CN109516733A - A kind of freeze proof pervious concrete of alkali-activated slag/flyash and preparation method thereof - Google Patents

A kind of freeze proof pervious concrete of alkali-activated slag/flyash and preparation method thereof Download PDF

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Publication number
CN109516733A
CN109516733A CN201910069972.9A CN201910069972A CN109516733A CN 109516733 A CN109516733 A CN 109516733A CN 201910069972 A CN201910069972 A CN 201910069972A CN 109516733 A CN109516733 A CN 109516733A
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weight
alkali
parts
concrete
flyash
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Inventor
边伟
马昆林
龙广成
崔毅
韩丽琴
高海贵
刘志胜
杨保平
范丽
王帅
谢建康
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Shanxi Academy Of Communications Science Co Ltd
Central South University
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Shanxi Academy Of Communications Science Co Ltd
Central South University
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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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00284—Materials permeable to liquids
    • 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
    • C04B2111/76—Use at unusual temperatures, e.g. sub-zero
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a kind of freeze proof pervious concretes of alkali-activated slag/flyash and preparation method thereof, the concrete is made of the raw material of following weight: 200 ~ 250 parts by weight of slag, 80 ~ 120 parts by weight of flyash, 130 ~ 180 parts by weight of alkali-activated carbonatite solution, 0.5 ~ 1.5 parts by weight of retarder, 1500 ~ 1700 parts by weight of 10 ~ 15 parts by weight of antifreezing agent, 10 ~ 15 parts by weight of pigment and coarse aggregate, each raw material obtain required concrete after being mixed evenly in certain sequence.Present invention pervious concrete made of alkali-activated slag/fly ash gel material, it is easily prepared, and good draining, mechanics and anti-freezing property are had both, the performance indicator requirement of properties far super " water-permeable cement concrete pavement technique regulation " (CJJ/T 135-2009)；The present invention is using slag and flyash as the primary raw material for preparing pervious concrete simultaneously, reduce cement consumption, raw material production process is low in cost, green low-carbon, energy-saving and emission-reduction, have effectively achieved the resource utilization of slag, flyash industrial waste, economic, society and obvious environment benefit.

Description

A kind of freeze proof pervious concrete of alkali-activated slag/flyash and preparation method thereof
Technical field
The present invention relates to building material technical field, specially a kind of freeze proof pervious concrete of alkali-activated slag/flyash And preparation method thereof.
Background technique
With the fast development of China's Development of China's Urbanization, many urban roads are all by reinforced concrete structures and waterproof Material is covered.Since the Common Concrete Pavement of hardening is waterproof, the circulation between rainwater and underground water is blocked, underground is caused Water level decreasing, or even can also cause urban waterlogging, it is serious to destroy city water cycle system.Permeable pavement system is as construction sponge One of the major measure in city can improve city water cycle, repair Urban Water Environment.
Currently, the basis material of pervious concrete lacks still based on ordinary portland cement there are many in the prior art Point: 1. cementing material is mainly based on cement, low strength；2. porosity is bigger, intensity is lower, mechanical property and drainage It can be difficult to take into account；3. keeping its anti-freezing property poor due to the porosity of pervious concrete, its service life is caused to greatly shorten；④ The production of raw material cement will cause energy consumption and environmental problem.
Alkali-activated carbonatite cementitious material is a kind of novel green cementitious material, and not water mixing mud, hydrated product is [AlO4]5-With [SiO4]4-The three-dimensional network type product that tetrahedral structural unit is polymerized, and be free of Ca (OH)2, with cement base gelling system Compared to more closely knit, there is many advantages, such as heat of hydration is low, intensity is high, durability is good.Alkali-activated slag/fly ash gel material Using solid waste such as slag, flyash as raw material, the dosage of portland cement is reduced, reduces and is generated because producing cement Energy consumption and environmental problem, simultaneously effective improve the resource utilization of the industrial wastes such as slag, flyash, be advantageously implemented Economic results in society and environmental protection develop in harmony.Alkali-activated slag/fly ash gel material is used to make by numerous scholars Standby all kinds of concrete, 106946509 A of patent of invention CN disclose a kind of alkali-activated carbonatite flyash/slag foam concrete and its Preparation method, the performance boost of the concrete primarily focuses on dry density and thermal coefficient, but its intensity highest is less than 5MPa, nothing Method is used for pavement engineering.
