CN1098227C

CN1098227C - Multifunctional water-proofing agent for concrete

Info

Publication number: CN1098227C
Application number: CN00110107A
Authority: CN
Inventors: 韩永谦; 叶明�
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-15
Filing date: 2000-02-15
Publication date: 2003-01-08
Anticipated expiration: 2020-02-15
Also published as: CN1309104A

Abstract

The present invention discloses a multifunctional waterproof agent for concrete, which is used for building materials. The multifunctional waterproof agent for concrete comprises the components of the following proportion: 20 to 35 wt% of organic silicon, 0 to 20 wt% of water reducing agents, 5 to 15 wt% of sodium lignosulfonate or calcium lignosulfonate, 0.5 to 1.5 wt% of citric acid, 3 to 10 wt% of aluminum sulfate or aluminum nitrate and 45 to 60 wt% of water. The multifunctional waterproof agent for concrete integrates high efficient water prevention, water reduction and pumping and is a multifunctional liquid waterproof agent with a slight expansion function; therefore, the present invention can satisfy construction technology requirements for pumping waterproof concrete in a big flow state.

Description

Multifunctional water-proofing agent for concrete

What the present invention relates to use on a kind of building materials contains the water-resisting agent that organic and inorganic materials combine.

Along with the development of Building Trade in China, Highrise buildings and underground civil air defense constructions and installations increase year by year.Because the maximization of engineering structure, complicated and concrete production and operating technique have proposed more technical requirements day by day to mechanize, modernization and commercialization development for the rigidity water-proofing material that mixes in the concrete.

Though the water-resisting agent of construction market application at present is of a great variety, the main branch: two kinds of pulvis and liquid waterproof agents.Pulvis water-resisting agent and swelling agent etc. mix and mainly play the anti-cracking waterproof effect in the concrete, if adopt the pumping construction concrete then must be compound other admixture, could satisfy construction technical requirement as pumping agent, water reducer etc.The multifunctional water-proofing agent for concrete of present domestic appearance, building the multifunctional water-proofing agent of grinding institute's development as Chinese building material institute and China all is that pulvis water-resisting agent and its incorporation are higher, 8～12% of about by mass of cement.Must establish in commerical ready-mixed concrete that the special messenger feeds intake and dust is big, labour intensity is high, easily because of measuring the inaccurate accident resulting from poor quality of projects that causes.

The liquid repellent agent of domestic application mainly contains Indian red class water-resisting agent, fatty acid and inorganic aluminate class water-resisting agent etc.Incorporation is about 2～3%.They mix and mainly play the water proof anti-seepage effect in the concrete, do not have effects such as pumping, expansion, and the concrete pumping construction must be added with admixtures such as pumping agent or water reducer.Only have the water-resisting agent of single water-proof function and the needs that swelling agent can not satisfy development of the situation obviously.

Through international online retrieval, finding the relevant cement that contains silicone ingredients is alkyl, alkoxyorganosilane, and fontanel have machine silane, organic second vinegar base silane etc.Relevant multifunctional water-proofing agent (JP09-303316) includes the crosslinked non-cationic both sexes of alkali acryl styrene polymer water-resisting agent, buck agent and water-holding agent; (publication number is: CN1161312) " novel high-efficiency water-proof agent " (CN1194290) for Chinese patent disclosed " a kind of mortar and concrete water-resisting agent ".Mainly acting on by its contained proximate analysis is water proof anti-seepage.

The objective of the invention is to overcome the deficiency of above-mentioned water-resisting agent, provide a kind of and collect high-effective water-proof, diminishing, be pumped to one and have that microdilatancy is multi-functional, the liquid repellent agent of low-dosage.

For realizing purpose of the present invention, this water-resisting agent: the component that contains is (by weight percentage):

Organosilicon 20～35%;

Liquid agent 0～20%;

Sodium lignosulfonate or calcium lignin sulphonate 5～15%;

Citric acid 0.5～1.5%;

Tai-Ace S 150 or aluminum nitrate 3～10%;

Water 45～60%.

Described organosilicon is a methyl silicon sodium alcoholate, and liquid agent is a naphthalenesulfonate formaldehyde condensation compound.

Each component and effect thereof

Its water repellent component is: methyl silanol is received, and it is the important component of multifunctional water-proofing agent.Mix water repellent component, by synthetic be reflected at that concrete can form many colloids and binding substances is filled in the concrete, stopped up the capillary-size pore in the concrete, reduced the thin rate in hole, improved concrete degree of compactness and impermeabilisation ability.

The diminishing component is: sodium lignosulfonate or calcium lignin sulphonate.Improve concrete intensity and impermeability greatly thereby it can reduce concrete water cement ratio significantly, reduce porosity, increase concrete density.

Fluidized composition is: it is a kind of surfactant for a naphthalenesulfonate formaldehyde condensation compound, and its effect is fully to disperse cement, and the moisture release of cement group parcel is come.Under the condition that does not increase concrete water-cement ratio, can increase the concrete slump significantly, thereby guarantee neither to influence the requirement that concrete intensity can satisfy the concrete pumping construction again.

