CN104671712A - Compact concrete doped with coal ash and sandy spoil and preparation method thereof - Google Patents

Abstract

The invention discloses compact concrete doped with coal ash and sandy spoil. The concrete comprises the following raw materials: cement, sandy spoil, coal ash, a water reducing agent and water. The raw material proportioning design method is designed by adopting a compactness principle, and the raw materials comprise the following components by mass per cubic meter: 285-337kg of cement, 1211-1268kg of sandy spoil, 362-379kg of coal ash, 3.5-6.6kg of a water reducing agent and 252-266kg of water. The preparation method comprises the following steps: sequentially, fully and uniformly mixing the previous component materials according to the ratio, injecting the materials into a prefabricated mold, vibrating on a vibrating table, and covering a plastic film on the molded test piece, demolding after 24 hours, curing in a constant temperature and constant humidity curing box, thereby obtaining the concrete product. The amount of cement is reduced by doping the coal ash, the sandy spoil is reasonably utilized, and transfer of the sandy spoil and other adverse effects in waterway regulation are reduced.

Description

Compactness concrete of a kind of adding coal ash and grittiness spoir and preparation method thereof

Technical field

The present invention relates to concrete configuring technical, particularly the compactness concrete and preparation method thereof of a kind of adding coal ash and grittiness spoir, belongs to waste utilization and new material technology field.

Background technology

Along with the propelling of Yangtze River waterway regulation, for ensureing the stability of navigation channel bank slope, slope process need be cut to bank slope; Also generation is dredged spoir in a large number in waterway dredging work process.In waterway regulation a large amount of spoir transhipment, store and not only spend huge, and can environment be affected.If waterway engineering spoir resource is prepared into Hydraulic structure Material, material of construction by curing technology, be applied in waterway regulation works and urban construction nearby, also land seizure is reduced while avoiding spoir to transport, reduce construction costs, solve the secondary pollution problem of solid waste, alleviate the impact of waterway regulation works on environment, flyash is also trade waste simultaneously, be used for replacing part of cement, preparation water conservancy project product, by the huge economic benefit of generation and social benefit.

Summary of the invention

For solving the deficiencies in the prior art, the object of the invention is to, compactness concrete that a kind of adding coal ash and grittiness spoir are provided and preparation method thereof, Appropriate application grittiness spoir and flyash, reduce the transhipment of waste soil in waterway regulation, pressure ground and the disadvantageous effect to environment, turn waste into wealth.

Technical scheme of the present invention is: the compactness concrete of a kind of adding coal ash and grittiness spoir, it is characterized in that: described concrete raw material comprises cement, grittiness spoir, flyash, water reducer and water, described raw material every cubic metre quality is: cement 285 ~ 337kg, sandy soil 1211 ~ 1268kg, flyash 362 ~ 379kg, water reducer 3.5 ~ 6.6kg, water 252 ~ 266kg.

The compactness concrete of aforesaid a kind of adding coal ash and grittiness spoir, is characterized in that: described spoir is the grittiness spoir produced after the regulation of two sides, the Changjiang river, and its chemical composition comprises SiO ₂, Al ₂o ₃, Fe ₂o ₃, CaO, MgO, K ₂o, Na ₂o, TiO ₂, SO ₃.

The compactness concrete of aforesaid a kind of adding coal ash and grittiness spoir, is characterized in that: the particle diameter of described grittiness spoir particle is 0.075 ~ 0.3mm.

The compactness concrete of aforesaid a kind of adding coal ash and grittiness spoir, is characterized in that: described cement is gelling material, and described flyash is adulterant.

The compactness concrete of aforesaid a kind of adding coal ash and grittiness spoir, is characterized in that: described cement is the ordinary Portland cement of more than P.O32.5 level.

The compactness concrete of aforesaid a kind of adding coal ash and grittiness spoir, is characterized in that: described water reducer is lignosulfonic acid sodium form water reducer.

The concrete preparation method of compactness of adding coal ash and grittiness spoir, comprises the following steps:

1) in stirrer, first add grittiness spoir according to above-mentioned proportioning, flyash is uniformly mixed, then add cement and be uniformly mixed again;

2) according to above-mentioned proportioning water intaking and water reducer, by both abundant mixing and stirring;

3) by step 2) the obtained aqueous solution containing water reducer slowly adds step 1) stir in obtained mixed material and make mixture;

4) according to forming mould size, take mixture and put into forming mould, put and divide 2 grades of jolt rammings on a vibration table, every grade of vibration 2min;

5) test specimen after shaping is covered plastics film, the demoulding after 24h, be placed in the maintaining box maintenance 28 days of fixed temperature and humidity.