In conclusion there are shortcomings for conventional cement sill, and alkali-activated slag/fly ash gel material also has portion Therefore point defect needs to seek a kind of novel gelled material for preparing pervious concrete, can take into account draining, mechanics and freeze proof Performance, and it is able to achieve the energy-saving and emission-reduction and green low-carbon development of construction material.
Summary of the invention
In order to overcome the shortcomings and deficiencies of the prior art described above, primary and foremost purpose of the present invention is to provide a kind of alkali-activated carbonatite mine The freeze proof pervious concrete of slag/flyash.
It is a further object to provide a kind of preparation sides of freeze proof pervious concrete of alkali-activated slag/flyash Method.
To achieve the goals above, the present invention is realized using following technical scheme:
The present invention provides a kind of freeze proof pervious concretes of alkali-activated slag/flyash, and the concrete is by following weight The raw material of part proportion is made: 200~250 parts by weight of slag, 80~120 parts by weight of flyash, 130~180 weight of alkali-activated carbonatite solution Amount part, 0.5~1.5 parts by weight of retarder, 10~15 parts by weight of antifreezing agent, 10~15 parts by weight of pigment and coarse aggregate 1500~ 1700 parts by weight.
Further, the concrete is made of the raw material of following weight: 212~236 parts by weight of slag, fine coal Grey 91~101 parts by weight, 152~167 parts by weight of alkali-activated carbonatite solution, 0.5~1.5 parts by weight of retarder, 10~15 weight of antifreezing agent Measure part, 1568~1617 parts by weight of 10~12 parts by weight of pigment and coarse aggregate.
Further, the alkali-activated carbonatite solution is by sodium hydroxide, water and waterglass with weight ratio 100:(120-150): (750-800) compounding (" compounding " refers to " mixing ") forms, and the modulus of the alkali-activated carbonatite solution is 1.0~1.2, solid content 32% ~36%.
Preferably, the alkali-activated carbonatite solution is prepared by following methods: being first dissolved in 100 parts by weight of sodium hydroxide powder In the water of 120-150 parts by weight, sodium hydroxide solution is obtained after mixing evenly, then sodium hydroxide solution is added to 750-800 In the waterglass of parts by weight, alkali-activated carbonatite solution is obtained after mixing evenly.
Preferably, the modulus of the waterglass is 2.4-2.8, and the waterglass is potassium silicate water aqueous solution and/or silicic acid Sodium water aqueous solution.
Further, the coarse aggregate is to meet " highway engineering gather materials testing regulations " (JTG E42-2005) indices Single-stage match lime stone rubble, particle size range be 4.75~9.5mm.
Further, the quality of the alkali-activated carbonatite solution: flyash and slag gross mass are (0.45~0.55): 1.
Further, the flyash is to meet " flyash for cement and concrete " (GB/T 1596-2017) respectively The F class flyash of item index.
Further, the slag is to meet " for the ground granulated blast furnace slag in cement, mortar and concrete " (GB/ T18046-2017) the S95 grade blast-furnace cinder of indices.
Further, the retarder is sodium tripolyphosphate and/or sodium dihydrogen phosphate.
Further, the antifreezing agent is sodium nitrite and/or industrial sodium nitrate.
Further, the pigment is iron oxide red powder, iron oxide yellow powder and/or iron oxide brown powder.
The present invention also provides the preparation sides of the freeze proof pervious concrete of alkali-activated slag/flyash of above-mentioned raw materials proportion Method, comprising the following steps:
(1) slag, flyash, antifreezing agent and pigment are uniformly mixed and form mixed powder；
(2) coarse aggregate and part alkali-activated carbonatite solution are added in blender and are stirred evenly；
(3) mixed powder, retarder and remaining alkali-activated carbonatite that step (1) is added into the blender of step (2) again are molten Liquid continues to stir evenly, and forms the freeze proof pervious concrete of alkali-activated slag/flyash；
Part alkali-activated carbonatite solution is the 20%~30% of alkali-activated carbonatite solution total amount in the step (2).
Further, the step (2) is that coarse aggregate and part alkali-activated carbonatite solution are added in forced mixer, is opened Dynamic blender stirs 30s, and the step (3) is the mixed powder that step (1) is added into blender again, retarder and remaining Alkali-activated carbonatite solution continues to stir 150s, forms the freeze proof pervious concrete of alkali-activated slag/flyash.
The freeze proof pervious concrete of alkali-activated slag/flyash prepared by the present invention, the continuous porosity after conserving 28d are 22%~26%, coefficient of permeability is 4.57mm/s~4.81mm/s, and compression strength is 21MPa~25MPa, and freeze proof grade reaches F150 More than, properties are far beyond professional standard " water-permeable cement concrete pavement technique regulation " (CJJ/T 135-2009) Performance indicator requirement.
