixture dosage, to concrete Carried out a series of trials, drawn match ratio as shown in table 3, if but using other different water-reducing rates additive carry out it is various etc. Valency substitutes the modification of form, falls within scope of the invention as claimed.
The full made sand ultra-high pump concrete match ratios of table 3.C60
Project Cement S95 miberal powders II grade of flyash Silicon ash Sand ratio Stone ratio Additive Water
Embodiment 1 408 69 53 0 8:2 6:4 10.6 159
Embodiment 2 408 69 53 0 7:3 6:4 10.6 159
Embodiment 3 408 69 53 0 6:4 6:4 10.9 159
Embodiment 4 392 69 53 16 8:2 6:4 11.6 159
Embodiment 5 392 69 53 16 7:3 6:4 12.1 159
Embodiment 6 392 69 53 16 6:4 6:4 12.5 159
Embodiment 7 408 69 53 0 7:3 7:3 10.6 159
Embodiment 8 408 69 53 0 7:3 8:2 10.6 159
Embodiment 9 392 69 53 16 7:3 7:3 11.6 159
Above-mentioned match ratio is converted into 30L concrete materials in proportion, stirred in the small-sized concrete mixer that nominal volume is 60L Mix, step is:(1) mortar and a small amount of stone that trial is first formed by the cement, sand and water of match ratio every time, are rinsed in mixer Thorax;(2) mixer is started, the admixture such as stone, sand and cement and flyash miberal powder is sequentially added in mixer, dry mixing 30s, then water (additive is mixed in water) is added slowly, after water and additive whole addition, continue to mix and stir 2min;(3) will mix Compound is drawn off from mixer, is poured into spice pot, then after manually mixing and stirring about 1min, tests the properties experiment of mixture And shaping test piece, result of the test are as shown in table 4.
The lower ultra-high pump concrete mechanical property of table 4.C60 machine sand river sands different proportion compounding and service behaviour result
From upper table table 4 as can be seen that the concrete properties are good, meet super high-rise pumping concrete requirement.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one The most wide scope caused.

Claims (10)

  1. A kind of 1. low viscosity high flowability C60 super high-rise pumping concrete based on ultra fine sand compounding, it is characterised in that:The coagulation Soil is formed by following starting components mixings, based on quality of materials contained by every m3 concrete:
    Cement:364~432kg;
    Miberal powder:41~54kg;
    Flyash:52~75kg;
    Silicon ash:0~32kg;
    Special thin natural sand:130~330kg;
    Machine-made Sand:390~663kg;
    Cobble:552~884kg;
    Ovum rubble:184~442kg;
    Additive:9.8~15.1kg;
    Water:156~168kg.
  2. A kind of 2. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 1 Soil, it is characterised in that:The cement is P O42.5 class g cements, its Strength surplus coefficient >=1.15.
  3. 3. a kind of low viscosity high flowability C60 super high-rise pumpings based on ultra fine sand compounding according to claim 1 or 2 mix Solidifying soil, it is characterised in that the miberal powder is S95 level miberal powders, its specific surface area >=400kg/m3, fluidity ratio >=95%, loss on ignition ≤3.0%。
  4. A kind of 4. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 3 Soil, it is characterised in that:The flyash is II grade of flyash but is not limited to II grade of flyash, including I grade of flyash and former ash, and 45 μm square hole screen tails over≤25%, needs water ratio≤105%, loss on ignition≤8.0%.
  5. A kind of 5. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 3 Soil, it is characterised in that:The sand coarse aggregate ratio is 37 ~ 44%.
  6. A kind of 6. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 5 Soil, it is characterised in that:The mechanism grain fineness number modulus 2.5~3.2, clay content≤2.0%, clod content < 1.0%, MB values < 1.4, crush values index < 25%;The ultra fine sand modulus of fineness 0.8~1.0, clay content≤2.0%, clod content < 1.0%, institute The mixing that sand is two kinds of Machine-made Sand and ultra fine sand is stated, the former accounts for 60%~80%, and the latter accounts for 20%~40%.
  7. 7. a kind of cobble according to claim 5 and the C60 super high-rise pumping concrete of the compound preparation of ovum rubble, its feature It is:The stone is respectively two kinds of 10~25mm and 5~10mm mixing, and the former accounts for 60%~80%, and the latter accounts for 20%~40%, Crush values index≤7%, flat-elongated particles content≤5%.
  8. 8. according to described in claim 7 it is a kind of based on ultra fine sand compounding low viscosity high flowability C60 super high-rise pumping concrete, It is characterized in that:The additive is that water-reducing rate is 22% and the high efficiency water reducing agent of the above, described water reducer include polycarboxylic acids height Imitate water reducer.
  9. A kind of 9. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 8 Soil, it is characterised in that:The water, which is made a living, applies flexibly drinking water.
  10. A kind of 10. low viscosity high flowability C60 super high-rise pumping coagulations based on ultra fine sand compounding according to claim 1 Soil, it is characterised in that:Concrete 28d compression strength reaches more than 70MPa, slump >=240mm, divergence >=600mm, The time of falling slump cylinder≤9s, vertical more than pumping height 350m.
CN201710603735.7A 2017-07-23 2017-07-23 A kind of low viscosity high flowability C60 super high-rise pumping concrete based on ultra fine sand compounding Pending CN107382190A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109503055A (en) * 2019-01-04 2019-03-22 河北建业预拌混凝土有限公司 A kind of self-compacting concrete and preparation method thereof
CN111153655A (en) * 2020-01-17 2020-05-15 重庆华西易通建设股份有限公司 C60 pump concrete and preparation method thereof
CN111646753A (en) * 2020-06-18 2020-09-11 湖北合力久盛混凝土有限公司 Preparation method of C80 machine-made sand concrete

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102503279A (en) * 2011-11-09 2012-06-20 中冶建工集团有限公司 Large-flowability and high-strength concrete
CN104230223A (en) * 2014-08-22 2014-12-24 中铁二局股份有限公司 High-strength and vibration-free self-compacting concrete prepared from machine-made sand
CN105859224A (en) * 2016-05-13 2016-08-17 广州大学 High-strength easily-pumped concrete prepared from hill sand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102503279A (en) * 2011-11-09 2012-06-20 中冶建工集团有限公司 Large-flowability and high-strength concrete
CN104230223A (en) * 2014-08-22 2014-12-24 中铁二局股份有限公司 High-strength and vibration-free self-compacting concrete prepared from machine-made sand
CN105859224A (en) * 2016-05-13 2016-08-17 广州大学 High-strength easily-pumped concrete prepared from hill sand

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109503055A (en) * 2019-01-04 2019-03-22 河北建业预拌混凝土有限公司 A kind of self-compacting concrete and preparation method thereof
CN111153655A (en) * 2020-01-17 2020-05-15 重庆华西易通建设股份有限公司 C60 pump concrete and preparation method thereof
CN111646753A (en) * 2020-06-18 2020-09-11 湖北合力久盛混凝土有限公司 Preparation method of C80 machine-made sand concrete

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Application publication date: 20171124