CN108298849A - A kind of method of recycled aggregate intensive treatment - Google Patents
A kind of method of recycled aggregate intensive treatment Download PDFInfo
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- CN108298849A CN108298849A CN201810062501.0A CN201810062501A CN108298849A CN 108298849 A CN108298849 A CN 108298849A CN 201810062501 A CN201810062501 A CN 201810062501A CN 108298849 A CN108298849 A CN 108298849A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use 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
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
- C04B22/002—Water
- C04B22/0046—Waste slurries or solutions used as gauging water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
本发明涉及一种再生骨料强化处理的方法。该方法包括以下步骤：(1)将再生骨料置于稀醋酸溶液中浸泡，浸泡时长为12～36h。(2)浸泡结束后，将浸泡后的再生骨料捞出自然晾干，堆放备用。(3)对浸泡后的浑浊废液进行沉淀处理，得到澄清液和再生渣，将再生渣自然晾干后研磨备用。(4)将澄清液用作混凝土拌和水、再生渣用作填料拌和混凝土。本发明先利用稀醋酸对再生骨料表面进行处理，有效提高了再生骨料的性能，并将酸处理产生的渣液合理利用到混凝土的拌和生产中，不产生多余的废弃物，有效地解决再生骨料品质差、利用率低的问题，同时渣液用于混凝土中，对混凝土的性能影响很小，甚至能够在一定程度上改善混凝土的工作性，并提高强度。与现有的再生骨料强度方法相比，该方法安全、能耗低，全利用。The invention relates to a method for strengthening treatment of recycled aggregate. The method comprises the following steps: (1) soaking the regenerated aggregate in dilute acetic acid solution for 12-36 hours. (2) After soaking, take out the soaked recycled aggregates to dry naturally, and pile them up for later use. (3) Precipitate the turbid waste liquid after soaking to obtain clarified liquid and regenerated slag, dry the regenerated slag naturally and grind it for later use. (4) The clarified liquid is used as concrete mixing water, and the recycled slag is used as filler to mix concrete. The present invention first uses dilute acetic acid to treat the surface of the recycled aggregate, which effectively improves the performance of the recycled aggregate, and rationally uses the slag liquid produced by the acid treatment in the mixing production of concrete, without generating redundant waste, and effectively solves the problem of The quality of recycled aggregate is poor and the utilization rate is low. At the same time, the use of slag liquid in concrete has little effect on the performance of concrete, and can even improve the workability and strength of concrete to a certain extent. Compared with the existing recycled aggregate strength method, the method is safe, low in energy consumption and fully utilized.
Description
技术领域technical field
本发明涉及建筑材料的技术领域，具体涉及一种再生骨料强化处理的方法。The invention relates to the technical field of building materials, in particular to a method for reinforcing recycled aggregates.
背景技术Background technique
随着现代新科技的广泛普及和应用，世界范围内的工业化进程不断加速，资源化消耗和环境破坏也日益严重。作为使用最广泛的建筑材料，混凝土对环境造成了两大负面影响。一方面，混凝土的制造消耗了大量的自然资源。例如，目前的混凝土工业每年需要200多亿吨粗料(粗糙的)，这种需求在未来的20到30年间会翻倍。另一方面，所有制造的混凝土早晚都会被拆除，造成大量拆建(C&D)废物，尤其是混凝土废物。废混凝土在建筑废弃物组成中所占的比例最大，达到41％。全世界每年的混凝土使用量不断增长，由此导致的资源、能源、环境以及相关的社会问题十分突出。With the widespread popularization and application of modern new technologies, the process of industrialization worldwide is accelerating, and resource consumption and environmental damage are becoming increasingly serious. As the most widely used construction material, concrete has two major negative impacts on the environment. On the one hand, the manufacture of concrete consumes a lot of natural resources. For example, the current concrete industry requires more than 20 billion tons of coarse material (coarse) per year, and this demand will double in the next 20 to 30 years. On the other hand, all the concrete produced is demolished sooner or later, resulting in a lot of construction and demolition (C&D) waste, especially concrete waste. Waste concrete accounts for the largest proportion in the composition of construction waste, reaching 41%. The annual consumption of concrete in the world continues to increase, and the resulting resources, energy, environment and related social issues are very prominent.
