AU2020260393B2 - Method for preparing garden rockery or terrain by recycling building solid waste on demolished site - Google Patents

Method for preparing garden rockery or terrain by recycling building solid waste on demolished site Download PDF

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AU2020260393B2
AU2020260393B2 AU2020260393A AU2020260393A AU2020260393B2 AU 2020260393 B2 AU2020260393 B2 AU 2020260393B2 AU 2020260393 A AU2020260393 A AU 2020260393A AU 2020260393 A AU2020260393 A AU 2020260393A AU 2020260393 B2 AU2020260393 B2 AU 2020260393B2
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rockery
terrain
mold
solid waste
building
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AU2020260393A1 (en
Inventor
Xin Chen
Mingjing DING
Mingliang Ding
Yiwen JI
Yangyang LIU
Jican MO
Penghao SONG
Jiyan TENG
Wenting WANG
Zhe Wang
Lang Zhang
Qingping ZHANG
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Nanjing Forestry University
Shanghai Academy of Landscape Architecture Science and Planning
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Nanjing Forestry University
Shanghai Academy of Landscape Architecture Science and Planning
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Priority to CN201910440509.0A priority patent/CN110183174A/en
Priority to CN202010305896.X priority
Priority to CN202010305896.XA priority patent/CN111423182B/en
Application filed by Nanjing Forestry University, Shanghai Academy of Landscape Architecture Science and Planning filed Critical Nanjing Forestry University
Priority to PCT/CN2020/091201 priority patent/WO2020238716A1/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/08Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • B28B1/0935Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material using only elements wholly or partly immersed in the material, e.g. cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245Curing concrete articles
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use 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
    • C04B18/04Waste materials; Refuse
    • C04B18/16Waste materials; Refuse from building or ceramic industry
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10Coating or impregnating
    • C04B20/1018Coating or impregnating with organic materials
    • C04B20/1029Macromolecular compounds
    • C04B20/1037Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/28Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/283Polyesters
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00008Obtaining or using nanotechnology related materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/58Construction or demolition [C&D] waste
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a method for preparing a rockery or terrain by recycling building solid waste on a demolished site, and relates to the technical field of rockery or terrain processing. The method includes the following steps of (1) mold making, (2) building solid waste crushing, (3) material mixing, (4) pouring, (5) structural densification treatment, (6) demolding, and (7) modification. The invention uses the building solid waste as a main material, and uses auxiliary materials such as polycaprolactone to prepare the rockery or terrain through processing, thereby realizing reasonable recycling of the building solid waste; and a made rockery or terrain is good in appearance quality, strong in environmental protection property, good in compressive property and strong in water retaining property at the same time, cultivation of green plants on the rockery or terrain is facilitated, thereby beautifying and purifying the environment.

Description

DESCRIPTION METHOD FOR PREPARING GARDEN ROCKERY OR TERRAIN BY RECYCLING BUILDING SOLID WASTE ON DEMOLISHED SITE FIELD OF THE INVENTION
[0001] The invention relates to the technical field of rockery or terrain processing, in particular to a method for preparing a garden rockery or terrain by recycling building solid waste on a demolished site.
DESCRIPTION OF RELATED ART
[0002] A rockery is a mountain built with soil, stone and other materials in a garden for the purpose of landscaping. The rockery has many landscaping functions, such as constituting a main landscape or a terrain sketch of the garden, dividing and organizing the garden space, arranging a courtyard, an embankment, a revetment, and soil retaining, and setting up a natural flower stand. It can also be combined with a garden building, a garden road, a site, and garden plants to form varied landscapes, thereby reducing artificial atmosphere, adding natural interest, and harmonizing the garden building with a landscape environment. Therefore, the rockery has become one of the characteristics of natural landscape gardens in China.
