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Composite additive capable of preventing CA mortar laminated segregation

A compound additive and mortar technology, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems affecting the construction performance and long-term use performance of CA mortar, and high separation, so as to extend the working time, Effect of increasing early strength and preventing delamination and segregation

Inactive Publication Date: 2007-09-19
HUBEI GUOCHUANG HI TECH MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in CA mortar, the density difference between emulsified asphalt and cement is about 3 times, and the density difference between emulsified asphalt and sand is about 2.5 times, so it is easy to layer and segregate, that is, asphalt floats to the surface of CA mortar. The evaporation of the free water produced will cause a large volume shrinkage of the CA mortar, thus directly affecting the construction performance and long-term performance of the CA mortar; however, the existing CA mortar products do not solve these problems well, although The separation degree of some CA mortar products is less than 3%, but the separation degree is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 8

[0025] 300kg cement + 480kg emulsified asphalt + 600kg sand + 60kg additional water + 60kg composite additive (30kg silica fume + 30kg calcium-based bentonite). After weighing all raw materials according to the proportion, add them to the mixer and stir for 100 seconds at the same time. The main technical indicators of the prepared CA mortar are: working time 70 minutes, expansion rate -0.7%, 1d compressive strength 0.25MPa, 3d compressive strength 0.4MP, material separation degree 1.1%.

Embodiment 9

[0027] 300kg cement + 480kg emulsified asphalt + 600kg sand 60kg plus water + 90kg composite additive (30kg silica fume + 30kg fly ash Class I ash + 30kg calcium-based bentonite), after weighing all raw materials according to the proportion, add them to the mixer and stir for 100 Second. The main technical indicators of the prepared CA mortar are: working time 75 minutes, expansion rate -0.4%, 1d compressive strength 0.25MPa, 3d compressive strength 0.4MP, material separation 0.6%.

Embodiment 10

[0029] A composite additive that can effectively prevent CA mortar delamination and segregation. It is mainly composed of silica fume, bentonite and fly ash. The parts by weight of each raw material are: silica fume: 100 parts, bentonite: 80 parts, and fly ash: 10 parts; described bentonite is sodium bentonite, specific surface area 600m 2 / kg or more; the specific surface area of ​​silica fume is 18000m 2 / kg or more; the specific surface area of ​​fly ash is 400-800m 2 / kg. After all the raw materials are weighed according to the proportion, they are added into the mixer together and stirred for 100 seconds. A composite additive that can effectively prevent CA mortar delamination and segregation is applied to CA mortar, and the addition amount of the composite additive that can effectively prevent CA mortar delamination and segregation is 0.4% of the weight of CA mortar.

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Abstract

The present invention relates to a kind of composite additive capable of preventing CA mortar from laminating segregation. The present invention features that the composite additive consists of silica fume 100 weight portions, bentonite 5-350 weight portions and flyash 0-250 weight portions. The bentonite is one of sodium-base bentonite, calcium-base bentonite and sodium-calcium base bentonite, or their mixture, and has specific surface area 400-1000 sq m / kg; the silica fume has specific surface area18000-23000 sq m / kg; and the flyash has specific surface area300-800 sq m / kg. The composite additive of the present invention has the functions of improving the work performance of CA mortar, preventing CA mortar from laminating segregation, raising the early strength of CA mortar and raising the antifreeze and durability of CA mortar, and has wide application foreground in high speed railway construction.

Description

technical field [0001] The invention relates to a compound additive which can effectively prevent layering and segregation of CA mortar. technical background [0002] With the enhancement of comprehensive national strength, my country's high-speed railway network construction plan will be gradually put into practice. It is estimated that before 2020, my country will initially build a high-speed railway network with a speed of more than 200km / h. CA mortar is a key component of slab ballastless track. On the one hand, it can make the track have reasonable elasticity, and on the other hand, it is convenient to adjust the track construction error. Therefore, the use of CA mortar elastic damping material is very important for improving the safety and ride quality of trains at high speeds. Comfort plays a very important role. In addition, compared with high-elastic rubber materials, it also has the advantages of good contact with the bottom surface of the track slab, convenient c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B24/36C04B14/12C04B18/08
CPCY02W30/91
Inventor 王发洲胡曙光王涛丁庆军叶家军高涛邹进忠
Owner HUBEI GUOCHUANG HI TECH MATERIAL