CN113232155A - Design method of recycled aggregate concrete mixing proportion - Google Patents
Design method of recycled aggregate concrete mixing proportion Download PDFInfo
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- CN113232155A CN113232155A CN202110387401.7A CN202110387401A CN113232155A CN 113232155 A CN113232155 A CN 113232155A CN 202110387401 A CN202110387401 A CN 202110387401A CN 113232155 A CN113232155 A CN 113232155A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of construction of recycled concrete and products thereof, in particular to a design method of a recycled aggregate concrete mix proportion, aiming at the problem that a proper mix proportion cannot be designed by using JGJ55-2011 'design rule of a common concrete mix proportion', the following scheme is proposed, and the design method comprises the following steps: s1: designing the gradation of the recycled coarse aggregate according to the Standard of the quality and inspection method of the sand and the stone for the common concrete; s2: setting the design strength of the recycled aggregate concrete to be prepared, and determining the particle size and slump of the recycled coarse aggregate; s3: and determining the water consumption of the unit recycled aggregate concrete on the basis of a corresponding table of common concrete mix proportion design rules consulted according to the slump required by construction and the maximum particle size of the coarse aggregate. The invention determines the mixing proportion of the recycled aggregate concrete by using the free water cement ratio, can greatly reduce the standard deviation, saves the cement consumption and the production cost, and is beneficial to popularization and use.
Description
Technical Field
The invention relates to the field of construction of recycled concrete and products thereof, in particular to a design method of recycled aggregate concrete mixing proportion.
Background
At present, China is in the process of large-scale urbanization construction, the construction industry faces two problems of construction waste treatment and sandstone resource shortage, and according to statistics, the construction waste produced in cities of China is about 24 hundred million tons each year, and accounts for 40 percent of the total quantity of the urban waste. The total amount of the waste concrete in the construction waste is the largest and reaches 30-40%. In addition, with the rapid development of the construction industry, the demand of natural sandstone resources is increasing. In 2012, the building area of China reaches 98.6427 hundred million square meters, and the average material consumption index of residential engineering indicates that the sand consumption is about 0.4-0.7 ton/square meter, the stone consumption is about 0.6-1 ton/square meter, the annual sand consumption is about 49 million tons, and the stone consumption is about 69 million tons. Researches such as Jiangxiao and the like indicate that natural sand resources are in short supply day by day in most areas in China, the price of the sand is higher when the sand is used in a peak, even no natural sand is provided, the process of urbanization construction is influenced under the condition that a sand gap is huge, and even the quality safety of buildings is seriously influenced by using sea sand in some coastal areas.
In the prior art, when recycled aggregate concrete is prepared by recycled aggregate, a matching design ratio is generally JGJ55-2011 'design rule for the mixing ratio of common concrete', the standard is only designed for the concrete of common aggregate, and for the recycled aggregate, particularly the concrete prepared by low-quality recycled aggregate, due to the particularity of the recycled aggregate, the mixing ratio designed according to the standard is particularly added with recycled micro powder when the mixing ratio of the recycled aggregate, the water consumption, the standard deviation of the concrete and the like is poor, and a proper mixing ratio cannot be designed, so that a design method for the mixing ratio of the recycled aggregate concrete is provided for solving the problems.
Disclosure of Invention
The invention aims to solve the defect that a proper mixing ratio cannot be designed by using JGJ55-2011 'design rule for common concrete mixing ratio' in the prior art, and provides a design method for the mixing ratio of recycled aggregate concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
a design method of recycled aggregate concrete mixing proportion comprises the following steps:
s1: designing the gradation of the recycled coarse aggregate according to the Standard of the quality and inspection method of the sand and the stone for the common concrete;
s2: setting the design strength of the recycled aggregate concrete to be prepared, and determining the particle size and slump of the recycled coarse aggregate;
s3: determining the water consumption of unit recycled aggregate concrete on the basis of a corresponding table of 'common concrete mix proportion design rules' consulted according to the slump required by construction and the maximum particle size of coarse aggregate, and correspondingly increasing 5% to the final purified water consumption on the basis;
s4: carrying out actual measurement on the water absorption of the recycled coarse aggregate and the recycled fine aggregate to obtain w1 and w2, wherein w1 and w2 are the water absorption of the recycled coarse aggregate and the recycled fine aggregate respectively;
s5: determining additional water consumption according to the measured water absorption rates of the recycled coarse aggregate and the recycled fine aggregate, wherein the additional water consumption refers to the water consumption of concrete of the water absorption capacity of the recycled aggregate;
s6: calculating the value of the water-cement ratio for reference according to the concrete strength formula according to the known design strength of the recycled concrete and the hydraulic strength grade of the used cement;
s7: according to the maximum particle size and the water-ash ratio of the coarse aggregate, according to corresponding contents of 'due technical specification of recycled concrete' and 'design rule of common concrete mixing proportion', selecting a proper sand rate, considering that the surface of the recycled coarse aggregate is rougher than natural broken stone, the sand rate has a great influence on the workability of newly mixed concrete, and increasing by 5 percent on the basis of the value of the sand rate;
s8: and determining the blending proportion of the recycled fine aggregate according to the relationship between the recycled fine aggregate and the measured value of the 28d compressive strength.
