CN101353242A - Machine-made sand self-compaction concrete - Google Patents

Machine-made sand self-compaction concrete Download PDF

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Publication number
CN101353242A
CN101353242A CNA2008100460739A CN200810046073A CN101353242A CN 101353242 A CN101353242 A CN 101353242A CN A2008100460739 A CNA2008100460739 A CN A2008100460739A CN 200810046073 A CN200810046073 A CN 200810046073A CN 101353242 A CN101353242 A CN 101353242A
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China
Prior art keywords
machine
made sand
compacting concrete
self
cobble
Prior art date
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Pending
Application number
CNA2008100460739A
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Chinese (zh)
Inventor
高育欣
向卫平
郑广军
简晓军
修晓明
胡建平
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China Construction Third Engineering Bureau Co Ltd
China Construction Ready Mixed Concrete Co Ltd
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Concrete Service Station of China Construction Third Bureau Co Ltd Chengdu Branch
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Application filed by Concrete Service Station of China Construction Third Bureau Co Ltd Chengdu Branch filed Critical Concrete Service Station of China Construction Third Bureau Co Ltd Chengdu Branch
Priority to CNA2008100460739A priority Critical patent/CN101353242A/en
Publication of CN101353242A publication Critical patent/CN101353242A/en
Pending legal-status Critical Current

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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
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00103—Self-compacting mixtures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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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)
  • Revetment (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a machine-made sand self-compacting concrete. The concrete is made from the following components according to parts by weight: 100 parts of cement, 25-45 parts of fly ash, 0-30 parts of mineral powder, 0.8-1.5 parts of a polycarboxylic acid water reducing agent, 220-250 parts of machine-made sand, 130-150 parts of cobble and 130-150 parts of crushed stone. The concrete saves natural resource as well as has high fluidity, high stability and low slump loss; compared with equivalent effects, the concrete has the advantages of lower cost and simpler production, meanwhile, silicon dust is not applied to the concrete, therefore, the health of operators is better guaranteed.

