CN1168685C - Improved processing additives for hydraulic cements - Google Patents

Abstract

This invention relates to enhancing the compressive strength of cements after 1, 3, 7 and 28 days following hydration and to improving porosity and finished surfaces of the hardened cements and concretes made therefrom. The improved cements are prepared using certain hydroxylamine additives in amounts of up to 0.1 % which preferably are added during grinding of the cement in which case the amines further act as grinding aids.

Description

Hydraulic cement composition

The present invention relates to the improvement on intensity, porosity and the final surface of portland cement and blended cement composition.Specifically, relate to a kind of to hydraulic cement composition that wherein adds admixture such as portland cement, this admixture can grind altogether with cement clinker and improve mill efficiency, or before adding entry or with water, mix mutually with powdered cement together, it has improved hydraulic cement and the composition made by these cement such as intensity, porosity and the final surface of portland cement concrete.

Term cement is appointed as many kinds of materials as binding agent and tackiness agent.Hydraulic cement is a powder material, when it mixes with water, forms " slip " of slow hardening, if when further mixing with sand, it forms " mortar ", and if mix with sand and coarse aggregate such as rock, form the same hard product with rock " concrete ".These products are commonly referred to the hydraulic cement mixture.The component of portland cement by its composition specific criteria different and that formulated by each country is (referring to Cement Standards of theworld, Cembureau, Paris, Fr.) be different from other cement, for example, in the U.S., ASTM (American society for testing materials) (ASTM), American National highway and transportation association and other government organs established a kind of based on grog main chemical constitution and the cement primary standard of the Main physical performance of final cement admixture.For the present invention, term " portland cement " refers to comprise all gelling composition that satisfy ASTM requirement (being specified by ASTM standard C 150) or satisfy the standard of other country's formulation.

The mixture that comprises lime carbonate (Wingdale), pure aluminium silicate (as clay or shale), silicon-dioxide (as sand) and mix ferric oxide by the sintering component prepares portland cement.In sintering process, chemical reaction takes place, wherein form the hardened spherolite, be referred to as grog usually.Calcium oxide and acidic components reaction form the wustite solid solution phase that portland cement clinker mainly produces tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate and is made up of at least 4% tetracalcium aluminoferrite basically.

After the grog cooling, then in clinker grinding mill with its with a spot of gypsum (calcium sulfate) thus together grinding provides a kind of thin, uniform powdery finished product, be referred to as portland cement.Because grog is extremely hard, needs lot of energy that it is ground to form suitable powder-form.According to the character of grog, grog grinds the energy that needs can approximately changed between 33-77kW hour/ton.Shown that different materials such as ethylene glycol, alkanolamine, Ammoniom-Acetate, aromatic series acetate or the like can reduce the energy of needs, therefore improved the mill efficiency of grog.These materials are grinding aid usually, thereby are to introduce in the ball mill and with grog with low dose to grind the processing that obtains even pulverulent mixture.Except reducing to grind the energy, general treatment agent listed above usually can improve the easy fluidity of powder and can reduce agglomerating trend in storage process.

Need fixed to form and physical condition because form suitable portland cement clinker, grog becomes relatively costly starting material.Use for certain, can be with the fuel ash of cheap filler such as Wingdale or grog surrogate such as granulated blast furnace slag, natural or synthetical volcanic ash, grinding or the like instead of part grog.Term filler used herein refers to later strength is increased the inert material that does not have contribution; Term " grog surrogate " refers to help the material that long-term pressure increases after 28 days.Can be restricted in practice thereby add these fillers or grog surrogate formation " mixed cement ", because these additives cause the physical strength of resulting cement to reduce usually.For example, when filler such as Wingdale when mixing greater than 5% quantity, resulting cement is in intensity, particularly the intensity that obtains after the wet curing of 28 Tianchaos (28 days intensity) significantly reduces.Term used herein " mixed cement " refers to comprise 2-90%, and more conventional is the filler of 5-60% or the hydraulic cement composition of grog surrogate.

Can add various other admixtures and change the physical property of final cement in the cement.For example, thought that alkanolamine such as monoethanolamine, diethanolamine, trolamine or the like reduce time of coagulation (accelerating chemicals) and 1 day pressure of refinforced cement (early strength).Yet these admixtures almost do not have useful effect to 28 days setting strengths of final cement, in fact may reduce intensity in some cases.At " ConcreteAdmixtures ", Van Reinhold, New York has described this characteristics by V.Dodson in 1990, and its most known accelerating chemicals of statement and hardening accelerator calcium chloride have reduced pressure in the later stage.

