CN118063169A - Environment-friendly high-performance concrete and preparation method thereof - Google Patents
Environment-friendly high-performance concrete and preparation method thereof Download PDFInfo
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- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000004567 concrete Substances 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 51
- 239000004917 carbon fiber Substances 0.000 claims abstract description 51
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 12
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 10
- 244000005700 microbiome Species 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 27
- 239000008367 deionised water Substances 0.000 claims description 25
- 229910021641 deionized water Inorganic materials 0.000 claims description 25
- 239000002131 composite material Substances 0.000 claims description 24
- 239000002068 microbial inoculum Substances 0.000 claims description 23
- 230000000813 microbial effect Effects 0.000 claims description 22
- 239000002253 acid Substances 0.000 claims description 21
- 238000003763 carbonization Methods 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 19
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 18
- 238000009210 therapy by ultrasound Methods 0.000 claims description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 238000010992 reflux Methods 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 9
- CYDQOEWLBCCFJZ-UHFFFAOYSA-N 4-(4-fluorophenyl)oxane-4-carboxylic acid Chemical compound C=1C=C(F)C=CC=1C1(C(=O)O)CCOCC1 CYDQOEWLBCCFJZ-UHFFFAOYSA-N 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 claims description 7
- 239000001527 calcium lactate Substances 0.000 claims description 7
- 229960002401 calcium lactate Drugs 0.000 claims description 7
- 235000011086 calcium lactate Nutrition 0.000 claims description 7
- 229940041514 candida albicans extract Drugs 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 239000001540 sodium lactate Substances 0.000 claims description 7
- 229940005581 sodium lactate Drugs 0.000 claims description 7
- 235000011088 sodium lactate Nutrition 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- 239000012137 tryptone Substances 0.000 claims description 7
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 7
- 239000012498 ultrapure water Substances 0.000 claims description 7
- 239000012138 yeast extract Substances 0.000 claims description 7
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 6
- 229910017604 nitric acid Inorganic materials 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 241000192023 Sarcina Species 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
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- 229910052751 metal Inorganic materials 0.000 claims description 5
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- 238000002156 mixing Methods 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000008030 superplasticizer Substances 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 5
- 241000193755 Bacillus cereus Species 0.000 claims description 4
- 238000012258 culturing Methods 0.000 claims description 4
- 230000020477 pH reduction Effects 0.000 claims description 4
- 241000588986 Alcaligenes Species 0.000 claims description 3
- 239000002054 inoculum Substances 0.000 claims description 2
- 229960002668 sodium chloride Drugs 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 16
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- 241000894006 Bacteria Species 0.000 abstract description 5
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 3
- 230000001580 bacterial effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000010276 construction Methods 0.000 description 9
- 239000011083 cement mortar Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
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- DDBREPKUVSBGFI-UHFFFAOYSA-N phenobarbital Chemical compound C=1C=CC=CC=1C1(CC)C(=O)NC(=O)NC1=O DDBREPKUVSBGFI-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 241000196324 Embryophyta Species 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 241000193395 Sporosarcina pasteurii Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000037358 bacterial metabolism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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Classifications
-
- 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
- C04B28/04—Portland cements
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
Landscapes
- 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)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
The invention discloses an environment-friendly high-performance concrete and a preparation method thereof in the technical field of concrete, wherein the concrete comprises the following components: water, cement, river sand, microorganism carbonized recycled aggregate, polycarboxylate water reducer and modified carbon fiber admixture; the invention soaks the regenerated aggregate prepared by the waste concrete in the bacterial liquid, so that bacteria are adsorbed in the microcracks and the pores, carbonate is generated by the special enzymolysis characteristic of the bacteria, the microcracks and the pores are filled, and the surface area of the carbon fiber is increased by modifying the surface of the carbon fiber, so that the cohesiveness between the carbon fiber and a concrete matrix is improved, the porosity and the water absorption rate of the concrete are further reduced, and the performance of the concrete is improved.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to environment-friendly high-performance concrete and a preparation method thereof.
Background
Under the situation of rapid development of the building industry, the demand of concrete is increased, and the demand of corresponding sand and stone is also increased, but natural sand and stone resources are limited, and the natural environment is damaged in the process of mining sand and stone; meanwhile, as the urban rate continuously rises, old community removal maintenance projects increase, a large amount of construction waste is generated by the old building removal, the resource utilization rate of the construction waste is always at a low level, people usually adopt a long-term stacking or burying mode for treatment, the environment is greatly threatened, and the recycling of resources is not facilitated.
In recent years, green construction is carried out in the field of engineering construction, the in-situ recycling of construction demolishd garbage is promoted, and classification management, source reduction, resource utilization and the like of construction garbage are implemented; the recycling of the recycled aggregate is a key step for realizing the recycling of the construction waste, and the recycling of the recycled aggregate can also effectively solve a series of problems such as shortage of construction resources; however, the recycled aggregate has various performances lower than that of the natural aggregate due to the adhesion of the old cement mortar, so that the treatment of the adhesion mortar of the recycled aggregate and the improvement of the mechanical property of the recycled aggregate are key to realizing the recycling of construction waste.
