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Lightweight thermal-insulation high-strength concrete and preparation method thereof

A high-strength concrete technology, applied in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., can solve the problems of complex production process of small ceramsite, increase the cost of concrete production, consume natural resources, etc., and achieve excellent bonding Performance and mechanical properties, enhance interface binding ability, solve the effect of not easy to disperse

Inactive Publication Date: 2021-07-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramsite still uses clay as the main raw material at present, which needs to consume a large amount of natural resources. Over time, the natural large ceramsite will not be enough, and the artificially prepared small ceramsite has a complicated production process and poor reliability. Solve the problems of energy saving and environmental protection
Although the overall performance of concrete can be improved to a certain extent by optimizing raw materials, reducing water-cement ratio, and improving curing conditions, the process is not complicated, and it is time-consuming and labor-intensive, which also increases the production cost of concrete as a whole.

Method used

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  • Lightweight thermal-insulation high-strength concrete and preparation method thereof
  • Lightweight thermal-insulation high-strength concrete and preparation method thereof
  • Lightweight thermal-insulation high-strength concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The light-weight thermal insulation high-strength concrete of the present invention comprises the following components: 270kg of cement, 130kg of ceramsite, 85kg of Class I fly ash, 360kg of cinder ash, 5.5kg of water reducer, foaming agent accounting for 5% of the cement mass, glass 0.7 kg of fiber, 0.7 kg of carbon fiber grafted with carbon nanotubes, and 110 kg of water. Among them, the cement is P.O42.5 ordinary Portland cement. The water-cement ratio is 0.45, the ceramsite is 5-10mm pre-wet crushed ceramsite, the type of water reducing agent is UC-III, the average length of glass fiber is about 20mm, and the average length of carbon fiber grafted with carbon nanotube is about 5mm . In the present invention, the large ceramsite refers to a particle size range of 20-25 mm, and the small ceramsite refers to a particle size range of 2.5-10 mm.

[0039] The preparation method of the above-mentioned lightweight thermal insulation high-strength concrete is:

[0040] (1...

Embodiment 2

[0050] Basically the same as Example 1, the difference is that 285kg of cement, 180kg of ceramsite, 100kg of Class I fly ash, 420kg of cinder ash, 6.3kg of water reducing agent, foaming agent accounted for 7% of the cement mass, 0.8kg of glass fiber, 0.9 kg of carbon fibers grafted with carbon nanotubes, and 160 kg of water. The water-cement ratio is 0.56, the ceramsite is pre-wet and broken ceramsite of about 5mm, the length of glass fiber is 30mm, and the length of carbon fiber grafted with carbon nanotubes is 3mm.

[0051] In the preparation method: in step (2), dry mix at low speed for about 20 seconds, so that each component material is evenly dispersed, and then add water, water reducing agent, foaming agent and mix wet at high speed for about 30 seconds;

[0052] In step (3), first use a high-frequency vibrating rod to vibrate for compaction for 25 s, and then use a vibrating table to vibrate for 25 s.

Embodiment 3

[0054] Basically the same as Example 1, the difference is that 300kg of cement, 220kg of ceramsite, 110kg of Class I fly ash, 480kg of cinder ash, 7kg of water reducer, foaming agent accounts for 9% of the cement mass, and 0.9kg of glass fiber. 1.2kg of carbon fiber grafted with carbon nanotubes, 110kg of water, water-cement ratio of 0.36, ceramsite is pre-wet broken ceramsite of about 10mm, length of glass fiber is 25mm, and carbon fiber length of grafted carbon nanotubes is 6mm.

[0055] In the preparation method: in step (2), dry mix at low speed for about 30 seconds, so that each component material is evenly dispersed, and then add water, water reducing agent, foaming agent and mix wet at high speed for about 40 seconds;

[0056] In step (3), first use a high-frequency vibrating rod to vibrate for compaction for 30 s, and then use a vibrating table to vibrate for 30 s.

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Abstract

The invention discloses lightweight thermal-insulation high-strength concrete and a preparation method thereof. The concrete is prepared from the following components in parts by mass: 270 to 300 parts of cement, 130 to 220 parts of ceramsite composite microspheres, 85 to 110 parts of fly ash, 360 to 480 parts of coal cinder ash, 5.5 to 7 parts of a water reducing agent, 0.7 to 0.9 part of glass fibers, 110 to 160 parts of water, 0.7 to 1.2 parts of carbon nanotubes grafted carbon fibers and 5 to 9 parts of a foaming agent. The preparation method comprises the following steps: firstly, crushing the large ceramsite for later use, and then preparing materials, feeding, pouring, vibrating, demolding and curing. The concrete is low in cost, energy-saving and environment-friendly, and still has relatively high mechanical properties and durability.

Description

technical field [0001] The invention relates to a concrete and a preparation method thereof, in particular to a lightweight heat-preserving high-strength concrete and a preparation method thereof. Background technique [0002] Concrete is the most commonly used civil engineering material in the field of construction engineering today. It is widely used because of its low price, simple preparation process and high compressive strength. However, after the general concrete is hardened and dried, a large number of tiny pores are easy to form on the surface and inside, and when the temperature is low, a large number of tiny cracks are formed during the use of concrete, and various factors lead to serious problems in the strength, impermeability and durability of concrete. Therefore, the service life is limited, making it unable to meet the requirements of various construction projects for the use of concrete materials, which limits its practical application. Traditionally, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02C04B18/10C04B18/08C04B14/42C04B14/38C04B38/02C04B38/10B28C5/40B28B1/52B28B1/08C04B111/20C04B111/40C04B111/76
CPCC04B28/04C04B20/023C04B14/386C04B14/42C04B18/08C04B18/10C04B38/02C04B38/10B28C5/402B28B1/52B28B1/08C04B2111/40C04B2111/20C04B2111/76Y02W30/91
Inventor 刘小艳余瑾瑶李田雨揭汉铎江波刘彦琦刘力李世杰姜可伟左俊卿夏苏鲁
Owner HOHAI UNIV
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