High-strength self-compacting concrete and preparation method thereof

A self-compacting concrete and high-strength technology, which is applied in the field of concrete, can solve problems such as concrete cracking, and achieve the effects of less cracking, better overall quality, and improved compactness

Inactive Publication Date: 2020-07-14

上海兆捷实业发展有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] In the above application documents, by controlling the proportion of river sand, fly ash, silica fume, slag powder and quartz powder, and by controlling the particle size of river sand, the strength of high-strength concrete can more easily meet the requirements of high-strength engineering construction. However, when concrete is used in areas with high sulfate ion cont...

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Method used

Test result: the test result of test sample 1-17 and control sample 1-6 is as shown in table 2. As can be seen from Table 2, it can be seen from the comparison of the test results of test samples 1-5 and control samples 1-3 that magnesium fluorosilicate and fly ash can play a good compound synergistic effect, which can greatly improve the high-strength Sulfate attack resistance of self-compacting concrete. Comparing the test results of test samples 12-14 and test sample 1, it can be concluded that the addition of a functional mixture obtained by mixing silica, alumina and magnesia in any proportion can improve the sulfate attack resistance of high-strength self-compacting concrete performance, and fur...

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Abstract

The invention discloses high-strength self-compacting concrete and a preparation method thereof, relates to the technical field of concrete, and solves the problem that the whole concrete is cracked due to the fact that sulfate ions easily erode the concrete, and the high-strength self-compacting concrete comprises the following components in parts by weight: 420-460 parts of a cement raw material; 58 to 62 parts of mineral powder; 50 to 60 parts of fly ash; 850 to 860 parts of medium sand; 850-860 parts of a crushed stone raw material; 9-11 parts of a water reducing agent; 140 to 145 parts ofwater; 3-6 parts of magnesium fluosilicate; and 12-18 parts of a filling reinforcing material. The high-strength self-compacting concrete provided by the invention has good and stable sulfate ion corrosion resistance, and is not easy to crack as a whole when being applied to regions with higher sulfate ion content.

Technology Topic

ChemistryMining engineering +6

Image

Examples

Experimental program(16)
Comparison scheme(6)
Effect test(1)

Example Embodiment

[0042] Example 1: A high-strength self-compacting concrete. The components and their corresponding parts by weight are shown in Table 1, and are prepared by the following steps:

[0043] Step 1: Stir and mix the corresponding parts by weight of medium sand, crushed stone raw materials, fly ash, cement raw materials, mineral powder and quartz powder at a stirring speed of 40 rpm and a stirring time of 25 minutes to obtain a mixture;

[0044] Step 2: Mix the water reducing agent and water in a mixing station, and continue to stir at a stirring speed of 15 rpm, stirring for 4 minutes, to obtain a mixed solution;

[0045] Step 3: Stir and mix the mixture with the mixture, continue stirring for 8 minutes at a stirring speed of 35 rpm, add the corresponding parts by weight of magnesium fluorosilicate, and continue stirring for 4 minutes to obtain high-strength self-compacting concrete.

[0046] Note: In the above steps, the raw materials of crushed stone should be selected with two grades: 5-10mm, 10-20mm, the maximum particle size is 40mm, and the gradation ratio is 1:1.5; the cement raw material is Portland cement P.Ⅱ52.5 grade; The water agent uses polycarboxylic acid series high-performance water-reducing agent, and the polycarboxylic acid series high-performance water-reducing agent is PC-1022 polyether polycarboxylic acid water-reducing agent purchased from Suzhou Xingbang Chemical Building Materials Co., Ltd.

Example Embodiment

[0047] Example 2: A high-strength self-compacting concrete, which is different from Example 1 in that it is prepared through the following steps:

[0048] Step 1: Stir and mix the corresponding parts by weight of medium sand, gravel raw materials, fly ash, cement raw materials, mineral powder and quartz powder at a stirring speed of 30 rpm and a stirring time of 30 minutes to obtain a mixture;

[0049] Step 2: Mix the water reducing agent and water in a mixing station, and continue to stir at a stirring speed of 10 rpm and stir for 5 minutes to obtain a mixed solution;

[0050] Step 3: Stir and mix the mixture with the mixture, continue stirring for 10 minutes at a stirring speed of 30 rpm, add the corresponding parts by weight of magnesium fluorosilicate, and continue stirring for 5 minutes to obtain high-strength self-compacting concrete.

Example Embodiment

[0051] Example 3: A high-strength self-compacting concrete, which is different from Example 1 in that it is prepared through the following steps:

[0052] Step 1: Stir and mix the corresponding parts by weight of medium sand, gravel raw materials, fly ash, cement raw materials, mineral powder and quartz powder at a stirring speed of 50 rpm and a stirring time of 20 minutes to obtain a mixture;

[0053] Step 2: Mix the water reducing agent and water in a mixing station, and continue to stir at a stirring speed of 20 rpm for 3 minutes to obtain a mixed solution;

[0054] Step 3: Stir and mix the mixture with the mixture, continue stirring for 6 minutes at a stirring speed of 40 rpm, add the corresponding parts by weight of magnesium fluorosilicate, and continue stirring for 3 minutes to obtain high-strength self-compacting concrete.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve compactness
Not easy to crack

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Corrosion Magnesium Water reducer Crushed stone

High-strength self-compacting concrete and preparation method thereof

A self-compacting concrete and high-strength technology, which is applied in the field of concrete, can solve problems such as concrete cracking, and achieve the effects of less cracking, better overall quality, and improved compactness

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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