Preferably, in S1, the standard for quality and testing method of general concrete for sand and stone is a book published by the national construction industry press in 2007, which was authored by the national institutes of construction science, and the recycled coarse aggregate is derived from a building and is destroyed by the age or aging to produce waste concrete blocks, which are a main source of waste concrete blocks, waste concrete blocks produced by the transportation of municipal works and the transformation of major infrastructure, waste concrete blocks produced by commercial concrete factories, and waste concrete blocks produced by the collapse of buildings due to unexpected causes such as earthquake, typhoon, flood, etc.
Preferably, in the S2, the recycled coarse aggregate has a particle size of 26.5mm and a slump value of 75-90 mm.
Preferably, in S3, the net water consumption is the water consumption of the concrete excluding water absorbed by the recycled aggregate, and since the surface of the recycled coarse aggregate is covered by a layer of hydraulic mortar with uneven thickness, the surface of the recycled coarse aggregate which is not subjected to strengthening treatment is rough, and the influence of the granule type on the workability of fresh concrete is large.
Preferably, in S4, the water absorption rates of the recycled coarse aggregate and the recycled fine aggregate and the time are plotted, and when the water absorption rate does not change with time, the water absorption rates at this time are the water absorption rates w1 and w2 of the recycled coarse aggregate and the recycled fine aggregate.
Preferably, in S5, the additional water consumption is obtained according to the formula m1= (r 1 × m2 × w 1) + (r 2 × m3 × w 2), where m1 is the additional water consumption per cubic meter of the recycled concrete, r1 is the substitution rate of the recycled coarse aggregate, r2 is the substitution rate of the recycled fine aggregate, m1 is the usage amount of the coarse aggregate per cubic meter of the recycled concrete, m2 is the usage amount of the fine aggregate per cubic meter of the recycled concrete, w1 is the water absorption rate of the recycled coarse aggregate, and w2 is the water absorption rate of the recycled fine aggregate.
Preferably, in S6, the value of the ratio of water to ash is calculated according to the formula (W/B) = a1f 1/(f 2+ a1a2f 3), where (W/B) is the concrete water-cement ratio, a1 and a2 are gyration coefficients, and f3 is a measured value of 28d compressive strength, and f2 in the formula can be determined according to the formula f2= o3o4f3, where o3 and o4 are coefficients of pulverized coal ash influencing granulated blast furnace slag, and can be determined by statistics.
Preferably, in S6, when the measured value f3 of the 28d compressive strength is not found, it can be obtained according to the formula f3= r3 f4, wherein r3 is a margin coefficient for cement strength grade and f4 is a cement strength grade value.
Preferably, in S7, the sand rate is selected to minimize the use of cement, thereby reducing the production cost.
Preferably, in S8, the blending ratio of the recycled fine aggregate is obtained according to the formula f3= t/t1, t is an actual measured value of 28d compressive strength of the mixed fine aggregate, and t1 is a 28d reference strength of different common fine aggregates.