The prior art mainly has the following problems: the recycled aggregate is used as a building material, the residual old cement mortar and the new cement mortar have low bonding strength, the old cement mortar has higher porosity and water absorption, and the recycled concrete prepared by using the recycled aggregate is easy to form a plurality of weak interfaces in the concrete, has negative effects on the mechanical property and durability of the concrete, and further affects the performance of the recycled concrete.
Disclosure of Invention
Aiming at the situation, the invention provides the environment-friendly high-performance concrete and the preparation method thereof, and aims to solve the problems of low bonding strength, high porosity and high water absorption rate of recycled aggregate.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The invention provides environment-friendly high-performance concrete, which comprises the following components in parts by weight: 154-174 parts of water, 365-400 parts of cement, 550-650 parts of river sand, 1050-1450 parts of microbial carbonized recycled aggregate, 40-60 parts of polycarboxylate superplasticizer and 80-110 parts of modified carbon fiber admixture.
Preferably, the preparation method of the microbial carbonized recycled aggregate specifically comprises the following steps:
① Adding tryptone, yeast extract powder solution, sodium chloride, calcium lactate, calcium nitrate and sodium lactate into ultrapure water, and uniformly stirring to prepare LB culture solution;
② Adding a composite microbial inoculum into the LB culture solution prepared in the step ①, sufficiently shaking, and culturing at a constant temperature of 30 ℃ for 48 hours in a sealing manner to obtain a composite microbial inoculum culture solution;
③ Waste concrete is taken as a raw material, wood dust, glass and metal impurities are removed, and crushed and sieved by a jaw crusher to obtain recycled aggregate with the grain size distribution of 4.75-26.5 mm;
④ And (3) putting the recycled aggregate prepared in the step ③ into the composite microbial inoculum culture solution prepared in the step ②, soaking for 24 hours, taking out, placing in a flowing carbonization chamber with the humidity of 60-75% and the temperature of 23-27 ℃, injecting CO 2 gas into the flowing carbonization chamber by utilizing a flowing carbonization method, and obtaining the microbial carbonization recycled aggregate after the CO 2 concentration is 20-50% and the flow rate is 4-5L/min and 5-6 hours.
Preferably, in step ①, the LB culture solution comprises the following components in parts by weight: 1000-1200 parts of ultrapure water, 10-12 parts of tryptone, 5-7 parts of yeast extract powder solution, 10-11 parts of sodium chloride, 5-6 parts of calcium lactate, 2-3 parts of calcium nitrate and 1-2 parts of sodium lactate.
Preferably, in step ②, the composite microbial inoculum culture solution is composed of a composite microbial inoculum and an LB culture solution, and the composite microbial inoculum is composed of bacillus cereus, sarcina barbita and bacillus alcalophilus.
Preferably, in step ②, the concentration ratio of bacillus cereus, sarcina barbita and bacillus alcaligenes in the composite microbial inoculum is 2-2.5:1-2:2-2.5.
Preferably, in step ②, the concentration of the bacillus cereus in the complex microbial inoculant solution is 1×10 8-2×108 cells/mL.
Preferably, the preparation method of the modified carbon fiber admixture specifically comprises the following steps:
a. adding carbon fiber into acetone, performing ultrasonic treatment for 30-40min, pouring into a flask, refluxing in a water bath at a constant temperature of 60-80 ℃ for 20-24h, filtering, taking out, washing with deionized water and absolute ethyl alcohol for 6 times by oscillation, and drying to obtain desized carbon fiber;
b. Adding the desized carbon fiber prepared in the step a into a mixed strong acid solution, carrying out water bath acidification reaction at the constant temperature of 70-80 ℃ for 4-5 hours, taking out, repeatedly oscillating and washing with deionized water and absolute ethyl alcohol until the washed solution is neutral, and drying to obtain the acid oxidized carbon fiber;
c. Adding the acid oxidized carbon fiber prepared in the step b into a silane coupling agent solution, carrying out ultrasonic treatment for 60-80min, refluxing for 4 hours at the constant temperature of 80 ℃, filtering, taking out, oscillating and washing for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain silanized carbon fiber;
d. Adding graphene oxide into N, N-dimethylformamide, magnetically stirring for 10-20min, adding the silanized carbon fiber prepared in the step c, carrying out ultrasonic treatment for 1-2h, refluxing at 105 ℃ for 6-8h, taking out, carrying out oscillation cleaning for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain the modified carbon fiber admixture.