Description

A kind of machine-made sand self-compacting concrete
Technical field
The invention belongs to the material of construction class, relate to a kind of concrete that is used for industry and covil construction, particularly relate to a kind of machine-made sand self-compacting concrete of without vibration.
Background technology
Self-compacting concrete requires concrete mix to have " liquefaction " character, possesses good mobility energy and stability, need not vibrate during construction.The technology of current preparation self-compacting concrete is generally used river sand, utilizes its good grating and particle particle shape, than being easier to realize " self-compacting ".At present, machine-processed sand has become a kind of conventional material in the normal concrete, uses relatively ripe; But with river sand facies ratio, machine-processed sand particle particle shape is poor, and grating is poor, tends to reduce the flowing property and the stability of fresh concrete.Yet along with the continuous exhaustion of natural resource such as river sand, the application of artificial resource in self-compacting concrete such as discovery mechanism sand become a kind of trend.
Notification number is the patent of invention of CN1323049C, discloses a kind of machine-made sand self-compacting concrete, is mixed by cement, flyash, silicon ash, other mineral admixtures, polycarboxylate water-reducer, tackifier, defoamer, machine-processed sand and rubble and forms.The component that this invention has used silicon ash, defoamer, tackifier etc. also not to find broad application in normal concrete at present, the flowing property and the stability of concrete system have been improved effectively, but because the price of exotic materialss such as silicon ash is relatively expensive, make this invention exist application cost higher relatively, production operation is relatively than defectives such as complexity; Because the silicon ash is a kind of super-fine material, the people inhales tuberculosis if suck easy suffering from, and limited by commerical ready-mixed concrete stirring station production technique simultaneously, and general the employing manually added when producing at present, very easily operator caused actual bodily harm.
Summary of the invention
Purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of without vibration is provided, and has the machine-made sand self-compacting concrete of high workability, high stability and low slump loss, not only save natural resource, and compare equal effect, with low cost, produce easy, harmless.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of machine-made sand self-compacting concrete, calculate according to components by weight percent, comprise and forming 100 parts of cement, flyash 25-45 part, breeze 0-30 part, polycarboxylate water-reducer 0.8-1.5 part, machine-processed sand 220-250 part, cobble 130-150 part, the mixing of rubble 130-150 part.During use, with the water and the above-mentioned materials mixing of 45-60 part, according to different water cement ratio distribution situations, the 28d intensity of described machine-made sand self-compacting concrete can reach 50-70Mpa.Do not use exotic materialss such as silicon ash, tackifier, defoamer in the described machine-made sand self-compacting concrete, but widely used conventional material in the utilization normal concrete helps simplifying and produces and quality control; And above-mentioned exotic materials price is relatively costly, wherein silicon ash price be about cement 8-10 doubly, so the present invention has cheaper cost.
Described machine-processed sand is the fine aggregate of described machine-made sand self-compacting concrete, is that raw material crushing forms with the cobble, fineness modulus 2.5-3.0, and grating reaches the medium sand edge requirement of II district, content of stone powder 8%-10%.The whole employment mechanism sand of fine aggregate are not only expanded the materials used of self-compacting concrete, the more important thing is that river sand resource is had a kind of provide protection, to the positive meaning of improving the ecological environment.
Described cobble and rubble mixed in 1: 1 by weight proportion, constituted the coarse aggregate of described machine-made sand self-compacting concrete, and wherein cobble is the 5-16mm continuous grading, and rubble is the 10-20mm continuous grading, and all through washing, silt content is all less than 0.5% for cobble and rubble.Described cement is ordinary Portland cement, intensity 〉=42.5 strength grades.Described flyash is I level or II level flyash, and it needs water than≤100%.Described breeze is the S75 level, specific surface area 330m 2/ kg-390m 2/ kg, the degree of mobilization ratio is greater than 105%.Described polycarboxylate water-reducer is a kind ofly to contain efficient diminishing component and Xu is put the high molecular poly carboxylic acid series water reducer of type, has the good operation degree and keeps performance, and solid content is 20%.
The present invention has following beneficial effect: on the basis of saving natural resource, not only have high workability, high stability and low slump loss, and compare equal effect, cost is cheaper, produce easier, do not use the silicon ash owing among the present invention simultaneously, so health of operators is more secure.
Embodiment
Embodiment one
Make described machine-made sand self-compacting concrete 1m 3, get cement 400kg, flyash 150kg, breeze 0kg, polycarboxylate water-reducer 4kg, machine-processed sand 920kg, cobble 560kg, rubble 560kg.Described machine-processed sand is that raw material crushing forms with the cobble, fineness modulus 2.8, and grating reaches the medium sand edge requirement of II district, content of stone powder 9%.Described cobble is the 5-16mm continuous grading, and rubble is the 10-20mm continuous grading, and all through washing, silt content is 0.4% for cobble and rubble.Described cement is ordinary Portland cement, and intensity is 42.5 strength grades.Described flyash is I level flyash, and it needs the water ratio is 100%.Described breeze is the S75 level, specific surface area 360m 2/ kg, degree of mobilization is than 110%.Described polycarboxylate water-reducer solid content is 20%.
During use, water and above-mentioned materials mixing with 200kg can make described machine-made sand self-compacting concrete.The slump of this machine-made sand self-compacting concrete mixture, slump divergence, the elution time of falling the slump see Table 1; The ultimate compression strength in this machine-made sand self-compacting concrete different length of times sees Table 2.
Embodiment two
Make described machine-made sand self-compacting concrete 1m 3, get cement 350kg, flyash 100kg, breeze 100kg, polycarboxylate water-reducer 2.8kg, machine-processed sand 770kg, cobble 525kg, rubble 525kg.Described machine-processed sand is that raw material crushing forms with the cobble, fineness modulus 2.5, and grating reaches the medium sand edge requirement of II district, content of stone powder 8%.Described cobble is the 5-16mm continuous grading, and rubble is the 10-20mm continuous grading, and all through washing, silt content is 0.35% for cobble and rubble.Described cement is ordinary Portland cement, and intensity is 52.5 strength grades.Described flyash is II level flyash, and it needs the water ratio is 95%.Described breeze is the S75 level, specific surface area 330m 2/ kg, degree of mobilization is than 108%.Described polycarboxylate water-reducer solid content is 20%.
During use, water and above-mentioned materials mixing with 157.5kg can make described machine-made sand self-compacting concrete.The slump of this machine-made sand self-compacting concrete mixture, slump divergence, the elution time of falling the slump see Table 1; The ultimate compression strength in this machine-made sand self-compacting concrete different length of times sees Table 2.
Embodiment three
Make described machine-made sand self-compacting concrete 1m 3, get cement 400kg, flyash 100kg, breeze 50kg, polycarboxylate water-reducer 6kg, machine-processed sand 1000kg, cobble 520kg, rubble 520kg.Described machine-processed sand is that raw material crushing forms with the cobble, fineness modulus 3.0, and grating reaches the medium sand edge requirement of II district, content of stone powder 10%.Described cobble is the 5-16mm continuous grading, and rubble is the 10-20mm continuous grading, and all through washing, silt content is 0.45% for cobble and rubble.Described cement is ordinary Portland cement, and intensity is the 42.5R strength grade.Described flyash is II level flyash, and it needs the water ratio is 98%.Described breeze is the S75 level, specific surface area 390m 2/ kg, degree of mobilization is than 115%.Described polycarboxylate water-reducer solid content is 20%.
During use, water and above-mentioned materials mixing with 240kg can make described machine-made sand self-compacting concrete.The slump of this machine-made sand self-compacting concrete mixture, slump divergence, the elution time of falling the slump see Table 1; The ultimate compression strength in this machine-made sand self-compacting concrete different length of times sees Table 2.
Embodiment four
Make described machine-made sand self-compacting concrete 1m 3, get cement 300kg, flyash 135kg, breeze 90kg, polycarboxylate water-reducer 3.9kg, machine-processed sand 720kg, cobble 435kg, rubble 435kg.Described machine-processed sand is that raw material crushing forms with the cobble, fineness modulus 2.7, and grating reaches the medium sand edge requirement of II district, content of stone powder 8.5%.Described cobble is the 5-16mm continuous grading, and rubble is the 10-20mm continuous grading, and all through washing, silt content is 0.3% for cobble and rubble.Described cement is ordinary Portland cement, and intensity is 42.5 strength grades.Described flyash is I level flyash, and it needs the water ratio is 90%.Described breeze is the S75 level, specific surface area 380m 2/ kg, degree of mobilization is than 120%.Described polycarboxylate water-reducer solid content is 20%.
During use, water and above-mentioned materials mixing with 165kg can make described machine-made sand self-compacting concrete.The slump of this machine-made sand self-compacting concrete mixture, slump divergence, the elution time of falling the slump see Table 1; The ultimate compression strength in this machine-made sand self-compacting concrete different length of times sees Table 2.
Table 1 machine-made sand self-compacting concrete mixture performance
The ultimate compression strength of table 2 machine-made sand self-compacting concrete in the different length of time
Figure A20081004607300081

