Preparation method of ground source heat pump drilling backfilling material

A ground source heat pump and raw material technology, applied in the field of ground source heat pump, can solve the problem of high cost, and achieve the effects of reducing emissions, reducing costs, and easily obtaining raw materials

Active Publication Date: 2017-06-20

SHANDONG JIANZHU UNIV

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AI-Extracted Technical Summary

Problems solved by technology

However, the thermal conductivity of existing backfill ma...

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Abstract

The invention provides a preparation method of a ground source heat pump drilling backfilling material. A high-performance backfilling material for a buried pipe heat exchanger is prepared by utilizing industrial tailings so as to have higher thermal conductivity, better fluidity, water retention and slight expansion and stronger impermeability. The ground source heat pump drilling backfilling material is prepared from the following raw materials in parts by weight: 1.0 part of portland cement, 0-0.3 part of fly ash, 0.1-0.3 part of steel slag micropowder, 0-0.01 part of a defoamer, 0.05-0.15 part of an expansive agent, 0.05-0.15 part of bentonite, 0.002-0.020 part of a water reducing agent, 1.0-3.0 parts of a steel slag fine aggregate and 0.27-0.60 part of water. The preparation method has remarkable economic, social and environmental benefits and is simple in steps, convenient to operate and strong in practicability.

Technology Topic

Construction aggregateHeat pump +11

Examples

Experimental program(2)

Example Embodiment

[0060] Example 1

[0061] Raw materials: general Portland cement, fly ash, steel slag micropowder, defoamer, expansion agent, bentonite, water reducing agent, steel slag fine aggregate, water.

[0062] The mass ratios of the above components are: 1, 0.2, 0.2, 0.01, 0.08, 0.05, 0.004, 1.5, 0.43.

[0063] Cement: Ordinary Portland cement, strength class 52.5.

[0064] Fly ash: Class I fly ash

[0065] Steel slag powder: 0.08mm sieve residue percentage 0.6%, specific surface area 450kg/m 3

[0066] Defoamer: Silicone defoamer, non-toxic, tasteless, viscosity 1500Pa.s.

[0067] Expansion agent: UEA expansion agent, 7d limit expansion rate in water is 0.04%.

[0068] Bentonite: sodium-based bentonite, the swelling capacity is 40ml/g.

[0069] Water reducing agent: polycarboxylate water reducing agent, the water reducing rate is 25%.

[0070] Aggregate: The particle size is ≤1.18mm, and the aggregate gradation is shown in Table 2.

[0071] Table 2

[0072] Sieve size/mm Cumulative sieve residue/% 1.18 0 0.6 26 0.3 70 0.15 96

[0073] Water: Clean tap water.

[0074] Dry-mix cement, fly ash, aggregates and powdered admixtures uniformly, add water and stir for 2-4 minutes until the slurry is uniform, and then add liquid additives and stir for 2-4 minutes until uniform.

[0075] Product performance:

[0076] Fluidity: Initial: 300mm, 30min: 280mm

[0077] Compressive strength: 28d=85.2Mpa

[0078] Vertical expansion rate: 3h: 0.04%

[0079] The difference between 24h and 3h is 0.05%

[0080] Water retention rate: 99%

[0081] Impermeability grade: P10

[0082] Thermal conductivity: 2.49W/(m·K)

Example Embodiment

[0083] Example 2:

[0084] Raw materials: general Portland cement, fly ash, steel slag micropowder, defoamer, expansion agent, bentonite, water reducing agent, steel slag fine aggregate, water.

[0085] The mass ratios of the above components are: 1:0.3, 0.3, 0.005, 0.08, 0.08, 0.008, 1.5, 0.55.

[0086] Cement: Ordinary Portland cement, strength class 42.5.

[0087] Fly ash: Class II fly ash

[0088] Steel slag powder: 0.08mm sieve residue percentage 1.0%, specific surface area 390kg/m 3

[0089] Defoamer: Silicone defoamer, non-toxic, tasteless, viscosity 1000Pa.s.

[0090] Swelling agent: UEA swelling agent, 7d limit swelling rate in water is 0.03%.

[0091] Bentonite: Calcium-based bentonite, the expansion capacity is 20ml/g.

[0092] Water reducing agent: Nai series water reducing agent, the water reducing rate is 20%.

[0093] Steel slag fine aggregate: particle size is less than or equal to 1.18mm, and the aggregate gradation is shown in Table 3.

[0094] table 3

[0095] Sieve size/mm Cumulative sieve residue/% 1.18 0 0.6 30 0.3 75 0.15 98

[0096] Water: Clean tap water.

[0097] Dry-mix cement, fly ash, aggregates and powdered admixtures uniformly, add water and stir for 2-4 minutes until the slurry is uniform, and then add liquid additives and stir for 2-4 minutes until uniform.

[0098] Product performance:

[0099] Fluidity: Initial: 305mm, 30min: 285mm

[0100] Compressive strength: 28d=58.8Mpa

[0101] Vertical expansion rate: 3h: 0.03%

[0102] The difference between 24h and 3h is 0.08%

[0103] Water retention rate: 98%

[0104] Impermeability: P8

[0105] Thermal conductivity: 2.20W/(m·K)

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PUM

Property	Measurement	Unit
Viscosity	1500.0	pa·s
Expansion capacity	40.0	m
Particle size	<= 1.18	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Preparation method of ground source heat pump drilling backfilling material

A ground source heat pump and raw material technology, applied in the field of ground source heat pump, can solve the problem of high cost, and achieve the effects of reducing emissions, reducing costs, and easily obtaining raw materials

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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