CN103123310A

CN103123310A - Method for rapidly detecting stability of steel slag fine aggregate

Info

Publication number: CN103123310A
Application number: CN2013100483816A
Authority: CN
Inventors: 尚建丽; 赵世冉; 李翔
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2013-02-06
Filing date: 2013-02-06
Publication date: 2013-05-29

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

A kind of method of fast detecting slag thin aggregate stability

Technical field

The invention belongs to the slag mortar of building field, be specifically related to a kind of method of fast detecting slag thin aggregate stability, can guarantee that safe utilization stacking shorter slag thin aggregate of phase prepares the environmental protection steel slag mortar.

Background technology

Building mortar is wide in the building field purposes, consumption is large, rapid expansion along with construction scale of projects, building sandstone consumption also sharply increases, the acquisition Aggregate made a sudden snatch by cutting into a mountain in the past, be faced with the problem of serious exhaustion, substituting natural sandstone preparation building mortar has become the problem that this field needs to be resolved hurrily.

Slag is as the secondary product of steel-making, emit with particle form, mostly it is carried out now after grinding as admixture, yet as the graininess slag, having proved that every mechanics index of physics such as its grain composition, crush values, attrition rate are better than common grouan, Irish touchstone or limestone gravel and river sand, is the ideal substitute of natural rubble and sand.But contain the latent instability compositions such as f-CaO and MgO due to slag, become the bottleneck that restriction slag engineering is used all the time.Steel slag particle as Application in Building, although national standard has proposed stable test method, but, still exist the invar slag difference of storage period, component content difference, the dispar variation of converter kind in application, detect at present the pressure steaming pulverization rate index of steel slag particle according to national standard, can't determine whether and to work the mischief to engineering.Therefore, take slag thin aggregate as raw material, propose a kind of method of fast detecting slag thin aggregate stability, the safety and efficacy that slag is used at building mortar can produce great effect.

Summary of the invention

For improving the slag mortar in the reliability of building engineering field safety applications, the object of the invention is to, a kind of method of fast detecting slag thin aggregate stability is provided.

In order to realize above-mentioned task, the present invention takes following technical solution:

a kind of method of fast detecting slag thin aggregate stability, it is characterized in that, at first the method is divided into 0.15mm～0.3mm according to steel slag particle different-grain diameter scope, 0.3mm～0.6mm, 0.6mm～1.18mm, 1.18mm the grade of～2.36mm and 2.36mm～4.75mm, at once measuring each grade gathers materials and self press to steam pulverization rate, press take each grade and steam the pulverization rate catastrophe point as foundation, determine the maximum particle diameter of selected slag thin aggregate, and then with this particle diameter as the upper limit, prepare the building mortar test block of different steel slag contents, standard curing was pressed and is steamed test in 3 days, according to pressing the volume change of steaming the rear mortar specimen of test, the maximum of the slag thin aggregate when determining to reach volume stability substitutes amount.

The method of detection slag thin aggregate stability of the present invention, its main creativeness is, for stacking half a year phase with interior slag, how to evaluate safely and effectively it as fine aggregate, can not cause stability to destroy to building mortar in using, compare with existing national standard, given prominence to the contribution aspect stable of slag thin aggregate different-grain diameter, can determine to shorter slag of stacking phase the alternative amount of fine aggregate safety, simultaneously, compare with the building mortar of normal sands preparation, greatly saved natural sand and stone resources, reduced the resource exhaustion risk that the sand source faces.For the ecologic equilibrium, to keep environmental harmony significant.

Description of drawings

Fig. 1 is that the simple grain level presses steaming pulverization rate and standard to press steaming pulverization rate histogram;

Fig. 2 is that to adopt maximum particle diameter 2.36mm and volume be the mortar picture that 25% slag is made;

Fig. 3 is that to adopt maximum particle diameter 1.18mm and volume be the mortar picture that 25% slag is made;

Fig. 4 is different-grain diameter, different steel slag content mortar compressive strength variation diagram;

Fig. 5 is that different-grain diameter, different steel slag content Mortar shrinkage are with variation diagram in the length of time;

The present invention is described in further detail below in conjunction with drawings and Examples.

Embodiment

prepare building mortar take the slag solid waste as raw material, maximum difficult point is that shorter slag of stacking phase can cause the unstable of mortar volume, the present embodiment provides a kind of method of fast detecting slag thin aggregate stability, be divided into 0.15mm～0.3mm with interior steel slag particle different-grain diameter scope half a year phase to stacking, 0.3mm～0.6mm, 0.6mm～1.18mm, 1.18mm five kinds of grades of～2.36mm and 2.36mm～4.75mm, measuring at once each grade gathers materials and self press to steam pulverization rate, press take each grade and steam the pulverization rate catastrophe point as foundation, determine the maximum particle diameter of selected slag thin aggregate, and then with this particle diameter as the upper limit, prepare the building mortar test block of different steel slag contents, standard curing 3 days, press and steam test, according to pressing the volume change of steaming the rear mortar specimen of test, the maximum of the slag thin aggregate when determining to reach volume stability substitutes amount.