[0003] The development of a modem garden rockery is different from that of a classical garden rockery, and shows tendencies of diversification and integration. The classical rockery is limited to stone, construction technical and other conditions, and therefore has certain limitations in landscape creation. However, as the development of modem construction technologies and artificial stone materials, it is possible to create varied and abundant stone landscapes. Especially for large-scale, large-mass stony hill creation, the creative inspiration can be obtained from natural geomorphological form characteristics and combination features. The use of cement, plaster, concrete, glass fiber reinforced plastic, organic resin, and low alkalinity glass-fiber reinforced cement (GRC) as materials to "shape stone" is emerging in the modem gardens. The stone shaping has the advantages that the shape is free and varied, the mass can be large or small, the color is changeable, the weight is light, the stone is saved, the cost is saved,
DESCRIPTION and a stone shaped work is of a modem style, and is especially suitable for places with restricted construction conditions or restricted load-bearing conditions.
[0004] In terms of the scope of the garden, the terrain includes a mound, a terrace, a slope, flat ground, or an artificial terrain with level changes formed by steps and ramps. During the construction of garden projects, terrain undulating of different elevations and levels can create a rich garden landscape effect. The use of solid waste as a terrain filling material in combination with greening has certain ecological benefits. The solid waste is effectively used to build the terrain, such that transportation and solid waste treatment costs can be transformed into effective economic benefits.
[0005] Building solid waste (waste concrete building waste and brick-concrete building waste) accounts for the largest proportion of all types of building waste in a demolished site, and is currently the main target for the recycling and utilization of building solid waste. At present, the waste concrete building waste and brick-concrete building waste are mainly processed into recycled coarse aggregates and recycled fine aggregates for the production of concrete, mortar, concrete blocks, concrete bricks and inorganic mixtures in a road project. At present, the yield of the building solid waste is very large, and if unreasonably used, it will seriously affect the environment. The processing of the rockery or the terrain requires a variety of inorganic materials. In order to realize the application of the building solid waste in rockery processing and terrain creation, the invention provides a rockery or terrain processing method by using building solid waste as a main material.
SUMMARY OF THE INVENTION
Technical Problem
[0006] The invention provides a method for preparing a garden rockery or terrain by recycling building solid waste on a demolished site, through which, recycling of building solid waste is realized, and a made rockery or terrain is strong in environmental protection property, and has both good appearance quality and use quality at the same time.
Technical Solution
[0007] A method for preparing a garden rockery or terrain by recycling building solid
DESCRIPTION waste on a demolished site includes the following steps:
[0008] (1) mold making: making a mold according to an established structure of the rockery or terrain, where the mold includes an outer mold and an inner mold;
[0009] (2) building solid waste crushing: roughly and finely crushing the building solid waste into powder with a particle size less than 2 mm;
[0010] (3) material mixing: adding the above building solid waste powder, polycaprolactone, Portland cement, a nano-absorbent filler, a naphthalene-based water reducer, and an aluminate coupling agent into a mixer according to a proportion, and adding water to adjust a solid content of an obtained mixture to 60% to 70%, and mixing the mixture uniformly to obtain a rockery or terrain processing material;
[0011] (4) pouring: leading the above material into the mold, inserting a vibrating rod into the mold to compact the material through vibration, and supplementing the material until the material is flush with a mold opening after compacted;
[0012] (5) structural densification treatment: placing the poured mold in a heat treatment chamber, first heating to 130°C to 140°C at a heating rate of 5 to 10°C/min and performing heat preservation until moisture in the material evaporates, then transferring the mold into a cold treatment chamber, cooling to -5°C to 5°C at a cooling rate of 5 to 10°C/min, performing heat preservation and standing for 0.5-2 h, and then naturally returning to a room temperature;
[0013] (6) demolding: separating the outer mold and the inner mold to obtain a crude rockery or terrain; and
[0014] (7) modification: performing surface finishing on the made crude rockery or terrain to obtain a finished rockery or terrain.
[0015] The invention utilizes a principle of thermal expansion and contraction, through operation of programmed temperature increase and programmed temperature decrease, densifies an internal structure of the made rockery or terrain, and avoids occurrence of an internal void structure, thereby enhancing the mechanical properties of the made rockery, especially a compressive strength.