对大量废混凝土进行循环再生利用即再生混凝土技术通常被认为是解决废混凝土问题最有效的措施。再生混凝土经破碎分级后成为再生骨料，再生骨料表面附着大量硬化水泥砂浆，吸水率高，微裂纹多，质量差，因此，要将再生骨料应用于再生混凝土的生产，需要将再生骨料强化预处理。Recycling and recycling a large amount of waste concrete, that is, recycled concrete technology, is generally considered to be the most effective measure to solve the problem of waste concrete. Recycled concrete becomes recycled aggregate after crushing and grading. A large amount of hardened cement mortar is attached to the surface of recycled aggregate, which has high water absorption rate, many microcracks, and poor quality. Therefore, to apply recycled aggregate to the production of recycled concrete, it is necessary to use recycled bone Material intensive pretreatment.
用化学试剂对再生骨料进行浸泡预处理的原理是利用酸液与再生骨料表面的硬化水泥砂浆产生化学反应，进而去除骨料表面的硬化水泥砂浆，常用的化学试剂为酸性溶液，包括硫酸、盐酸、磷酸、草酸等，目前关于醋酸浸泡处理再生骨料的文献和专利不多，关于再生骨料酸液浸泡处理的研究多集中在盐酸、磷酸等强酸，如陈美祝等人在文章《再生粗骨料物理性能强化改性研究》中提出水泥水化产物与盐酸反应后溶解，使再生骨料表面平整光滑，孔隙率降低，吸水率减小；专利一种再生骨料的改性方法及改性再生混凝土，专利号CN201510805274，利用质量浓度为5％～8％的磷酸溶液浸泡再生骨料制备改性再生骨料，提高再生混凝土性能。此类强酸在实际使用中存在安全隐患，且强酸易对骨料造成损害，其次，浸泡后的废液废渣无法有效回收利用。本发明先利用稀醋酸对再生骨料表面进行处理，在几乎不在骨料表面产生酸性残留的前提下改性再生骨料，再将酸处理产生的废弃物合理利用到混凝土的生产中，有效节约资源，保护环境。The principle of immersion pretreatment of recycled aggregates with chemical reagents is to use acid to react with hardened cement mortar on the surface of recycled aggregates, and then remove the hardened cement mortar on the surface of aggregates. Commonly used chemical reagents are acidic solutions, including sulfuric acid , hydrochloric acid, phosphoric acid, oxalic acid, etc. At present, there are not many literatures and patents on the soaking treatment of recycled aggregates in acetic acid. Research on Strengthening and Modification of Coarse Aggregate Physical Properties proposes that the cement hydration product reacts with hydrochloric acid and then dissolves to make the surface of the recycled aggregate smooth, reduce the porosity, and reduce the water absorption; patent a modification method of recycled aggregate and Modified recycled concrete, patent number CN201510805274, uses a phosphoric acid solution with a mass concentration of 5% to 8% to soak recycled aggregates to prepare modified recycled aggregates to improve the performance of recycled concrete. This kind of strong acid has potential safety hazards in actual use, and the strong acid is easy to cause damage to the aggregate. Secondly, the waste liquid and residue after soaking cannot be effectively recycled. In the present invention, dilute acetic acid is used to treat the surface of the recycled aggregate first, and the recycled aggregate is modified on the premise that no acid residue is generated on the surface of the aggregate, and then the waste generated by the acid treatment is rationally used in the production of concrete, effectively saving resources and protect the environment.
发明内容Contents of the invention
技术问题：本发明要解决的技术问题是提供一种再生骨料强化处理的方法，该方法解决再生骨料表面附着老化水泥砂浆、吸水率高、质量差、处理过程中产生的废弃物无法得到有效回收利用的问题。Technical problem: The technical problem to be solved by the present invention is to provide a method for intensified treatment of recycled aggregates, which solves the problems of aging cement mortar attached to the surface of recycled aggregates, high water absorption, poor quality, and unavailable waste generated during the treatment process. The problem of efficient recycling.
