Concrete with low slump loss and preparation method thereof

A slump loss, concrete technology, applied in the field of concrete, can solve the problems of large concrete slump loss, long transportation and waiting time, unqualified building strength, etc., to enhance and compensate for poor shrinkage resistance. Effect

Inactive Publication Date: 2019-04-19
上海练定新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The slump loss of concrete is a problem often encountered in the use of commercial concrete. Due to the characteristics of commercial concrete production, its transportation and waiting time are long, and the time difference between mixing and pouring of fresh concrete is often as long as 2 hours or even longer. , which results in a loss of slump
Especially in the hot summer, the slump loss of conc

Method used

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  • Concrete with low slump loss and preparation method thereof
  • Concrete with low slump loss and preparation method thereof
  • Concrete with low slump loss and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: A kind of low slump loss concrete, each component and its corresponding parts by weight are as shown in Table 1, and are prepared through the following steps:

[0040] Step 1, preparation of water reducer: put methallyl polyoxyethylene ether with a molecular weight of 2400, diethyl maleate and water into the reaction kettle, mix well, stir, and then add horse Maleic anhydride, sodium methacryl sulfonate aqueous solution and 3% ammonium persulfate aqueous solution, the maleic anhydride is dripped within 3 hours, the sodium methacrylic sulfonate aqueous solution and ammonium persulfate aqueous solution are dripped within 3.5 hours, and after all the dripping After the addition is complete, keep it warm at 80°C for 1 hour, lower it to room temperature and adjust the pH to 5 with NaOH hot saturated solution to obtain the product;

[0041] Step 2, mixing and stirring the fly ash, river sand and gravel evenly to obtain a mixture;

[0042] Step 3, mixing and sti...

Embodiment 2-6

[0045] Example 2-6: a low slump loss concrete, the difference from Example 1 is that each component and its corresponding parts by weight are shown in Table 1.

[0046] Each component and parts by weight thereof in table 1 embodiment 1-6

[0047]

Embodiment 7

[0048] Embodiment 7: a kind of preparation method of low slump loss concrete, the difference with embodiment 1 is:

[0049] Step 1, preparation of water reducer: put methallyl polyoxyethylene ether with a molecular weight of 2800, diethyl maleate and water into the reaction kettle, mix well, stir, and then add horse Maleic anhydride, methacrylic sodium sulfonate aqueous solution and 3% ammonium persulfate aqueous solution, the maleic anhydride is dripped within 3.5h, the methacrylic sodium sulfonate aqueous solution and the ammonium persulfate aqueous solution are dripped within 4h, wait until they are all dripped After the addition is complete, keep it warm at 80°C for 1 hour, lower it to room temperature and adjust the pH to 5 with NaOH hot saturated solution to obtain the product;

[0050] It is all identical with embodiment one.

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Abstract

The invention discloses a concrete with low slump loss and a preparation method thereof, and relates to the technical field of concrete. The concrete comprises following components in parts by weight:240 to 420 parts of cement, 70 to 100 parts of fly ash, 900 to 1000 parts of river sand, 950 to 1100 parts of broken stone, 190 to 210 parts of water, 5 to 10 parts of water reducer, and 1.8 to 2.2 parts of combined fiber. The water reducer is prepared by the following steps: adding methyl allyl polyoxyethylene ether, diethyl maleate, and water into a reactor, evenly mixing, stirring, then simultaneously dropwise adding maleic anhydride, a water solution of sodium methyl allyl sulfonate, and a water solution of ammonium persulfate, after dropwise addition, keeping the temperature for one hour, cooling to the room temperature, and adjusting the pH value to 5-7 by a hot NaOH saturated solution. The concrete has good dispersibility and fluidity after the modified water reducer is added, andthe concrete quality is largely improved.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, it relates to a low slump loss concrete and a preparation method thereof. Background technique [0002] Slump loss, that is, the phenomenon that the concrete mixture gradually thickens after a certain period of time, and the cohesion increases and the fluidity decreases. [0003] The slump loss of concrete is a problem often encountered in the use of commercial concrete. Due to the characteristics of commercial concrete production, its transportation and waiting time are long, and the time difference between mixing and pouring of fresh concrete is often as long as 2 hours or even longer. , which results in a loss of slump. Especially in the hot summer, the slump loss of concrete is too large, which makes it difficult to pump or densely convey concrete during on-site pouring, thereby affecting construction efficiency. In addition, in order to solve the problem of poor concret...

Claims

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Application Information

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IPC IPC(8): C04B28/00C08F283/06C08F222/14C08F222/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B28/00C04B2103/302C04B2201/50C08F283/065C04B18/08C04B14/068C04B18/12C04B16/0633C04B14/42C08F222/14C08F222/06C08F228/02
Inventor 胡建修
Owner 上海练定新材料科技有限公司
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