Preferably, in step a, the mass concentration of carbon fibers in acetone is 0.0267-0.03kg/L;
Preferably, in the step b, the mixed strong acid solution is prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to a volume ratio of 1:1;
Preferably, in the step b, the mass concentration of the desized carbon fiber in the mixed strong acid solution is 0.0253-0.028kg/L;
preferably, in the step c, the silane coupling agent solution is prepared from 150-200L of absolute ethyl alcohol, 35-40L of silane coupling agent and 15-20L of deionized water;
preferably, in the step c, the mass concentration of the acid oxidized carbon fiber in the silane coupling agent solution is 0.0175-0.02kg/L;
preferably, in step d, the mass concentration of graphene oxide in N, N-dimethylformamide is 0.0075-0.01kg/L.
The invention also provides a preparation method of the environment-friendly high-performance concrete, which comprises the following steps:
S1, adding a polycarboxylate water reducer and a modified carbon fiber admixture into water, uniformly stirring, and performing ultrasonic treatment for 60-70min to obtain a modified carbon fiber admixture dispersion;
and S2, uniformly stirring the microbial carbonized regenerated aggregate and the river sand, adding the modified carbon fiber admixture dispersion prepared in the step S1, fully stirring, adding cement, the modified carbon fiber admixture dispersion and water, and continuously stirring to obtain the environment-friendly high-performance concrete.
The beneficial effects obtained by the invention are as follows:
The invention provides a method for modifying the recycled aggregate and the modified carbon fiber surface grafting by utilizing microorganism carbonization, which realizes the reduction of the porosity and the water absorption of the recycled aggregate, thereby realizing the technical effects of enhancing the bonding strength of cement mortar and the recycled aggregate and improving the performance of concrete; immersing the recycled aggregate in the bacterial liquid to enable bacteria to be adsorbed in the micro-cracks and pores of the recycled aggregate, wherein the bacteria promote CO 2 in the air to react to generate through the special enzymolysis characteristic Under alkaline conditions,/>React with OH – to form/>The cations such as Ca 2+ in the continuous chelating environment generate carbonate to fill the pores and microcracks, thereby playing a role in sealing; the carbon fiber has the characteristics of high hardness, high strength, light weight and the like, but has few surface active functional groups, is chemically inert, has poor cohesiveness with a concrete matrix and cannot effectively play the functional role of the carbon fiber, and the surface area of the carbon fiber is increased by grafting graphene oxide onto the surface of the carbon fiber through modifying the surface of the carbon fiber, so that a large number of oxygen-containing functional groups are increased, and can be used as nucleation centers of hydration products to attract the hydration products to deposit and aggregate, and then the surface bacterial metabolism of the recycled aggregate is combined to play a role of synergism, so that the porosity and the water absorption rate are greatly reduced, and the performance of the concrete is improved; according to the invention, the CO 2 gas is injected, so that the content of CO 2 in the environment is increased, the metabolic reaction of bacteria is accelerated, and the formation of carbonate is accelerated; and the cost is reduced from the material selection, the utilization rate of the waste concrete is greatly improved, and the method plays a positive role in environmental protection.
Drawings
FIG. 1 is an SEM image of concrete prepared in example 1;
FIG. 2 is a graph showing slump test results of the concrete prepared in example 1 and comparative examples 1 to 4;
FIG. 3 is a graph showing the results of compressive strength tests of the concrete prepared in example 1 and comparative examples 1 to 4;
FIG. 4 is a graph showing the results of capillary water absorption tests of the concrete prepared in example 1 and comparative examples 1 to 4.
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the present application. The preferred methods and materials described herein are illustrative only and should not be construed as limiting the application.
The experimental methods in the following examples are all conventional methods unless otherwise specified; the test materials and test strains used in the examples described below, unless otherwise specified, were commercially available.
The sources of reagents used in the examples are as follows:
cement, ordinary Portland cement, purchased from a cement plant in Taixing city, jiangsu province;
river sand with apparent density of 2600kg/m 3, mud content of 0.4% and fineness modulus of 2.7 is purchased from a certain sand and stone factory in Taixing city of Jiangsu province;
Polycarboxylate water reducer, available from certain building materials Co.Ltd in Taixing city of Jiangsu province
Carbon fiber with a length of 6mm and a density of 1.76g/cm 3, a tensile strength of 3.53MPa, available from environmental protection technology Co., taixing, jiangsu province
Acetone, casNo:67-64-1, cat No.: 40064486, available from China medicine group, inc.;
Absolute ethanol, casNo:64-17-5, available from Nanjing chemical agents Co., ltd;
concentrated sulfuric acid, mass fraction 95%, casNo:7664-93-9, cat: 10021660, available from China medicine group, inc.;
Concentrated nitric acid with mass fraction of 65%, casNo:7697-37-2, cat No.: 10014518, available from China medicine group, inc.;
N, N-dimethylformamide, casNo:68-12-2, cat No.: 40072385, available from China medicine group, inc.;
Graphene oxide, purchased from Jiangsu certain nanomaterials limited;
silane coupling agent, model KH550, purchased from Shanghai Jiedang chemical technology Co., ltd;
bacillus coleus Sutcliffiella cohnii, strain accession number: CGMCC13671 is derived from China general microbiological culture collection center;
Sarcina papyrifera Sporosarcina pasteurii, strain deposit number: CGMCC13687; is derived from China general microbiological culture collection center;
Bacillus alcaligenes Bacillus alcalophilus, strain accession number: CGMCC13604 is derived from China general microbiological culture collection center.