[0016] The building solid waste is selected from one of waste concrete building waste and waste brick-concrete building waste.
DESCRIPTION
[0017] The nano-absorbent filler is selected from one of nano calcium carbonate and nano talcum powder.
[0018] A mass ratio of the building solid waste powder to the polycaprolactone to the Portland cement to the nano-absorbent filler to the naphthalene-based water reducer to the aluminate coupling agent is 100-150: 10-30: 25-50: 10-20: 1-10: 1-10.
[0019] The polycaprolactone is formed through ring-opening polymerization of c caprolactone under the conditions that a metallo-organic compound serves as a catalyst and dihydroxy or trihydroxy serves as an initiator, and belongs to polymeric polyester. The invention improves the mechanical properties of the made rockery or terrain by adding the polycaprolactone, so that new application of the polycaprolactone in processing of the rockery or terrain is realized, and the polycaprolactone has biodegradability, so it has no pollution to the environment.
[0020] In order to further improve water absorption performance of the nano calcium carbonate as the nano-absorbent filler and further facilitates green plant cultivation of the made rockery or terrain, the invention further performs surface modification on the nano calcium carbonate through a specific technical solution as follows.
[0021] The surface modification is performed on the nano calcium carbonate through a modification method as follows: first adding water to polyglutamic acid to prepare a solution, then heating to 60°C to 70°C, performing heat preservation and stirring, slowly adding the nano calcium carbonate under stirring, continuing to perform heat preservation and stirring for 15 to 30 min at 60°C to 70°C after the nano calcium carbonate is completely added, stopping heating, feeding the obtained solution to a freezing dryer after naturally cooled to a room temperature, and crushing and grinding a solid obtained after drying into nano powder.
[0022] A mass ratio of the nano calcium carbonate to the polyglutamic acid is 10: 0.5 2.
[0023] According to the invention, the polyglutamic acid is used as a surface modification treatment agent of the nano calcium carbonate, and a novel substance, namely the nano calcium carbonate with the surface coated with the polyglutamic acid, is prepared through the above modification treatment. When meeting water, the substance first utilizes the polyglutamic acid coating the surface to absorb the water,
DESCRIPTION and when a water absorption capacity of the polyglutamic acid on the surface reaches the maximum, the water will penetrate into internal calcium carbonate, thereby greatly increasing a water absorption rate of the calcium carbonate. At the same time, the polyglutamic acid coating the surface imparts a water retention capacity, rapid loss of water absorbed in the calcium carbonate due to evaporation in a high-temperature natural environment is avoided, thereby facilitating plant cultivation on the rockery or terrain.
Advantageous Effect
[0024] The invention uses the building solid waste as a main material in combination with auxiliary materials such as the polycaprolactone to prepare the rockery through processing, so that reasonable recycling of the building solid waste is realized, and the adverse effect of the discarded building solid waste on the environment is avoided. The made rockery is good in appearance quality and strong in environmental protection property, does not produce a hazardous substance into the environment during use, is good in compressive property and strong in water retaining property at the same time, and facilitates the cultivation of green plants on the rockery or terrain, thereby beautifying and purifying the environment.
DETAILED DESCRIPTION OF THE INVENTION
[0025] In order to make technical means, creative features, objectives and effects implemented by the invention readily understood, the invention will be further described with reference to specific examples below.
[0026] Building solid waste in the following examples and comparative examples comes from waste concrete building solid waste from a same demolished residential building in a certain community in this city. Polycaprolactone is available from Hunan Juren Chemical Hitechnology Co., Ltd., Portland cement is 325 Portland cement available from Foshan Runhe Building Material Co., Ltd., a naphthalene-based water reducer is an FDN naphthalene-based water reducer available from Zhengzhou Hongboli Chemical Products Co., Ltd., an aluminate coupling agent is available from Zibo Panguang Plastic Co., Ltd., nano calcium carbonate is available from Qingzhou Yuxin Calcium Industrial Co., Ltd., with an average particle size of 100 nm, nano talcum powder is available from Shanghai Juqian Chemical Industry Limited Co., Ltd.,
DESCRIPTION with an average particle size of 100 nm, and polyglutamic acid is available from Xi'an Bai Chuan Biotech Co., Ltd., with a molecular weight of 2 million.
