Expanding agent for fixing traffic detection device wall and preparation method of expanding agent

A traffic detection and expansion agent technology, which is applied in the field of traffic detection equipment wall fixed expansion agent and its preparation, can solve the problems that the expansion rate of the expansion agent is too large, and the expansion performance of the expansion agent cannot be satisfied, so as to improve the expansion energy and stabilize the The effect of installing testing equipment and reducing costs

Active Publication Date: 2019-06-07
常熟京常智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation process of high-performance shrinkage-compensating concrete expansion agents (such as HCSA, Japan CSA, etc.) in the prior art usually requires a high-temperature environment (between 1200-1600 ° C), and the poor expansion performance of traditional expansion agents cannot meet the requirements of modern high-performance concrete. The requirement of agent; The invention provides a kind of expansion agent that comprises the high-performance shrinkage compensating concrete of modified hectorite, and the present invention adopts octa(aminophenyltrioxysilane) in organic solvent as silane modifier to hectorite The organosilicon-modified hectorite is prepared by reforming and modifying the stone structure, and then compounded with calcium oxide and carboxymethyl cellulose calcium to form a high-performance expansion agent for shrinkage-compensating concrete; the preparation process of the present invention does not require high-temperature calcination, and the prepared The expansion agent can limit the large expansion rate, and under the same technical requirements, the dosage can be reduced and the cost can be reduced

Method used

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  • Expanding agent for fixing traffic detection device wall and preparation method of expanding agent
  • Expanding agent for fixing traffic detection device wall and preparation method of expanding agent
  • Expanding agent for fixing traffic detection device wall and preparation method of expanding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] One, first prepare organosilicon modified hectorite according to the following steps:

[0033] 1) Place 10.0g of hectorite in an aqueous solution of sodium carbonate with a concentration of 2.0wt% to form a suspension, then raise the temperature to 40-70°C and stir for 2-3h, cool down to room temperature and let stand for aging for more than 8h before filtering, Dried to constant weight to obtain alkali-modified hectorite;

[0034] 2) Put 1.0g of alkali-modified hectorite in 50ml of tetrahydrofuran to disperse evenly, then add 1.0g of octa(aminophenyltrioxysilane) to reflux for 1-2 hours, then distill and remove the solvent tetrahydrofuran to obtain organosilicon-modified hectorite .

[0035] 2. Preparation of expansion agent for shrinkage-compensating concrete:

[0036] Raw materials of different parts by weight are used to prepare expansion agents for shrinkage-compensating concrete (organosilicon-modified hectorite, calcium oxide and calcium carboxymethyl cellulose...

Embodiment 2

[0046] In the present invention, carboxymethyl cellulose calcium is used as a binder to bond the expansion agent component calcium oxide and organosilicon-modified hectorite together, and the present invention attempts to prepare the two by stirring, coating and bonding For the multi-layer structure, the influence of the preparation method on the 7-day limit expansion rate in water of "Concrete Expansion Agent" GB23439-2009 is investigated:

[0047] Method A:

[0048] 1) Grinding the organosilicon-modified hectorite and calcium oxide respectively for later use, the particle diameters are 200-300 mesh;

[0049] 2) 75 parts by weight of organosilicon-modified hectorite after pulverization is impregnated into the dimethylacetamide solution of carboxymethylcellulose calcium (14 parts by weight of carboxymethylcellulose calcium, 130 parts by weight of dimethylacetamide ), heated and stirred at 60-90°C, and then cooled to room temperature to obtain a dispersion of organosilicon-mod...

Embodiment 3

[0059] The present invention has further studied the influence of calcium oxide and organosilicon modified hectorite particle size on the 7-day limit expansion rate in expansion agent water (expansion agent is all controlled at 400-600m by pulverization 2 / kg), that is, change the particle size of calcium oxide and organosilicon modified hectorite to investigate the expansion performance of the expansion agent; the preparation method is with reference to method A in Example 2, and the expansion agent results obtained by different particle sizes are as shown in table 2 :

[0060] Table 2 The influence of raw material particle size on the performance of expansion agent

[0061]

[0062]

[0063] The test results show that, 1) at first the particle size of calcium oxide should not be higher than the particle size of organosilicon modified hectorite (sequence 1-4), that is to say, the particle size mesh of calcium oxide is required to be larger than the particle size mesh of...

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Abstract

The invention belongs to the technical field of concrete materials, and more particularly relates to a traffic detection device wall. Octa(aminophenyl)octasilsesquioxane is adopted as a silane modifying agent in an organic solvent to reform and modify a hectorite structure to prepare organosilicone modified hectorite, and the organosilicone modified hectorite is compounded with calcium oxide and calcium carboxymethyl cellulose to form an expanding agent used for high-performance shrinkage-compensating concrete. According to the expanding agent provided by the invention, high-temperature calcination is not needed in the preparation process, the prepared expanding agent has a large restrained expansion rate, and under the same technical requirements, the adding amount can be reduced, and thecosts can be reduced.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and more specifically relates to a wall fixing expansion agent for traffic detection equipment and a preparation method thereof. Background technique [0002] Intelligent transportation equipment is generally installed on the wall. Because it involves personal safety, the stability requirements for equipment detection are very high. In order to improve the stability of the installation wall of intelligent transportation detection equipment, many methods have been proposed in the prior art. [0003] Shrinkage-compensating concrete relies on the expansion product generated by the hydration reaction of the expansion agent to establish a precompressive stress of 0.2-0.7MPa inside the concrete, so that it can effectively compensate or partially compensate for the concrete’s drying shrinkage deformation and temperature deformation, and is the key to preventing and reducing concrete cracking. ...

Claims

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Application Information

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IPC IPC(8): C04B24/42
Inventor 滕诣迪张励毛春雨
Owner 常熟京常智能科技有限公司
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