CN104844107A - Micro-concrete and application thereof - Google Patents
Micro-concrete and application thereof Download PDFInfo
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- CN104844107A CN104844107A CN201510158164.1A CN201510158164A CN104844107A CN 104844107 A CN104844107 A CN 104844107A CN 201510158164 A CN201510158164 A CN 201510158164A CN 104844107 A CN104844107 A CN 104844107A
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Abstract
The invention discloses a micro-concrete and an application thereof. The micro-concrete comprises cement, river sand, quartz sand, lime and water according to a mass ratio of 1:6.5:0.5:0.5:1.4; the quartz sand is used for stimulating coarse aggregates in concrete, and the river sand is used for stimulating fine aggregates in the concrete; and the micro-concrete is applied to earthquake simulation vibration table model tests. The low elastic modulus micro-concrete with a model structure made in the invention has low compressive strength and low elastic modulus, and can simultaneously meet requirements of a similar relationship of a model material in the earthquake simulation vibration table model tests to a prototype structure material.
Description
Technical field
The present invention relates to a kind of material of analogue formation structure, be specifically related to a kind of microconcrete and application thereof.
Technical background
Along with the fast development of China's building industry, some large-scale, complicated concrete structures of earthquake areas are increasing, due to the limitation of specification and the security requirement of structure, the structure of these Special complexes usually needs the anti-seismic performance by earthquake simulation shaking table model investigation structure, due to the limitation of testing installation, the prototype structure dimension model of 1:1 is adopted to carry out testing and be often difficult to realize, making small proportion scaled-down model and simulate prototype structure, is one of effective way solving problems.For small proportion scaled-down model structure, because structural member size is little, the normal concrete of Large stone cannot be built usually; And although building mortar can build model structure, the concrete material in building mortar and prototype structure has essential distinction, cannot realize the condition that intensity and Young's modulus meet similarity relation simultaneously, can not simulate the mechanical property of prototype structure concrete material.
Summary of the invention
For defect of the prior art and deficiency; the invention provides a kind of in shaking-table test the microconcrete for analogue formation structure, make concrete ultimate compression strength and Young's modulus in model structure material and prototype structure all meet ratio of similitude requirement.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of microconcrete, this microconcrete comprises cement, river sand, quartz sand, lime and water, and the amount ratio of cement, river sand, quartz sand, lime and water is determined according to simulated concrete strength; Described quartz sand is used for the coarse aggregate in simulation concrete, and described river sand is used for the fine aggregate in simulation concrete.
For C40 concrete, microconcrete is cement in mass ratio: river sand: quartz sand: lime: water=1:6.5:0.5:0.5:1.4.
Concrete, the particle diameter of described quartz sand is 2.5 ~ 5mm; The particle diameter of described river sand is less than 2.5mm, and described cement adopts No. 425 silicate cements.
More specifically, the preparation method of this microconcrete comprises:
Quartz sand, river sand and cement are put into stirrer successively by formula rate and stirs 120s, then add the lime under agitation 120s of formula ratio; Then adding mass percent is that the water of 60% formula ratio mixes and stirs, and stirs 180s; Adding mass percent afterwards is again that the water of 40% formula ratio mixes and stirs, then stirs 120s.
Described microconcrete is used for the application of earthquake simulation shaking table model trial.
Advantage of the present invention is:
(1) microconcrete of analogue formation structure of the present invention has the feature of low compressive strength and low elastic modulus, all can reach 1/5 ~ 1/4 of prototype structure normal concrete ultimate compression strength and Young's modulus, strong mechanical property, can be used for making undersized scaled-down model structure;
(2) ultimate compression strength of low elastic modulus microconcrete of analogue formation structure that adopts of the present invention and Young's modulus can meet the condition of similarity relation in earthquake simulation shaking table model trial simultaneously, and manufacture craft is simple.