Example 1
[0027] Rockery processing:
[0028] (1) mold making: a mold is made according to an established structure of a rockery, where a mold includes an outer mold and an inner mold;
[0029] (2) building solid waste crushing: building solid waste is roughly and finely crushed into powder with a particle size less than 2 mm;
[0030] (3) material mixing: 137 kg of the above waste concrete building solid waste, 24 kg of polycaprolactone, 38 kg of Portland cement, 12 kg of nano calcium carbonate, 2 kg of naphthalene-based water reducers, and 3 kg of aluminate coupling agents are added into a mixer according to a proportion, and water is added to adjust a solid content of an obtained mixture to 70%, and the mixture is mixed uniformly to obtain a rockery processing material;
[0031] (4) pouring: the above material is led into the mold, a vibrating rod is inserted into the mold to compact the material through vibration, and the material is supplemented until the material is flush with a mold opening after compacted;
[0032] (5) structural densification treatment: the poured mold is placed in a heat treatment chamber, first the mold is heated to 140°C at a heating rate of 5°C/min and heat preservation is performed until moisture in the material evaporates, then the mold is transferred into a cold treatment chamber, and is cooled to -5°C at a cooling rate of °C/min, heat preservation and standing are performed for 1 h, and then the mold naturally returns to a room temperature;
[0033] (6) demolding: the outer mold and the inner mold are separated to obtain a crude rockery; and
[0034] (7) modification: surface finishing is performed on the made crude rockery to obtain a finished rockery.
Example 2
[0035] Terrain processing:
DESCRIPTION
[0036] (1) mold making: a mold is made according to an established structure of a terrain, where the mold includes an outer mold and an inner mold;
[0037] (2) building solid waste crushing: building solid waste is roughly crushed and finely crushed into powder with a particle size less than 2 mm;
[0038] (3) material mixing: 132 kg of the above waste concrete building solid waste, 22 kg of polycaprolactone, 35 kg of Portland cement, 10 kg of nano calcium carbonate, 2 kg of naphthalene-based water reducers, and 2 kg of aluminate coupling agents are added into a mixer according to a proportion, and water is added to adjust a solid content of an obtained mixture to 70%, and the mixture is mixed uniformly to obtain a terrain processing material;
[0039] (4) pouring: the above material is led into the mold, a vibrating rod is inserted into the mold to compact the material through vibration, and the material is supplemented until the material is flush with a mold opening after compacted;
[0040] (5) structural densification treatment: the poured mold is placed in a heat treatment chamber, first the mold is heated to 140°C at a heating rate of 5°C/min and heat preservation is performed until moisture in the material evaporates, then the mold is transferred into a cold treatment chamber, and is cooled to -5°C at a cooling rate of °C/min, heat preservation and standing are performed for 1 h, and then the mold naturally returns to a room temperature;
[0041] (6) demolding: the outer mold and the inner mold are separated to obtain a crude terrain; and
[0042] (7) modification: surface finishing is performed on the made crude terrain to obtain a finished terrain.
Example 3
[0043] Example 1or 2 is taken as reference, a rockery or terrain which is made by replacing nano calcium carbonate with an equivalent amount of nano talcum powder is set. The remaining of processing operation is basically the same as that of Example 1 or 2.
Example 4
[0044] Example 1or 2 is taken as reference, a rockery or terrain which is made by
DESCRIPTION performing surface modification on nano calcium carbonate is set. The remaining of processing operation is basically the same as that of Example 1 or 2.
