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Manufacturing method for high pumping concrete

A manufacturing method and concrete technology, applied in the field of engineering and building materials, can solve the problems of difficult pumping construction, high cost, high viscosity, etc., and achieve the effects of saving energy and resources, low manufacturing cost, and high compactness

Inactive Publication Date: 2013-01-30
冯乃谦 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when some polycarboxylate high-efficiency water-reducers are added in an amount ≥ 0.6% (solid content), the concrete will not solidify within 4 days, which will cause serious engineering accidents. Naphthalene-based high-efficiency water-reducers are used to prepare For C60 concrete, due to the high viscosity, pumping construction is very difficult
When using sulfamate high-efficiency water reducer to prepare high-performance concrete above C60, if the dosage is slightly higher, it will cause bleeding and bottoming, and pumping construction will not be possible.
Therefore, polycarboxylate high-efficiency water reducers are used to prepare ultra-high performance concrete above C100 at home and abroad, but the cost is high, and hanging blue is generally used for construction

Method used

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  • Manufacturing method for high pumping concrete
  • Manufacturing method for high pumping concrete
  • Manufacturing method for high pumping concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Weigh concrete raw materials according to the following mass percentages:

[0054] Portland cement 23

[0055] Superfine powder 11

[0056] River sand or washed sea sand 28

[0057] Gravel 32

[0058] water 5

[0059] Water reducer 1;

[0060] (2) Pour the weighed Portland cement and superfine powder into the mixer, and stir for 40 seconds; add the weighed river sand or washed sea sand, and stir for 40 seconds; pour in the weighed water and water reducing agent, After stirring for 50 seconds, pour the weighed crushed stone, and after stirring for 70 seconds, concrete is obtained.

[0061] The concrete manufactured in the above-mentioned Example 1 was divided into two parts, one part was sealed and stored indoors, and the other part was sealed and stored under sunlight at 35°C. After 1 hour, 2 hours, and 3 hours, the slump, expansion, and Rewinding time and pressure bleeding volume, the results are as follows:

[0062]

[0063] After 3 hours, the plastic re...

Embodiment 2

[0068] (1) Weigh concrete raw materials according to the following mass percentages:

[0069] Portland cement 24

[0070] Superfine powder 10

[0071] River sand or washed sea sand 27

[0072] Gravel 33

[0073] water 4.8

[0074] Water reducer 1.2;

[0075] (2) Pour the weighed Portland cement and superfine powder into the mixer, and stir for 40 seconds; add the weighed river sand or washed sea sand, and stir for 40 seconds; pour in the weighed water and water reducing agent, After stirring for 50 seconds, pour the weighed crushed stone, and after stirring for 70 seconds, concrete is obtained.

[0076] The ultra-high-performance concrete manufactured in Example 2 was compared with the concrete formulated with polycarboxylate superplasticizer. The performance of concrete is shown in Table-1, and the strength of concrete is shown in Table-2. No. 1 is the concrete prepared by polycarboxylate superplasticizer, in which the solid content of polycarboxylate superplasticizer i...

Embodiment 3

[0084] (1) Weigh concrete raw materials according to the following mass percentages:

[0085] Portland cement 23

[0086] Micro powder 9

[0087] River sand or washed sea sand 28

[0088] Gravel 34

[0089] water 4.5

[0090] Water reducer 1.5;

[0091] (2) Pour the weighed Portland cement and superfine powder into the mixer, and stir for 60 seconds; add the weighed river sand or washed sea sand, and stir for 50 seconds; pour in the weighed water and water reducer, After stirring for 70 seconds, pour the weighed crushed stone, and after stirring for 80 seconds, concrete is obtained.

[0092] In each of the above-mentioned embodiments, the preparation method of the water reducing agent used is as follows:

[0093] The water reducer is composed of A component and B component, the mass ratio of A component and B component is: A component: B component = 1: 1.5, where:

[0094] The mass percent of each raw material in A component is:

[0095] Naphthalene superplasticizer 45...

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Abstract

The invention relates to a manufacturing method for high pumping concrete, and belongs to the technical field of engineering construction materials. The manufacturing method comprises the following steps of: weighing silicate cement, ultrafine powder, river sand or washed sea sand, gravel, water and a water reducer according to a proportion, pouring the weighed silicate cement and ultrafine powder into a stirrer, and stirring; adding the weighed river sand or washed sea sand, and stirring; pouring the weighed water and water reducer, and stirring; and pouring the weighed gravel, and stirring to obtain the concrete. The concrete manufactured by the method can retain plasticity for a long time, so that slump, expansion and rewinding time are basically invariable for 3 to 4 hours, and bleeding is prevented; therefore, the requirements of an ultrahigh pumping technology are met.

Description

technical field [0001] The invention relates to a method for manufacturing high-pumpable concrete, which belongs to the technical field of engineering building materials. Background technique [0002] At present, the ultra-high-performance concrete with a strength ≥ 140MPa produced abroad is constructed with hanging blue, and is prepared with polycarboxylate superplasticizer. The concrete is expensive to manufacture and has a high viscosity, making pumping difficult. For example, Guangzhou West Tower Engineering Project Department pumped C100 ultra-high performance concrete, which was also prepared with polycarboxylate superplasticizer. However, due to the low water-binder ratio of ultra-high-performance concrete, more superplasticizers are often added to reduce the viscosity of the concrete and improve fluidity and pumpability. However, when some polycarboxylate high-efficiency water-reducers are added in an amount ≥ 0.6% (solid content), the concrete will not solidify wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/02
Inventor 冯乃谦叶浩文
Owner 冯乃谦
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