Example 1
An environment-friendly high-performance concrete comprises the following components in parts by weight: 154 parts of water, 365 parts of cement, 550 parts of river sand, 1050 parts of microbial carbonized recycled aggregate, 40 parts of polycarboxylate superplasticizer and 80 parts of modified carbon fiber additive.
The preparation method of the microbial carbonized regenerated aggregate specifically comprises the following steps:
① Adding 500g of tryptone, 250mL of yeast extract powder solution, 500g of sodium chloride, 250g of calcium lactate, 100g of calcium nitrate and 50g of sodium lactate into 50L of ultrapure water, and uniformly stirring to prepare LB culture solution;
② Adding 10g of composite microbial inoculum into the LB culture solution prepared in the step ①, sufficiently shaking, and culturing at the constant temperature of 30 ℃ for 48 hours in a sealing manner to obtain the composite microbial inoculum culture solution;
③ Waste concrete is taken as a raw material, wood dust, glass and metal impurities are removed, and crushed and sieved by a jaw crusher to obtain recycled aggregate with the grain size distribution of 4.75-10 mm;
④ And (3) putting the recycled aggregate prepared in the step ③ into the composite microbial inoculum culture solution prepared in the step ②, soaking for 24 hours, taking out, placing in a flowing carbonization chamber with the humidity of 60% and the temperature of 23 ℃, injecting CO 2 gas into the flowing carbonization chamber by using a flowing carbonization method, and obtaining the microbial carbonization recycled aggregate after the flow rate of 4L/min and the concentration of 20% CO 2.
The preparation method of the modified carbon fiber admixture specifically comprises the following steps:
a. Adding 4kg of carbon fiber into 150L of acetone, carrying out ultrasonic treatment for 30min, pouring into a flask, refluxing in a water bath at a constant temperature of 60 ℃ for 20h, filtering, taking out, washing for 6 times by oscillating with deionized water and absolute ethyl alcohol, and drying to obtain desized carbon fiber;
b. adding 150L of the desized carbon fiber prepared in the step a into a mixed strong acid solution prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, carrying out water bath acidification reaction at the constant temperature of 70 ℃ for 4 hours, taking out, repeatedly oscillating and washing with deionized water and absolute ethyl alcohol until the washed solution is neutral, and drying to obtain the acid oxidized carbon fiber;
c. Adding the acid oxidized carbon fiber prepared in the step b into a silane coupling agent solution, carrying out ultrasonic treatment for 60min, refluxing for 4 hours at the constant temperature of 80 ℃, filtering, taking out, oscillating and washing for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain silanized carbon fiber;
The silane coupling agent solution is prepared from 150L of absolute ethyl alcohol, 35L of silane coupling agent and 15L of deionized water;
d. Adding 3kg of graphene oxide into 400LN, N-dimethylformamide, magnetically stirring for 10min, adding the silanized carbon fiber prepared in the step c, carrying out ultrasonic treatment for 1h, refluxing at 105 ℃ for 6h, taking out, carrying out oscillation cleaning for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain the modified carbon fiber admixture.
The invention also provides a preparation method of the environment-friendly high-performance concrete, which comprises the following steps:
S1, adding 4kg of a polycarboxylate water reducer and 8kg of modified carbon fiber admixture into 15.4L of water, uniformly stirring, and performing ultrasonic treatment for 60min to obtain 20L of modified carbon fiber admixture dispersion;
And S2, uniformly stirring 105kg of microorganism carbonized regenerated aggregate and 55kg of river sand, adding 10L of the modified carbon fiber admixture dispersion prepared in the step S1, fully stirring, adding 36.5kg of cement and 10L of the modified carbon fiber admixture dispersion, and continuously stirring to obtain the environment-friendly high-performance concrete.
In the embodiment, a scanning electron microscope is used for observing the microscopic morphology of the prepared concrete, fig. 1 is an SEM image of the concrete prepared in the embodiment 1, fig. a is a microscopic morphology of the surface of the modified carbon fiber, and it can be seen from fig. a that grooves appear after the carbon fiber is modified, and hydration products are formed; the graph B shows the microscopic morphology of the interface between the modified carbon fiber and the concrete matrix, and the graph B shows that the concrete has less cracks and tight combination.