[0045] For the surface modification on the nano calcium carbonate of the rockery: first kg of water is added to 1.5 kg of polyglutamic acid to prepare a solution, then the solution is heated to 70°C, heat preservation and stirring are performed, 10 kg of nano calcium carbonate is slowly added under stirring, heat preservation and stirring are further performed for 30 min at 70°C after the nano calcium carbonate is completely added, heating is stopped, the obtained solution is fed to a freezing dryer after naturally cooled to a room temperature, and a solid obtained after drying is crushed and ground into nano powder with an average particle size of 100 nm.
[0046] For the surface modification on the nano calcium carbonate of the terrain: first kg water is added to 1.5 kg of polyglutamic acid to prepare a solution, then the solution is heated to 70°C, heat preservation and stirring are performed, 8 kg of nano calcium carbonate is slowly added under stirring, heat preservation and stirring are further performed for 30 min at 70°C after the nano calcium carbonate is completely added, heating is stopped, the obtained solution is fed to a freezing dryer after naturally cooled to a room temperature, and a solid obtained after drying is crushed and ground into nano powder with an average particle size of 100 nm.
Comparative example 1
[0047] Example 1 is taken as reference, and Comparative example 1 without structural densification treatment is set. A poured material is naturally solidified and molded at a normal temperature of 25°C, and the remaining of processing operation is basically the same as that of Example 1.
Comparative example 2
[0048] Example 1 is taken as reference, Comparative example 2 without adding polycaprolactone is set, and the remaining of processing operation is basically the same as that of Example 1.
[0049] Examples 1to 4 and Comparative examples 1 to 2 are used to process rockeries, and a water absorption rate, a water retention rate, and a compressive strength of the made rockeries are measured. Test results are shown in Table 1.
[0050] 1. A water absorption rate testing method: the rockeries made in Example 1,
DESCRIPTION Examples 3 to 4, and the comparative example are separately selected as test pieces, a weight Wo of the test pieces is weighed, then the test pieces are immersed in clean water, and are taken out after 1 h, a weight W1 of the test pieces absorbing water is weighed, and the water absorption rate is calculated, where the water absorption rate Qi=(Wi Wo)/Wox100%.
[0051] 2. A water retention rate testing method: the rockeries made in Example 1, Examples 3 to 4, and the comparative example are separately selected as test pieces, a weight Wo of the test pieces is weighed, then the test pieces are immersed in clean water, and are taken out after 12 h, a weight W 2 of the test pieces absorbing water is weighed, centrifugation is performed at a speed of 1200 r/min for 5 min, a weight W3 of the centrifuged test pieces is weighed, a water absorption rate Q2 before centrifugation and a water absorption rate Q3 after centrifugation are calculated, and then a water retention rate is calculated, where the water retention rate=(Q3/Q2)x100%.
[0052] Q2=(W2-Wo)/Wox100O%; Q3=(W3-W)/Wox100O%.
[0053] 3. A compressive strength testing method: the rockeries made in Example 1, Examples 3 to 4, and the comparative example are separately selected as test pieces which are 30 cm in length, 25 cm in width and 20 cm in height. Then the test pieces are immersed in clean water, and taken out after 48 h. Surfaces of the test pieces are wiped dry, the test pieces are placed on an HCT series type-A press for strength testing, and a rate at which a load is applied is kept at 0.25 MPa/s. Table 1
Test item Example 1 Example 3 Example 4 Comparative Comparative example1I example 2 Water absorption 147 162 183 135 142 rate/% Water retention 36.5 38.0 45.6 24.3 35.8 rate/% Compressive 3.50 3.75 3.75 2.75 3.00 strength/MPa 3
[0054] It can be seen from Table 1 that in Example 4, compared with Example 1, the water absorption rate of the made rockery is increased from 147% to 183%, and the water retention rate is increased from 36.5% to 45.6% through the surface modification treatment on the nano calcium carbonate. In Example 1, compared with Comparative
DESCRIPTION example 1, the compressive strength of the made rockery is increased from 2.75 MPa to 3.50 MPa through structural densification treatment. In Example 1, compared with Comparative example 2, the compressive strength of the made rockery is increased from 3.00 MPa to 3.50 MPa through addition of the polycaprolactone. As shown in Table 1, in Comparative example 1 without structural densification treatment and Comparative example 2 without adding the polycaprolactone, the water absorption rate, the water retention rate and the compressive strength of the made rockeries are not as high as those of the rockeries made in Example 1 and Examples 3 to 4.