U.S. Patent number 4990190,5017234 and 5084103, (introducing its disclosed content here as a reference), some senior trihydroxy-alkylamine such as tri-isopropanolamine (being referred to as " TIPA " hereinafter) and N have been described, two (2-the hydroxyethyl)-2-hydroxypropyl amine (being referred to as " DEIPA " hereinafter) of N-will improve portland cement, particularly contain the later strength of the portland cement of 4%C4AF (intensity of preparation wet cement mixture after 7 days and 28 days) at least.The senior trihydroxy-alkylamine admixture of describing in these patents of gaining in strength it is said particularly useful in mixed cement.

Though TIPA can improve the later strength of cement composition, it can not improve early strength, can not improve the performance of condensing.More surprising discovery is the amount of air entrainment that it can increase cement.For the early strength that improves the cement composition that condenses that comprises TIPA, the performance of condensing and bleed performance, people such as Myers have proposed to mix known hardening accelerator and accelerating chemicals such as trolamine or an alkali metal salt and known defoamer (ADA) those materials as enumerating in the United States Patent (USP) 5156679.

Can reduce air content though in containing the cement composition of TIPA, mix ADA,, they can not reduce or eliminate the formation and the release of bubble in the cement composition.If place inadequately and aftertreatment, the generation of this incident has a large amount of pores and relatively poor final surface in the time of can causing cement composition to solidify.

Now the utmost point needs a kind of additive, and it can improve condense performance and the intensity that improves each length of time simultaneously, and can not introduce a large amount of bubbles.This is desirable, because it can cause cement composition such as portland cement concrete to have lower porosity and final preferably surface.

On the one hand, the present invention relates to a kind of discovery, be a kind of N of being selected from, two (2-hydroxyethyl)-2-Propanolamines (" DEIPA ") of N-and N, the azanol of two (2-hydroxypropyl)-N-(hydroxyethyl) amine (" EDIPA ") of N-also significantly strengthens early strength (1 day and 3 days) surprisingly except make later strength (7 days and 28 days) enhancing in common aquation and mixing water hydraulic cement.Surprising discovery also is that DEIPA and EDIPA can introduce less air and form less bubble and foam in cement composition than in containing the cement of TIPA.Also having another surprising discovery is that these amine can make cement have minimizing and less porosity and finally surperficial preferably than the cement that contains TIPA.These new additives can join in the cement itself simply or add the trend that improves the mobile of mill efficiency and/or levigate grog and reduce cement formation agglomerate in storage process in the cement clinker process of lapping of routine.

Consistent with the present invention, a kind of hydraulic cement composition of being made up of hydraulic cement and optional fine aggregate and/or coarse aggregate is provided, when it mixes with the admixture that comprises " DEIPA " or " EDIPA ", produce a kind of hydraulic cement composition, it has 1,3,7 and 28 days ultimate compression strength of enhanced and other physicals above-mentioned.

The present invention also provides the preparation method of a kind of hydraulic cement of gaining in strength or mixing water hydraulic cement (it has other desirable performance), method comprises grog, the mixture of gypsum and 2%-80% (weight) filler or grog surrogate grinds altogether with the admixture as grinding aid, thereby improved the easy fluidity of cement behind the grinding, reduced cement agglomerating trend in storage process, and strengthened 1,3,7 and 28 days intensity, and other desirable performance above-mentioned, said admixture contains " DEIPA ", " EDIPA " or its mixture.

The present invention relates to mix with water and cement composition is solidified after have early stage (promptly 1 and 3 day) of increase and the hydraulic cement composition of later stage (promptly 7 and 28 days) ultimate compression strength.It has also improved other desirable performance discussed above.

