CN1443727A - High-strength light concrete and its production method - Google Patents

Abstract

The present invention relates to a high-strength light concrete, its composition includes (wt%): compound cementing material which is 20-70% of total weight of raw material, water which is 15-30% of compound cementing material weight, fine sand which is 0-50% of total weight of raw material, light aggregate which is 0-40% of total weight of raw material, fiber which is 0.5-2% of total weight of raw material, foaming agent is 0.1-3% of compound cementing material weight, water-reducing agent which is 0.2-2.5% of compound cementing material weight and caustic alkali which is 0-3% of compound cementing material weight. It is superior to aerocrete and general concrete is all the technical indexes.

Description

A kind of high strength light concrete and manufacture method thereof

Technical field

The present invention relates to a kind of concrete and manufacture method thereof, particularly a kind of high strength light concrete and manufacturing manufacture method thereof.

Background technology

Concrete is that construction industry is used maximum material of construction, and along with expanding economy and development of technology, people also improve constantly the requirement of material of construction, not only require high strength, durable, but also want lightweight, insulation, sound insulation, environmental protection.Use maximum normal concretes at present in industry and covil construction, though intensity (being generally 20-30MPa) can satisfy the requirement of building structure substantially, relatively heavier, sound-insulating character is relatively poor.

A kind of gas concrete is arranged in the market, and weight is lighter, and insulation, sound-proofing properties is also relatively good, but its intensity very low (general＜as 5MPa), can't to satisfy the requirement of building structure, can only do nonweight-bearing partition wall or lagging material.In addition, gas concrete is highly brittle, and is easy in transportation and construction process broken.

Normal concrete and gas concrete all belong to hard brittle material, is easy to because of contraction produces microfracture, even completely destroy.

Summary of the invention

The present invention is to provide a kind of high strength light concrete and manufacture method thereof.

Technical scheme of the present invention is: a kind of high strength light concrete, be made up of components such as composite cementitious materials, fine sand, water, light skeletal, fiber, pore forming material, water reducer and auxiliary agents, the proportioning of each feed composition (by weight percentage) is as follows: composite cementitious materials accounts for 20～70% of raw material gross weight; Water accounts for 15～30% of composite cementitious materials weight; Fine sand accounts for 0～50% of raw material gross weight; Light skeletal accounts for 0～40% of raw material gross weight; Fiber accounts for 0.5～2% of raw material gross weight; Pore forming material accounts for 0.1～3% of composite cementitious materials weight; Water reducer accounts for 0.2～2.5% of composite cementitious materials weight; Caustic alkali accounts for 0～3% of composite cementitious materials weight.

Composite cementitious materials is made up of flyash, water-granulated slag, cement, lime and silicon ash, the proportioning of its component (by weight percentage) is as follows: flyash 0～60%, water-granulated slag 0～40%, cement 10～50%, lime 10～50%, 5～20% of silicon ash by mass of cement.

Fine sand is quartzy fine sand or float stone fine sand, and its particle diameter is 0.1～1mm;

Light skeletal is clay haydite, float stone, polyethylene foams, castor-oil plant bar straw or wood chip, and its particle diameter is 1～5mm;

Fiber is polypropylene fibre, glass fibre or vegetable fibre;

Pore forming material is aluminium powder, magnesium powder, zinc powder, hydrogen peroxide or rosined soap;

Water reducer is NF, FDN, UNF-2, AF, S or MF type high efficiency water reducing agent;

Auxiliary agent is a caustic alkali.

A kind of manufacture method of high strength light concrete is as follows:

By proportioning with following raw material: uniform mixing after composite cementitious materials, fine sand, water, light skeletal, fiber, pore forming material, water reducer and auxiliary agent etc. cooperate, pour in the mould, to reach 20～60% (according to the effects of getting angry of pore forming material) of mold volumes amount, it is tight that mould is built envelope, treat that whipping agent produces bubble mix is expanded, be full of mould, left standstill 1 hour, by the time to solidify and reach after the form removal intensity be collapsible die to mix, use 60～80 ℃ of vapor cures 1～16 hour or natural curing 7～28 days then, reach design strength up to material.The waiting time is shortened in form removal as early as possible if desired, can be in 60 ℃ of heating down, form removal after 3 hours.When if desired concrete being processed into the building block of various size or sheet material, can be after form removal, with sawing or steel wire carries out cutting processing, and then carry out maintenance before vapor cure or the natural curing; Improve concrete tension and folding strength if desired, can be before the raw material that mixes and stirs be poured in the mould, for example higher material of tensile strength such as nylon fiber net of reinforcing bar, woven wire or other is put in the shop in mould.

