CN1174931C

CN1174931C - Dispersing concrete sweller

Info

Publication number: CN1174931C
Application number: CNB011405376A
Authority: CN
Inventors: 李乃珍; 张晨娥; 张立新; 王铁军; 谢敬坦
Original assignee: 李乃珍
Priority date: 2001-11-10
Filing date: 2001-11-10
Publication date: 2004-11-10
Anticipated expiration: 2021-11-10
Also published as: CN1357505A

Abstract

The present invention provides a dispersible concrete expanding agent which is composed of the following components of the proportion by weight: 20% to 40% of mixing clinker of sulphoaluminate and aluminate, 55% to 75% of anhydrite, 1% to 5% of alunite and 1% to 3% of zeolite or 2% to 6% of aluminous slag from electric power plants. The present invention is characterized in that different aluminate minerals are used for regulating expansion rates, and the zeolite with porous structure or the aluminous slag from the electric power plants is used as a chemical additive carrier so as to obtain the following advantages of good additive dispersivity, good easily obtained working property of concrete, high expansion rate, low alkali content and enhanced concrete intensity. In engineering application, the recommended addition amount of the dispersible concrete expanding agent is 8%. Compared with generally commercial expanding agents, the addition amount is saved by 20% to 30%.

Description

A kind of dispersing concrete sweller

Technical field

The present invention is a kind of dispersing concrete sweller, belongs to technical field of concrete additives.

Background technology

Several cement expansive material patent and products are arranged both at home and abroad, divide, mainly contain sulplo-aluminate type, aluminate type, lime type, alunite type by its essential mineral that contains.Sulplo-aluminate type swelling agent is main content with sulfoaluminate clinker, and hydration rate is fast, short with fixed attention to concrete, early wall losses is bigger for expansion energy; Aluminate type swelling agent is main content with aluminate clinker, makes loss of strength, cost higher; Lime type swelling agent is because of calcining temperature and store the influence that absorbs water, and quality is difficult for stablizing, existing the hidden danger of late expansion and should not be used for waterproofing work; Alunite type swelling agent is close to superseded greatly because of alkali content.Mostly consumption is higher for most swelling agents, and interior volume is general 〉=10%, exist to chemical admixture adaptability relatively poor and cause concrete slump loss comparatively fast, bigger defective, can not adapt to the requirement of modern concrete operating technique well.

Summary of the invention

Task of the present invention is to make a kind of dispersing concrete sweller, be characterized in not only the rate of expansion height, interior volume is little, alkali content is low, and it is good to the chemical admixture suitability, make chemical admixture be easy to disperse and play a role by carrier absorption, thereby obtain good concrete work characteristic.

The present invention is achieved in that it is formed by certain weight ratio, common grinding with aluminate mixing grog, anhydrite, zeolite and four kinds of raw materials of alunite by sulplo-aluminate.The weight ratio of sulfoaluminate clinker and aluminate clinker is 1: 1 in the mixing grog.The weight of each raw material is formed: mix grog 20%～40%, anhydrite 55%～75%, alunite 1%～5%, zeolite 1%～3% or Al ₂O ₃Content is not less than power plant's aluminous slag 2%～6% of 30%.

The chemical reaction mechanism of this swelling agent is the C in the sulfoaluminate clinker ₄A ₃S, the CA in the aluminate clinker, CA ₂, C ₂AS, the KA1 (SO in the alunite ₄) ₂(OH) ₆, the Ca (OH) that five kinds of aluminium mineral materials all produce with hydrated cementitious ₂And the CaSO of swelling agent self ₄Reaction forms ettringite, and the ettringite that forms before concrete hardening only provides intensity, and the ettringite that the sclerosis back forms just provides expansion, and different aluminium mineral materials forms the speed difference of ettringite, and the former the fastest, inferior person is placed in the middle, the latter is the slowest.Therefore, make the adjusted control of speed of expansion, before concrete is unhardened, reduce expansion energy consumption as far as possible, help bringing into play the function that expansion compensation shrinks.Zeolite or aluminous slag have the effect that improves intensity and degree of compactness.What is more important, the screen work shape vesicular structure of zeolite, internal surface area is big, adsorptivity is strong, can be used as the carrier of chemical admixtures such as high efficiency water reducing agent, pumping agent, retardant, admixture is uniformly dispersed in concrete mix, be easy to fast, give full play to the admixture effect; Simultaneously, original moisture content of filling has water retention to concrete in the zeolite pores, does not emanate, bleeding not, can reduce slump-loss, makes concrete have good working performance.Power plant's aluminous slag has higher activity, and Si-rich phase is easy to and Ca (OH) ₂Reaction also can be used as the chemical admixture carrier, the effect that obtains and use zeolite facies to work as.

Advantage of the present invention is tangible:

(1) regulates ettringite with different aluminium mineral materials and form speed, increase effectively and expand, strengthen the tension reinforcing steel bar ability, improve cracking of reinforced concrete.

(2) utilize the constitutional features of zeolite, strengthen the chemical admixture dispersiveness, reduce concrete slump loss, also can avoid the common segregation of concrete, bleeding defective.Workability of concrete can be guaranteed.

(3) alkali content is lower than 0.50%, can avoid alkali-aggregate reaction.

(4) volume is 8% o'clock in this product, presses the standard test of JC476 cement expansive material, and limited expansion rate in 7 sky and water 〉=0.035% be higher than the standard code index, and intensity increases.