People it is generally acknowledged that chemical both can increase early strength and also can increase later strength, but can not improve the intensity in all length of times.For example, in above-mentioned " the Concrete Admixture " that quotes as proof, Dodson points out that calcium chloride and trolamine (TEA) can increase early strength and still can not strengthen later strength.People such as Myers has used for example TIPA of senior trihydroxy-alkylamine in U.S. Patent number 4990190,5017234 and 5084103.According to aforementioned patent, it discloses TIPA and other senior trihydroxy-alkylamine, N, and two (2-the hydroxyethyl)-2-Propanolamines (" DEIPA ") of N-and three (2 hydroxybutyl) amine can improve the ultimate compression strength of 7 days and 28 days, still can not improve early strength.The development that improves later strength and increase bleed is all owing to the existence of a large amount of hydroxypropyl groups, and this group causes absorption to reduce, and is as at " J.Am.Ceram.Soc. " 76 (6), illustrational like that by people such as Gartner among the 1521-30 (1993).Also cause for the existence that increases needed these a large amount of hydrophobic groupings of later strength and to have higher amount of air entrainment in the cement composition.People know that hydrophobic grouping and hydrophilic radical or hydrophil lipophil balance (HLB) can change surface-active variation in the document of tensio-active agent, as at " Surface Active Chemical ", among the Pergamon Press (1972) Garrett H.E. statement like that.Therefore, the development of later strength always is considered to increase inseparable with bleed.Surprising in the present invention discovery is two kinds of special senior trihydroxy-alkylamines, and it can improve early strength and later strength, reduces the porosity of bleed and reduction cement composition.

The admixture of gaining in strength is incorporated into these early strong hydraulic cement compositions of preparation in suitable hydraulic cement or the cement composition.The admixture that early strength increases is N, two (2-hydroxyethyl)-2-Propanolamines (" DEIPA ") of N-or N, two (2-hydroxypropyl)-N-(hydroxyethyl) amine (" EDIPA ") of N-.DEIPA only was considered to improve the later strength (intensity after 7 days) of hydraulic cement in the past, and the condense effect on performance, early strength, aerating, porosity and final surface of its improvement is surprising.The quantity that adds DEIPA of the present invention in the cement and EDIPA admixture is about 0.2% for being no more than, preferably be no more than 0.1%, be more preferably less than 0.05% and most preferably be 0.001-0.03% (based on cement weight).Admixture can be a respective pure form or with in it and form such as water-soluble an alkali metal salt for example carbonate, muriate, formate, acetate, silicate, gluconate, vitriol, nitrate, nitrite, phenolate and composition thereof and oxyhydroxide or the like, also can be said azanol and molecular weight be the mixture of polyoxytrimethylene-ethylene oxide segmented copolymer of at least 2500, and at least a mixture that also can comprise azanol, trolamine and triisopropylamine.And admixture can change the form (organic acid for example, the ester of preferred lower acid is as acetic ester) of ester into, because the high pH value of hydraulic cement, it will pass through hydrolysis and revert to alcohol.

A special advantage of admixture of the present invention is that it can be with cement attrition or mixed mutually.Just as used herein, term " attrition " and " mixing mutually " are pointed to the particular stage in the cement processing that wherein adds DEIPA or EDIPA.Can add them in the stage at ripe mill, so attrition helps to reduce the energy of needs and uniform free-pouring finished ground cement is provided, it reduces the trend of caking in storage process.When having influence on the cement hydraulicity and solidify, also can be before adding entry, with water or add this admixture that in finished ground cement, adds after the entry as outer permeation.And admixture of the present invention can be with pure conc forms, or use the dilution back in water or organic solvent, it also can be mixed together use with other chemical admixture, this chemical admixture includes, but is not limited to: accelerating chemicals, air entrapment agent, defoamer, water reducer, retardant (in ASTM C494, stipulating) or the like, and composition thereof.Admixture of the present invention can use with Portland cement or mixed cement.

Those skilled in the art uses the detailed description in front, can utilize the present invention maximum range.The following examples explanation the present invention is provided, but should limit the present invention in any form, unless out at the appended claims middle finger.All umbers and per-cent are by weight, unless otherwise noted outside, admixture is per-cent (%S/C) (based on the dry cement weight) expression with solid active agent.Measure the pressure of cement sample according to ASTM method C109.Use is purchased cement and the following embodiment of grog preparation.

Embodiment 1

This embodiment has illustrated that the porosity of the mortar that makes with DEIPA and final surface are improved.According to two kinds of mortars of EN196 standard fabrication, a kind of DEIPA that contains, and the another kind of TIPA that contains equivalent is as a comparison.After air content was measured, the cast mortar was not made firm by ramming or is vibrated and makes its maintenance 1 day.The electronic simulation of each specimen surface (referring to Fig. 2) shows that using the mortar made from the cement of the common mill of tri-isopropanolamine (TIPA) to produce is permitted great surperficial hole and produce macropore in mortar.Yet, cannot see these big holes and macropore (referring to Fig. 1) in the cement made from DEIPA.

