Internal wall environment-friendly building block with high solid waste utilization rate and preparation method thereof

Abstract

The invention discloses an interior wall environment-friendly building block with high solid waste utilization rate and a preparation method thereof.The building block is composed of, by mass, 70-85% of recycled aggregate, 15-30% of cementing material, 0.5-1.3% of reinforced fiber and 1-3% of functional additive, the recycled aggregate is composed of 3-5mm coarse aggregate and 0-1.5 mm fine aggregate, the reinforced fiber system accounts for 0.5-1.3% of the total mass of dry materials, and the functional additive accounts for 1-3% of the total mass of dry materials. The cementing material comprises at least one synthetic or natural fiber, is compounded by S95-grade slag powder and II-grade fly ash according to the mass ratio of (1.5-2.5): 1, and can be doped with part of steel slag powder; the functional additive comprises a polycarboxylate superplasticizer or lignosulfonic acid glue and an excitant sodium sulfate. Through the collaborative design of the recycled aggregate, the superfine slag powder and the harmless fibers and the combination of acid pickling pretreatment and steam curing processes, the sound insulation performance is larger than or equal to 48 dB, the compressive strength is larger than or equal to 5 MPa, the solid waste utilization rate is larger than or equal to 80%, the building block meets the requirements of multiple scenes such as office buildings, factory buildings, machine rooms and hospitals, the comprehensive cost is smaller than or equal to 110 yuan / m, and the environment friendliness, safety and economical efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building materials, and particularly relates to an inner wall environment-friendly block taking building solid waste as a main raw material and a preparation method thereof, which is suitable for indoor partition walls of office buildings, residences, hotels and the like, and has high sound insulation performance, low cost, green environmental protection and wide scene adaptability. BACKGROUND

[0002] The conventional inner wall block has the following problems:

[0003] 1. Insufficient sound insulation performance: the air sound insulation of ordinary lightweight block is less than or equal to 45 dB, which is difficult to meet the sound insulation requirement (greater than or equal to 48 dB) of modern buildings;

[0004] 2. Low solid waste utilization rate: the content of construction waste in conventional inner wall materials is less than 20%, and the recycled aggregate is easy to cause wall cracking;

[0005] 3. Health hazards: some materials (such as glass fibers) release harmful dust during processing, which threatens the health of construction personnel;

[0006] 4. High cost: high-performance sound insulation blocks rely on high-priced additives (such as rubber particles), and the comprehensive cost is greater than or equal to 130 yuan / m³.

[0007] 5. Existing technology: glass fiber reinforced sound insulation block is used, but the fiber content is greater than or equal to 1.2%, which has dust hazards, and the solid waste utilization rate is only 65%.

[0008] 6. In the traditional aerated concrete block, the content of construction waste is less than or equal to 30%, the sound insulation is less than or equal to 45 dB (GB / T 19889.3-2005), and the cement content is greater than or equal to 200 kg / m³, and the carbon emission is greater than or equal to 80 kg CO2 / m³. Therefore, it is urgent to design a high solid waste utilization rate inner wall environment-friendly block and a preparation method thereof. SUMMARY

[0009] (I) Technical problems solved

[0010] In view of the deficiencies of the prior art, the present application provides a high solid waste utilization rate inner wall environment-friendly block and a preparation method thereof, which solves the technical problems of insufficient sound insulation performance, low solid waste utilization rate and insufficient environmental protection of the prior art.

[0011] (II) Technical solutions

[0012] To achieve the above purpose, the present application is implemented by the following technical solutions: a high solid waste utilization rate inner wall environment-friendly block is composed of the following mass percentage components:

[0013] Recycled aggregate 70-85%;

[0014] Cementitious material 15-30%;

[0015] Reinforcing fiber 0.5-1.3%;

[0016] Functional additives 1-3%;

[0017] The waste utilization rate of the block is ≥80%, the sound insulation amount is ≥48dB, and the compressive strength is ≥5MPa.

[0018] As a further preferred mode of the present application, the recycled aggregate comprises coarse aggregate of 3-5mm and fine aggregate of 0-1.5mm.