The slow setting guarantor moulds component and is: citric acid; Can suitably prolong concrete first, final setting time, reduce concrete slump-loss, satisfy the concrete pumping construction requirement and do not influence the early stage and later strength development of concrete.

Expansion component is: Tai-Ace S 150 or aluminum nitrate.It mainly expands with the contraction of part compensating concrete by the trace that compound produced with hydrated cementitious product reaction generation, the deduction and exemption cracking.

The present invention compared with prior art beneficial effect is as follows:

A, this multifunctional water-proofing agent for concrete be collection high-effective water-proof, diminishing, be pumped to one and have a multi-functional liquid repellent agent of microdilatancy.Its incorporation low (by mass of cement 2%), it can satisfy the pumping construction technical requirements of big fluidised form water-proof concrete.Behind the water-resisting agent that commerical ready-mixed concrete mixes, can play waterproof action does not need admixtures such as admixture pumping agent, water reducer just can satisfy concrete guarantor again to mould and the pumping requirement.Use very convenient.The key technical indexes is: density: 1.20g/ml-1.25g/ml; Solid content: 40-50%; Water-reducing rate: 14-20%; Flowing degree of net paste of cement: 210～240mm; Amount of air entrainment :≤4.0%; Chloride ion content: do not have.

B, this multifunctional water-proofing agent not scene of being only applicable to are mixed the water-proof concrete of system but also are highly suitable for the commerical ready-mixed concrete pumping construction.So detect on content and the experimental technique mainly with reference to JC474-92 " mortar, concrete waterproofer " and JC473-92 " concrete pump-feed agent " and three national standards of JC476-98 " cement expansive material " in concrete experiments, detect through Liaoning Province's construction quality inspection center and Shenyang City's construction engineering quality inspection side center, its main project detected result is as follows:

Table 1 JC474-92

Project		Index			Detected result
Project		Index						Acceptable end product		Salable product
Water-reducing rate %								Acceptable end product		Salable product	17.3
Water-reducing rate %					Compressive strength rate, % is not more than	3d				140	17.3
7d	110		100	143		3d				140
7d	110		100	143		28d	100		95	134
	90d	100		90		28d	100		95	134	110
	90d	100		90	The permeated height ratio, % is not less than		30		40	27	110
Ultimate compression strength rate of loss ratio is not more than			100	100	The permeated height ratio, % is not less than		30		40	27	38
			100	100	Mass loss rate is not more than			100	100	69	38

Table 2 JC473-92

Project		Index		Detected result
Project		Index					Acceptable end product	Salable product
Slump retention value cm	30min	12	10				Acceptable end product	Salable product	16
	30min	12	10	60min	10	8	12		16
	Slump increased value, Cm is not less than		10	60min	10	8	12	8	12

Table 3 JC476-1998

Project			Index	Detected result
Project			Index	Detected result	Limited expansion rate %	In the water	7d≥	0.025	0.036
28d≤	-0.10	0.05					7d≥	0.025	0.036
28d≤	-0.10	0.05	In the air	28d≥			-0.020

Above-mentioned test-results shows: this water-resisting agent is all obtained good effect through the application of one-year age, its every technical performance index all satisfies the building material industry standard JC474-92 of the People's Republic of China (PRC), JC473-92, the requirement of JC476-98, it can be widely used in having the concrete works of water proof anti-seepage requirement, and water-proof concrete not only can adopt the pumping construction of the water-proof concrete of the on-the-spot high flowability that stirs but also be applied to prepare C10-C50.It has that water resistance is good, water-reducing rate is big, volume is low, microdilatancy, guarantor mould the time long, pumpability is good and characteristics such as easy to use.For adapting to market from now on, satisfy engineering demand and split a new road, be a kind of new concrete water-resisting agent of high-efficiency multi-function.

Embodiment to the present invention program describes in further detail below:

Embodiment 1

With raw material methyl silicon sodium alcoholate 25%; Naphthalenesulfonate formaldehyde condensation compound 10%; Sodium lignosulfonate 8%; Citric acid 1%; Tai-Ace S 150 5%; Water 51% is put into reaction kettle for reaction, in temperature is: 100～140 ℃; Under the condition of operating pressure 1～2, the reaction times will obtain this water-resisting agent after being 3-4 hour.

Embodiment 2:

With raw material methyl silicon sodium alcoholate 25%; Naphthalenesulfonate formaldehyde condensation compound 10%; Calcium lignin sulphonate 10%; Citric acid 0.5%; Aluminum nitrate 5%; Water 49.5% is put into reaction kettle for reaction, in temperature is: 100～140 ℃; Under the condition of operating pressure 1～2, the reaction times will obtain this water-resisting agent after being 3-4 hour.

Claims

1, a kind of multifunctional water-proofing agent for concrete is characterized in that: the component that contains is (by weight percentage):

Organosilicon 20～35%;

Liquid agent 0～20%;

Sodium lignosulfonate or calcium lignin sulphonate 5～15%;

Citric acid 0.5～1.5%;

Tai-Ace S 150 or aluminum nitrate 3～10%;

Water 45～60%;

Its described organosilicon is a methyl silicon sodium alcoholate, and liquid agent is a naphthalenesulfonate formaldehyde condensation compound.