In the invention, the gradation of the recycled coarse aggregate is designed according to the standard of the quality and the inspection method of the sand and the stone for the common concrete, the recycled coarse aggregate is derived from the waste concrete blocks generated by demolishing the buildings due to the service life reaching the service life or due to aging, which are the main sources of the waste concrete blocks, the waste concrete blocks generated by the transportation of municipal works and the reconstruction of major infrastructure, the waste concrete blocks generated by the collapse of the buildings due to unexpected reasons such as earthquake, typhoon, flood and the like, the design strength of the recycled aggregate concrete required to be prepared is set, the particle size and the slump of the recycled coarse aggregate are determined, the particle size of the recycled coarse aggregate is limited to 26.5mm, the slump is 75-90mm, the water consumption of the unit recycled concrete is determined on the basis of the corresponding table of the design rule of the common concrete mix proportion according to the slump required by construction and the maximum particle size of the recycled aggregate, on the basis, 5% of the final pure water consumption is correspondingly increased, the recycled coarse aggregate and the recycled fine aggregate are subjected to actual measurement of water absorption rates to obtain W1 and W2, W1 and W2 are the water absorption rates of the recycled coarse aggregate and the recycled fine aggregate respectively, the additional water consumption is obtained according to a formula m1= (r 1 x m2 x W1) + (r 2 x m3 x W2), the value of the pure water-ash ratio is calculated according to a formula (W/B) = a1f 1/(f 2+ a1a2f 3), and finally the blending ratio of the recycled fine aggregate concrete is obtained according to a formula f3= t/t1 to determine the final blending ratio of the recycled aggregate concrete.
The invention determines the mixing proportion of the recycled aggregate concrete by using the free water cement ratio, can greatly reduce the standard deviation, saves the cement consumption and the production cost, and is favorable for popularization and use.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
A design method of recycled aggregate concrete mixing proportion comprises the following steps:
s1: designing the gradation of the recycled coarse aggregate according to the Standard of the quality and inspection method of the sand and the stone for the common concrete;
s2: setting the design strength of the recycled aggregate concrete to be prepared, and determining the particle size and slump of the recycled coarse aggregate;
s3: determining the water consumption of unit recycled aggregate concrete on the basis of a corresponding table of 'common concrete mix proportion design rules' consulted according to the slump required by construction and the maximum particle size of coarse aggregate, and correspondingly increasing 5% to the final purified water consumption on the basis;
s4: carrying out actual measurement on the water absorption of the recycled coarse aggregate and the recycled fine aggregate to obtain w1 and w2, wherein w1 and w2 are the water absorption of the recycled coarse aggregate and the recycled fine aggregate respectively;
s5: determining additional water consumption according to the measured water absorption rates of the recycled coarse aggregate and the recycled fine aggregate, wherein the additional water consumption refers to the water consumption of concrete of the water absorption capacity of the recycled aggregate;
s6: calculating the value of the water-cement ratio for reference according to the concrete strength formula according to the known design strength of the recycled concrete and the hydraulic strength grade of the used cement;
s7: according to the maximum particle size and the water-ash ratio of the coarse aggregate, according to corresponding contents of 'due technical specification of recycled concrete' and 'design rule of common concrete mixing proportion', selecting a proper sand rate, considering that the surface of the recycled coarse aggregate is rougher than natural broken stone, the sand rate has a great influence on the workability of newly mixed concrete, and increasing by 5 percent on the basis of the value of the sand rate;
s8: and determining the blending proportion of the recycled fine aggregate according to the relationship between the recycled fine aggregate and the measured value of the 28d compressive strength.