[0019] As a further preferred mode of the present application, the reinforcing fiber is a reinforcing fiber system: 0.5-1.3% of the total mass of dry materials, including at least one of recycled PET fiber, basalt fiber and coconut shell fiber, the recycled PET fiber is derived from waste plastic bottle crushing and recycling, the length is ≤3mm, and the tensile strength is ≥300MPa.

[0020] As a further preferred mode of the present application, the cementitious material is composed of S95 grade slag powder and II grade fly ash, the mass ratio is (1.5-2.5):1, and the steel slag powder with a specific surface area of 400m² / kg can replace part of the slag powder.

[0021] As a further preferred mode of the present application, the functional additives include water reducing agent and activator, the water reducing agent is polycarboxylic acid water reducing agent or lignin sulfonic acid glue, and the activator is sodium sulfate.

[0022] As a further preferred mode of the present application, the specific steps include the following steps,

[0023] S1, raw material pretreatment: pickling of recycled aggregate to remove surface impurities and improve interface adhesion; fiber cutting to ≤3mm and modification treatment;

[0024] S2, dry mixing: pre-mixing of aggregate, cementitious material and fiber for 3-5 minutes;

[0025] S3, wet mixing: adding activator and water reducing agent, and stirring until the slurry flow is ≥150mm;

[0026] S4, forming: vibration pressing forming, pressure 1-3MPa, frequency 20-30Hz×30-60s;

[0027] S5, curing: steam curing, 60-80℃×4-8h, and then natural curing for 7 days.

[0028] As a further preferred mode of the present application, in step S1, during the pickling process, 3-7% hydrochloric acid is used for pickling for 1-3 hours.

[0029] As a further preferred mode of the present application, in step S1, the surface modifier is a silane coupling agent, and the coating amount is 0.3-0.7% of the mass of the fiber.

[0030] (III) Beneficial Effects

[0031] The present application provides a high solid waste utilization rate interior wall environment-friendly block and a preparation method thereof.

[0032] The compressive strength is greater than or equal to 5MPa (GB / T 11969-2020); the fire resistance limit is greater than or equal to 2h (ISO 834);

[0033] Two, environmental protection and safety: solid waste utilization rate is greater than or equal to 80% (recycled aggregate + slag powder + industrial by-product silicon aluminum material); harmless fiber is used, and the construction dust hazard is significantly reduced;

[0034] Three, cost optimization: the comprehensive cost is less than or equal to 110 yuan / m3, which is reduced by 20-30% compared with the traditional scheme. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The present application is a method flow diagram. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] Please refer to Figure 1 The present application provides a technical solution: a high solid waste utilization rate interior wall environment-friendly block, which is composed of the following mass percentage components:

[0038] Recycled aggregate 70-85%;

[0039] Cementing material 15-30%;

[0040] Reinforcing fiber 0.5-1.3%;

[0041] Functional additive 1-3%;

[0042] The block solid waste utilization rate is greater than or equal to 80%, the sound insulation amount is greater than or equal to 48dB, and the compressive strength is greater than or equal to 5MPa.

[0043] The recycled aggregate includes coarse aggregate of 3-5mm and fine aggregate of 0-1.5mm.

[0044] The reinforcing fiber is a reinforcing fiber system: 0.5-1.3% of the total mass of dry materials, containing at least one synthetic or natural fiber (such as recycled PET fiber, basalt fiber, coconut shell fiber), the recycled PET fiber is derived from waste plastic bottle crushing and recycling, the length is ≤3mm, and the tensile strength is ≥300MPa.

[0045] The cementing material is composed of S95 grade slag powder and grade II fly ash, the mass ratio is (1.5-2.5):1, and the steel slag powder with a specific surface area of 400m² / kg can replace part of the slag powder.

[0046] The functional additives include water reducing agent and activator, the water reducing agent is polycarboxylic acid water reducing agent or lignosulfonate glue, and the activator is sodium sulfate.