技术方案：为实现上述目的，本发明的处理再生骨料的方法采用以下步骤实现：Technical solution: In order to achieve the above purpose, the method for processing recycled aggregate of the present invention is realized by the following steps:
1)将再生骨料置于稀醋酸溶液中浸泡，浸泡时长为12～36h；1) Soak the recycled aggregate in dilute acetic acid solution for 12-36 hours;
2)浸泡结束后，将浸泡后的再生骨料捞出自然晾干；2) After soaking, take out the soaked recycled aggregate and dry it naturally;
3)将晾干的再生骨料进行机械振动处理，回收骨料表面的再生渣；3) Mechanically vibrate the dried recycled aggregate to recover the recycled slag on the surface of the aggregate;
4)对浸泡后的浑浊废液进行沉淀处理，得到澄清液和再生渣；4) Precipitate the turbid waste liquid after soaking to obtain clarified liquid and regenerated slag;
5)将再生渣自然晾干研磨后备用；5) Dry the recycled slag naturally and grind it for later use;
6)将澄清液用作混凝土拌和水、再生渣用作填料拌和混凝土。6) The clarified liquid is used as concrete mixing water, and the recycled slag is used as filler to mix concrete.
其中，in,
所述再生骨料为再生混凝土经破碎分级后成的再生粗骨料，粒径范围5～40mm。The recycled aggregate is recycled coarse aggregate obtained by crushing and grading recycled concrete, and the particle size ranges from 5 to 40 mm.
所述步骤1)所用的稀醋酸溶液质量浓度为0.6～1.8％。The mass concentration of dilute acetic acid solution used in the step 1) is 0.6-1.8%.
所述步骤1)中将再生骨料置于稀醋酸溶液中浸泡，稀醋酸溶液要将再生骨料完全浸没。In the step 1), the regenerated aggregate is soaked in dilute acetic acid solution, and the dilute acetic acid solution must completely submerge the regenerated aggregate.
所述步骤4)中的沉淀时长为24～168h。The precipitation time in the step 4) is 24 to 168 hours.
所述步骤5)中得到的再生渣烘干研磨5～10min后为比表面积为300～500m2/kg的粉料。The regenerated slag obtained in the step 5) is dried and ground for 5-10 minutes to become a powder with a specific surface area of 300-500 m 2 /kg.
所述步骤4)产生的澄清液的主要成分为醋酸钙，pH值为4.6～5.8。The main component of the clarified liquid produced in the step 4) is calcium acetate, and the pH value is 4.6-5.8.
所述步骤6)再生渣用于拌和混凝土用量为取代胶凝材料5～20％。In the step 6), the amount of recycled slag used for mixing concrete is to replace 5-20% of the cementitious material.
有益效果：1)稀醋酸可以和再生骨料表面附着的水泥砂浆发生化学反应，进而去除骨料表面的部分水泥砂浆，降低再生骨料吸水率，改善再生骨料质量；2)再生骨料经过稀醋酸浸泡处理性能得到改善，且骨料本身不会受到腐蚀，浸泡后不会在骨料表面残留强酸，无需经过清水反复冲洗，节约资源；3)稀醋酸浸泡再生骨料的过程中产生副产品废液废渣，均能应用于混凝土的拌和中；4)主要成分为醋酸钙的浸泡废液用作砂浆的拌和水能为水泥水化提供钙源，显著提高混凝土的强度；5)主要成分为醋酸钙的浸泡废液作拌和水能改善混凝土的额工作性能；6)该方法适用于混凝土搅拌站，实际应用性强；7)整个处理过程无废物产生，能耗低，有利于节约资源，保护环境。Beneficial effects: 1) Dilute acetic acid can chemically react with the cement mortar attached to the surface of the recycled aggregate, thereby removing part of the cement mortar on the surface of the aggregate, reducing the water absorption rate of the recycled aggregate, and improving the quality of the recycled aggregate; 2) The recycled aggregate is processed The performance of dilute acetic acid soaking treatment is improved, and the aggregate itself will not be corroded. After soaking, no strong acid will remain on the surface of the aggregate, and there is no need to rinse repeatedly with clean water, saving resources; 3) By-products are produced during the process of soaking recycled aggregates in dilute acetic acid Waste liquid and waste residue can be used in the mixing of concrete; 4) The soaking waste liquid whose main component is calcium acetate is used as the mixing water of mortar to provide calcium source for cement hydration and significantly improve the strength of concrete; 5) The main component is The immersion waste liquid of calcium acetate is used as mixing water to improve the working performance of concrete; 6) the method is suitable for concrete mixing plants, and has strong practical applicability; 7) the whole treatment process has no waste generation, low energy consumption, and is conducive to saving resources. protect environment.