Compared with the prior art, technical solution of the present invention has the advantages that
(1) technical solution of the present invention makes full use of slag, flyash industrial solid castoff as test raw material, both It solves slag, the waste of land resource caused by flyash industrial solid castoff is accumulated for a long time and pollution, and reduces silicic acid The dosage of salt cement reduces the energy consumption and environmental problem generated because producing cement, meets energy-saving and emission-reduction, green low-carbon can be held The requirement of supervention exhibition.
(2) the freeze proof pervious concrete of alkali-activated slag/flyash provided by the invention mixes retarder in raw material, keeps away Exempt from the sudden strain of a muscle coagulation phenomena in preparation process, kept pervious concrete easily prepared, promotes pervious concrete construction quality；In raw material It is also mixed with antifreezing agent, effectively increases the anti-freezing property of pervious concrete, its freeze proof grade is made to reach F150 or more.
(3) compared to common water-permeable cement concrete, the freeze proof permeable coagulation of alkali-activated slag/flyash provided by the invention Soil has had both good draining, mechanics and anti-freezing property.
Detailed description of the invention
Fig. 1 is the preparation technology flow chart of the freeze proof pervious concrete of alkali-activated slag/flyash of the invention.
Fig. 2 is the permeable effect picture of the freeze proof pervious concrete of alkali-activated slag/flyash prepared by embodiment 1.
Specific embodiment
Technical solution of the present invention is described in detail combined with specific embodiments below.It is raw materials used in embodiment 1-3 It is as follows:
Flyash is the F class powder for meeting " flyash for cement and concrete " (GB/T 1596-2017) indices Coal ash, apparent density 2450kg/m3。
Slag is to meet " for the ground granulated blast furnace slag in cement, mortar and concrete " (GB/T 18046-2017) The S95 grade blast-furnace cinder of indices, apparent density 2870kg/m3。
Coarse aggregate is to meet the single-stage of " highway engineering gather materials testing regulations " (JTG E42-2005) indices with lime Stone rubble, particle size range are 4.75~9.5mm, bulk density 1600kg/m3, apparent density 2700kg/m3。
Alkali-activated carbonatite solution is compounded by sodium silicate aqueous solution, sodium hydroxide and water, specially first by the hydrogen of 100 parts by weight Sodium oxide molybdena powder is dissolved in 137 parts by weight water, obtains sodium hydroxide solution after mixing evenly, then sodium hydroxide solution is added to In the sodium silicate aqueous solution that 772 parts by weight moduluses are 2.4, alkali-activated carbonatite solution, performance indicator and change needed for being after mixing evenly It studies and point is shown in Table 1.
1 alkali-activated carbonatite solution property index of table and chemical component
Retarder is the industrial sodium tripolyphosphate (STPP) of Wuhan chemical industry of inorganic salt Co., Ltd production.
Antifreezing agent is the industrial sodium nitrite of Changsha Tang Hua Chemical trade Co., Ltd production.
Pigment is iron oxide red powder.
Embodiment 1
A kind of freeze proof pervious concrete of alkali-activated slag/flyash, every cubic meter of concrete are prepared from the following raw materials: slag 236kg, flyash 101kg, alkali-activated carbonatite solution 152kg, retarder 1.5kg, antifreezing agent 15kg, pigment 12kg and coarse aggregate 1568kg, " every cubic metre " are to estimate these raw materials according to default porosity for 25% 1 cubic meter of concrete can be made.
The preparation method of the freeze proof pervious concrete of alkali-activated slag/flyash of above-mentioned raw materials proportion, as shown in Figure 1, tool Steps are as follows for body:
(1) first slag, flyash, antifreezing agent and pigment are uniformly mixed, obtain mixed powder.
(2) 30% and coarse aggregate of alkali-activated carbonatite solution total amount are added in forced mixer, starting blender stirring After 30s, then mixed powder, retarder and the remaining alkali-activated carbonatite solution of step (1) are added thereto, continue to stir 150s, shape At the freeze proof pervious concrete of alkali-activated slag/flyash.
(3) method molding pervious concrete test specimen is rammed using artificial: alkali-activated slag/flyash of step (2) is freeze proof Into 100mm × 100mm × 100mm die trial, first layer charges to the 2/3 of die trial height two layers of charging of pervious concrete point Place is compacted with 3.5kg heavy tamping 5 times, surface of test piece is dug hair with scoop；Then it carries out the second layer to charge to Man Gaodu, use Heavy tamping 10 times compactings, ramming height is 200mm, is finally flattened.