Claims (7)

1. machine-made sand self-compacting concrete, it is characterized in that: calculate according to components by weight percent, described machine-made sand self-compacting concrete comprises to be formed 100 parts of cement, flyash 25-45 part, breeze 0-30 part, polycarboxylate water-reducer 0.8-1.5 part, machine-processed sand 220-250 part, cobble 130-150 part, the mixing of rubble 130-150 part.
2. machine-made sand self-compacting concrete as claimed in claim 1, it is characterized in that: described machine-processed sand is the fine aggregate of described machine-made sand self-compacting concrete, is that raw material crushing forms with the cobble, fineness modulus 2.5-3.0, grating reaches the medium sand edge requirement of II district, content of stone powder 8%-10%.
3. machine-made sand self-compacting concrete as claimed in claim 1, it is characterized in that: described cobble and rubble mixed in 1: 1 by weight proportion, constitute the coarse aggregate of described machine-made sand self-compacting concrete, wherein cobble is the 5-16mm continuous grading, rubble is the 10-20mm continuous grading, all through washing, silt content is less than 0.5% for cobble and rubble.
4. as the arbitrary described machine-made sand self-compacting concrete of claim 1 to 3, it is characterized in that: described cement is ordinary Portland cement, intensity 〉=42.5 strength grades.
5. as the arbitrary described machine-made sand self-compacting concrete of claim 1 to 3, it is characterized in that: described flyash is I level or II level flyash, and it needs water than≤100%.
6. as the arbitrary described machine-made sand self-compacting concrete of claim 1 to 3, it is characterized in that: described breeze is the S75 level, specific surface area 330m 2/ kg-390m 2/ kg, the degree of mobilization ratio is greater than 105%.
7. as the arbitrary described machine-made sand self-compacting concrete of claim 1 to 3, it is characterized in that: described polycarboxylate water-reducer solid content is 20%.
CNA2008100460739A 2008-09-16 2008-09-16 Machine-made sand self-compaction concrete Pending CN101353242A (en)

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Cited By (30)

