High-performance machine-made sand marine concrete and preparation method thereof

A high-performance concrete technology, applied in the field of building materials, can solve the problems that affect the strength and durability of concrete, threaten the safety of infrastructure facilities, and the particle gradation is not as good as river sand, so as to achieve stable and controllable quality and meet the design technology Requirements, the effect of good quality concrete structure

Active Publication Date: 2013-09-11
宁波市高等级公路建设指挥部 +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, the marine concrete in the marine environment or coastal environment mainly uses river sand for concrete preparation, but there are many problems, such as: the quality of river sand is unstable, resources are increasingly scarce, prices are rising, and supply is not timely, which easily affects the construction period. Increase the cost of the project; due to the shortage of river sand, some unscrupulous traders sell sea sand as river sand, which directly leads to a decline in the quality of the construction project and fails to meet the design service life requirements, causing major quality hidden dangers, seriously affecting and threatening the country. The safety of basic building facilities; and the large-scale

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  • High-performance machine-made sand marine concrete and preparation method thereof
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  • High-performance machine-made sand marine concrete and preparation method thereof

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preparation example Construction

[0029] The preparation method of high-performance machine-made sand marine concrete comprises the following steps:

[0030] 1) According to the weight ratio of raw material components, weigh Portland cement, fly ash, mineral powder, machine-made sand, crushed stone, polycarboxylate superplasticizer and water in corresponding parts by weight, and set aside. The raw materials are equipped as follows:

[0031] Portland cement is P.Ⅱ type Portland cement produced by Hubei Yadong Cement Co., Ltd., with a strength grade of 42.5 and a specific surface area of ​​385 m 2 / kg, water requirement for standard thickening is 27.4%, initial setting time is 136min, final setting time is 195min, 3d compressive strength and flexural strength are 31.0MPa and 5.3MPa, 28d compressive strength and flexural strength are 58.4MPa and 9.4 MPa;

[0032] The fly ash is Class II fly ash produced by Wuhan Yangluo Power Plant, with a fineness of 7.1% and a loss on ignition of 3.4%;

[0033] The mineral p...

Embodiment 1～3

[0044] Examples 1-3 are marine concrete prepared by the above-mentioned preparation method according to three different weight ratios, and a river sand concrete is added as a comparison example. The weight ratio of each raw material component is shown in Table 2:

[0045] Table 2

[0046]

[0047] Among them, the water reducing agent used in Example 1 is the LN type polycarboxylate water reducing agent produced by Wuhan Gangwan, and the water reducing rate is 35.6%; the water reducing agent used in Example 2 and Comparative Examples 1 to 3 is Haide The SP water reducing agent produced by Shun has a water reducing rate of 33.1%; the water reducing agent used in Example 3 is the PC water reducing agent produced by Jiangsu Aulite, and the water reducing rate is 32.6%.

[0048] The main performance parameters of the concrete that each embodiment and comparative examples make in table 2 are as shown in table 3:

[0049] table 3

[0050]

Embodiment 4

[0055] Using the above-mentioned preparation method of machine-made sand marine concrete, according to the weight ratio of raw material components, P.Ⅱ42.5 type Portland cement is 288kg, class II fly ash is 96kg, S95 grade mineral powder is 96kg, machine-made sand is 761kg, and crushed stone is 1009kg. , 3.36kg of water reducing agent and 148kg of mixing water to make machine-made sand marine concrete. Among them, the water reducer used in this example is the SP type polycarboxylate water reducer produced by Shanghai Deshun, and the water reducing rate is 33.1%; the machine-made sand used in this example is the II gradation zone produced by Ninghai Chuangli Machine-made sand, fineness modulus 2.9, stone powder content 8%, MB value 0.8.

[0056] According to the test, the machine-made sand marine concrete produced in this example has good workability, mechanics and durability, the slump reaches 185mm, the 4d compressive strength is 53.3MPa, and the 28d compressive strength is 6...

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Abstract

The invention discloses high-performance machine-made sand marine concrete and a preparation method thereof. The machine-made sand marine concrete comprises the following raw material components in parts by weight: 100 parts of portland cement, 10-50 parts of fly ash, 10-50 parts of mineral powder, 240-290 parts of machine-made sand, 320-370 parts of broken stone, 0.9-1.5 parts of a polycarboxylate water reducer, and 44-57 parts of water. The machine-made sand marine concrete disclosed by the invention has the characteristics of being convenient to construct, low in cost, good in working performance, high in early-stage and middle-later-stage mechanical property, excellent in durability, good in volume stability, and strong in pumpability, and is close to or even higher than river sand marine concrete in the aspects of concrete performance and technical indexes; and according to the machine-made sand marine concrete, the defects of shortage of river sand resources, instable quality, high price and the like are overcome, and the technical problems of machine-made sand in the fields of preparation and performance research for marine concrete are solved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-performance machine-made sand marine concrete and a preparation method thereof. Background technique [0002] With the continuous development of infrastructure projects such as large cross-sea bridges and subsea tunnels, marine concrete is widely used in infrastructure projects, which puts forward higher technical requirements for the performance of marine concrete than ordinary concrete. At present, the marine concrete in the marine environment or coastal environment mainly uses river sand for concrete preparation, but there are many problems, such as: the quality of river sand is unstable, resources are increasingly scarce, prices are rising, and supply is not timely, which easily affects the construction period. Increase the cost of the project; due to the shortage of river sand, some unscrupulous traders sell sea sand as river sand, which directly leads to a decline i...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/06
Inventor 刘慈军秦明强陈方东陈涛屠柳青徐文冰马芹纲占文
Owner 宁波市高等级公路建设指挥部
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