A kind of thermal damage isolation material for deep-heat shaft and its preparation method
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A technology of insulating material and deep thermal well, which is used in vertical shaft equipment, earth-moving drilling, ceramic products, etc. problems, to achieve the effect of not easily broken or excessive deformation, good mechanical strength, and inhibition of shrinkage cracking
Active Publication Date: 2022-03-25
HENAN POLYTECHNIC UNIV
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Problems solved by technology
The existing downhole heat insulation materials mostly use foam glass, foam aluminum, foam ceramics, etc. The price of heat insulation and flame retardant materials is high, the production energy consumption is high, and the life cycle is short
Granular loose insulation materials such as expanded perlite have high water absorption and are loose and difficult to use
Especially when applied to surrounding rocks in deep wells, the above-mentioned materials have low compressive and flexural strength, and are easy to be fractured and broken, forming crack channels, reducing or even failing to achieve heat insulation effect
Method used
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Embodiment 1
[0027] The first step is to weigh 300 kg of modified fly ash, 700 kg of ordinary Portland cement, 900 kg of medium coarse sand, 10 kg of polypropylene fiber (organic fiber), 10 kg of additives, and 15 kg of early strength by mass parts CaCl 2 , 450 kg of water, 6 kg of compound blowing agent;
[0028] In the second step, put the modified fly ash, ordinary Portland cement, and medium-coarse sand into the container built in the concrete mixer for pre-mixing according to the weight of the first step, and then add organic fibers and additives to the mixer In the container, stir the material until the mixture is uniform; the fly ash in this embodiment adopts the fly ash that meets the grade I or grade II in "Fly Ash for Silicate Building Products", in order to achieve the same type of foam concrete material Compressive strength, using physical activation and chemical activator to modify the fly ash; physical activation in this example, using the jet mill produced by NETZSCH Mechan...
Embodiment 2
[0038] The first step is to weigh 200 kilograms of modified fly ash, 800 kilograms of ordinary Portland cement, 1000 kilograms of medium coarse sand, 15 kilograms of polypropylene fiber (organic fiber), 10 kilograms of additives, and 15 kilograms of early strength by mass parts. CaCl 2 , 500 kg of water, 8 kg of compound foaming agent; early strength agent CaCl 2 15 kg and 500 kg of water, 8 kg of compound foaming agent;
[0039] In the second step, put the modified fly ash, ordinary Portland cement, and medium-coarse sand into the container built in the concrete mixer for pre-mixing according to the parts by weight of the first step, and then add organic fibers and additives to the mixer In a container, stir the ingredients until the mixture is homogeneous;
[0040] In the third step, the early strength agent CaCl 2 Mix well with water, then pour it into the container in the second step, and start the mixer to fully mix it into cement mortar;
[0041] The fourth step is ...
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Abstract
The invention discloses a thermal damage isolation material for deep-heat shafts and a preparation method thereof, and belongs to the fields of heat damage control of mine surrounding rocks and building thermal environment. It includes the following components in parts by weight, modified fly ash 0-300, cement 100-800, medium coarse sand 500-900, water 300-600, organic fiber 10-15, early strength agent 5-15, compound With foaming agent 3-15, additive 5-10. The present invention selects the modified fly ash that has been physically activated and chemically excited, so that more active pozzolans in the fly ash can participate in the hydration reaction, effectively saving the amount of high-grade cement, and improving the workability of the mixture. Reduce heat of hydration and thermal expansion, improve compression resistance and impermeability; the present invention uses organic fibers and additives to enhance flexural strength and deformability, and can effectively inhibit shrinkage and cracking; the thermal conductivity is determined to be 0.08-0.18 W / (m·K), has excellent thermal damage barrier ability; the invention has simple formula, long foam stabilization time and low thermal conductivity, and is suitable for thermal insulation of underground tunnels, external walls and non-load-bearing walls.
Description
technical field [0001] The invention can be used for thermal insulation of surrounding rocks and external walls of deep-heat wells, so as to achieve the purpose of heat damage control, energy saving and emission reduction, and belongs to the technical field of heat damage control of mine surrounding rocks and building thermal environment, in particular to a deep-heat well Lane heat hazard insulation material and preparation method thereof. Background technique [0002] The high-temperature thermal environment hazards in deep-heat mines mainly include: ① seriously infringing on the physical and mental health of miners; ② reducing labor productivity; ③ affecting the safe production of enterprises. With the increase of mine mining depth, heat damage becomes more and more serious, among which the heat transfer of surrounding rock is one of the main causes of roadway heat damage. During roadway excavation and the ventilation system has not yet formed a loop, in addition to mecha...
Claims
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