CN102276206B

CN102276206B - Method for preparing concrete by using chippings from iron to replace natural sand

Info

Publication number: CN102276206B
Application number: CN201110176007A
Authority: CN
Inventors: 毕文卓; 王春林
Original assignee: 1 ST CONSTRUCTION CO Ltd OF 22 MCC GROUP; China 22MCC Group Corp Ltd
Current assignee: 1 ST CONSTRUCTION CO Ltd OF 22 MCC GROUP; China 22MCC Group Corp Ltd
Priority date: 2011-06-28
Filing date: 2011-06-28
Publication date: 2012-09-12
Anticipated expiration: 2031-06-28
Also published as: CN102276206A

Abstract

The invention relates to a method for preparing concrete by using chippings from iron to replace natural sand. The method which treats the chippings from iron as an aggregate to prepare the concrete comprises the following steps: 1, blending the chippings from iron: selecting the chippings from iron which accords with standards of sand in an II zone for stirring the concrete as the aggregate; 2, preparing the concrete: mixing 65-75 parts by weight of concrete with 25-35 parts by weight of the chippings from iron; and 3, adjusting the concrete: adding 2-3 parts by weight of coal ash, and 0.3-0.5 parts by weight of an additive to each 100 parts by weight of concrete. According to the invention, problems of destroyed ecology and polluted environment caused by natural sand exploitation are effectively solved, and simultaneously a reuse approach of a mineral processing waste "the chippings from iron" is found to change wastes into valuables. Three purposes of ecological balance maintenance, resource environment protection, and concrete material cost reduction are realized, so the method of the present invention has the advantages of natural sand saving, mine tailing waste consumption, concrete material cost reduction, and substantial economic benefit.

Description

Select chip to substitute the method for natural sand concrete batching with iron

Technical field

The present invention relates to a kind of method of concrete batching, specifically select chip to substitute the method for natural sand concrete batching with iron.

Background technology

In the present concrete production whipping process; Its fine aggregate is main with natural river sand mainly; Along with the ready mixed concrete industry develops rapidly, to stirring with the quality of sand, the raising and the natural sand shortage of resources of quantitative requirement, downgrade has formed more sharp-pointed contradiction.For this reason, it is problem demanding prompt solution that the material that seek to substitute natural sand comes concrete batching.

Summary of the invention

Goal of the invention of the present invention is to remedy prior art natural sand scarcity of resources, and is not enough with degradation under the chiltern amount, provides a kind of iron to select chip 100% to substitute the method for natural sand as the concrete fine aggregate concrete batching.

Realize that above-mentioned purpose adopts following technical scheme: a kind ofly select chip to substitute the method for natural sand concrete batching, it is characterized in that said method is to select chip as the aggregate concrete batching with iron, comprises the steps: with iron

A. allocate iron and select chip: select for use to meet the iron that concrete stirs with II district medium sand standard and select chip as aggregate;

B. concrete batching: according to the parts by weight meter, concrete 65-75 part, iron selects chip 25-35 part;

C. adjust concrete: according to the parts by weight meter, the concrete of per 100 parts by weight adds flyash 2-3 part, admixture 0.3-0.5 part.

As preferred version: described iron selects chip to select for use the iron of Qianan City, Hebei province, Zunhua City's two real estates to select chip as aggregate; The iron of Qianan City, Zunhua City's two real estates is selected the part by weight mixing preparation of chip according to 7:3, obtain meeting the aggregate iron that concrete stirs with II district medium sand standard and select chip as aggregate.

As preferred version: described admixture adds X 2073 and wheat starch component, and according to the parts by weight meter, the concrete of 100 weight parts adds the X 2073 of 0.0004 weight part, adds the wheat starch of 0.004 weight part.

Adopt technique scheme, solved exploitation natural sand effectively and damaged ecology, problem of environment pollution caused, also found the salvage pathway of " iron selects chip " this ore dressing waste simultaneously, making it turns waste into wealth.Triple purposes of the eubiosis, resources conseravtion environment, reduction concrete material cost have been realized keeping; The present invention practices thrift natural sand; Consume the tailing waste thing, reduce the concrete material cost; Remarkable in economical benefits makes whole concrete industry move towards the road of the Sustainable development of energy-conserving and environment-protective, green high-efficient.

Embodiment

Below in conjunction with embodiment the present invention is done further description.