Embodiment
Microconcrete of the present invention comprises cement, river sand, quartz sand, lime and water, in mass ratio cement: river sand: quartz sand: lime: water=1:6.5:0.5:0.5:1.4; Quartz sand is used for the coarse aggregate in simulation concrete, and river sand is used for the fine aggregate in simulation concrete, and the particle diameter of quartz sand is 2.5 ~ 5mm; The particle diameter of described river sand is less than 2.5mm, and described cement adopts No. 425 silicate cements; Study contriver by experiment to find to simulate coarse aggregate with quartz sand, intend fine aggregate with river sand mo(u)ld, the concrete be mixed with meets the requirement of earthquake simulation shaking table model trial.
Concrete, the preparation method of this microconcrete comprises: quartz sand, river sand and cement are put into stirrer successively by formula rate and stirs 120s, then adds the lime under agitation 120s of formula ratio; Then adding mass percent is that the water of 60% formula ratio mixes and stirs, and stirs 180s; Adding mass percent afterwards is again that the water of 40% formula ratio mixes and stirs, then stirs 120s, and the preparation time of the microconcrete prepared by present method is short, within 10min, just can complete this process for preparation, substantially reduces the preparation time.
Described microconcrete is used for the application of earthquake simulation shaking table model trial; this microconcrete has the feature of low compressive strength and low elastic modulus; all can reach 1/5 ~ 1/4 of prototype structure normal concrete ultimate compression strength and Young's modulus; strong mechanical property; can be used for making undersized scaled-down model structure, meet the requirement of earthquake simulation shaking table model trial.
Embodiment one:
In the earthquake simulation shaking table model trial of Loess Site subway underground station, the microconcrete of the analogue formation structure of the present embodiment is adopted to make two-layer twin spans subway underground station model structure.
The scaling factor of subway underground station model structure is 1/30, and height is 467mm, and wide is 640mm, and long is 1320mm, the thick 26.7mm of top board, middle thickness of slab 13.3mm, the thick 33.3mm of base plate, wall thickness 23.3mm; Middle column cross-section size 26.7mm × 40mm, spacing 300mm.The present embodiment mesarcs subway underground station adopts C40 concrete, and by the requirement of similar Design, strength similarity constant and the Young's modulus affinity constant of the low elastic modulus microconcrete of analogue formation structure are 1/5.
The component of the microconcrete of the analogue formation structure of the present embodiment is cement, river sand, quartz sand, lime and water, in mass ratio cement: river sand: quartz sand: lime: water=1:6.5:0.5:0.5:1.4.
The particle diameter of quartz sand is that 2.5mm ~ 5mm is to simulate the concrete coarse aggregate of C40 in the structure of prototype subway underground station; The particle diameter of river sand is less than 2.5mm and has continuous grading to simulate the concrete fine aggregate of C40 in the structure of prototype subway underground station; Cement adopts No. 425 ordinary Portland cements; Lime adopts dry hydrate, and main component is Ca (OH)
2.
The preparation method of the microconcrete of the analogue formation structure of this embodiment is: first quartz sand, river sand and cement are put into mixer in proportion successively and stir 120s, then add required lime under agitation 120s; Add the mixing water of 60% subsequently, and stir 180s; Add the mixing water of 40% afterwards again, then stir 120s.
Below mechanical property test and the result thereof of the low elastic modulus microconcrete of the analogue formation structure about the present embodiment that contriver provides:
(1) adopt the standard die trial of 100mm × 100mm × 100mm to make test cube, by normal curing method maintenance 28 days, carry out cubic compressive strength test.Test-results shows: the microconcrete cubic compressive strength mean value of analogue formation structure is 8.11Mpa;
(2) adopt the standard die trial of 100mm × 100mm × 300mm to make prism test block, by normal curing method maintenance 28 days, carry out elasticity modulus test.Test-results shows: the Young's modulus mean value of the microconcrete of analogue formation structure is 0.66 × 10
4mpa;
Viewing test finds, the C40 concrete in the stress deformation process of the microconcrete of analogue formation structure and damage-form and prototype structure is similar.