Example 2
An environment-friendly high-performance concrete comprises the following components in parts by weight: 174 parts of water, 400 parts of cement, 650 parts of river sand, 1450 parts of microbial carbonized recycled aggregate, 60 parts of polycarboxylate superplasticizer and 110 parts of modified carbon fiber additive.
The preparation method of the microbial carbonized regenerated aggregate specifically comprises the following steps:
① 600g of tryptone, 350mL of yeast extract powder solution, 550g of sodium chloride, 300g of calcium lactate, 150g of calcium nitrate and 100g of sodium lactate are added into 60L of ultrapure water, and uniformly stirred to prepare LB culture solution;
② 15g of composite microbial inoculum is added into the LB culture solution prepared in the step ①, and the mixture is fully shaken, and is cultivated for 48 hours at the constant temperature of 30 ℃ in a sealing way, so as to obtain the composite microbial inoculum culture solution;
③ Waste concrete is taken as a raw material, wood dust, glass and metal impurities are removed, and crushed and sieved by a jaw crusher to obtain recycled aggregate with the grain size distribution of 17.5-26.5 mm;
④ And (3) putting the recycled aggregate prepared in the step ③ into the composite microbial inoculum culture solution prepared in the step ②, soaking for 24 hours, taking out, placing in a flowing carbonization chamber with the humidity of 75% and the temperature of 27 ℃, injecting CO 2 gas into the flowing carbonization chamber by using a flowing carbonization method, and obtaining the microbial carbonization recycled aggregate after the flow rate of 5L/min and the flow rate of 50% of CO 2.
The preparation method of the modified carbon fiber admixture specifically comprises the following steps:
a. Adding 6kg of carbon fiber into 200L of acetone, carrying out ultrasonic treatment for 30min, pouring into a flask, refluxing in a water bath at a constant temperature of 80 ℃ for 24h, filtering, taking out, washing for 6 times by oscillating with deionized water and absolute ethyl alcohol, and drying to obtain desized carbon fiber;
b. Adding 200L of the desized carbon fiber prepared in the step a into a mixed strong acid solution prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, carrying out water bath acidification reaction at the constant temperature of 80 ℃ for 4 hours, taking out, repeatedly oscillating and washing with deionized water and absolute ethyl alcohol until the washed solution is neutral, and drying to obtain the acid oxidized carbon fiber;
c. adding the acid oxidized carbon fiber prepared in the step b into a silane coupling agent solution, carrying out ultrasonic treatment for 80min, refluxing for 4 hours at the constant temperature of 80 ℃, filtering, taking out, oscillating and washing for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain silanized carbon fiber;
The silane coupling agent solution is prepared from 200L of absolute ethyl alcohol, 40L of silane coupling agent and 20L of deionized water;
d. Adding 5kg of graphene oxide into 500LN, N-dimethylformamide, magnetically stirring for 20min, adding the silanized carbon fiber prepared in the step c, carrying out ultrasonic treatment for 2h, refluxing at 105 ℃ for 8h, taking out, carrying out oscillation cleaning for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain the modified carbon fiber admixture.
In addition, the invention also provides a preparation method of the environment-friendly high-performance concrete, and the preparation method is implemented according to the embodiment 1.
Example 3
An environment-friendly high-performance concrete comprises the following components in parts by weight: 164 parts of water, 385 parts of cement, 600 parts of river sand, 1250 parts of microbial carbonized recycled aggregate, 50 parts of polycarboxylate superplasticizer and 95 parts of modified carbon fiber admixture.
The preparation method of the microbial carbonized regenerated aggregate specifically comprises the following steps:
① 550g of tryptone, 300mL of yeast extract powder solution, 525g of sodium chloride, 275g of calcium lactate, 125g of calcium nitrate and 75g of sodium lactate are added into 60L of ultrapure water, and uniformly stirred to prepare LB culture solution;
② Adding 12.5g of composite microbial inoculum into the LB culture solution prepared in the step ①, sufficiently oscillating, and culturing at the constant temperature of 30 ℃ for 48 hours in a sealing manner to obtain the composite microbial inoculum culture solution;
③ Waste concrete is taken as a raw material, wood dust, glass and metal impurities are removed, and crushed and sieved by a jaw crusher to obtain recycled aggregate with the grain size distribution of 10-17.5 mm;
④ And (3) putting the recycled aggregate prepared in the step ③ into the composite microbial inoculum culture solution prepared in the step ②, soaking for 24 hours, taking out, placing in a flowing carbonization chamber with the humidity of 70% and the temperature of 25 ℃, and injecting CO 2 gas into the flowing carbonization chamber by using a flowing carbonization method, wherein the concentration of CO 2 is 35%, the flow rate is 4.5L/min, and the microbial carbonization recycled aggregate is obtained after 5.5 hours.