Present embodiment is a kind ofly to select chip to substitute the method for natural sand concrete batching with iron, and its design philosophy is to adopt iron to select chip 100% to substitute the natural sand concrete batching, and its method steps is following:

1. iron selects the selected and allotment of chip

Select the chemical ingredients of chip, its main oxides SiO through detecting Qianan City, Hebei province, Zunhua City's two subways ₂, Al ₂O ₃, the CaO equal size is close with natural river sand, and selects impurity and objectionable constituent (sulfide and vitriol, mica, Socryl Blue BRL MB value) content in the chip through measuring iron, all do not exceed " building sand standard " GB/T14684-2001 specified standards.Through comprehensive index analysis, two kinds of mine tailings all satisfy buildings II class and use the sand standard.

Owing to use the iron in two places of production to select chip to satisfy not particle diameter and the grating requirement of concrete mixing separately with sand fine aggregate; Therefore carry out the allotment work that two kinds of iron select chip; Respectively according to the Qian'an: the ratio of Zunhua=3:7,1:1,7:3 is allocated; Confirm at last with the Qian'an: the iron that Zunhua=the 7:3 ratio mixes selects the particle diameter of chip the most approaching with the grain diameter characteristic of grating and natural river sand, meets the concrete stirring with II district medium sand standard.

2. concrete batching: according to the parts by weight meter, 100 parts of concrete, iron content is selected 30 parts of chips, and other starting material in the concrete and iron powder chip are mixed;

3. adjustment concrete: in the process that stirs, according to the parts by weight meter, the concrete of per 100 parts by weight adds flyash 2-3 part, admixture 0.3-0.5 part.

4. carry out the contrast of workability and strength trial with the natural sand fresh concrete, similar basically, satisfy request for utilization.And selecting chip to mix the system concrete to iron carries out long-term performance test and radioassay, confirms to meet relevant material of construction and use standard.

Admixture of the present invention is " wheat starch " of introducing the thickening component of 1 ‰ bleed composition " X 2073 " and 1%; Solved fresh concrete bleeding and the bad problem of flowing property effectively, the pressure bleeding value of fresh concrete is reduced greatly.

Precaution of the present invention and treatment process

1) aggregate branch storehouse: will divide the storehouse with fine aggregate in the actual production process, select chip to divide two storehouses to prepare burden the iron in two places of production, starting material are marched into the arena and are wanted the water ratio of strict control fine aggregate, need held stationary consistent.

2) avoid bleeding: receive the influence of self morphological specificity and formation condition and surface characteristic because of iron selects chip; Its water-retentivity is not as natural sand; Poor water retention property, mobile problem such as bad have appearred during common pump concrete in the system of mixing; If control will not stopped up the phenomenon that don't manage in the concrete pumping process fortunately, incur loss through delay concrete placement and construction, so should note avoiding its bleeding.

3) receive iron to select the influence of detrital grain form; Because the water consumption of concrete batching is higher slightly than natural sand; Cause wc increase, late strength of concrete to descend, for this situation, the present invention adopts the technological method that improves late strength of concrete to eliminate these drawbacks; Specific practice is: the one, reduce concrete mixing water amount, and make water consumption be no more than 180Kg/m ³, reducing wc, the water-binder ratio that is used for the structure weight bearing area is controlled at (control folk prescription concrete water quality is not more than 0.45 with the ratio of the quality of gelling material) below 0.45.The 2nd, the water-reducing rate of raising concrete admixture, it is composite to adopt naphthalene water reducer and sulfamate water reducer to carry out according to the ratio of mass ratio 3:1, and best results can reduce folk prescription concrete water amount more than 20%.

More than disclosedly be merely specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop within protection scope of the present invention.

Claims

1. one kind is selected chip to substitute the method for natural sand concrete batching with iron; Said method is to select chip as the fine aggregate concrete batching with iron, comprises the steps: that a. allotment iron selects chip: select for use to meet the iron that concrete stirs with II district medium sand standard and select chip as fine aggregate; B. concrete batching: according to the parts by weight meter, concrete 65-75 part, iron selects chip 25-35 part; C. adjust concrete: according to the parts by weight meter, the concrete of per 100 parts by weight adds flyash 2-3 part, admixture 0.3-0.5 part; Described admixture contains X 2073 and wheat starch component, and according to the parts by weight meter, the concrete of 100 weight parts adds the X 2073 of 0.0004 weight part, adds the wheat starch of 0.004 weight part; It is characterized in that; Described iron selects chip to select for use the iron of Qianan City, Hebei province, Zunhua City's two real estates to select chip as fine aggregate; The iron of Qianan City, Zunhua City's two real estates is selected the part by weight mixing preparation of chip according to 7:3, obtain meeting the iron that concrete stirs with II district medium sand standard and select chip as fine aggregate.