Method for rapidly detecting stability of steel slag fine aggregate

Abstract

The invention discloses a method for rapidly detecting the stability of steel slag fine aggregate. The method comprises the following steps of: dividing the steel slag fine aggregate into grain grades of 0.15-0.3mm, 0.3-0.6mm, 0.6-1.18mm, 1.18-2.36mm and 2.36-4.75mm according to different grain diameter ranges of steel slag grains; instantly determining the self autoclave pulverization rate of each grain grade of the aggregate; determining the largest grain diameter of the selected steel slag fine aggregate by taking each grain grade of an autoclave pulverization rate mutational site as an evidence; then preparing building mortar test blocks with different steel slag doping amounts by taking the largest grain diameter as an upper limit; curing for 3 days under the standard condition and carrying out an autoclave test; and determining the largest displacement amount of the steel slag fine aggregate when the volume is stable according to the volume change of the mortar test blocks after the autoclave test. Compared with building mortar prepared by using common sand, the use amount of natural sand is saved and the risk of resource exhaustion of a sand source is reduced. The method disclosed by the invention has the important meanings to ecological balance and environment coordination maintenance.

Description

technical field [0001] The invention belongs to steel slag mortar in the construction field, and in particular relates to a method for quickly detecting the stability of steel slag fine aggregate, which can ensure the safe use of steel slag fine aggregate with a short stacking period to prepare environment-friendly steel slag mortar. Background technique [0002] Construction mortar is widely used and used in a large amount in the construction field. With the rapid expansion of project construction scale, the amount of construction sand and gravel has also increased sharply. In the past, sand and gravel aggregates were obtained by cutting mountains and stones, and faced serious depletion problems. Instead of natural sand and gravel The preparation of building mortar has become an urgent problem in this field. [0003] As a by-product of steelmaking, steel slag is discharged in the form of particles. Now it is mostly ground and used as an admixture. The physical and mechanic...

AI Technical Summary

Problems solved by technology

However, because steel slag contains potentially unstable components such as f-CaO and MgO, it has always been a bottleneck restricting the application of steel slag engineering.

As steel slag particles used in construction, although the national standard proposes a stability test method, there are still changes in the application due to different storage periods of steel slag, different composition content, and different types of steelmaking furnaces. Currently, it is tested according to the national standard. It is still uncertain whether the steaming pulverization rate index of steel slag particles will cause harm to the project

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