[0047] A preparation method of an environmentally friendly inner wall building block with high solid waste utilization rate, the specific steps comprising the following steps,

[0048] S1, raw material pretreatment: pickling to remove surface impurities of recycled aggregate, and improve the interfacial adhesion; cut the fiber to ≤3mm and modify it;

[0049] S2, dry mixing: pre-mixing the aggregate, cementing material and fiber for 3-5 minutes;

[0050] S3, wet mixing: adding activator and water reducing agent, and stirring until the slurry flow degree is ≥150mm;

[0051] S4, forming: vibration pressing forming, pressure 1-3MPa, frequency 20-30Hz×30-60s;

[0052] S5, curing: steam curing, 60-80℃×4-8h, and then natural curing for 7 days.

[0053] In step S1, during the pickling process, 3-7% hydrochloric acid is used for pickling for 1-3 hours.

[0054] In step S1, the surface modifier is a silane coupling agent, and the coating amount is 0.3-0.7% of the mass of the fiber.

[0055] Example one, standard sound insulation type inner wall building block

[0056] Raw material ratio (mass percentage):

[0057] Recycled coarse aggregate (3-5mm) 45%, recycled fine aggregate (0-1.5mm) 35%;

[0058] Slag powder (S95 grade) 25%, fly ash (II grade) 15%;

[0059] Recycled PET fiber (length ≤3mm) 0.5%, basalt fiber 0.3%.

[0060] Lignin sulfonic acid glue 1.5%, sodium sulfate 0.3%.

[0061] Preparation process:

[0062] The aggregate was pickled with 5% hydrochloric acid for 2 hours, and the fiber was coated with 0.5% silane coupling agent;

[0063] After dry mixing for 3 minutes, wet mixing for 5 minutes, vibration pressing (2 MPa, 25 Hz x 30 s);

[0064] After steam curing (70°C x 5h), natural curing for 7 days.

[0065] Performance test:

[0066] Sound insulation: 53 dB; compressive strength: 6.3 MPa; solid waste utilization rate: 85%.

[0067] According to the calculation, the use of cement per m³ of block is reduced by 220 kg, which is equivalent to reducing carbon by 183 kg CO2, and the carbon emission of the whole life cycle is 22 kg CO2 / m³.

[0068] Example two: low-cost coconut shell fiber reinforced

[0069] Recycled aggregate: 85% (coarse aggregate 70%, fine aggregate 30%)

[0070] Cementitious material: 13% (slag powder and fly ash ratio 2.5:1)

[0071] Reinforcing fiber: 1.2% (coconut shell fiber 0.8%, basalt fiber 0.4%)

[0072] Functional additives: 1.8% (lignin sulfonic acid glue 1%, sodium sulfate 0.8%)

[0073] Process flow:

[0074] Pickling: 3% hydrochloric acid for 1 hour;

[0075] Fiber cutting to 3mm, silane coupling agent coating rate 0.6%;

[0076] Slurry fluidity reached 155mm;

[0077] Vibration pressing for 40 seconds, frequency 28 Hz, pressure 2.5 MPa;

[0078] Curing temperature 65°C, lasting 6h.

[0079] Test results:

[0080] Sound insulation 49dB, compressive strength 5.2MPa, cost 98yuan / m³.

[0081] Example 3: High fluidity pumping type

[0082] Recycled aggregate: 75% (coarse-fine ratio 1:1)

[0083] Cementitious material: 22% (slag powder: fly ash = 1.8:1)

[0084] Reinforcing fiber: 0.8% (recycled PET fiber 0.5%, basalt fiber 0.3%)

[0085] Functional additives: 2.2% (polycarboxylic acid water reducer 0.8%, sodium sulfate 1.4%)

[0086] Preparation conditions:

[0087] Hydrochloric acid concentration: 6%, treatment time 3 hours;

[0088] Silane coupling agent coating amount: 0.4%;

[0089] Slurry fluidity reaches 165 mm;

[0090] Pressing frequency 30 Hz, pressure 3 MPa, time 45 seconds;

[0091] Steam curing temperature 80°C, duration 8 hours.

[0092] Performance test:

[0093] Suitable for mechanized construction, compressive strength 5.8 MPa, sound insulation 51 dB.

