AU2020101154A4 - A Cementitious Material, A Concrete Prepared And Its Preparation Method - Google Patents

A Cementitious Material, A Concrete Prepared And Its Preparation Method Download PDF

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AU2020101154A4
AU2020101154A4 AU2020101154A AU2020101154A AU2020101154A4 AU 2020101154 A4 AU2020101154 A4 AU 2020101154A4 AU 2020101154 A AU2020101154 A AU 2020101154A AU 2020101154 A AU2020101154 A AU 2020101154A AU 2020101154 A4 AU2020101154 A4 AU 2020101154A4
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Australia
Prior art keywords
cementitious
steel
concrete
steel slag
slag
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AU2020101154A
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Shuisheng CAI
Xinying Chen
Xinli MU
Wen NI
Wei Wu
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Qian'an Weisheng Solid Waste Environmental Protection Industry Co Ltd
University of Science and Technology Beijing USTB
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Qianan Weisheng Solid Waste Environmental Protection Industry Co Ltd
University of Science and Technology Beijing USTB
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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
    • C04B7/00Hydraulic cements
    • C04B7/14Cements containing slag
    • C04B7/147Metallurgical slag
    • C04B7/153Mixtures thereof with other inorganic cementitious materials or other activators
    • C04B7/21Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
    • 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
    • C04B28/14Compositions 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 calcium sulfate cements
    • C04B28/142Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • 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
    • C04B2201/52High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • 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
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • 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
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641Polyacrylates; Polymethacrylates
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

of Description The invention provides a cementitious material, a concrete prepared and its preparation method. Firstly, slag, steel slag mud and industrial by-product gypsum are mixed thoroughly and ground at the dry base mass percentage of 40 ~ 60%, 20 ~ 50% and 10 ~ 30% to get a cementitious material. Secondly, this cementious material was blended with aggregate, steel fiber, water and water reducer to make slurry. Stabilized steel slag and steel fiber are used as fine aggregate and toughening material, respectively. Thirdly, the slurry is stirred and molded before cured in a humid environment at room or hot temperature to obtain super high performance concrete material with a compressive strength of higher than 130MPa and a flexural strength of higher than 40MPa. The invention solves the key problem of low hydration reactivity because most of the steel slag mud has undergone hydration reaction in the production process, so as to consume a large amount of steel slag mud, thus reducing the production costs of both steel and construction materials, and alleviating environmental pollution.