More than test shows, the cubic compressive strength of the microconcrete of the analogue formation structure that the present invention adopts is 8.11MPa, and Young's modulus is 0.66 × 10
4mPa.Be 40MPa according to the concrete cubic compressive strength of " Code for design of concrete structures " GB50010, C40, Young's modulus is 3.25 × 10
4mPa.The ultimate compression strength of the low elastic modulus microconcrete of the analogue formation structure of this embodiment and Young's modulus are all about 1/5 of C40 concrete respective strengths index, and its ultimate compression strength and Young's modulus meet the condition that in earthquake simulation shaking table model trial, similarity relation requires simultaneously; C40 concrete in its stress deformation process and damage-form and prototype structure is similar, and manufacture craft is simple.
Claims (5)
1. a microconcrete, is characterized in that, this microconcrete comprises cement, river sand, quartz sand, lime and water, and the amount ratio of cement, river sand, quartz sand, lime and water is determined according to simulated concrete strength; Described quartz sand is used for the coarse aggregate in simulation concrete, and described river sand is used for the fine aggregate in simulation concrete.
2. microconcrete as claimed in claim 1, is characterized in that, in mass ratio cement: river sand: quartz sand: lime: water=1:6.5:0.5:0.5:1.4.
3. microconcrete as claimed in claim 2, it is characterized in that, the particle diameter of described quartz sand is 2.5 ~ 5mm; The particle diameter of described river sand is less than 2.5mm, and described cement adopts No. 425 silicate cements.
4. the microconcrete as described in claim 1,2 or 3, is characterized in that, the preparation method of this microconcrete comprises:
Quartz sand, river sand and cement are put into stirrer successively by formula rate and stirs 120s, then add the lime under agitation 120s of formula ratio; Then adding mass percent is that the water of 60% formula ratio mixes and stirs, and stirs 180s; Adding mass percent afterwards is again that the water of 40% formula ratio mixes and stirs, then stirs 120s.
5. the microconcrete described in claim 1,2,3 or 4 is used for the application of earthquake simulation shaking table model trial.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108303298A (en) * | 2018-01-29 | 2018-07-20 | 招商局重庆交通科研设计院有限公司 | A kind of artificially preparation method of sand-pebble layer model test material |
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| US5326396A (en) * | 1993-07-29 | 1994-07-05 | W. R. Grace & Co.-Conn. | Low shrinkage cement composition |
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| CN103043986A (en) * | 2013-01-25 | 2013-04-17 | 中国科学院武汉岩土力学研究所 | Rock soil similar material and preparation method thereof |
| CN103265240A (en) * | 2013-05-20 | 2013-08-28 | 太原理工大学 | Concrete dynamic model material |
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Patent Citations (4)
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| US5326396A (en) * | 1993-07-29 | 1994-07-05 | W. R. Grace & Co.-Conn. | Low shrinkage cement composition |
| CN102645310A (en) * | 2012-05-08 | 2012-08-22 | 同济大学 | Complete set of test method of soft soil iron structure vibration table |
| CN103043986A (en) * | 2013-01-25 | 2013-04-17 | 中国科学院武汉岩土力学研究所 | Rock soil similar material and preparation method thereof |
| CN103265240A (en) * | 2013-05-20 | 2013-08-28 | 太原理工大学 | Concrete dynamic model material |
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| CN108303298A (en) * | 2018-01-29 | 2018-07-20 | 招商局重庆交通科研设计院有限公司 | A kind of artificially preparation method of sand-pebble layer model test material |
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Inventor after: Han Rimei Inventor after: Zhou Shenhua Inventor after: Zhang Jia Inventor after: Wang Yihong Inventor after: Quan Dengzhou Inventor after: Ye Dan Inventor after: Ma Pengbo Inventor after: Yin Shangzhi Inventor before: Wang Yihong Inventor before: Quan Dengzhou Inventor before: Zhang Youchao Inventor before: Ye Dan Inventor before: Yin Shangzhi Inventor before: Ma Pengbo |
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Effective date of registration: 20160506 Address after: 710018 Shaanxi Province, Xi'an City Economic Development Zone Weiyang Road No. 132 Applicant after: Xi'an sub. limited liability company Address before: 710064 Shaanxi Province, Xi'an Yanta District No. 126 Middle Ring Road Applicant before: Changan Univ. |
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Application publication date: 20150819 |