[0094] Example 4: High fire resistance type

[0095] Adjust the formula: increase basalt fiber to 0.8%, add aluminate cement 3%; increase the proportion of slag powder to 30%.

[0096] Performance: fire resistance limit 2.8h, sound insulation 51dB.

[0097] Environmental contribution of the invention

[0098] Each 100,000 m³ of block application can reduce CO2 emissions ≈6300 tons, equivalent to saving 2500 tons of standard coal.

[0099] The whole life cycle carbon emissions of the block ≤25 kg CO2 / m³, of which the replacement rate of slag powder and fly ash for cement ≥60%.

[0100] Life cycle data:

[0101]

[0102] The foregoing merely illustrates the principles of the application and application of its leading features. This application is not limited to the illustrative embodiments shown and described herein. Rather, the scope of the present application is defined by the appended claims, and other embodiments of this application will readily occur to those skilled in the art. Accordingly, the application is not limited to that described in the foregoing description or illustrated in the accompanying drawings. It is intended to cover any adaptations or variations of proven equivalents to a readily available materials and of the application including its operation and uses of benefits and / or combinations of the adaptations and variations. Therefore, it is manifestly intended that this application be limited only by the embodiments of the claims based on the patentability of the patent claims.

[0103] In addition, it should be understood that, although the description herein is based upon embodiments, not every embodiment contains only one independent technical solution, and the description herein is only for the sake of clarity, and those skilled in the art should understand the description as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An environmentally friendly interior wall building block with high solid waste utilization rate, characterized by: It is composed of the following components in percentage by mass: Recycled aggregate 70-85%; Cementitious materials 15-30%; Reinforcement fiber 0.5-1.3%; Functional additives 1-3%; The building blocks have a solid waste utilization rate of ≥80%, a sound insulation value of ≥48dB, and a compressive strength of ≥5MPa.

2. The high solid waste utilization rate interior wall environmentally friendly building block according to claim 1, characterized in that: The recycled aggregate comprises 3-5 mm coarse aggregate and 0-1.5 mm fine aggregate.

3. The high solid waste utilization rate interior wall environmentally friendly building block according to claim 1, characterized in that: The reinforcing fiber is a reinforcing fiber system: accounting for 0.5-1.3% of the total mass of the dry material, including at least one of recycled PET fiber, basalt fiber and coconut shell fiber, the recycled PET fiber is derived from the crushing and regeneration of waste plastic bottles, has a length of ≤3mm, and a tensile strength of ≥300MPa.

4. The high solid waste utilization rate interior wall environmentally friendly building block according to claim 1, characterized in that: The cementitious material is composed of S95 grade slag powder and II grade fly ash, with a mass ratio of (1.5-2.5):

1. Steel slag powder with a specific surface area of ​​400m² / kg can replace part of the slag powder.

5. The environmentally friendly interior wall building block with high solid waste utilization rate according to claim 1, characterized in that: The functional additives include a water reducer and an activator. The water reducer is a polycarboxylate water reducer or lignin sulfonic acid glue, and the activator is sodium sulfate.

6. A method for preparing the environmentally friendly interior wall building blocks with high solid waste utilization rate according to claims 1-5, characterized in that: The specific steps include the following steps, S1, raw material pretreatment: recycled aggregate is pickled to remove surface impurities and improve interface bonding; fiber is cut to ≤3mm and modified; S2, dry mixing: premixing aggregate, cementitious materials and fibers for 3-5 minutes; S3, wet mixing: add activator and water reducer, and stir until the slurry fluidity is ≥150mm; S4, molding: vibration pressing molding, pressure 1-3 MPa, frequency 20-30 Hz × 30-60 s; S5, curing: steam curing, 60-80℃×4-8h, then natural curing for 7 days.

7. The method for preparing an environmentally friendly interior wall building block with high solid waste utilization rate according to claim 6, characterized in that: In step S1, during the pickling process, 3-7% hydrochloric acid is used for pickling for 1-3 hours.

8. The method for preparing an environmentally friendly interior wall building block with high solid waste utilization rate according to claim 6, characterized in that: In step S1, the surface modifier is a silane coupling agent, and the coating amount is 0.3-0.7% of the fiber mass.

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