Description

Description
A cementitious material, a concrete prepared and its preparation
method
Technical Field This invention relates to the technical fields of solid waste resource utilization and building materials, specifically a steel fiber reinforced ultra-high performance concrete with steel slag mud as cementitious material and the preparation method.
Background Technology To further separate residual iron particles, wet grinding and wet deironing are carried out on steel tailing to obtain steel slag mud. The particles of steel slag mud hydrates and carbonization products are extremely fine. After stacking and drying, there are a large number of micron pores and nanopores in the particles, which will cause problems such as high dosage of water reducer and rapid slump loss during the preparation of cement.
CN101649663A disclosed a kind of steel slag concrete brick prepared with steel slag mud as cementitious material. Thereinto, steel slag mud, granulated blast furnace slag and gypsum are mixed in a certain proportion to prepare a cementitious material, which then is mixed with steel slag aggregates in a certain proportion to obtain the concrete. In this technology, a large amount of steel slag aggregates still contain extractable metallic iron, resulting in the waste of iron resources; the proportion of consumed steel slag mud is only 7-18%, which is very small.
CN101748222A discloses a treatment process of steel tailing slag, which is characterized by pressure filtration adopted for treating the water in the steel tailing slag so as to reduce the water content in the tailing slag. The tailings separated by the process are simply removed and piled up, causing new pollution to the environment.
CN103833322A discloses a method of producing concrete artificial reef by using steel slag mud and construction waste. This process uses thick and fine aggregates of construction waste, which cannot consume large amount of steel slag mud. In addition to the low consumption of steel slag mud, the maximum compressive strength at 28d under the standard curing condition is only 39.8MPa.
Description
Current problems: 1. The existing technology uses steel slag, refining slag etc. which also contains a large amount of extractable metal iron to prepare cementitious materials, resulting in the waste of iron resources.
2. There is little basic research on steel slag mud and no technology that can realize large-scale recycling. Besides, massive storage of steel slag mud not only causes great damage to the environment and waste a great deal of land resources, but also brings iron and steel enterprises enormous pressure of environmental protection. Even some technology uses steel slag mud, but the dosage is low, generally no more than 18%, otherwise it will affect the product strength, resulting in very limited application in industrial production.
3. The particles of steel slag mud hydrates and carbonization products are extremely fine. After stacking and drying, there are a large number of micron pores and nanopores in the particles, which will cause problems such as high dosage of water reducer and rapid slump loss during the preparation of cement.
Invention Summary: invention is to provide a cementitious material, a concrete prepared and its preparation method, so as to solve the technical problems in the prior art.
For the above purpose, the technical scheme adopted by the invention is as follows:
A cementitious material, characterized in that it comprises slag of 40 ~ 60%, steel slag mud of 20 ~ 50% and gypsum of 10 ~ 30%, calculated by mass percent.
The said gypsum is desulfurized gypsum from power plant.
The said steel slag mud is fine silt with a particle size of less than 0.075mm produced by wet grinding, wet deironing and purification of steel slag.
A concrete prepared from a cementitious material, characterized in that its raw materials comprises the cementitious material, aggregate, steel fiber, water and water reducer.
Description
The said aggregate is fine sand with a particle size of 0.075 ~ 3mm produced by wet grinding, wet deironing and purification of steel slag.
The said steel fiber conforms to YBT151-1999 Steelfibersforfiberreinforced. Preferably, linear type steel fiber with an L/D of 45 is adopted.
The said water reducer is naphthalene-based superplasticizer or polycarboxylate superplasticizer.
The said slag is granulated blast furnace slag conforming to GB/T18046-2008 Ground granulatedblastfurnaceslag usedfor cement and concrete.
The said industrial by-product gypsum is desulfurized gypsum from power plant conforming to GB/T 37785-2019 Flue gas desufurization gypsum.
A method for preparing concrete from the said cementitious material, characterized in that it includes the following steps:
(1) Mix the slag, steel slag mud and gypsum, all ground, to get a cementitious material;
(2) Evenly mix the said cementitious material with aggregate and water reducer;
(3) Pouring;
(4) Curing.
The grinding in Step (1) means separate grinding or mix grinding of slag, steel slag mud and gypsum to a specific surface area of 500~700m 2/kg.
The invention realizes the replacement of cement in concrete with the all-solid waste system, maximizing the consumption of steel slag mud and other solid waste in metallurgical industry, thus providing a new idea for solving the problem of large storage of steel slag mud and the production of ultra-high performance concrete.
Compared with prior art, the invention has the following advantages:
Description
1. Wet deironed steel slag, which is difficult to be used, is one of the main components of cementitious material, and also used as aggregate. Therefore, a large amount of steel slag mud is consumed, thus avoiding the resource waste and environmental pollution, and overcoming the defect of less than 18% of addition of steel slag mud in traditional process. 2. The mass production and tight association of nano-hydrates is a major contributor to high strength of materials. The extremely low water-binder ratio of the system and the close aggregation of a large number of hydration products make the harmful pores above micron level close to zero in the material, so does the harmless nano porosity, so the near-zero total porosity endows the material with high strength.
3. The reinforcement role of steel fiber and the self-toughening function of crystal whiskers of Nano diameter, needle bar shape double salt mineral within the materials make the compressive strength of ultra-high performance concrete containing steel slag mud higher than 130MPa and the flexural strength higher than MPa. Moreover, it overcomes the problems such as high dosage of water reducer and rapid slump loss during the preparation of cement due to the large number of micron pores and nanopores in the particles of steel slag mud.
Detailed Description of the Presently Preferred Embodiments Although exemplary embodiments of the invention are shown below, it should be understood that the invention may be embodied in various forms and not be limited by the embodiments described here. Rather, these embodiments are provided to help with a more thorough understanding of the disclosure and full communication of the scope of the disclosure to the technical staff in this field.
The invention is described in detail below in combination with the embodiment.
Embodiment 1 A kind of concrete whose cementitious material is prepared from the following raw materials calculated at mass percent: slag of 55.9%, dry base steel slag mud of 27.9%, and desulfurized gypsum 16.1%. They were mixed and ground to the specific surface area of 560m 2 /kg; in the concrete, cementitious material, aggregate, steel fiber and water account for 38.1%, 49.8%, 6.5% and 5.4%, respectively. The concrete bulk density is 2930kg/m3, and water reducer accounts for 5.5oo of cementitious material. The aggregate is fine sand separated from the steel slag mud, (hereinafter referred to as steel slag sand), with a particle size of 0.075-3mm. The water reducer is a solid