(4) test specimen stands demoulding after 1d in the environment that temperature is 20 ± 5 DEG C, and it is 20 ± 2 DEG C that demoulding, which is placed on temperature, phase Maintenance extremely regulation age in the standard curing room for being 95% or more to humidity.
Embodiment 2
A kind of freeze proof pervious concrete of alkali-activated slag/flyash, every cubic meter of concrete are prepared from the following raw materials: slag 223kg, flyash 96kg, alkali-activated carbonatite solution 160kg, retarder 1.0kg, antifreezing agent 12kg, pigment 11kg and coarse aggregate 1593kg, " every cubic metre " are to estimate these raw materials according to default porosity for 25% 1 cubic meter of concrete can be made.
According to 1 step of embodiment (1)-, that alkali-activated slag/flyash is prepared in the identical preparation method of step (4) is freeze proof Pervious concrete, and form pervious concrete test specimen.
Embodiment 3
A kind of freeze proof pervious concrete of alkali-activated slag/flyash, every cubic meter of concrete are prepared from the following raw materials: slag 212kg, flyash 91kg, alkali-activated carbonatite solution 167kg, retarder 0.5kg, antifreezing agent 10kg, pigment 10kg and coarse aggregate 1617kg, " every cubic metre " are to estimate these raw materials according to default porosity for 25% 1 cubic meter of concrete can be made.
According to 1 step of embodiment (1)-, that alkali-activated slag/flyash is prepared in the identical preparation method of step (4) is freeze proof Pervious concrete, and form pervious concrete test specimen.
The feed proportioning of the pervious concrete of Examples 1 to 3 is as shown in table 2.
The feed proportioning summary sheet of the pervious concrete of 2 Examples 1 to 3 of table
By the resulting pervious concrete test specimen sample of above-described embodiment 1~3,3d compression strength, 7d pressure resistance are carried out respectively Degree, the test of 28d compression strength, continuous porosity, coefficient of permeability and fast freeze-thaw cyclic test, test result such as 3~4 institute of table Show, the permeable effect picture for the sample that embodiment 1 obtains is shown in Fig. 2.
Pervious concrete compressive strength test is referring to " standard for test methods of mechanical properties of ordinary concrete " (GB/T Compressive strength test test method carries out in 50081-2002)；Fast freeze-thaw cyclic test is referring to " normal concrete long-term behaviour With endurance quality test method standard " the fast jelly method in (GB/T 50082-2002) carries out.
Continuous porosity is tested as follows: (1) size of the test specimen after measuring maintenance 28d with ruler, and is counted Calculate its volume V；(2) test specimen is soaked 24 hours completely, weighs up test specimen quality m in water1；(3) by test specimen after being taken out in water, It dries surface water and is put into baking oven and dry, aerial quality m is weighed after constant weight2；(4) test specimen is calculated as follows Porosity P (ρwFor the density of water, 1g/cm is taken3):
The mechanics and drainage performance of the pervious concrete test specimen of 3 Examples 1 to 3 of table
Note: liquid gray scale is the ratio of alkali-activated carbonatite solution weight and flyash and slag total weight.
The anti-freezing property of the pervious concrete test specimen of 4 Examples 1 to 3 of table
As can be seen from Table 3, as liquid gray scale increases, the pressure resistance of the freeze proof pervious concrete of alkali-activated slag/flyash Degree reduces, and continuous porosity slightly increases, and coefficient of permeability also increases with it.When liquid gray scale is 0.45~0.55, the company of sample Continue porosity 22% or more, coefficient of permeability is in 4.57mm/s or more, and resistance to compression grade is in C20 or more.As can be seen from Table 4, real Mass loss rate after applying 150 Frozen-thawed cycleds of 1~3 sample of example is lower than 5%, and compression strength loss rate is lower than 20%, i.e., anti- Freeze grade in F150 or more.
In conjunction with table 3~4 as can be seen that the freeze proof pervious concrete of alkali-activated slag/flyash prepared by the present invention draining, Mechanics and anti-freezing property are all satisfied professional standard " water-permeable cement concrete pavement technique regulation " (CJJ/T 135-2009) neutrality It can index request.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention the range of application protection.Not Under the premise of being detached from the spirit and principles in the present invention, the present invention also has various modifications, replacement and improvement etc., these variations are equal It should be included within the scope of the present invention.