Comparative example 3
[0055] Example 2 is taken as reference, and Comparative example 3 without structural densification treatment is set. A poured material is naturally solidified and molded at a normal temperature of 25°C, and the remaining of processing operation is basically the same as that of Example 2.
Comparative example 4
[0056] Example 2 is taken as reference, Comparative example 4 without adding polycaprolactone is set, and the remaining of processing operation is basically the same as that of Example 2.
[0057] Examples 2 to 4 and Comparative examples 3 to 4 are separately utilized to process terrains, and a water absorption, a water retention rate, and a compressive strength of the made terrains are measured. Test results are shown in Table 2.
[0058] 1. A water absorption rate testing method: the terrains made in Examples 2 to 4, and Comparative examples 3 to 4 are separately selected as test pieces, a weight Wo of the test pieces is weighed, then the test pieces are immersed in clean water, and are taken out after 1 h, a weight W of the test pieces absorbing water is weighed, and the water absorption rate is calculated, where the water absorption rate Qi=(Wi Wo)/Wox100%.
[0059] 2. A water retention rate testing method: the terrains made in Examples 2 to 4, and Comparative examples 3 to 4 are separately selected as test pieces, a weight Wo of the test pieces is weighed, then the test pieces are immersed in clean water, and are taken out after 12 h, a weight W2 of the test pieces absorbing water is weighed, centrifugation is performed at a speed of 1200 r/min for 5 min, a weight W3 of the
DESCRIPTION centrifuged test pieces is weighed, a water absorption rate Q2 before centrifugation and a water absorption rate Q3 after centrifugation are calculated, and then the water retention rate is calculated, where the water retention rate=(Q3/Q2)x100%.
[0060] Q2=(W2-Wo)/Wox100O%; Q3=(W3-W)/Wox100%.
[0061] 3. A compressive strength testing method: the terrains made in Examples 2 to 4, and Comparative examples 3 to 4 are separately selected as test pieces which are 30 cm in length, 25 cm in width and 20 cm in height. Then the test pieces are immersed in clean water, and taken out after 48 h. Surfaces of the test pieces are wiped dry, the test pieces are placed on an HCT series type-A press for strength testing, and a rate at which a load is applied is kept at 0.25 MPa/s.
Table 2
Test item Example 2 Example 3 Example 4 Comparative Comparative example 3 example 4 Water absorption 138 158 173 125 132 rate/% Water retention 35.7 37.2 42.6 23.3 32.8 rate/% Compressive 3.25 3.65 3.65 2.65 2.85 strength/MPa
[0062] It can be seen from Table 2 that in Example 4, compared with Example 2, the water absorption rate of the made rockery is increased from 138% to 173%, and the water retention rate is increased from 35.7% to 42.6% through the surface modification treatment on the nano calcium carbonate. In Example 2, compared with Comparative example 3, the compressive strength of the made rockery is increased from 2.65 MPa to 3.25 MPa through structural densification treatment. In Example 2, compared with Comparative example 4, the compressive strength of the made rockery is increased from 2.85 MPa to 3.25 MPa through addition of the polycaprolactone. As shown in Table 2, in Comparative example 3 without structural densification treatment and Comparative example 4 without adding the polycaprolactone, the water absorption rate, the water retention rate and the compressive strength of the made terrain are not as high as those of the terrains made in Examples 2 to 4.