Description
polycarboxylate superplasticizer, and the steel fiber adopts a linear steel fiber with an L/D of 45.
Concrete mix ratio is shown in the following table:
Table 1 Concrete mix ratio in embodiment 1 (concrete material consumption per cubic meter: kg/m 3 )
Cementitious material Steel slag Steel fiber Water Water Slag Steel FGD sand reducer slag mud gypsum 625.0 312.1 180.1 1459.6 193.1 160.0 6.1
According to the mix ratio shown in the above table, place the raw materials in a concrete mixer and mix them evenly. Pour them into a mold at temperature of 205°C and relative humidity of not less than 60%, and then place on a concrete vibration table for vibration molding. After molding, place the test block under the standard curing conditions of 20°C ±2C and the relative humidity of not less than 95% for curing for 24 hours before mold removal. Then, place it in a constant temperature and humidity curing box with curing temperature of 20°C ±2°C and relative humidity of not less than 95% for curing until the curing age of 28d, then test its compressive strength and flexural strength, which is 115.3MPa and 30.25MPa, respectively.
With the same mix ratio, place the test block after molding in a constant temperature and humidity curing box with curing temperature of 42±2°C and relative humidity of not less than 95% for curing until the curing age of 28d, then test its compressive strength and flexural strength, which is 135.53MPa and 42.8MPa, respectively.
Embodiment 2 A kind of concrete whose cementitious material is prepared from the following raw materials calculated at mass percent: slag of 48.3%, steel slag mud of 38.9% and desulfurized gypsum of 12.8%. They are mixed and ground to the specific surface area of 610m 2 /kg; in the concrete, cementitious material, aggregate, steel fiber and water accounts for 46.0%, 42.1%, 5.5% and 6.5%, respectively. The concrete bulk
Description
density is 2853kg/m 3, and water reducer mass accounts for 5.7%oof cementitious material. The aggregate is the fine sand with a particle size of 0.075-3mm separated from the steel slag mud. The water reducer is naphthalene-based superplasticizer. The steel fiber adopts the linear steel fiber with an L/D of 45.
Concrete mix ratio is shown in the following table:
Table 2 Concrete mix ratio in embodiment 2 (concrete material consumption per cubic meter: kg/m 3 )
Cementitious material Steel slag Steel fiber Water Water Slag Steel FGD sand reducer slag mud gypsum 633.6 510.0 167.8 1200.2 157 185 7.5
According to the mix ratio shown in the above table, place the raw materials in a concrete mixer and mix them evenly. Pour them into a compressive strength mold of 150mm X 150mm X 150mm and a flexural strength mold of 150mm X 150mm X 600mm at temperature of 20±5°C and relative humidity of not less than 60%, and then place on a concrete vibration table for vibration molding. After molding, place the test block under the standard curing conditions of 20°C ±2°C and the relative humidity of not less than 95% for curing for 24 hours before mold removal. Then, place it in a constant temperature and humidity curing box with curing temperature of °C ±2C and relative humidity of not less than 95% for curing until the curing age of 28d, then test its compressive strength and flexural strength, which is 140.7MPa and 45.2MPa, respectively.
Embodiment 3 A kind of concrete whose cementitious material is prepared from the following raw materials calculated at mass percent: slag of 43.0%, steel slag mud of 44.6% and desulfurized gypsum of 12.4%. They are mixed and ground to the specific surface area of 580m 2 /kg; in the concrete, cementitious material, aggregate, steel fiber and water account for 44.1%, 46.3%, 3.3% and 6.3%, respectively. The concrete bulk density is 2852kg/m 3 , and water reducer accounts for 5.6%o of cementitious material mass. The aggregate is the fine sand with a particle size of 0.0753mm separated from the steel slag mud. The water reducer is polycarboxylate superplasticizer. The steel fiber adopts the linear steel fiber with an L/D of 45.
Description
Concrete mix ratio is shown in the following table:
Table 3 Concrete mix ratio in embodiment 3 (concrete material consumption per cubic meter: kg/m 3 )
Cementitious material Steel slag Steel Water Water Slag Steel FGD sand fiber reducer slag mud gypsum 625.0 312.1 180.1 1459.6 193.1 160.0 6.1
According to the mix ratio shown in the above table, place the raw materials in a concrete mixer and mix them evenly. Pour them into a mold at temperature of 205°C and relative humidity of not less than 60%, and then place on a concrete vibration table for vibration molding. After molding, place the test block under the standard curing conditions of 20°C ±2C and the relative humidity of not less than 95% for curing for 24 hours before mold removal. Then, place it in a constant temperature and humidity curing box with curing temperature of 20°C ±2°C and relative humidity of not less than 95% for curing until the curing age of 28d, then test its compressive strength and flexural strength, which is 147.2MPa and 42.2MPa, respectively.
Embodiment 4
A kind of concrete whose cementitious material is prepared from the following raw materials calculated at mass percent: slag of 55.5%, steel slag mud of 30.0% and desulfurized gypsum of 14.5%. They are mixed and ground to the specific surface area of 600m 2 /kg; the said steel slag mud is the fine silt part with a particle size of less than 0.075mm generated from the wet grinding, wet deironing and purification process of steel slag. In the concrete, cementitious material, aggregate, steel fiber and water account for 46.2%, 43.0%, 4.2% and 6.6%, respectively. The concrete bulk density is 2807kg/m 3 , and water reducer mass accounts for 6.0%oof cementitious material. The aggregate is the fine sand with a particle size of 0.0753mm separated from the steel slag mud. The water reducer is naphthalene-based superplasticizer. The steel fiber adopts the linear steel fiber with an L/D of 45. Concrete mix ratio is shown in the following table:
Description
Table 4 Concrete mix ratio in embodiment 4 (concrete material consumption per cubic meter: kg/m 3
) Cementitious material Steel slag Steel fiber Water Water slag FGD sand reducer Steel gypsum slag mud 720.0 391.0 186.4 1207.0 117.8 185.0 7.8
According to the mix ratio shown in the above table, place the raw materials in a concrete mixer and mix them evenly. Pour them into a mold at temperature of 205°C and relative humidity of not less than 60%, and then place on a concrete vibration table for vibration molding. After molding, place the test block under the standard curing conditions of 20°C ±2C and the relative humidity of not less than 95% for curing for 24 hours before mold removal. Then, place it in a constant temperature and humidity curing box with curing temperature of 20°C ±2°C and relative humidity of not less than 95% for curing until the curing age of 28d, then test its compressive strength and flexural strength, which is 130.2MPa and 43.7MPa, respectively.
The above mentioned is only a better specific implementation method of the invention, but the scope of protection of the invention is not limited to this. Any change or replacement within the scope of the technology that can be easily thought of by a technician familiar with the technical field disclosed by the invention shall be covered within the scope of protection of the invention. Therefore, the scope of protection of the invention shall be subject to that of the claims.

