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Concrete additive for inhibiting alkali aggregate reaction and its production

A concrete admixture and preparation process technology, applied in the application, ceramic products, other household appliances, etc., can solve the problems of unfavorable early strength of concrete, pollute the environment, etc., and achieve the effect of inhibiting the reaction of alkali silicic acid

Inactive Publication Date: 2007-04-04
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

NH produced by this method 4 Although zeolite powder can inhibit the alkali-aggregate reaction, it will release NH with a pungent odor when used. 3 , not only pollute the environment, but also detrimental to the early strength of concrete when the dosage is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Immerse natural zeolite powder in 1mol / L (NH 4 ) 2 CO 3 In aqueous solution, boil for 1 hour to obtain ammonium zeolite, then dry at 400°C for 2 hours to remove NH 3 and activate H + Adsorption site, to obtain concrete admixture, when replacing 5% of cement in equivalent amount, according to the standard of American Society for Testing and Materials (ASTM C441 standard), the 14-day expansion rate of glass mortar rods is 0.0883%, which is 69.5% lower than that of reference specimens.

Embodiment 2

[0015] Immerse natural zeolite powder in 1mol / L (NH 4 ) 2 CO 3 Boiling 1h in the aqueous solution, other measures are with embodiment 1, made concrete admixture, according to American Society for Testing and Materials standard (ASTM C441 standard) during the time of dosage 5%, detect glass mortar bar 14 days expansion rate is 0.0812%, relatively The baseline test piece was reduced by 72%.

Embodiment 3

[0017] Immerse natural zeolite powder in 1mol / L (NH 4 ) 2 CO 3 Boiling 1h in the aqueous solution, other measures are with embodiment 1, made concrete admixture, according to American Society for Testing and Materials standard (ASTM C441 standard) during the time of dosage 5%, detect glass mortar bar 14 days expansion rate is 0.0812%, relatively The baseline test piece was reduced by 72%.

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PUM

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Abstract

A concrete additive for inhibiting alkali aggregate reaction adopts improved zeolite, which consists of Si-O tetrahedrold with H+ adsorption and Al-O tetrahedrold in proportion of SiO2:Al2O3=2:1mol, and adsorptive capacity of H+ in improved zeolite is 120-180mmol / 100g. The process is carried out by immersing natural zeolite into 1-5mol / L (NH4)2CO3 solution in proportion of 1:3 -1:5mol, boiling for 1-2hrs, displacing K+ and Na+ of zeolite with NH4 to obtain NH4 zeolite, drying NH4 zeolite at 400-500 degree for 2-3hrs, removing NH3 while activating H+ adsorptive site to obtain concrete additive, sealing, storing, discharging dried tailed gas with CO2 and NH3 into mother liquid and circulation utilizing. It has less adulteration, better early concrete strength and performance and no environmental pollution.

Description

Technical field [0001] The invention relates to a concrete additive and a preparation process, in particular to a concrete admixture for inhibiting alkali-aggregate reaction and a preparation process. Background technique [0002] The alkali-aggregate reaction is the reaction between the alkali (KOH, NaOH) in concrete and the active sandstone aggregate, and the reaction product is SiO 2 Gel, because the reaction product can absorb water and expand, causing concrete cracking and destruction. At present, alkali aggregate reaction has become an important factor affecting the durability of concrete. [0003] The occurrence of alkali-aggregate reaction needs to meet three conditions at the same time, that is, the aggregate has alkali activity, there is sufficient alkali content in the concrete, and the concrete is in contact with water. In the wet concrete structure in the active aggregate area, the alkali content of the concrete is the induced alkali. The main factor of aggrega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08C04B38/08
Inventor 牛全林
Owner SHANDONG UNIV OF TECH
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