The present invention is owing to adopt above technical scheme, and therefore proportion, the thermal insulation of high strength light concrete provided by the invention are suitable with existing gas concrete, and every indexs such as ultimate compression strength, cleavage strength and sound insulation are all than gas concrete height; Its ultimate compression strength and normal concrete are suitable, and every indexs such as cleavage strength, thermal insulation and sound insulation are all than normal concrete height, but proportion is more much lower than normal concrete; Its cleavage strength is all higher than gas concrete, normal concrete, and at carrying and when construction cracky not.Therefore, high strength light concrete has the lightweight of gas concrete and the high-intensity advantage of normal concrete concurrently.Concrete technical indicator is as shown in table 1.

Table 1: high strength light concrete and gas concrete and normal concrete salient features are relatively

	High strength light concrete	Gas concrete	Normal concrete
				Ultimate compression strength (Mpa)	????15～30	??＜5	??20～30
Cleavage strength (Mpa)	????3～6	??＜0.5	??2～3
				Unit weight (kg/m3)	????400～800	??600～1200	??2350～2400
Thermal insulation1(R)	????15～20	??15～20	??＜5
				Sound insulation (dB)	????40～50	??20～40	??＜20

Measure according to U.S. touchstone ASTM C236,

The load larrying member that high strength light concrete provided by the invention not only can be used to build, and can be used for sheet material, hollow building block or materials for wall.

Specific embodiment

Embodiment 1:

Get composite cementitious materials (containing flyash 36%, water-granulated slag 20%, cement 20%, lime 20%, silicon ash 4%) 50%; Water 11%; Float stone fine sand 25.7%; Polyethylene foams 10%; Polypropylene fibre 0.5%; Gum rosin 1%; NF water reducer 0.8%; Caustic alkali 1% mixes in proportion, and pours into

The cylinder type mould, reach the mold volumes amount 50% till.Pore forming material produces bubble expands concrete, is full of mould.Left standstill concrete setting, form removal after 6 hours, 80 ℃ of vapor cure 16 hours 1 hour.

Product index reaches: ultimate compression strength 18MPa, cleavage strength 3.8MPa, unit weight 550kg/m³

Embodiment 2:

Get composite cementitious materials (containing flyash 0%, water-granulated slag 40%, cement 40%, lime 15%, silicon ash 5%) 30%; Water 5.4%; Float stone fine sand 22.5%: haydite 40%; Polypropylene fibre 1%; Aluminium powder 0.2%; UNF-2 water reducer 0.6%; Caustic alkali 0.3% mixes in proportion, and pours intoThe cylinder type mould, reach the mold volumes amount 40% till.Pore forming material produces bubble expands concrete, is full of mould.Left standstill 1 hour, concrete setting is heated 60 ℃, form removal after 3 hours, natural curing 28 days.

Product index reaches: ultimate compression strength 35MPa, cleavage strength 5.3MPa, unit weight 1100kg/m³

Embodiment 3:

Get composite cementitious materials (containing flyash 58%, water-granulated slag 0%, cement 20%, lime 20%, silicon ash 2%) 60%; Water 16.8%; Castor-oil plant bar straw 20%; Polypropylene fibre 0.8%; Hydrogen peroxide 0.6%; AF water reducer 0.3%; Caustic alkali 1.5% mixes in proportion, and pours intoThe cylinder type mould, reach the mold volumes amount 40% till.Pore forming material produces bubble expands concrete, is full of mould.Leave standstill concrete setting in 1 hour, heat 60 ℃, form removal after 3 hours, natural curing 28 days.