The preparation method of the modified carbon fiber admixture specifically comprises the following steps:
a. adding 5kg of carbon fiber into 175L of acetone, carrying out ultrasonic treatment for 30min, pouring into a flask, refluxing in a water bath at a constant temperature of 60 ℃ for 20h, filtering, taking out, washing for 6 times by oscillating with deionized water and absolute ethyl alcohol, and drying to obtain desized carbon fiber;
b. Adding 175L of the desized carbon fiber prepared in the step a into a mixed strong acid solution prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 1:1, carrying out acidizing reaction for 4.5 hours in a water bath at the constant temperature of 75 ℃, taking out, repeatedly oscillating and washing with deionized water and absolute ethyl alcohol until the washed solution is neutral, and drying to obtain the acid oxidized carbon fiber;
c. Adding the acid oxidized carbon fiber prepared in the step b into a silane coupling agent solution, carrying out ultrasonic treatment for 70min, refluxing for 4 hours at the constant temperature of 80 ℃, filtering, taking out, oscillating and washing for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain silanized carbon fiber;
the silane coupling agent solution is prepared from 175L of absolute ethyl alcohol, 37.5L of silane coupling agent and 17.5L of deionized water;
d. adding 4kg of graphene oxide into 450LN, N-dimethylformamide, magnetically stirring for 15min, adding the silanized carbon fiber prepared in the step c, carrying out ultrasonic treatment for 1.5h, refluxing at 105 ℃ for 7h, taking out, carrying out oscillation cleaning for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain the modified carbon fiber admixture.
In addition, the invention also provides a preparation method of the environment-friendly high-performance concrete, and the preparation method is implemented according to the embodiment 1.
Comparative example 1
This comparative example provides an environment-friendly high-performance concrete and a preparation method thereof, which is different from example 1 only in that:
The method comprises the steps of replacing microorganism carbonized recycled aggregate with an equivalent recycled aggregate, replacing modified carbon fiber admixture with an equivalent mineral admixture, wherein the recycled aggregate is prepared by taking waste concrete as a raw material, crushing the waste concrete by a jaw crusher, and sieving; the particle diameter is 4.75-26.5mm; the mineral blend is composed of silica fume and fly ash; the remaining components and the content of the components were the same as in example 1.
Comparative example 2
This comparative example provides an environment-friendly high-performance concrete and a preparation method thereof, which is different from example 1 only in that:
The method comprises the steps of replacing microorganism carbonized recycled aggregate with the same amount of recycled aggregate, wherein the recycled aggregate is prepared by taking waste concrete as a raw material, crushing the waste concrete by a jaw crusher, and sieving the waste concrete; the particle diameter was 4.75-26.5mm, and the remaining components and the component contents were the same as in example 1.
Comparative example 3
This comparative example provides an environment-friendly high-performance concrete and a preparation method thereof, which is different from example 1 only in that:
adopting an equivalent amount of mineral admixture to replace a modified carbon fiber admixture, wherein the mineral admixture consists of silica fume and fly ash; the remaining components and the content of the components were the same as in example 1.
Comparative example 4
This comparative example provides an environment-friendly high-performance concrete and a preparation method thereof, which is different from example 1 only in that:
The method comprises the steps of adopting an equivalent amount of natural aggregate to replace microorganism carbonized recycled aggregate and an equivalent amount of mineral admixture to replace modified carbon fiber admixture, wherein the natural aggregate is limestone macadam with the maximum particle size of 15mm, and the mineral admixture consists of silica fume and fly ash; the remaining components and the content of the components were the same as in example 1.
Experimental example 1
Slump test:
Experimental samples: the concrete prepared in example 1 and comparative examples 1 to 4.
The experimental example refers to the procedure of the method standard for testing the performance of common concrete mixtures (GB/T50080-2016), and the test specifically comprises the following steps:
(1) Wetting the inner wall of the slump barrel and the bottom plate of the barrel by tap water, placing the barrel on the bottom plate, and putting the bottom plate on a solid horizontal plane to step on pedals on two sides of the barrel;
(2) Uniformly adding the recycled concrete sample into the cylinder for three times, and uniformly inserting and tamping a layer of recycled concrete from the edge to the center for 25 times each time;
(3) The concrete is inserted and rammed through, the second layer is inserted and rammed to the surface of the next layer, and the concrete is added at any time;
(4) And trowelling a cylinder opening after the compaction is finished, leveling a slump scale with the cylinder opening, then lifting the slump cylinder vertically and stably, and measuring the height difference between the scale and the highest point of the slump concrete sample by using a steel scale.
Analysis of results: FIG. 2 is a graph showing slump test results of the concrete prepared in example 1 and comparative examples 1 to 4; since the surface of the recycled aggregate is adhered with a large amount of old mortar, the water absorption of the recycled aggregate is improved, so that the working performance of the concrete of the comparative example 1 is far lower than that of the concrete of the comparative example 4, and the slump of the concrete of the example 1 is higher than that of the concrete of the comparative example 4 under the combined action of the microbial carbonized recycled aggregate and the modified carbon fiber admixture, which shows that the microbial action and the modified carbon fiber play a positive role in improving the performance of the concrete.