具体实施方式Detailed ways
本发明是一种再生骨料强化处理的方法，采用以下步骤实现：The present invention is a method for strengthening treatment of recycled aggregate, which is realized by the following steps:
1)将再生骨料置于稀醋酸溶液中浸泡，浸泡时长为12～36h；1) Soak the recycled aggregate in dilute acetic acid solution for 12-36 hours;
2)浸泡结束后，将浸泡后的再生骨料捞出自然晾干；2) After soaking, take out the soaked recycled aggregate and dry it naturally;
3)将晾干的再生骨料进行机械振动处理，回收骨料表面的再生渣；3) Mechanically vibrate the dried recycled aggregate to recover the recycled slag on the surface of the aggregate;
4)对浸泡后的浑浊废液进行沉淀处理，得到澄清液和再生渣；4) Precipitate the turbid waste liquid after soaking to obtain clarified liquid and regenerated slag;
5)将再生渣自然晾干研磨后备用；5) Dry the recycled slag naturally and grind it for later use;
6)将澄清液用作混凝土拌和水、再生渣用作填料拌和混凝土。6) The clarified liquid is used as concrete mixing water, and the recycled slag is used as filler to mix concrete.
所述的再生骨料为再生混凝土经破碎分级后成的再生粗骨料，粒径范围5～40mm。The regenerated aggregate is regenerated coarse aggregate obtained by crushing and grading recycled concrete, and the particle size ranges from 5 to 40 mm.
所述的步骤1)所用的稀醋酸溶液质量浓度为0.6～1.8％。The mass concentration of dilute acetic acid solution used in the step 1) is 0.6-1.8%.
所述的步骤1)稀醋酸溶液能将再生骨料完全浸没。The step 1) dilute acetic acid solution can completely submerge the recycled aggregate.
所述的步骤3)中的沉淀时长为24～168h。The precipitation time in the step 3) is 24-168 hours.
所述的步骤5)中得到的再生渣烘干研磨5～10min后为比表面积为300～500m2/kg的粉料。The regenerated slag obtained in the step 5) is dried and ground for 5-10 minutes to become a powder with a specific surface area of 300-500 m 2 /kg.
所述的步骤4)产生的澄清液的主要成分为醋酸钙，pH值为4.6～5.8。The main component of the clarified liquid produced in the step 4) is calcium acetate, and the pH value is 4.6-5.8.
所述的步骤6)再生渣用于拌和混凝土用量为取代胶凝材料5～20％。In the step 6), the amount of recycled slag used for mixing concrete is 5-20% to replace the cementitious material.
实施例1Example 1
一种再生骨料强化处理的方法：将再生骨料置于质量浓度为0.6％的稀醋酸溶液中浸泡36h，浸泡结束后将再生骨料捞出自然晾干，堆放备用，即可得强化再生骨料。对浸泡后的浑浊废液进行沉淀处理，静置24小时，得到澄清液和再生渣，将再生渣自然晾干后，研磨5min至比表面积为300m2/kg备用。A method for intensified treatment of recycled aggregates: soak recycled aggregates in dilute acetic acid solution with a mass concentration of 0.6% for 36 hours, remove the recycled aggregates after soaking to dry naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the turbid waste liquid after soaking, and let it stand for 24 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 5 minutes until the specific surface area is 300m 2 /kg for later use.
实施例2Example 2
一种再生骨料强化处理的方法：将再生骨料置于质量浓度为1.8％的稀醋酸溶液中浸泡12h，浸泡结束后将再生骨料捞出自然晾干，堆放备用，即可得强化再生骨料。对浸泡后的浑浊废液进行沉淀处理，静置168小时，得到澄清液和再生渣，将再生渣自然晾干后，研磨10min至比表面积为500m2/kg备用。A method for intensified treatment of recycled aggregates: soak recycled aggregates in dilute acetic acid solution with a mass concentration of 1.8% for 12 hours, remove the recycled aggregates after soaking, dry them naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the turbid waste liquid after soaking, and let it stand for 168 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 10 minutes until the specific surface area is 500m 2 /kg for later use.
实施例3Example 3
一种再生骨料强化处理的方法：将再生骨料置于质量浓度为1.2％的稀醋酸溶液中浸泡24h，浸泡结束后将再生骨料捞出自然晾干，堆放备用，即可得强化再生骨料。对浸泡后的浑浊废液进行沉淀处理，静置96小时，得到澄清液和再生渣，将再生渣自然晾干后，研磨8min至比表面积为400m2/kg备用。A method for intensive treatment of recycled aggregates: soak the recycled aggregates in a dilute acetic acid solution with a mass concentration of 1.2% for 24 hours, remove the recycled aggregates after soaking, dry them naturally, and stack them for later use to obtain enhanced regeneration aggregate. Precipitate the soaked turbid waste liquid and let it stand for 96 hours to obtain clarified liquid and regenerated slag. After drying the regenerated slag naturally, grind it for 8 minutes until the specific surface area is 400m 2 /kg for later use.