It is to sieve to cross respectively each lower size the single-stage pressure steaming pulverization rate that records that the pressure of described steel slag particle particle size range is steamed pulverization rate., press and steam test after 3 days with the maintenance of particle diameter upper limit preparation mortar specimen, the maximum of the slag thin aggregate when determining to reach volume stability substitutes amount.

Use said method, press by the simple grain level and steam test, and determined to guarantee the steel slag particle volume of stability, namely can take full advantage of the slag discarded object, can overcome again the contradiction between steel slag content and volume stability to greatest extent.Can enlarge the consumption of building iron slag mortar, pile up like a mountain, land occupation for solving slag, keeps ecological balance, to keep environmental harmony significant.

It is below concrete implementation process.

1, slag thin aggregate physical property

The slag thin aggregate of stacking phase within half a year, its Fundamental Physical Properties is as shown in table 1.1.

Table 1.1: slag thin aggregate Fundamental Physical Properties test

Apparent density kg/m ³	Bulk density kg/m ³	Voidage %	Water percentage %	Crush values %
					3256	1580	51	0.8	17

2, the simple grain level is pressed and is steamed pulverization rate

Fig. 1 is that the simple grain level that the applicant provides through overtesting is pressed the histogram that steams pulverization rate and standard method pressure steaming pulverization rate, can clearly find out from figure, particle size range increase along with slag, the simple grain level of slag presses the steaming pulverization rate also to increase, and standard method has only stipulated that particle diameter is the pressure steaming pulverization rate (take the 1.18mm particle diameter as the screening lower limit) of 2.36mm～4.75mm.

3, the impact of slag particle diameter on Steel-slag Sand volume of slurry stability

Single-stage pressure in conjunction with slag thin aggregate is steamed pulverization rate, has studied the different maximum particle diameter slag of different addition quantity mortar specimen and has pressed the rear appearance change of steaming to see Table 3.1.

Table 3.1: appearance change after the different maximum particle diameter slag of different addition quantity mortar is pressed and steamed

As can be seen from the table, use the slag thin aggregate of stacking phase shorter (in half a year), when the slag particle diameter (during 0.15mm～4.75mm), can not satisfy mortar volume stability requirement (when being 10% except volume) in the code requirement scope.But after reducing the slag maximum particle diameter (0.15mm～1.18mm or less than 1.18mm time), slag thin aggregate substitutes amount can rise to 25% or 30%, and mortar volume still can satisfy stability requirement.

Referring to Fig. 2 and Fig. 3, it is that 2.36mm and volume are the mortar made of 25% slag and to adopt maximum particle diameter 1.18mm and volume be the mortar that 25% slag is made that the applicant adopts maximum particle diameter.

1) compressive strength

Satisfying under the stability requirement of Steel-slag Sand volume of slurry, select reasonable steel slag content corresponding to different-grain diameter to carry out the compressive strength test of slag mortar, wherein selecting particle diameter is considering by 10% volume of 0.15mm～4.75mm grade, particle diameter be 0.15mm～1.18mm grade by 25% volume, carry out respectively the compressive strength test under the different length of times, test result is seen Fig. 4.

Test shows: the compressive strength when steel slag content reaches 25% is suitable with the intensity of not mixing slag as aggregate in early days, and the slag that explanation can take full advantage of larger volume reaches the unification of volume and mechanical property.

2) shrinkability is excellent

Because the mortar distortion causes the mortar cracking, cause permanance to descend, the present embodiment has carried out the shrinkage test of steel slag instead sand to this, and test result is seen Fig. 5.Shrink minimum during steel slag content 25%.

Claims

1. the method for a fast detecting slag thin aggregate stability, it is characterized in that, at first the method is divided into 0.15mm～0.3mm according to steel slag particle different-grain diameter scope, 0.3mm～0.6mm, 0.6mm～1.18mm, 1.18mm the grade of～2.36mm and 2.36mm～4.75mm, at once measuring each grade gathers materials and self press to steam pulverization rate, press take each grade and steam the pulverization rate catastrophe point as foundation, determine the maximum particle diameter of selected slag thin aggregate, and then with this particle diameter as the upper limit, prepare the building mortar test block of different steel slag contents, standard curing 3 days, press and steam test, according to pressing the volume change of steaming the rear mortar specimen of test, the maximum of the slag thin aggregate when determining to reach volume stability substitutes amount.

2. the method for claim 1, is characterized in that, it is to sieve to cross respectively each lower size the single-stage pressure steaming pulverization rate that records that described pressure is steamed pulverization rate.