Claims (10)

Claims
1. A cementitious material, characterized in that it comprises slag of 40 ~ 60%, steel slag mud of 20 ~ 50% and gypsum of 10 ~ 30%, calculated by mass percent.
2. The cementitious material mentioned in claim 1, characterized in that the said gypsum is desulfurized gypsum from power plant.
3. The cementitious material mentioned in claim 1, characterized in that the said steel slag mud is fine silt with a particle size of less than 0.075mm produced by wet grinding, wet deironing and purification of steel slag.
4. The concrete made of the cementitious material mentioned in claim 1, characterized in that it comprises the said cementitious material, aggregate, steel fiber, water and water reducer; of which calculated by mass percent the first four account for 35 ~ 50%, 35 ~ 5 0 %, 3 ~ 8% and 5 ~ 9%, respectively, and the water reducer accounts for 0.5 ~ 1% of the mass of the cementitious material.
5. The concrete mentioned in claim 4, characterized in that the said aggregate is fine sand with a particle size of 0.075 ~ 3mm produced by wet grinding, wet deironing and purification of steel slag.
6. The concrete mentioned in claim 4, characterized in that the said steel fiber conforms to YBT151-1999 Steelfibersforfiberreinforced Concrete.
7. The concrete mentioned in claim 4, characterized in that the said steel fiber is linear type, with an L/D of 45, which acts synergistically with the steel slag mud.
8. The concrete mentioned in claim 4, characterized in that the said water reducer is naphthalene-based superplasticizer or polycarboxylate superplasticizer.
9. The preparation method of the concrete mentioned in claim 4, characterized in that it includes the following steps:
(1) Mix the slag, steel slag mud and gypsum, all ground, to get a cementitious material;
(2) Evenly mix the said cementitious material with aggregate and water reducer;
Claims
(3) Pouring;
(4) Curing.
10. The preparation method of concrete as mentioned in claim 9, characterized in that the grinding in Step (1) means separate grinding or mix grinding of slag, steel slag mud and gypsum to specific surface area of 500~700m 2/kg.
AU2020101154A 2020-06-26 2020-06-26 A Cementitious Material, A Concrete Prepared And Its Preparation Method Active AU2020101154A4 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111892340A (en) * 2020-07-31 2020-11-06 湖北工业大学 Preparation method of low-cost steel slag carbonized brick

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111892340A (en) * 2020-07-31 2020-11-06 湖北工业大学 Preparation method of low-cost steel slag carbonized brick

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