对比例1Comparative example 1
未经稀醋酸浸泡处理的再生骨料。Regenerated aggregates that have not been soaked in dilute acetic acid.
表1 再生骨料性能Table 1 Performance of recycled aggregate
对比例1Comparative example 1
未经稀醋酸浸泡强化处理的再生骨料。Regenerated aggregates that have not been strengthened by dipping in dilute acetic acid.
从实施例1～3和对比例1可以看出，经稀醋酸浸泡强化的再生骨料相比未经稀醋酸浸泡处理的再生骨料，吸水率、表观密度和压碎指标三项基本性能都有不同程度的改善。其中吸水率降低了12％～43％，表观密度提高了6％～9％，压碎指标降低了15％～30％。From Examples 1 to 3 and Comparative Example 1, it can be seen that the recycled aggregate strengthened by immersion in dilute acetic acid has three basic properties of water absorption, apparent density and crushing index compared with the recycled aggregate without immersion in dilute acetic acid. All have improved to varying degrees. Among them, the water absorption rate is reduced by 12% to 43%, the apparent density is increased by 6% to 9%, and the crushing index is reduced by 15% to 30%.
实施例4Example 4
一种再生骨料强化处理的方法：将实施例1产生的澄清液和再生渣用于混凝土的拌和中，每立方米混凝土包括以下重量份的原料：水泥343份，细骨料760份，粗骨料1102份，拌和水165份，再生渣18份，其中细骨料采用2区中砂，粗骨料采用最大粒径不超过31.5mm的连续级配碎石。A method for strengthening treatment of recycled aggregates: the clarified liquid and recycled slag produced in Example 1 are used in the mixing of concrete, and each cubic meter of concrete includes the following raw materials in parts by weight: 343 parts of cement, 760 parts of fine aggregate, coarse 1102 parts of aggregate, 165 parts of mixing water, and 18 parts of recycled slag, of which the fine aggregate is medium sand in zone 2, and the coarse aggregate is continuously graded crushed stone with a maximum particle size of no more than 31.5mm.
实施例5Example 5
一种再生骨料强化处理的方法：将实施例2产生的澄清液和再生渣用于混凝土的拌和中，每立方米混凝土包括以下重量份的原料：水泥289份，细骨料760，粗骨料1102份，拌和水165份，再生渣72份，其中细骨料采用2区中砂，粗骨料采用最大粒径不超过31.5mm的连续级配碎石。A method for strengthening treatment of recycled aggregates: the clarified liquid and recycled slag produced in Example 2 are used in the mixing of concrete, and each cubic meter of concrete includes the following raw materials in parts by weight: 289 parts of cement, 760 parts of fine aggregate, 760 parts of coarse bone 1102 parts of raw materials, 165 parts of mixing water, and 72 parts of regenerated slag, of which the fine aggregate is medium sand in Zone 2, and the coarse aggregate is continuously graded crushed stone with a maximum particle size of no more than 31.5mm.
实施例6Example 6
一种再生骨料强化处理的方法：将实施例3产生的澄清液和再生渣用于混凝土的拌和中，每立方米混凝土包括以下重量份的原料：水泥318份，细骨料708份，粗骨料1102份，拌和水165份，再生渣43份，其中细骨料采用2区中砂，粗骨料采用最大粒径不超过31.5mm的连续级配碎石。A method for strengthening treatment of recycled aggregates: the clarified liquid and recycled slag produced in Example 3 are used in the mixing of concrete, and each cubic meter of concrete includes the following raw materials in parts by weight: 318 parts of cement, 708 parts of fine aggregate, coarse 1102 parts of aggregate, 165 parts of mixing water, and 43 parts of regenerated slag, of which the fine aggregate is medium sand in zone 2, and the coarse aggregate is continuously graded crushed stone with a maximum particle size of no more than 31.5mm.