The beneficial effect that the present invention reaches: compactness concrete provided by the invention, Appropriate application grittiness spoir, reduces the transhipment of waste soil in waterway regulation, pressure ground and the disadvantageous effect to environment, turns waste into wealth; Save resource, to the destruction of ploughing when decreasing the pressure of environment and stack; Preparation technology is simple, and cost is low, and its grittiness concrete product prepared can replace the normal concrete of same strength grade, can manufacture the kentledge in waterway engineering, mask brick etc.Its intensity of 28 days of grittiness spoir concrete that the present invention is formed can reach more than C15 resistance to compression design strength, and this intensity can be widely used in multiple fields such as waterway engineering, and popularizing application prospect is wide.

Embodiment

The invention will be further described below.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.

The compactness concrete of a kind of adding coal ash and grittiness spoir, its raw material comprises cement, grittiness spoir, flyash, water reducer and water, unit volume (1 cubic metre) quality is: cement 285 ~ 337kg, sandy soil 1211 ~ 1268kg, flyash 362 ~ 379kg, water reducer 3.5 ~ 6.6kg, water 252 ~ 266kg.

Grittiness spoir in described starting material is the waste produced after the regulation of two sides, the Changjiang river, and chemical composition comprises SiO ₂, Al ₂o ₃, Fe ₂o ₃, CaO, MgO, K ₂o, Na ₂o, TiO ₂, SO ₃, the particle diameter of grittiness spoir particle is 0.075 ~ 0.3mm.

Described grittiness spoir concrete, its cement is gelling material, and flyash is adulterant.Described water reducer is lignosulfonic acid sodium form water reducer.

The mixing proportion design method of described raw material adopts compactness principle to design, and its specific design step is as follows:

1) tap density method of masurement is used to try to achieve the best filling ratio α of flyash and grittiness spoir

$\mathrm{\α}=\frac{M_f}{M_s+M_f}---\left(1\right)$

In formula: M _f, M _sbe respectively the quality of flyash, sandy soil,

Tentatively draft the consumption of grittiness spoir in unit volume, then flyash consumption can be calculated by following formula:

$M_f=\frac{\mathrm{\α}}{z-\mathrm{\α}}{M}_s---\left(2\right)$

2) grittiness spoir and mixture of fly ash material cumulative volume Vt is calculated

$V_t=V_f+V_s=\frac{M_f}{{\mathrm{\ρ}}_f}+\frac{M_s}{{\mathrm{\ρ}}_s}---\left(3\right)$

In formula: ρ _f: flyash apparent density (kg/m ³);

ρ _s: sand apparent density (kg/m ³);

Vf: the volume of flyash;

Vs: the volume of grittiness spoir.

3) void volume after flyash and sand mixture dense packing is calculated

V _v＝1-V _t, (4)

4) grout slurry volume in Units of Account volume

V _p＝n×V _V(5)

In formula: n is slurry surplus coefficiert, general n >1.

5) grittiness spoir and the flyash quality of effective unit volume is calculated

Actual solids mixing material volume is V _t=1-V _p, carry it into formula (6) and (7), grittiness spoir quality and flyash quality can be obtained

$M_s=\frac{1-V_p}{\frac{1}{{\mathrm{\ρ}}_s}+\frac{\mathrm{\α}}{1-\mathrm{\α}}\×\frac{1}{{\mathrm{\ρ}}_f}}---\left(6\right)$

$M_f=\frac{\mathrm{\α}}{1-\mathrm{\α}}\×\frac{1-V_p}{\frac{1}{{\mathrm{\ρ}}_s}+\frac{\mathrm{\α}}{1-\mathrm{\α}}\×\frac{1}{{\mathrm{\ρ}}_f}}---\left(7\right)$

6) water and cement consumption calculate

Cement slurry volume is made up of the volume of cement and water: V _p=V _c+ V _w, and water-cement ratio

$\mathrm{\λ}=\frac{M_w}{B}=\frac{M_w}{\mathrm{Mc}+M_f}$

Can obtain: M _w=λ × (M _c+ M _f) (8)

$V_p=\frac{M_c}{{\mathrm{\ρ}}_c}+\frac{M_w}{{\mathrm{\ρ}}_w}=\frac{M_c}{{\mathrm{\ρ}}_c}+\frac{\mathrm{\λ}\×(M_c+M_f)}{{\mathrm{\ρ}}_w}---\left(9\right)$

Can obtain cement consumption by (9) formula is $M_c=\frac{V_p-\frac{\mathrm{\λ}{M}_f}{{\mathrm{\ρ}}_w}}{\frac{1}{{\mathrm{\ρ}}_c}+\frac{\mathrm{\λ}}{{\mathrm{\ρ}}_w}}---\left(10\right)$

Substitute into formula (8) again and can try to achieve concrete water consumption Mw.

