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A method for inhibiting concrete alkali silicic acid reaction

An alkali silicic acid reaction and concrete technology, which is applied in the field of inhibiting the alkali silicic acid reaction of concrete, can solve the problems of high cost, admixture source and cost limitation, etc., to control peripheral effects, save procurement costs, and reduce grinding time Effect

Active Publication Date: 2021-02-26
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for inhibiting the alkali silicic acid reaction of concrete, which can effectively inhibit the alkali silicic acid reaction of concrete after processing the existing alkali active materials, and solves the problem of the current technology. Cutting-edge issues such as high cost, source of admixtures and cost constraints in the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]The present invention includes the following steps:

[0022]S1: Take alkali activated flint aggregate and grind it with a ball mill for 0.5h to form a specific surface area of ​​394.2m2 / kg of powdery material to make it have pozzolanic activity;

[0023]S2: Mixing powdered materials, concrete raw materials (including alkali-activated flint aggregate) and concrete cementing materials, wherein the mixing amount of the powdered materials is 50% of the total weight of the concrete gel materials.

[0024]Using the mortar bar rapid method to test the mixed concrete, the expansion rate of 14 days and 56 days were 0.085% and 0.097%, and the expansion rate reduction rate of 14 days and 56 days were 74.3% and 80.9%, respectively. The swelling rate is lower than 0.1%, which is the standard line recognized as alkali-active materials and can be used directly. Moreover, the reduction rate of the expansion rate is at the middle to upper level, which guarantees the maintenance effect in the later peri...

Embodiment 2

[0026]The present invention includes the following steps:

[0027]S1: Take alkali activated flint aggregate and grind it with a ball mill for 1.0h to form a specific surface area of ​​542.5m2 / kg of powdery material to make it have pozzolanic activity;

[0028]S2: Mixing powdered materials, concrete raw materials (including alkali-activated flint aggregate) and concrete cementing materials, wherein the mixing amount of the powdered materials is 40% of the total weight of the concrete gel material.

[0029]Using the mortar bar rapid method to test the mixed concrete, the expansion rate of 14 days and 56 days were 0.057% and 0.070%, respectively; while the expansion rate reduction rate of 14 days and 56 days were 82.8% and 86.2%, respectively.

Embodiment 3

[0031]The present invention includes the following steps:

[0032]S1: Take alkali activated flint aggregate and grind it with a ball mill for 1.5h to form a specific surface area of ​​701.2m2 / kg of powdery material to make it have pozzolanic activity;

[0033]S2: Mixing powdered materials, concrete raw materials (including alkali-activated flint aggregate) and concrete cementitious materials, wherein the mixing amount of the powdered materials is 30% of the total weight of the concrete gel material.

[0034]The mortar bar rapid method was used to test the mixed concrete, and the expansion rates of 14 days and 56 days were 0.065% and 0.075%, respectively; while the expansion rates of 14 days and 56 days were 80.4% and 85.3%, respectively.

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Abstract

The invention relates to a method for inhibiting alkali silicic acid reaction of concrete, comprising the following steps: S1, grinding alkali active aggregate into a powdery material with pozzolanic activity, and the specific surface area of ​​the powdery material is ≥300m2 / kg; S2, The powdery material is mixed into the concrete for mixing, and the proportion of the powdery material to the total weight of the concrete cementitious material is greater than or equal to 20%. The effect of inhibiting the alkali silicic acid reaction can be achieved after the concrete raw material is powdered, which greatly reduces the production cost and transportation cost, and also improves the purity of the mixture content of the concrete.

Description

Technical field[0001]The invention relates to the technical field of cement-based concrete materials, in particular to a method for inhibiting the alkali-silicic acid reaction of concrete.Background technique[0002]Concrete (referred to as "concrete") is obtained by mixing cementitious materials, sand and stone in a certain proportion with water (may contain additives). Cement, admixtures, mixtures, water, and alkali in sand and gravel aggregates in concrete will have a slow alkali-aggregate reaction during concrete pouring, which can cause internal stress in the poured concrete. Extending, the internal stress will become larger and larger, and the poured concrete will expand and crack, and this kind of cracking cannot be remedied, and it can only cause the scrapped and demolished building in severe cases. Alkali-aggregate reaction refers to the phenomenon that specific internal components in alkali-active aggregate react chemically with alkali in concrete under certain conditions, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B22/06C04B22/14C04B14/06
CPCC04B20/026C04B22/064C04B22/143C04B14/06
Inventor 吴建华张辉杨飞
Owner CHONGQING UNIV
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