In this example, in S1, the standard for the quality and inspection method of ordinary concrete, sand and stone, is a book published by the national construction industry publishers in 2007, and was authored by the national institutes of construction science, the recycled coarse aggregate is derived from a building and is demolished as it reaches the service life or as it ages, to produce waste concrete blocks, which are the main source of waste concrete blocks, the transportation of municipal works, and the transformation of major infrastructure to produce waste concrete blocks, the waste concrete blocks produced by commercial concrete factories, and the waste concrete blocks produced as a result of the building collapsing due to unexpected causes such as earthquake, typhoon, flood, etc., in S2, the particle size of the recycled coarse aggregate is limited to 26.5mm, the slump is 75-90mm, in S3, the net water usage amount means the water usage amount of concrete excluding the recycled aggregate, and since the surface of the recycled coarse aggregate is wrapped with a thin and thick layer of hydraulic mortar, in S4, a graph of water absorption rates and time of the recycled coarse aggregate and the recycled fine aggregate is drawn, when the water absorption rates do not change along with the time, the water absorption rates at the time are water absorption rates W1 and W2 of the recycled coarse aggregate and the recycled fine aggregate, and in S5, additional water consumption is obtained according to a formula m1= (r 1 m 2W 1) + (r 2 m 3W 2), wherein m1 is the additional water consumption per cubic meter of recycled concrete, r1 is the substitution rate of the recycled coarse aggregate, r2 is the substitution rate of the recycled fine aggregate, m1 is the coarse aggregate usage per cubic meter of the recycled concrete, m2 is the fine aggregate per cubic meter of the recycled concrete, W1 is the coarse aggregate, W2 is the water absorption rate of the recycled fine aggregate, and S6 in the formula S6, the water absorption rate a/581 a/(5732 f) is calculated according to a/581 f/(a + 581 f), wherein (W/B) is a concrete water-cement ratio, a1 and a2 are gyration coefficients, f3 is a 28d compressive strength measured value, f2 in the formula can be determined according to a formula f2= o3o4f3, wherein o3 and o4 are coefficients of the fly ash influencing granulated blast furnace slag and can be determined by statistical data, in S6, when the 28d compressive strength measured value f3 cannot be determined, the formula f3= r3 f4 can be obtained, wherein r3 is a surplus coefficient of a cement strength grade system, f4 is a cement strength grade value, in S7, the selected sand rate must meet the requirement of using the least cement for reducing the production cost, in S8, the proportion of the recycled fine aggregate is obtained according to a formula f3= t/t1, t is a 28d compressive strength measured value of mixed fine aggregate, and t1 is a 28d standard strength of different common fine aggregates.
In the embodiment, when the anti-cracking and anti-seepage concrete is prepared, firstly, the natural dihydrate gypsum is divided into three parts in equal proportion, two parts of the natural dihydrate gypsum are respectively put into two calcining furnaces for calcining, the calcining temperature of the two calcining furnaces is respectively 600 ℃ and 140 ℃, the products of the two calcining furnaces are respectively anhydrous gypsum and semi-hydrated gypsum, the anhydrous gypsum, the semi-hydrated gypsum aluminum-phase raw material and the residual natural dihydrate gypsum which are obtained by two calcining are put into a rotary kiln for calcining at 1250 ℃ and 1300 ℃, the calcining is carried out for 20-30min to obtain blocky expanding agent clinker, a blower is used for blowing and cooling the blocky expanding agent clinker for 15min, the cooled blocky expanding agent clinker is put into a ball mill with the model number of TH10-CQM for ball milling to obtain powdery expanding agent clinker, a sieve frame with the aperture of 60-80um is used for sieving the powdery expanding agent clinker, adding powdery expanding agent clinker into a stirrer with the model of GLB-500 for fully stirring, wherein the stirring time of the stirrer is 10-15min, the rotating speed of the stirrer is 200-300r/min, keeping the rotating speed of the stirrer unchanged, adding an anti-aging agent, an accelerant, an anti-cracking agent and a cross-linking agent from the inlet of the stirrer, continuously stirring for 5min to obtain a finished expanding agent for later use, adding cement, coarse aggregates, fine aggregates, mineral admixtures and tap water in equal proportion into a stirring cylinder with the model of LQB-3000 for fully mixing and stirring, stirring the stirring cylinder at the rotating speed of 50-80r/min for 20min to obtain primary concrete, adding the primary concrete into a forced concrete stirrer for stirring, adding the obtained finished expanding agent into the forced concrete stirrer at intervals of one minute, and after fully mixing to obtain fluid concrete, injecting the fluid concrete into the template for integrated forming, opening the template after the fluid concrete is formed to obtain integrated concrete, and polishing and grinding the integrated concrete after the crack resistance and the seepage resistance of the integrated concrete are detected.
