Low slump loss modified naphthalene series water-reducing agent and preparation method thereof

A naphthalene-based water reducer and slump loss technology, which is applied in the field of concrete water reducer and its preparation, can solve the problems of large slump loss over time and difficult construction, so as to ensure the water reducing effect, good effect, The effect of increasing strength

Inactive Publication Date: 2010-06-30
SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slump of the concrete mixture loses a lot over time (the slump mainly refers to the plasticizing performance and pumpability of the concrete), which makes construction difficult (the fluidity of the naphthalene-based water reducer is almost 0 after 2 hours ), and with the further improvement of high-performance concrete on the water-reducing performance, dispersion performance and slump retention performance of high-efficiency water-reducing agents, people have modified and compounded naphthalene-based water-reducers, More and more attention has been paid to the research on polycarboxylic acid-based high-efficiency water-reducing agents.

Method used

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  • Low slump loss modified naphthalene series water-reducing agent and preparation method thereof
  • Low slump loss modified naphthalene series water-reducing agent and preparation method thereof
  • Low slump loss modified naphthalene series water-reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A modified naphthalene-based water reducer with low slump loss, which is composed of 19 parts by weight of naphthalene-based water reducer and 1 part by weight of oxidized-etherified starch, represented by sample 1.

[0029] The determination method of cement slurry setting time is in accordance with GB / T 1346-2001. The method for measuring the fluidity of cement paste is in accordance with GB8077-2000. When measuring the mortar strength, the mortar-sand ratio is 1:2, and the water-cement ratio is w / c=0.325.

[0030] The modified naphthalene-based water reducer (sample 1) of this embodiment is used in concrete, and the dosage of the modified naphthalene-based water-reducer is 0.6% of the cement weight and remains unchanged; For comparison, its performance indicators are shown in Table 1:

[0031] Table 1 Comparison between sample 1 and naphthalene-based water reducer

[0032]

[0033] Note: The formula for calculating the change in fluidity is: (fluidity over time...

Embodiment 2

[0037] A modified naphthalene-based water reducer with low slump loss is composed of 23 parts by weight of naphthalene-based water reducer and 2 parts by weight of oxidized-etherified starch, represented by sample 2.

[0038] The modified naphthalene-based water reducer (sample 2) of this example is used in concrete, and the dosage of the modified naphthalene-based water-reducer is 0.6% of the cement weight and remains unchanged; For comparison, its performance indicators are shown in Table 2:

[0039] Table 2 Comparison between sample 2 and naphthalene-based water reducer

[0040]

[0041] It can be seen from Table 2 that increasing the amount of modified starch can further improve the fluidity of cement, and the strength after 3 days is also increasing.

Embodiment 3

[0043] A modified naphthalene-based water reducer with low slump loss, which is composed of 87 parts by weight of naphthalene-based water reducer and 13 parts by weight of oxidized-etherified starch, represented by sample 3.

[0044] The modified naphthalene-based water reducer (sample 3) of this embodiment is used in concrete, and the dosage of the modified naphthalene-based water-reducer is 0.6% of the cement weight and remains unchanged; For comparison, its performance indicators are shown in Table 3:

[0045] Table 3 Comparison between sample 3 and naphthalene-based water reducer

[0046]

[0047] It can be seen from Table 3 that when the amount of modified starch superplasticizer reaches a certain level, the change of cement fluidity with time increases first and then decreases, which is more conducive to the long-term mixing and transportation of concrete, and after 2 hours, The loss of fluidity is small. Moreover, the strength of cement added with the modified naph...

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Abstract

The invention discloses a low slump loss modified naphthalene series water-reducing agent which is characterized in that: the water-reducing agent is formed by mixing 87-97 percent of naphthalene series water-reducing agents and 3-13 percent of oxidation-etherification starch by weight percentage; by adopting the invention, the water-reducing agent contains a great amount of hydroxyl, cement hydration can be prevented, so as to lead the cement hydration products to be uniform and improve the slump-blocking performance of the water-reducing agent; the water-reducing agent in the invention is applied to the cement, the reducing amount of the mobility is more than 6 percent after two hours, 28d intensity is improved by more than 12 percent, therefore, the invention not only can ensure the water-reducing effect and reduce the slump economic loss, but also can effectively improve the cement and concrete intensity.

Description

technical field [0001] The invention belongs to a concrete water reducer and a preparation method thereof, and relates to a modified naphthalene-based water reducer with low slump loss and a preparation method thereof. Background technique [0002] In the prior art, cement concrete is mainly composed of cement, sand, stone, and water. In order to facilitate construction, the amount of water added is related to the workability and fluidity of concrete, which in turn affects the strength and durability of concrete. . Water-reducing agent is an admixture with water-reducing effect, which can significantly improve the workability and fluidity of concrete, and improve the strength and durability of concrete; it can greatly improve the performance of concrete without increasing the unit water consumption. Workability and fluidity; or under the condition that the concrete slump is basically the same and does not affect the workability, reduce the unit water consumption of concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/30
CPCC04B2103/0094C04B2103/308C04B2103/302C04B24/383C04B40/0039C04B24/38C04B20/023C04B24/226
Inventor 严云赵平胡志华
Owner SICHUAN HUASHI GREEN HOMELAND BUILDING MATERIALS
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