Product index reaches: ultimate compression strength 25MPa, cleavage strength 4.5MPa, unit weight 810kg/m³

Embodiment 4:

Get composite cementitious materials (containing flyash 20%, water-granulated slag 0%, cement 40%, lime 32%, silicon ash 8%) 40%; Water 8%; Quartzy fine sand 48.1%; Polypropylene fibre 1.8%; Rosined soap 1.2%; S water reducer 0.7%; O.2%, caustic alkali mixes in proportion, and pours into

The cylinder type mould, reach the mold volumes amount 50% till.Pore forming material produces bubble expands concrete, is full of mould.Left standstill concrete setting, form removal after 8 hours, 80 ℃ of vapor cure 1 day 1 hour.

Product index reaches: ultimate compression strength 25MPa, cleavage strength 4.5MPa, unit weight 625kg/m³

Embodiment 5:

Get composite cementitious materials (flyash 25%, water-granulated slag 20%, cement 40%, lime 10%, silicon ash 5%) 50%; Water 13%; Quartzy fine sand 33.3%; Polypropylene fibre 1%; Rosined soap 1.5%; MF water reducer 0.4%; Caustic alkali 0.8% mixes in proportion, and pours intoThe cylinder type mould, reach the mold volumes amount 30% till.Pore forming material produces bubble expands concrete, is full of mould.Left standstill concrete setting, form removal after 8 hours, 80 ℃ of vapor cure 1 day 1 hour.Product index reaches: ultimate compression strength 20MPa, cleavage strength 4.0MPa, unit weight 625kg/m³

Claims (10)

1, a kind of high strength light concrete is characterized in that described high strength light concrete is made up of components such as composite cementitious materials, fine sand, water, light skeletal, fiber, pore forming material, water reducer and auxiliary agent caustic alkalis.

2, a kind of high strength light concrete as claimed in claim 1, it is characterized in that the proportioning (by weight percentage) of described high strength light concrete component is as follows: composite cementitious materials accounts for 20～70% of raw material gross weight; Water accounts for 15～30% of composite cementitious materials weight; Fine sand accounts for 0～50 of raw material gross weight; Light skeletal accounts for 0～40 of raw material gross weight; Fiber accounts for 0.5～2 of raw material gross weight; Pore forming material accounts for 0.1～3% of composite cementitious materials weight; Water reducer accounts for 0.2～2.5% of composite cementitious materials weight; Caustic alkali accounts for 0～3% of composite cementitious materials weight.

3, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described composite cementitious materials is made up of flyash (by weight percentage) 0～60%, water-granulated slag 0～40%, cement 10～50%, lime 10～50% and silicon ash (by mass of cement) 5～20%.

4, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described fine sand is quartzy fine sand or float stone fine sand, and particle diameter is 0.1～1mm.

5, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described light skeletal is clay haydite or float stone or polyethylene foams or castor-oil plant bar straw or wood chip, and its particle diameter is 1～5mm.

6, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described fiber is polypropylene fibre or glass fibre or vegetable fibre.

7, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described pore forming material is aluminium powder or magnesium powder or zinc powder or hydrogen peroxide or rosined soap.

8, a kind of high strength light concrete as claimed in claim 1 or 2 is characterized in that described water reducer is NF type or FDN type or UNF-2 type or AF type or S type or MF type high efficiency water reducing agent.

9, a kind of manufacture method of high strength light concrete is as follows:

Composite cementitious materials, fine sand, water, light skeletal, fiber, pore forming material, water reducer and auxiliary agent caustic alkali are cooperated uniform mixing afterwards by proportioning, pour in the mould; Also can be earlier in mould the shop put the higher material of reinforcing bar, woven wire or other tensile strength and then pour in the mould; And with reach the mold volumes amount 20～60% till, it is tight that mould is built envelope, treats that whipping agent produces bubble mix is expanded, and is full of mould, left standstill 1 hour, by the time after 6～8 hours mix to solidify and reach after the form removal intensity be collapsible die, carry out maintenance then.

10, the manufacture method of a kind of high strength light concrete as claimed in claim 9 is characterized in that described maintenance process for 80 ℃ of vapor cures 1～16 day or natural curing 28 days, reaches design strength up to material; Or in 60 ℃ of heating down, form removal after 3 hours; Or after form removal, concrete cutting is processed into the building block or the sheet material of various size, carry out vapor cure or natural curing again.