In the embodiment, the special expanding agent is added into the conventional cement concrete, so that the anti-cracking and anti-seepage performance of the concrete is effectively improved, the production cost cannot be obviously increased, and other performances of the concrete except the kang and Lei anti-seepage performance are not influenced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A design method of recycled aggregate concrete mix proportion is characterized by comprising the following steps:
s1: designing the gradation of the recycled coarse aggregate according to the Standard of the quality and inspection method of the sand and the stone for the common concrete;
s2: setting the design strength of the recycled aggregate concrete to be prepared, and determining the particle size and slump of the recycled coarse aggregate;
s3: determining the water consumption of unit recycled aggregate concrete on the basis of a corresponding table of 'common concrete mix proportion design rules' consulted according to the slump required by construction and the maximum particle size of coarse aggregate, and correspondingly increasing 5% to the final purified water consumption on the basis;
s4: carrying out actual measurement on the water absorption of the recycled coarse aggregate and the recycled fine aggregate to obtain w1 and w2, wherein w1 and w2 are the water absorption of the recycled coarse aggregate and the recycled fine aggregate respectively;
s5: determining additional water consumption according to the measured water absorption rates of the recycled coarse aggregate and the recycled fine aggregate, wherein the additional water consumption refers to the water consumption of concrete of the water absorption capacity of the recycled aggregate;
s6: calculating the value of the water-cement ratio for reference according to the concrete strength formula according to the known design strength of the recycled concrete and the hydraulic strength grade of the used cement;
s7: according to the maximum particle size and the water-ash ratio of the coarse aggregate, according to corresponding contents of 'due technical specification of recycled concrete' and 'design rule of common concrete mixing proportion', selecting a proper sand rate, considering that the surface of the recycled coarse aggregate is rougher than natural broken stone, the sand rate has a great influence on the workability of newly mixed concrete, and increasing by 5 percent on the basis of the value of the sand rate;
s8: and determining the blending proportion of the recycled fine aggregate according to the relationship between the recycled fine aggregate and the measured value of the 28d compressive strength.
2. The method of claim 1, wherein the standard "standard for quality and inspection method of sand and stone for general concrete" in S1 is a book published by the Chinese construction industry Press in 2007 and is compiled by the Chinese institute of construction science, and the recycled coarse aggregate is derived from waste concrete blocks produced by demolishing buildings due to their age or aging, which are the main source of waste concrete blocks, the transportation of municipal works and the transformation of major infrastructure to produce waste concrete blocks, waste concrete blocks produced by commercial concrete factories, and waste concrete blocks produced by the collapse of buildings due to unexpected reasons such as earthquake, typhoon, flood, etc.
3. The method for designing a recycled aggregate concrete mix proportion as recited in claim 1, wherein in S2, the recycled coarse aggregate has a particle size limited to 26.5mm and a slump value of 75-90 mm.
4. The method for designing the recycled aggregate concrete mix proportion as claimed in claim 1, wherein in S3, the net water consumption is the water consumption of the concrete excluding the water absorbed by the recycled aggregate, and since the surface of the recycled coarse aggregate is coated with a layer of hydraulic mortar with uneven thickness, the surface of the recycled coarse aggregate without strengthening treatment is rough, and the influence of the grain shape on the workability of fresh concrete is large.
5. The method of claim 1, wherein in S4, the water absorption rates of the recycled coarse aggregate and the recycled fine aggregate are plotted against time, and when the water absorption rates do not change with time, the water absorption rates are w1 and w 2.
6. The method of claim 1, wherein in S5, the additional water consumption is obtained according to the formula m1= (r 1 m2 w 1) + (r 2 m3 w 2), wherein m1 is the additional water consumption per cubic meter of recycled concrete, r1 is the substitution rate of recycled coarse aggregate, r2 is the substitution rate of recycled fine aggregate, m1 is the coarse aggregate consumption per cubic meter of recycled concrete, m2 is the fine aggregate consumption per cubic meter of recycled concrete, w1 is the water absorption of recycled coarse aggregate, and w2 is the water absorption of recycled fine aggregate.
7. The method as claimed in claim 1, wherein in S6, the value of the net water cement ratio is calculated according to the formula (W/B) = a1f 1/(f 2+ a1a2f 3), wherein (W/B) is the concrete water cement ratio, a1 and a2 are gyration coefficients, and f3 is a measured value of 28d compressive strength, and f2 in the formula can be calculated according to the formula f2= o3o4f3, wherein o3 and o4 are the coefficients of granulated blast furnace slag influenced by the fly ash and can be determined by statistics.
8. The method as claimed in claim 1, wherein in S6, when the measured value of 28d compressive strength f3 is not available, it is obtained according to the formula f3= r3 f4, wherein r3 is a margin coefficient of cement strength grade and f4 is a cement strength grade value.
9. The method as claimed in claim 1, wherein the sand ratio selected in S7 is selected to minimize the use of cement to reduce production cost.
10. The method as claimed in claim 1, wherein in S8, the blending ratio of recycled fine aggregate is obtained according to the formula f3= t/t1, t is the measured value of 28d compressive strength of mixed fine aggregate, and t1 is the 28d reference strength of different common fine aggregate.
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Application publication date: 20210810 |