Experimental example 2
Concrete compressive strength test:
Experimental samples: the concrete prepared in example 1 and comparative examples 1 to 4.
The experimental example is tested according to the standard of the test method of physical and mechanical properties of concrete (GB/T50081-2019), and the test specifically comprises the following steps:
1. placing the stirred concrete into 100X 100mm cube molds, manufacturing 5 test pieces in each group, controlling the vibration time of a vibrating table to be three times for preventing the concrete from layering and segregation, taking down the templates after 8s each time of vibration for 24 hours, numbering, and placing the templates into a curing box for curing for 28d;
2. taking out the concrete test block after curing for 28d, putting the concrete test block in front of a press, wiping a supporting surface clean, then putting the concrete test block in the center of the press, controlling the loading speed of the press to be 0.3MPa/s-1.0MPa/s, uniformly and continuously loading, and recording the breaking load of the test sample; the compressive strength is as follows: f=f/a; wherein F is the breaking load (N) of the test piece, A is the bearing area (mm 2) of the test piece, and F is the compressive strength (MPa) of the concrete axis.
Analysis of results: FIG. 3 is a graph showing the results of compressive strength tests of the concrete prepared in example 1 and comparative examples 1 to 4; as can be seen from the graph, the compressive strength of the concrete of the comparative example 1 is obviously lower than that of the concrete of the comparative example 4 with the same water cement ratio, which shows that the performance of the recycled aggregate is far lower than that of the natural aggregate, the compressive strength of the concrete of the example 1 is higher than that of the concrete of the comparative example 4, and the compressive capacity of the concrete is also improved under the combined action of the microbial carbonized recycled aggregate and the modified carbon fiber admixture.
Experimental example 3
Capillary water absorption test of concrete:
Experimental samples: the concrete prepared in example 1 and comparative examples 1 to 4.
The experimental example specifically comprises the following steps:
A. Placing the stirred concrete into 100X 100mm cube molds, manufacturing 5 test pieces in each group, controlling the vibration time of a vibrating table to be three times for preventing the concrete from layering and segregation, taking down the templates after 8s each time of vibration for 24 hours, numbering, and placing the templates into a curing box for curing for 28d;
B. Immersing the test piece in a water container, keeping the water surface to be 5mm higher than the surface of the test piece for 24 hours, taking out and wiping off excessive water on the surface of the test piece, enabling the test piece to reach a saturated surface dry state, and weighing to obtain M 0;
C. The test piece is placed in an oven, dried to constant weight at the temperature of (105+/-5), and cooled to room temperature, and the mass M 1 is obtained.
The water absorption (W) is calculated according to the following formula: w (%) = (M 0-M1）/M1 ×100%;
Analysis of results: FIG. 4 is a graph showing the results of capillary water absorption tests of the concrete prepared in example 1 and comparative examples 1 to 4; concrete is essentially a porous material, and the water absorption performance of concrete is mainly related to the density, the size and the structure of internal pores of the concrete; the recycled aggregate is characterized by large pores, high water absorption and the like, and a large amount of old cement mortar is attached to the surface of the recycled aggregate, so that the water absorption performance of the recycled concrete is different from that of common concrete, therefore, the water absorption of comparative examples 1 and 2 is obviously higher than that of examples 1,3 and 4, the water absorption of the concrete of example 1 is lower than that of comparative example 4, and the cohesiveness between the recycled aggregate and a concrete matrix is improved under the combined action of the microbial carbonized recycled aggregate and the modified carbon fiber admixture, the porosity is reduced, and the water absorption is reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made hereto without departing from the spirit and principles of the present invention.
The invention and its embodiments have been described above with no limitation, and the invention is illustrated in the figures of the accompanying drawings as one of its embodiments, without limitation in practice. In summary, those skilled in the art, having benefit of this disclosure, will appreciate that the invention can be practiced without the specific details disclosed herein.
Claims (9)
1. An environment-friendly high-performance concrete is characterized in that: the concrete comprises the following components in parts by weight: 154-174 parts of water, 365-400 parts of cement, 550-650 parts of river sand, 1050-1450 parts of microorganism carbonized regenerated aggregate, 40-60 parts of polycarboxylate superplasticizer and 80-110 parts of modified carbon fiber admixture;
The preparation method of the microbial carbonized recycled aggregate specifically comprises the following steps:
① Adding tryptone, yeast extract powder solution, sodium chloride, calcium lactate, calcium nitrate and sodium lactate into ultrapure water, and uniformly stirring to prepare LB culture solution;
② Adding a composite microbial inoculum into the LB culture solution prepared in the step ①, sufficiently shaking, and culturing at a constant temperature of 30 ℃ for 48 hours in a sealing manner to obtain a composite microbial inoculum culture solution;
③ Waste concrete is taken as a raw material, wood dust, glass and metal impurities are removed, and crushed and sieved by a jaw crusher to obtain recycled aggregate with the grain size distribution of 4.75-26.5 mm;
④ And (3) putting the recycled aggregate prepared in the step ③ into the composite microbial inoculum culture solution prepared in the step ②, soaking for 24 hours, taking out, placing in a flowing carbonization chamber with the humidity of 60-75% and the temperature of 23-27 ℃, injecting CO 2 gas into the flowing carbonization chamber by utilizing a flowing carbonization method, and obtaining the microbial carbonization recycled aggregate after the CO 2 concentration is 20-50% and the flow rate is 4-5L/min and 5-6 hours.