对比例2Comparative example 2
和对比例2相比，实施例4～6制得的混凝土的7天、28天和90天抗折和抗压强度均有不同程度的提高，工作性能也得到不同程度的改善。Compared with Comparative Example 2, the 7-day, 28-day and 90-day flexural and compressive strengths of the concrete prepared in Examples 4-6 are all improved to varying degrees, and the workability is also improved to varying degrees.
本发明1)稀醋酸可以和再生骨料表面附着的水泥砂浆发生化学反应，进而去除骨料表面的部分水泥砂浆，降低再生骨料吸水率，改善再生骨料质量；2)再生骨料经过稀醋酸浸泡处理性能得到改善，且骨料本身不会受到腐蚀，浸泡后不会在骨料表面残留强酸，无需经过清水反复冲洗，节约资源；3)稀醋酸浸泡再生骨料的过程中产生副产品废液废渣，均能应用于混凝土的拌和中；4)主要成分为醋酸钙的浸泡废液用作砂浆的拌和水能为水泥水化提供钙源，显著提高混凝土的强度；5)主要成分为醋酸钙的浸泡废液作拌和水能改善混凝土的额工作性能；6)该方法适用于混凝土搅拌站，实际应用性强；7)整个处理过程无废物产生，能耗低，有利于节约资源，保护环境。The present invention 1) dilute acetic acid can chemically react with the cement mortar attached to the surface of the recycled aggregate, and then remove part of the cement mortar on the surface of the aggregate, reduce the water absorption rate of the recycled aggregate, and improve the quality of the recycled aggregate; The performance of soaking in acetic acid is improved, and the aggregate itself will not be corroded. After soaking, no strong acid will remain on the surface of the aggregate, and there is no need for repeated washing with clean water, saving resources; 4) The soaking waste liquid whose main component is calcium acetate is used as the mixing water of mortar to provide calcium source for cement hydration and significantly improve the strength of concrete; 5) The main component is acetic acid Calcium soaking waste liquid can be used as mixing water to improve the working performance of concrete; 6) This method is suitable for concrete mixing plants and has strong practical applicability; 7) No waste is generated during the entire treatment process, and energy consumption is low, which is conducive to saving resources and protecting surroundings.
本发明方案所公开的技术手段不仅限于上述实施方式所公开的技术手段，还包括由以上技术特征任意组合所组成的技术方案。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。The technical means disclosed in the solutions of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.
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| CN108911546A (en) * | 2018-09-25 | 2018-11-30 | 大连翼方科技有限公司 | A kind of recycled concrete producing device and method |
| CN109824323A (en) * | 2019-03-29 | 2019-05-31 | 湖南科技学院 | A kind of steel bamboo mixed fiber regeneration thermal insulation concrete and preparation method thereof |
| CN110054427A (en) * | 2019-04-28 | 2019-07-26 | 普定县银丰农业科技发展有限公司 | A method of building recycled aggregate is made using discarded concrete |
| CN110105014A (en) * | 2019-05-08 | 2019-08-09 | 温州市三箭混凝土有限公司 | A kind of high performance concrete and preparation method thereof |
| CN110105014B (en) * | 2019-05-08 | 2021-08-06 | 温州市三箭混凝土有限公司 | High-performance concrete and preparation method thereof |
| CN110078431A (en) * | 2019-06-03 | 2019-08-02 | 青岛中建富兴商砼有限公司 | Anti- isolation high-strength heat-insulating concrete of one kind and preparation method thereof |
| CN112645618A (en) * | 2020-12-27 | 2021-04-13 | 中南大学 | Method for recovering fine aggregate in waste concrete |
| CN113105171A (en) * | 2021-04-19 | 2021-07-13 | 东南大学 | Strengthening treatment method of recycled aggregate, low self-shrinkage mortar using recycled aggregate and preparation method thereof |
| CN113105171B (en) * | 2021-04-19 | 2022-07-29 | 东南大学 | Strengthening treatment method of recycled aggregate, low self-shrinkage mortar using recycled aggregate and preparation method thereof |
| CN113929381A (en) * | 2021-09-27 | 2022-01-14 | 河南城建学院 | Low-shrinkage recycled high-performance concrete and preparation method thereof |
| CN114057445A (en) * | 2021-10-25 | 2022-02-18 | 淮阴工学院 | Steam-cured concrete and preparation method thereof |
| CN117417159A (en) * | 2023-10-31 | 2024-01-19 | 山东旺峰新型建材有限公司 | A crack-resistant dry powder mortar using Yellow River sand as raw material and its preparation process |
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