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Publication number Priority date Publication date Assignee Title
CN101798857A (en) * 2010-04-21 2010-08-11 中南大学 Special shape column
CN101806096A (en) * 2010-04-21 2010-08-18 中南大学 Steel tube-concrete composite structure
CN101898883A (en) * 2010-08-06 2010-12-01 中建商品混凝土有限公司 High-calcium fly ash concrete
CN102268246A (en) * 2011-06-14 2011-12-07 邯郸君强矿山科技有限公司 Special concrete additive for shafts
CN102617091A (en) * 2012-04-01 2012-08-01 江苏名和集团有限公司 Machine-made sand self-leveling concrete
CN102807344A (en) * 2012-07-05 2012-12-05 新疆西部建设股份有限公司 Low-strength-grade self-compacting concrete and preparation method thereof
CN102951876A (en) * 2011-08-17 2013-03-06 中冶天工上海十三冶建设有限公司 Vibration-free self-compacting concrete composition
CN103102125A (en) * 2013-01-25 2013-05-15 同济大学 Manufactured sand underwater dispersion resistant concrete and preparation method thereof
CN103288398A (en) * 2013-05-15 2013-09-11 宁波市高等级公路建设指挥部 High-performance machine-made sand marine concrete and preparation method thereof
CN103396060A (en) * 2013-08-07 2013-11-20 上海宝钢工程咨询有限公司 Concrete mixture for mass concrete construction
CN103420656A (en) * 2013-08-06 2013-12-04 昆明理工大学 Self compact concrete
CN104310866A (en) * 2014-09-19 2015-01-28 廊坊荣盛混凝土有限公司 Self-compacting concrete and preparation method thereof
CN105016671A (en) * 2014-04-29 2015-11-04 黄贺明 Superfluid self-compacting concrete and preparing method thereof
CN105036653A (en) * 2015-07-27 2015-11-11 昆山市建国混凝土制品有限公司 Self-compacting pumped concrete
CN105801053A (en) * 2016-03-16 2016-07-27 武汉源锦商品混凝土有限公司 Self-compacting concrete with high content of fly ash C40
CN106278000A (en) * 2015-05-21 2017-01-04 重庆建工住宅建设有限公司 Large fluidity machine-made sand concrete and preparation method thereof
CN106747100A (en) * 2016-12-28 2017-05-31 广州大学 A kind of high-strength mechanism rock sand concrete
CN106904892A (en) * 2017-03-28 2017-06-30 南宁市嘉大混凝土有限公司 Half self-compacting concrete
CN107382209A (en) * 2017-08-24 2017-11-24 重庆三圣实业股份有限公司 A kind of modified high flowability concrete
CN107555899A (en) * 2017-08-24 2018-01-09 重庆三圣实业股份有限公司 A kind of good high flowability concrete of pump-conveying property
CN107935486A (en) * 2017-11-23 2018-04-20 嘉兴市鼎业新型建材有限公司 A kind of high-performance color self-compacting concrete manufacture craft
CN108529934A (en) * 2017-03-06 2018-09-14 北京城建银龙混凝土有限公司 A kind of self-compacting concrete and preparation method thereof
CN108623256A (en) * 2018-05-22 2018-10-09 暨南大学 A kind of artificial sand concrete of high-strength and high performance containing two class admixtures
CN109503036A (en) * 2017-09-14 2019-03-22 南京鑫豪高分子材料有限公司 A kind of environment-friendly engineering C70 self-compacting concrete
CN111153638A (en) * 2020-01-08 2020-05-15 湖州三中混凝土有限公司 C35 self-compacting concrete adopting machine-made sand and preparation method thereof
CN111187040A (en) * 2020-01-08 2020-05-22 湖州三中混凝土有限公司 Machine-made sand self-compacting concrete and preparation method thereof
CN113135707A (en) * 2021-03-18 2021-07-20 太仓申昆混凝土有限公司 Machine-made sand self-compacting concrete
CN113307571A (en) * 2021-06-11 2021-08-27 佛冈县诚康商品混凝土有限公司 Super slump retaining concrete containing machine-made sand and preparation method thereof
CN113773021A (en) * 2021-09-23 2021-12-10 重庆中科建筑科技(集团)有限公司 Self-compacting concrete and preparation method thereof
CN115838266A (en) * 2022-12-01 2023-03-24 保利长大工程有限公司 Machine-made sand concrete and preparation method thereof