(5) this product is quantitatively added in the cement, can obtain expansive cement; Quantitatively add cement and make mortar and can obtain waterproof mortar; Quantitatively add in the concrete, can be compensated shrinkage concrete, non-shrinkage concrete, fill concrete, be used for waterproof, antiseepage, cracking resistance and infilling work.

(6) when mixing the system concrete, this Products Show consumption is 8% of cement and an addition material total amount, but equivalent replaces cement, saves 20%～30% than domestic commercially available most swelling agents.

Embodiment

(1) the manufacturing process starting material are mixed into mill according to a certain ratio through broken, metering, control SO3 and fineness index, and homogenizing, packing are carried out factory inspection.

(2) starting material Chemical Composition such as table 1 are listed, and it is listed as table 2 to fill a prescription, and the main chemical such as the table 3 of product are listed, and interior volume is that 8% o'clock standard test physicals such as table 4 is listed.

This product is called for short FEA, and F represents dispersed, and EA is domestic habitual swelling agent appellation.The grinding fineness of FEA embodiment is represented with specific surface area, is 250m ²/ kg～300m ²/ kg.

Starting material Chemical Composition (%) table 1

Title	SiO ₂	Al ₂O ₃	Fe ₂O ₃	TiO ₂	CaO	MgO	R ₂O	SO ₃
Title	SiO ₂	Al ₂O ₃	Fe ₂O ₃	TiO ₂	CaO	MgO	R ₂O	SO ₃	Sulfoaluminate clinker	10.21	32.83	1.88	0.94	42.84	1.58	0.05	8.80
Aluminate clinker	6.01	54.15	2.73	2.36	33.66	0.80	0.18		Sulfoaluminate clinker	10.21	32.83	1.88	0.94	42.84	1.58	0.05	8.80
Aluminate clinker	6.01	54.15	2.73	2.36	33.66	0.80	0.18		Mix grog	8.11	43.49	2.30	1.65	38.25	1.19	0.12	4.40
Anhydrite	1.48				38.69	1.43		51.20	Mix grog	8.11	43.49	2.30	1.65	38.25	1.19	0.12	4.40
Anhydrite	1.48				38.69	1.43		51.20	Alunite	54.95	14.23	1.69		0.65	0.15	3.51	13.70
Zeolite	67.86	11.03	1.20		4.72	0.73	1.75		Alunite	54.95	14.23	1.69		0.65	0.15	3.51	13.70
Zeolite	67.86	11.03	1.20		4.72	0.73	1.75		Power plant's aluminous slag	55.56	33.48	5.66		3.03	2.36	0.86

FEA Example formulations (%) table 2

Material name	A	B	C	D
Material name	A	B	C	D	Mix grog	20	30	30	40
Anhydrite	75	65	60	55	Mix grog	20	30	30	40
Anhydrite	75	65	60	55	Alunite	1	3	5	3
Zeolite		2		2	Alunite	1	3	5	3
Zeolite		2		2	Power plant's aluminous slag	4		5
Add up to	100	100	100	100	Power plant's aluminous slag	4		5

FEA embodiment main chemical (%) table 3

Embodiment	Al ₂O ₃	SO ₃	CaO	R ₂O
Embodiment	Al ₂O ₃	SO ₃	CaO	R ₂O	A	10.48	39.50	36.39	0.16
B	13.90	35.11	36.21	0.25	A	10.48	39.50	36.39	0.16
B	13.90	35.11	36.21	0.25	C	15.13	34.35	34.38	0.28
D	17.85	35.87	36.10	0.27	C	15.13	34.35	34.38	0.28

FEA embodiment standard test Main physical performance table 4

Item is not		Standard	A	B	C	D
Item is not		Standard	A	B	C	D	Limited expansion rate, %	In the water 7 days, 〉=	0.025	0.058	0.46	0.046	0.041
In the water 28 days ,≤	0.10	0.081	0.62	0.063	0.070			In the water 7 days, 〉=	0.025	0.058	0.46	0.046	0.041
In the water 28 days ,≤	0.10	0.081	0.62	0.063	0.070	In the air 28 days, 〉=		-0.020	0.014	0.003	0.008	-0.012
Ultimate compression strength, MPa	7 days, 〉=	25.0	29.6	45.3	43.0	In the air 28 days, 〉=		-0.020	0.014	0.003	0.008	-0.012	42.4
	7 days, 〉=	25.0	29.6	45.3	43.0	28 days, 〉=	45.0	51.3	68.7	59.0	60.1		42.4
	Folding strength, MPa	7 days, 〉=	4.5	6.8	7.2	28 days, 〉=	45.0	51.3	68.7	59.0	60.1	7.1	6.9
28 days, 〉=		7 days, 〉=	4.5	6.8	7.2	6.5	8.2	9.8	8.5	8.8		7.1	6.9

Claims

1, a kind of dispersing concrete sweller, it is characterized in that its weight composition is: sulplo-aluminate and aluminate mixing grog 20%～40%, anhydrite 55%～75%, alunite 1%～5%, and 1%～3% zeolite or 2%～6% plant slag are arranged, the Al in the plant slag ₂O ₃Content is not less than 30%, and the weight ratio of sulplo-aluminate and aluminate is 1: 1 in the above-mentioned mixing grog.