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Steel fiber reinforced internal curing high-strength silicate ceramsite and preparation method thereof

A technology of steel fiber and silicate, which is applied in the field of high-strength silicate ceramsite and its preparation, can solve the problems of large drying shrinkage of high-strength concrete, restrictions on the development and promotion of high-strength lightweight concrete, and low water absorption, so as to reduce CO2 emissions , good strain coordination performance, and the effect of suppressing cracks

Active Publication Date: 2018-05-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the production of ceramsite in my country is basically based on high-temperature sintering technology. The surface of ceramsite is vitrified and has fewer capillary pores, so the water absorption rate is low, which is 2% to 8%. The effect is not obvious. In a dry construction environment, due to the accelerated evaporation rate of water, the internal curing effect is seriously affected; if the internal curing effect is improved, the water absorption rate of the aggregate should be increased, so as to increase the pre-storage water of the aggregate and inhibit the early cracking of the concrete ability
[0005] my country's ceramsite system is single and light-weight ceramsite is produced intensively. The development of high-strength ceramsite for structures is slow, accounting for only 2% to 3% of the ceramsite market, which limits the development and promotion of high-strength light concrete in my country; If the problem of drying shrinkage is not solved, the utilization of high-strength lightweight concrete will still be limited
[0006] At this stage, my country's light aggregate industry is facing three problems: first, the crushing index of light aggregate is low, and the production energy consumption is relatively large; second, the elastic modulus of light aggregate is low, resulting in greater creep of light concrete than ordinary concrete , restricting the application of light concrete in prestressed concrete; third, the pre-storage capacity of sintered light aggregate as an internal curing water carrier is low, and the water absorption rate is 2% to 8%, which cannot effectively inhibit the self-drying phenomenon of high-grade concrete

Method used

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  • Steel fiber reinforced internal curing high-strength silicate ceramsite and preparation method thereof
  • Steel fiber reinforced internal curing high-strength silicate ceramsite and preparation method thereof
  • Steel fiber reinforced internal curing high-strength silicate ceramsite and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] combine figure 2 , in this embodiment, the quicklime A-CaO is 70%, and the steel fiber volume ratio is 0.5%; quicklime: fly ash: diatomaceous earth: yellow sand=25.5:39.5:20:15; the cylinder compressive strength of the prepared ceramsite is 12MPa~16MPa, 1h water absorption rate is 15%~22%;

[0046] Step 1: Put 152.9kg of quicklime and 237.1kg of fly ash into the forced mixer, spray 15.3kg of water (the water quality accounts for 10% of the quicklime mass) while stirring, and unload when the materials are mixed evenly and appear wet Digest for 3 hours in the digestion bin, and make digested material for later use;

[0047] The second step: Put the digested material prepared in the first step into the wheel mill and grind it for 3min to 5min. After there are no obvious agglomerated particles, add it to the forced mixer together with 90kg of yellow sand and spray 50.7kg of water at the same time (the water quality accounts for the digestion 13% of the material quality) ...

Embodiment 2

[0053] combine figure 2 , in this embodiment, the quicklime A-CaO is 75%, and the steel fiber volume ratio is 1.5%; quicklime: fly ash: diatomaceous earth: yellow sand=25.6:36.4:25:13; the cylinder compressive strength of the prepared ceramsite is 18MPa~22MPa, 1h water absorption rate is 23%~25%;

[0054] Step 1: Put 153.6kg of quicklime and 218.4kg of fly ash into the forced mixer, spray 15.4kg of water while stirring (the water quality accounts for 10% of the quicklime mass), and when the materials are mixed evenly and appear wet, unload Digest in the digestion chamber for 4 hours, and make digested material for later use;

[0055] Step 2: Put the digested material prepared in the first step into the wheel mill and grind it for 3-5 minutes. After there are no obvious agglomerated particles, add it to the forced mixer together with 78kg of yellow sand and spray 55.8kg of water at the same time (the water quality accounts for the digestion 15% of the material quality) and s...

Embodiment 3

[0061] combine figure 2 , in this embodiment, the quicklime A-CaO is 80%, and the steel fiber volume ratio is 1.5%; quicklime: fly ash: diatomaceous earth: yellow sand=25.9:34.1:30:10; the cylinder compressive strength of the prepared ceramsite is 18MPa~22MPa, 1h water absorption 26%~30%;

[0062] Step 1: Put 155.2kg of quicklime and 204.8kg of fly ash into a forced mixer, and spray 23.3kg of water (the water quality accounts for 15% of the quicklime mass) while stirring. When the materials are mixed evenly and appear wet, unload Digest in the digestion chamber for 4 hours, and make digested material for later use;

[0063] Step 2: Put the digested material prepared in the first step into the wheel mill and grind for 3-5 minutes. After there are no obvious agglomerated particles, add it to the forced mixer together with 60kg of yellow sand and spray 54kg of water at the same time (the water quality accounts for the digested material. mass 15%) and stir for 3min to 4min. Whe...

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Abstract

The invention discloses steel fiber reinforced internal curing high-strength silicate ceramsite and a preparation method thereof. Raw materials of the ceramsite are composed of dried material powder and steel fibers, wherein the doping amount of the steel fibers accounts for 0.5-3.0% of the volume of the dried material powder; the dried material powder comprises the following components in percentage by mass: 12-40% of fly ash, 25-28% of quick lime, 20-50% of diatomite and 10-15% of yellow sand. The preparation method comprises the following steps: performing wet balling, naturally curing, andperforming hydrothermal synthesis, thereby obtaining the steel fiber reinforced internal curing high-strength silicate ceramsite. The prepared ceramsite has cylinder compressive strength of 12-28MPa,a water absorption rate of 15-30% within an hour and obviously improved elasticity modulus, and can be used for preparing light concrete of an LC45-80 structure. The steel fiber reinforced internal curing high-strength silicate ceramsite disclosed by the invention has the advantages of simplifying the process and saving the equipment, energy and raw materials, the internal curing effect of lightweight aggregate on concrete can be effectively improved, and the problems that the conventional lightweight aggregate is low in cylinder compressive strength and high-grade lightweight aggregate concrete is difficultly prepared are well solved.

Description

technical field [0001] The invention relates to a high-strength silicate ceramsite that is toughened by steel fibers and has a significant internal maintenance effect on mortar substrates and a preparation method thereof, belonging to the field of artificial light coarse aggregate production for structural light concrete. technical background [0002] my country's research on lightweight concrete, especially lightweight aggregates, started relatively late. The traditional production process uses clay, shale, etc. as raw materials, and is sintered at a high temperature of 1100 ° C to 1250 ° C in a rotary kiln. As the country further promotes the innovation of wall materials, and under the guidance of policies such as implementing the basic national policy of saving resources and protecting the environment, effectively protecting cultivated land and the environment, saving resources, and improving resource utilization efficiency, clay ceramsite will gradually withdraw from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B28/18
CPCC04B28/18C04B2111/40C04B2201/20C04B2201/50C04B14/06C04B14/08C04B14/48C04B38/0067C04B38/0025
Inventor 唐国强崔崇丁锡锋张士华顾敏佳孙亮马海龙
Owner NANJING UNIV OF SCI & TECH
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