Nano suspension liquid concrete early strength agent and preparation method thereof

A nano-suspension and concrete technology, which is applied in the field of early-strength concrete admixture, concrete early-strength agent based on nanotechnology and its preparation, can solve the problems of insufficient early-strength effect, complicated preparation process, and decreased durability of concrete. Achieve the effect of being conducive to active excitation, excellent early strength performance, and improving early strength

Active Publication Date: 2016-02-17
JIANGSU SOBUTE NEW MATERIALS
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  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantages of the existing early strength agents, such as insufficient early strength effect at the age of several hours to one day, easy reduction of concrete durability, complicat...

Method used

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  • Nano suspension liquid concrete early strength agent and preparation method thereof
  • Nano suspension liquid concrete early strength agent and preparation method thereof
  • Nano suspension liquid concrete early strength agent and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0020] (1) Preparation of polymer dispersant

[0021] Prepare the polymer with molecular formula (I) according to Chinese patent 20110393582.0, and without neutralization, its molecular formula is:

[0022]

[0023] The above polymer solution was neutralized with calcium oxide or zinc oxide to obtain a polymer dispersant with a solid content of 40%, as shown in Table 1.

[0024] Table 1 Parameters and codes of polymer dispersants

[0025]

[0026] (2) Preparation of nano-suspension concrete early strength agent

[0027] The solution that the high molecular polymer dispersant that step (1) makes and soluble calcium salt, soluble zinc salt, soluble aluminum salt is formed adds in the there-necked flask of 500ml, under the condition of 10-20 ℃, stirs rapidly; Then put The soluble silicate is formulated into an aqueous solution, which is slowly added dropwise to the above mixed solution for 5-8 hours. Concrete preparation example is as follows:

preparation Embodiment 1

[0029] In a 500mml three-necked flask, 75gP1, 11.8gCa(NO 3 ) 2 4H 2 O, 19.0gAl(NO 3 ) 3 9H 2 O, 7.5gZnNO 3 ·7H 2 O was dissolved into 136.7g of water, and then Na with a mass concentration of 5.7% 2 SiO 3 9H 2 Add 250 g of O sodium silicate solution dropwise to the mixed solution for 8 hours, and keep the temperature of the solution at 18° C. during the dropwise addition.

preparation Embodiment 2

[0031] In a 500mml three-necked flask, 100gP3, 11.3gCa(NO2 ) 2 2H 2 O), 15.0g (Al(NO 3 ) 3 9H 2 O, 6.0gZnNO 3 ·7H 2 O was dissolved into 167.7g of water, and then the mass concentration was 7.2% Na 2 SiO 3 9H 2 Add 200 g of O sodium silicate solution dropwise to the mixed solution for 6 hours, and keep the solution temperature at 20°C during the dropwise addition.

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Abstract

The invention provides a nano suspension liquid concrete early strength agent and a preparation method thereof. The nano suspension liquid concrete early strength agent is prepared from transition metal element doped nano calcium metasilicate suspension liquid, the suspension liquid is mainly composed of nanometer silicon particles, the chemical structure of the nanometer silicon particles is aCaO.bAl2O3.cZnO.SiO2.6H2O, 1<=a<=2, 0.50<=b<=1, and 0.25<=c<=0.50. The nanometer silicon particles are prepared from soluble calcium salt, soluble silicate, soluble aluminum salt, soluble zinc salt and a high polymer dispersing agent. On the one hand, the early strength agent contains no chlorine salt and has no corroding function on steel bars in concrete; on the other hand, an extremely stable suspension liquid system is achieved, adding is facilitated, and the early strength agent can be evenly dispersed easily in the concrete preparation process. The early strength of concrete can be remarkably improved, the early strength effect on concrete adopting highly-doped mineral admixtures is especially obvious, the early strength agent is especially suitable for production of precast concrete components, and a steam maintenance process can be effectively reduced and even omitted.

Description

technical field [0001] The invention relates to an early-strength concrete admixture, in particular to a nanotechnology-based concrete early-strength admixture and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] Concrete is currently the most used building material in the world, and its main advantages are low price, strong bearing capacity and high durability. However, due to the slow hydration reaction process of Portland cement and the influence of ambient temperature, the strength of concrete develops slowly. Generally, it takes more than 24 hours to reach the strength of the demolition formwork, and the strength can only reach 40-50% of the design strength in 3 days. It takes more than 28 days to reach the design strength. At the same time, with the development of concrete technology, industrial wastes are used as basic raw materials in concrete more and more widely. In order to improve the durability...

Claims

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Application Information

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IPC IPC(8): C04B24/32
Inventor 刘加平张建纲杨勇冉千平舒鑫毛永琳曹攀攀
Owner JIANGSU SOBUTE NEW MATERIALS
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