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Underwater concrete containing limestone machine-made sand and preparation method thereof

A technology of underwater concrete and machine-made sand, which is applied in the field of building materials, can solve problems such as increased difficulty in concrete quality control, increased concrete quality fluctuation factors, unsatisfactory fluidity and cohesion, etc., to achieve fluidity and cohesion Not ideal, good for environmental protection, good fluidity

Active Publication Date: 2014-07-23
GUANGXI YUFENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of pebble machine-made sand to configure underwater concrete has unsatisfactory fluidity and cohesion, and it is easy to cause adverse consequences such as pipe plugging and floating cages during construction. In order to meet good underwater construction requirements, natural sand is bound to be used. It will definitely lead to an increase in the cost of fine aggregate, a sharp drop in profits, an increase in the fluctuation factors affecting the quality of concrete, and an increase in the difficulty of concrete quality control

Method used

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  • Underwater concrete containing limestone machine-made sand and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Prepare the above-mentioned limestone-containing machine-made sand underwater concrete 1m 3 , Weigh the raw materials according to the following parts by weight: cement 200kg, mineral powder 60kg, crushed stone 980kg, limestone machine-made sand 950kg, water 165kg, water reducing agent 8.4kg, fly ash 55kg;

[0026] (2) Pour the weighed raw materials into the mixer and stir for 50 seconds.

[0027] Among them, the cement strength is 42.5Mpa, the ore powder is granulated water-quenched blast furnace slag powder, the grade is S75, the crushed stone particle size is 5-31.5mm continuous gradation, and the particle size of limestone machine-made sand is in the range of 75um-5mm Continuous gradation, the fineness modulus distribution is between 2.6 and 3.2, the gradation is in zone 2, the water reducing agent is polycarboxylate high-efficiency water reducing agent, the water reducing rate is 20%, and the fly ash grade is Ⅱ.

[0028] The obtained concrete has a slump of 21...

Embodiment 2

[0030] (1) Prepare the above-mentioned limestone-containing machine-made sand underwater concrete 1m 3 , Weigh the raw materials according to the following parts by weight: cement 210kg, mineral powder 60kg, crushed stone 1000kg, limestone machine-made sand 930kg, water 160kg, water reducing agent 9.0kg, fly ash 55kg;

[0031] (2) Pour the weighed raw materials into the mixer and stir for 50 seconds.

[0032] Among them, the cement strength is 42.5Mpa, the ore powder is granulated water-quenched blast furnace slag powder, the grade is S75, the crushed stone particle size is 5-31.5mm continuous gradation, and the particle size of limestone machine-made sand is in the range of 75um-5mm Continuous gradation, the fineness modulus distribution is between 2.6 and 3.2, the gradation is in zone 2, the water reducing agent is polycarboxylate high-efficiency water reducing agent, the water reducing rate is 20%, and the fly ash grade is Ⅱ.

[0033] The resulting concrete has a slump of ...

Embodiment 3

[0035] (1) Prepare the above-mentioned limestone-containing machine-made sand underwater concrete 1m 3 , Weigh the raw materials according to the following parts by weight: cement 240kg, mineral powder 60kg, crushed stone 1000kg, limestone machine-made sand 900kg, water 160kg, water reducing agent 9.2kg, fly ash 60kg and mix.

[0036] (2) Pour the weighed raw materials into the mixer and stir for 50 seconds.

[0037] Among them, the cement strength is 42.5Mpa, the ore powder is granulated water-quenched blast furnace slag powder, the grade is S75, the crushed stone particle size is 5-31.5mm continuous gradation, and the particle size of limestone machine-made sand is in the range of 75um-5mm Continuous gradation, the fineness modulus distribution is between 2.6 and 3.2, the gradation is in zone 2, the water reducing agent is polycarboxylate high-efficiency water reducing agent, the water reducing rate is 20%, and the fly ash grade is Ⅱ.

[0038] The obtained concrete has a sl...

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Abstract

The invention relates to an underwater concrete containing limestone machine-made sand and a preparation method thereof, and belongs to the field of construction materials. The concrete comprises the following raw materials in parts by weight: 5 to 20 parts of cement, 1 to 7 parts of mineral powder, 0 to 5 parts of coat ash, 35 to 45 parts of broken stone, 30 to 40 parts of machine-made sand, 5 to 8 parts of water, and 0.1 to 0.8 part of water reducer; wherein the machine-made sand is limestone machine-made sand. The concrete has the advantages of good cohesiveness, fluidity, and water retaining performance, high strength, good durability, simple production technology, low cost, and good economic and social profits.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a special concrete used in underwater conditions, in particular to an underwater concrete containing limestone machine-made sand. Background technique [0002] Underwater concrete is a special concrete used in construction under underwater conditions, which needs to be solidified and hardened in a special environment. In order to ensure that the concrete has sufficient strength and good working performance, so that it can withstand various external forces and different factors of the upper structure, the cohesion, fluidity, water retention, strength and durability of underwater concrete are required to be higher. Therefore, there are strict requirements on the technical indicators and dosage of various materials used in underwater concrete. [0003] Sand is the main material of concrete, such as patent: 201310519662.5, a high-damping self-compacting concrete, the invention disclo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B18/12C04B14/02
CPCY02W30/91
Inventor 周珉李青川黄崇弈梁海区
Owner GUANGXI YUFENG GRP
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