[0063] It should be noted that the method for preparing the garden rockery or terrain by recycling the building solid waste on the demolished site provided by the examples of
DESCRIPTION the invention has certain use advantages in places with relatively low rainfall, and facilitates the cultivation of green plants on the rockery or terrain due to the performance characteristics of strong water retention and strong compression resistance. In places with relatively high rainfall, the method can also retain water more effectively due to the performance characteristics of strong water retention and strong compression resistance, and has a relatively high compressive strength.
[0064] The foregoing shows and describes the basic principles and main features of the present invention and the advantages of the present invention. A person skilled in the art should understand that the present invention is not limited by the foregoing embodiments. The foregoing embodiments and the descriptions of the specification merely explain principles of the present invention. Various variations and improvements of the present invention can be made without departing from the spirit and scope of the present invention, and the variations and improvements fall within the protection scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and equivalents thereof.

Claims (5)

CLAIMS What is claimed is:
1. A method for preparing a rockery or terrain by recycling building solid waste on a demolished site, comprising the following steps:
(1) mold making: making a mold according to an established structure of the rockery or terrain, wherein the mold comprises an outer mold and an inner mold;
(2) building solid waste crushing: roughly and finely crushing the building solid waste into powder with a particle size less than 2 mm;
(3) material mixing: adding the above building solid waste powder, polycaprolactone, Portland cement, a nano-absorbent filler, a naphthalene-based water reducer, and an aluminate coupling agent into a mixer according to a proportion, and adding water to adjust a solid content of an obtained mixture to 60% to 70%, and mixing the mixture uniformly to obtain a rockery processing material;
(4) pouring: leading the above material into the mold, inserting a vibrating rod into the mold to compact the material through vibration, and supplementing the material until the material is flush with a mold opening after compacted;
(5) structural densification treatment: placing the poured mold in a heat treatment chamber, first heating to 130°C to 140°C at a heating rate of 5 to 10°C/min and performing heat preservation until moisture in the material evaporates, then transferring the mold into a cold treatment chamber, cooling to -5°C to 5°C at a cooling rate of 5 to °C/min, performing heat preservation and standing for 0.5-2 h, and then naturally returning to a room temperature;
(6) demolding: separating the outer mold and the inner mold to obtain a crude rockery or terrain; and
(7) modification: performing surface finishing on the made crude rockery or terrain to obtain a finished rockery or terrain.
2. The method for preparing the garden rockery or terrain by recycling the building solid waste on the demolished site according to claim 1, wherein the building solid waste is selected from one of waste concrete building waste and waste brick-concrete building waste on the demolished site.
CLAIMS 3. The method for preparing the garden rockery or terrain by recycling the building solid waste on the demolished site according to claim 1, wherein the nano-absorbent filler is selected from one of nano calcium carbonate and nano talcum powder.
4. The method for preparing the garden rockery or terrain by recycling the building solid waste on the demolished site according to claim 3, wherein surface modification is performed on the nano calcium carbonate through a modification method as follows: first adding water to polyglutamic acid to prepare a solution, then heating to 60°C to °C, performing heat preservation and stirring, slowly adding the nano calcium carbonate under stirring, continuing to perform heat preservation and stirring for 15 to min at 60°C to 70°C after the nano calcium carbonate is completely added, stopping heating, feeding the obtained solution to a freezing dryer after naturally cooled to a room temperature, and crushing and grinding a solid obtained after drying into nano powder.
5. The method for preparing the garden rockery or terrain by recycling the building solid waste on the demolished site according to claim 1, wherein a mass ratio of the building solid waste powder to the polycaprolactone to the Portland cement to the nano absorbent filler to the naphthalene-based water reducer to the aluminate coupling agent is 100-150:10-30:25-50:10-20:1-10:1-10.
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CN201910440509.0A CN110183174A (en) 2019-05-24 2019-05-24 A method of historic gardens artificial hillock is prepared using construction refuse regenerated
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CN202010305896.XA CN111423182B (en) 2019-05-24 2020-04-17 Method for preparing garden rockery by utilizing construction waste regeneration
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