2. An environmentally friendly high performance concrete according to claim 1, wherein: in step ①, the LB culture solution comprises the following components in parts by weight: 1000-1200 parts of ultrapure water, 10-12 parts of tryptone, 5-7 parts of yeast extract powder solution, 10-11 parts of sodium chloride, 5-6 parts of calcium lactate, 2-3 parts of calcium nitrate and 1-2 parts of sodium lactate.
3. An environmentally friendly high performance concrete according to claim 2, wherein: in step ②, the composite microbial inoculum culture solution consists of a composite microbial inoculum and an LB culture solution, wherein the composite microbial inoculum consists of bacillus, sarcina bardana and bacillus alcaligenes, and the concentration ratio of bacillus, sarcina bardana and bacillus alcaligenes in the composite microbial inoculum is 2-2.5:1-2:2-2.5; the concentration of the bacillus cereus in the composite microbial inoculant solution is 1 multiplied by 10 8-2×108 cells/mL.
4. An environmentally friendly high performance concrete according to claim 3, wherein: the preparation method of the modified carbon fiber admixture specifically comprises the following steps:
a. adding carbon fiber into acetone, performing ultrasonic treatment for 30-40min, pouring into a flask, refluxing in a water bath at a constant temperature of 60-80 ℃ for 20-24h, filtering, taking out, washing with deionized water and absolute ethyl alcohol for 6 times by oscillation, and drying to obtain desized carbon fiber;
b. Adding the desized carbon fiber prepared in the step a into a mixed strong acid solution, carrying out water bath acidification reaction at the constant temperature of 70-80 ℃ for 4-5 hours, taking out, repeatedly oscillating and washing with deionized water and absolute ethyl alcohol until the washed solution is neutral, and drying to obtain the acid oxidized carbon fiber;
c. Adding the acid oxidized carbon fiber prepared in the step b into a silane coupling agent solution, carrying out ultrasonic treatment for 60-80min, refluxing for 4 hours at the constant temperature of 80 ℃, filtering, taking out, oscillating and washing for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain silanized carbon fiber;
d. Adding graphene oxide into N, N-dimethylformamide, magnetically stirring for 10-20min, adding the silanized carbon fiber prepared in the step c, carrying out ultrasonic treatment for 1-2h, refluxing at 105 ℃ for 6-8h, taking out, carrying out oscillation cleaning for 6 times by using deionized water and absolute ethyl alcohol, and drying to obtain the modified carbon fiber admixture.
5. An environmentally friendly high performance concrete according to claim 4, wherein: in the step a, the mass concentration of the carbon fiber in the acetone is 0.0267-0.03kg/L.
6. An environmentally friendly high performance concrete according to claim 5, wherein: in the step b, the mixed strong acid solution is prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to a volume ratio of 1:1, and the mass concentration of the desized carbon fiber in the mixed strong acid solution is 0.0253-0.028kg/L.
7. The environment-friendly high-performance concrete according to claim 6, wherein: in the step c, the silane coupling agent solution is prepared from 150-200L of absolute ethyl alcohol, 35-40L of silane coupling agent and 15-20L of deionized water, and the mass concentration of the acid oxidized carbon fiber in the silane coupling agent solution is 0.0175-0.02kg/L.
8. The environment-friendly high-performance concrete according to claim 7, wherein: in the step d, the mass concentration of the graphene oxide in the N, N-dimethylformamide is 0.0075-0.01kg/L.
9. A method for preparing the environment-friendly high-performance concrete according to any one of claims 1 to 8, which is characterized in that: the method specifically comprises the following steps:
S1, adding a polycarboxylate water reducer and a modified carbon fiber admixture into water, uniformly stirring, and performing ultrasonic treatment for 60-70min to obtain a modified carbon fiber admixture dispersion;
and S2, uniformly stirring the microbial carbonized regenerated aggregate and the river sand, adding the modified carbon fiber admixture dispersion prepared in the step S1, fully stirring, adding cement, the modified carbon fiber admixture dispersion and water, and continuously stirring to obtain the environment-friendly high-performance concrete.
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