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806096A (en) * 2010-04-21 2010-08-18 中南大学 Steel tube-concrete composite structure
CN101806096B (en) * 2010-04-21 2012-07-04 中南大学 Steel tube-concrete composite structure
CN101798857A (en) * 2010-04-21 2010-08-11 中南大学 Special shape column
CN101898883A (en) * 2010-08-06 2010-12-01 中建商品混凝土有限公司 High-calcium fly ash concrete
CN102268246A (en) * 2011-06-14 2011-12-07 邯郸君强矿山科技有限公司 Special concrete additive for shafts
CN102951876A (en) * 2011-08-17 2013-03-06 中冶天工上海十三冶建设有限公司 Vibration-free self-compacting concrete composition
CN102617091A (en) * 2012-04-01 2012-08-01 江苏名和集团有限公司 Machine-made sand self-leveling concrete
CN102807344A (en) * 2012-07-05 2012-12-05 新疆西部建设股份有限公司 Low-strength-grade self-compacting concrete and preparation method thereof
CN103102125A (en) * 2013-01-25 2013-05-15 同济大学 Manufactured sand underwater dispersion resistant concrete and preparation method thereof
CN103102125B (en) * 2013-01-25 2014-11-05 同济大学 Manufactured sand underwater dispersion resistant concrete and preparation method thereof
CN103288398A (en) * 2013-05-15 2013-09-11 宁波市高等级公路建设指挥部 High-performance machine-made sand marine concrete and preparation method thereof
CN103288398B (en) * 2013-05-15 2016-01-20 宁波市高等级公路建设指挥部 High-performance machine-made sand marine concrete and preparation method thereof
CN103420656A (en) * 2013-08-06 2013-12-04 昆明理工大学 Self compact concrete
CN103396060A (en) * 2013-08-07 2013-11-20 上海宝钢工程咨询有限公司 Concrete mixture for mass concrete construction
CN103396060B (en) * 2013-08-07 2015-06-10 上海宝钢工程咨询有限公司 Concrete mixture for mass concrete construction
CN105016671A (en) * 2014-04-29 2015-11-04 黄贺明 Superfluid self-compacting concrete and preparing method thereof
CN105016671B (en) * 2014-04-29 2018-02-23 黄贺明 A kind of superfluidity self-compacting concrete and preparation method thereof
CN104310866A (en) * 2014-09-19 2015-01-28 廊坊荣盛混凝土有限公司 Self-compacting concrete and preparation method thereof
CN106278000A (en) * 2015-05-21 2017-01-04 重庆建工住宅建设有限公司 Large fluidity machine-made sand concrete and preparation method thereof
CN105036653A (en) * 2015-07-27 2015-11-11 昆山市建国混凝土制品有限公司 Self-compacting pumped concrete
CN105801053A (en) * 2016-03-16 2016-07-27 武汉源锦商品混凝土有限公司 Self-compacting concrete with high content of fly ash C40
CN106747100A (en) * 2016-12-28 2017-05-31 广州大学 A kind of high-strength mechanism rock sand concrete
CN108529934B (en) * 2017-03-06 2021-02-09 北京城建银龙混凝土有限公司 Self-compacting concrete and preparation method thereof
CN108529934A (en) * 2017-03-06 2018-09-14 北京城建银龙混凝土有限公司 A kind of self-compacting concrete and preparation method thereof
CN106904892A (en) * 2017-03-28 2017-06-30 南宁市嘉大混凝土有限公司 Half self-compacting concrete
CN107382209A (en) * 2017-08-24 2017-11-24 重庆三圣实业股份有限公司 A kind of modified high flowability concrete
CN107555899A (en) * 2017-08-24 2018-01-09 重庆三圣实业股份有限公司 A kind of good high flowability concrete of pump-conveying property
CN109503036A (en) * 2017-09-14 2019-03-22 南京鑫豪高分子材料有限公司 A kind of environment-friendly engineering C70 self-compacting concrete
CN107935486A (en) * 2017-11-23 2018-04-20 嘉兴市鼎业新型建材有限公司 A kind of high-performance color self-compacting concrete manufacture craft
CN108623256A (en) * 2018-05-22 2018-10-09 暨南大学 A kind of artificial sand concrete of high-strength and high performance containing two class admixtures
CN111153638A (en) * 2020-01-08 2020-05-15 湖州三中混凝土有限公司 C35 self-compacting concrete adopting machine-made sand and preparation method thereof
CN111187040A (en) * 2020-01-08 2020-05-22 湖州三中混凝土有限公司 Machine-made sand self-compacting concrete and preparation method thereof
CN111153638B (en) * 2020-01-08 2021-11-26 湖州三中混凝土有限公司 C35 self-compacting concrete adopting machine-made sand and preparation method thereof
CN113135707A (en) * 2021-03-18 2021-07-20 太仓申昆混凝土有限公司 Machine-made sand self-compacting concrete
CN113307571A (en) * 2021-06-11 2021-08-27 佛冈县诚康商品混凝土有限公司 Super slump retaining concrete containing machine-made sand and preparation method thereof
CN113773021A (en) * 2021-09-23 2021-12-10 重庆中科建筑科技(集团)有限公司 Self-compacting concrete and preparation method thereof
CN115838266A (en) * 2022-12-01 2023-03-24 保利长大工程有限公司 Machine-made sand concrete and preparation method thereof

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