Example one:

1) according to above-mentioned theory formula, the filling factor alpha of getting coal ash instead fine aggregate sandy soil is 23%, gets P.O42.5 class g cement 285g as calculated by mass per volume, grittiness spoir 1268g, flyash 379g.Add grittiness spoir, flyash is uniformly mixed, and then add cement and be uniformly mixed again, then add the mixing water being mixed with water reducer 6.6g and 252g water, stir in cement mortar mixer;

2) material is put into forming mould, be placed in point two-stage vibration on shaking table shaping, first step dress half material after vibration 2min, it is shaping that the second stage adds leftover materials after vibration 2min again;

3) test specimen after shaping covers plastics film, the demoulding after 24h, and the maintaining box being placed in fixed temperature and humidity carries out maintenance, obtains concrete product one;

Carry out the intensity detection of above cured article one according to " concrete structure engineering construction quality accident specification " (GB50204-2002), concrete product one 28 days test block pressure resistance intensities are 21.8MPa.

Example two:

1) P.O42.5 class g cement 311g is got by mass per volume, grittiness spoir 1240g, flyash 371g.Add grittiness spoir, flyash is uniformly mixed, and then add cement and be uniformly mixed again, then add the mixing water being mixed with water reducer 5.1g and 259g water, stir in cement mortar mixer;

2) material is put into forming mould, be placed in point two-stage vibration on shaking table shaping, first step dress half material after vibration 2min, it is shaping that the second stage adds leftover materials after vibration 2min again;

3) test specimen after shaping covers plastics film, the demoulding after 24h, and the maintaining box being placed in fixed temperature and humidity carries out maintenance, obtains concrete product two;

Carry out the intensity detection of above cured article two according to " concrete structure engineering construction quality accident specification " (GB50204-2002), concrete product 2 28 days test block pressure resistance intensities are 27.7MPa.

Example three:

1) cement 337g is got by mass per volume, grittiness spoir 1211g, flyash 362g, add grittiness spoir, flyash is uniformly mixed, and then add cement and be uniformly mixed again, then add the mixing water being mixed with water reducer 3.5g and 266g water, stir in cement mortar mixer;

2) material is put into forming mould, be placed in point two-stage vibration on shaking table shaping, first step dress half material after vibration 2min, it is shaping that the second stage adds leftover materials after vibration 2min again;

3) test specimen after shaping covers plastics film, the demoulding after 24h, and the maintaining box being placed in fixed temperature and humidity carries out maintenance, obtains concrete product three;

Carry out the intensity detection of above cured article three according to " concrete structure engineering construction quality accident specification " (GB50204-2002), concrete product 3 28 days test block pressure resistance intensities are 18.9MPa.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims (8)

1. the compactness concrete of an adding coal ash and grittiness spoir, it is characterized in that: described concrete raw material comprises cement, grittiness spoir, flyash, water reducer and water, described raw material every cubic metre quality is: cement 285 ~ 337kg, sandy soil 1211 ~ 1268kg, flyash 362 ~ 379kg, water reducer 3.5 ~ 6.6kg, water 252 ~ 266kg.

2. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: described spoir is the grittiness spoir produced after the regulation of two sides, the Changjiang river, and its chemical composition comprises SiO ₂, Al ₂o ₃, Fe ₂o ₃, CaO, MgO, K ₂o, Na ₂o, TiO ₂, SO ₃.

3. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: the particle diameter of described grittiness spoir particle is 0.075 ~ 0.3mm.

4. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: described cement is gelling material, and described flyash is adulterant.

5. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: described cement is ordinary Portland cement.

6. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: described water reducer is lignosulfonic acid sodium form water reducer.

7. the compactness concrete of a kind of adding coal ash according to claim 1 and grittiness spoir, is characterized in that: described material fiting ratio method of design adopts compactness principle to design.

8. the concrete preparation method of the compactness of adding coal ash and grittiness spoir according to any one of claim 1-7, comprises the following steps:

1) in stirrer, first add grittiness spoir according to above-mentioned proportioning, flyash is uniformly mixed, then add cement and be uniformly mixed again;

2) according to above-mentioned proportioning water intaking and water reducer, by both abundant mixing and stirring;

3) by step 2) the obtained aqueous solution containing water reducer slowly adds step 1) stir in obtained mixed material and make mixture;

4) according to forming mould size, take mixture and put into forming mould, put and divide 2 grades of jolt rammings on a vibration table, every grade of vibration 2min;

5) test specimen after shaping is covered plastics film, the demoulding after 24h, be placed in the maintaining box maintenance 28 days of fixed temperature and humidity.