Claims (10)

1. a kind of freeze proof pervious concrete of alkali-activated slag/flyash, the concrete by following weight raw material system At: 200 ~ 250 parts by weight of slag, 80 ~ 120 parts by weight of flyash, 130 ~ 180 parts by weight of alkali-activated carbonatite solution, retarder 0.5 ~ 1.5 Parts by weight, 1500 ~ 1700 parts by weight of 10 ~ 15 parts by weight of antifreezing agent, 10 ~ 15 parts by weight of pigment and coarse aggregate.
2. concrete according to claim 1, which is characterized in that the concrete by following weight raw material system At: 212 ~ 236 parts by weight of slag, 91 ~ 101 parts by weight of flyash, 152 ~ 167 parts by weight of alkali-activated carbonatite solution, retarder 0.5 ~ 1.5 Parts by weight, 1568 ~ 1617 parts by weight of 10 ~ 15 parts by weight of antifreezing agent, 10 ~ 12 parts by weight of pigment and coarse aggregate.
3. concrete according to claim 1 or 2, which is characterized in that the alkali-activated carbonatite solution is by sodium hydroxide, Shui Heshui Glass is compounded with weight ratio 100:120-150:750-800, and the modulus of the alkali-activated carbonatite solution is 1.0 ~ 1.2, solid content It is 32% ~ 36%.
4. concrete according to claim 1 or 2, which is characterized in that the waterglass is potassium silicate aqueous solution and/or silicon Acid sodium aqueous solution.
5. concrete according to claim 1 or 2, which is characterized in that the coarse aggregate is to meet that " highway engineering is gathered materials examination Test regulation " with lime stone rubble, particle size range is 4.75 ~ 9.5mm for the single-stage of (JTG E42-2005) indices.
6. concrete according to claim 1 or 2, which is characterized in that the flyash is to meet " to be used for cement and coagulation Soil flyash " (GB/T 1596-2017) indices F class flyash.
7. concrete according to claim 1 or 2, which is characterized in that the slag be meet " for cement, mortar and Ground granulated blast furnace slag in concrete " (GB/T 18046-2017) indices S95 grade blast-furnace cinder.
8. concrete according to claim 1 or 2, which is characterized in that the retarder is sodium tripolyphosphate and/or phosphoric acid Sodium dihydrogen, the antifreezing agent are sodium nitrite and/or industrial sodium nitrate；The pigment is iron oxide red, iron oxide yellow and/or oxygen Change cologne earth.
9. the preparation method of concrete described in a kind of any one of claim 1-8, comprising the following steps:
(1) slag, flyash, antifreezing agent and pigment are uniformly mixed and form mixed powder；
(2) coarse aggregate and part alkali-activated carbonatite solution are added in blender and are stirred evenly；
(3) mixed powder, retarder and the remaining alkali-activated carbonatite solution of step (1) is added into the blender of step (2) again, after It is continuous to stir evenly, form the freeze proof pervious concrete of alkali-activated slag/flyash；
Part alkali-activated carbonatite solution described in step (2) is the 20% ~ 30% of alkali-activated carbonatite solution total amount.
10. preparation method according to claim 9, which is characterized in that the step (2) are as follows: by coarse aggregate and part alkali Excitation solution is added in forced mixer, and starting blender stirs 30s, the step (3) are as follows: stirring to step (2) again Mixed powder, retarder and the remaining alkali-activated carbonatite solution that step (1) is added in machine are mixed, continues to stir 150s, forms alkali-activated carbonatite The freeze proof pervious concrete of slag/flyash.
CN201910069972.9A 2019-01-24 2019-01-24 A kind of freeze proof pervious concrete of alkali-activated slag/flyash and preparation method thereof Pending CN109516733A (en)

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CN111763038A (en) * 2019-04-02 2020-10-13 北京恒泰岩磊科技有限公司 Ecological colorful permeable pavement material and preparation method thereof
CN110105032A (en) * 2019-05-20 2019-08-09 重庆大学 A kind of iron tailings gathers materials pervious concrete pavement material and its application method
CN110606720A (en) * 2019-10-08 2019-12-24 浙江天地环保科技有限公司 Preparation method of high-content fly ash-based water permeable brick
CN112250355A (en) * 2020-09-27 2021-01-22 山西省交通科技研发有限公司 Alkali-activated fly ash/slag recycled concrete and preparation method thereof

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Application publication date: 20190326