Embodiment 2

This embodiment has illustrated to use and has equaled the mortar air content that the cement of the fineness measured by Bu Laiyin specific surface (BSA) method of masurement makes to fineness with the DEIPA of two factories and TIPA grinding and obtain reducing.Use the method preparation standard mortar of EN196 regulation.The air content of made mortar the results are shown in the Table I.

Table I

Factory	Admixture	Consumption (%)	BSA(m 2/kg)	Air (%)
					1	DEIPA	0.006	418	5.1
1	TIPA	0.010	418	7.2
					2	DEIPA	0.010	338	5.7
2	TIPA	0.010	340	6.8

Embodiment 3

This embodiment explanation can reduce to produce the trend of foam or bubble with DEIPA.With with from the DEIPA of two factories and the cement production grout of TIPA grinding.The foam that also illustrates the slip for preparing with typical high efficiency water reducing agent can reduce.The water reducer that uses is naphthalenesulfonate (NSFC) and melamine (MSFC) water reducer.Take by weighing 20 gram cement, join in 50 milliliters the test tube.Then 20 gram water are joined in this test tube.Rock 15 seconds of this grout.After rocking, mark the scale of the overhead height of bubble immediately.Calculate the foam result, account for the volume percent of whole slurry solution as foam.The results are shown in the Table II.

Table II

Factory	Additive	Consumption (%)	BSA(m 2/kg)	Air (%)
					1	DEIPA	0.006	418	5.5
1	TIPA	0.010	418	9.0
					2	DEIPA	0.010	338	5.5
2	TIPA	0.010	340	11.5
					2	DEIPA+NSFC	0.010	338	7.8
2	TIPA+NSFC	0.010	340	13.2
					2	DEIPA+MSFC	0.010	338	4.5
2	TIPA+MSFC	0.010	340	9.3

Embodiment 4

This embodiment illustrates mortar and the concrete bleed and the bubble formation minimizing of making as admixture with DEIPA.In this test, the admixture and the 550 gram water that in mixing tank, add 0.15 gram.1000 gram cement are joined in succession and begin low speed mixing in the mixing tank.After mixing 30 seconds, 2600 sand of building by laying bricks or stones that restrain are joined in the cement paste mixture.Then mix and reach 5 minutes.In the TIPA mixture, air content surpasses the air content of DEIPA and trolamine (TEA) mixture.We find also that when using DEIPA the mortar open bubble reduces and workability strengthens.The result is summarised in the Table III.Speed is 10 o'clock, and workability is best, and workability was the poorest in 0 o'clock.

Table III

Cement	Admixture	Air (%)	Bubble quantity and bubble	Workability
					A	TIPA	4.1	At most	8
A	TEA	2.6	Almost do not have	7
					A	DEIPA	3.2	Some	9

Embodiment 5

The bubble of this embodiment explanation air content, formation in the mortar made from DEIPA and conventional concrete admixture reduces and product surface improves.The concrete admixture that uses is naphthalenesulfonate water reducer (NSCF), melamine water reducer (MSFC), vinylformic acid and olefin oxide multipolymer water reducer (COMB), ready denier oil acid air entrapment agent (TOFA) and rosin air entrapment agent.In this test, 2000 gram cement, 4500 gram concrete sand are mixed the degree of mobilization that produces 90-100% with enough water.Cement additive and concrete admixture are added with the water of mixing outward.The results are shown in the Table IV.

Table IV

Cement	Admixture+outer permeation	W/c	Slump (cm)	Air (%)	Bubble	Final surface
							A A A	TEA+NSFC DEIPA+NSFC TIPA+NSFC	0.525 0.525 0.525	9.8 9.9 10.5	3.3 3.7 3.5	A small amount of	Fabulous good job
A A A	TEA+MSFC DEIPA+MSFC TIPA+MSFC	0.510 0.510 0.510	9.7 9.8 10.4	3.5 3.9 4.5	Some are many on a small quantity	Fairly good fairly good
							A A A	TEA+COMB DEIPA+COMB TIPA+COMB	0.500 0.500 0.500	10.0 10.7 10.5	4.5 4.1 4.3	Many on a small quantity	Fabulous fairly good
A A A	TEA+TOFA DEIPA+TOFA TIPA+TOFA	0.550 0.550 0.550	9.6 9.7 9.7	13.4 13.0 13.4	Some are many on a small quantity	Good fabulous poor
							A A A	TEA+ rosin DEIPA+ rosin TIPA+ rosin	0.525 0.525 0.525	10.4 10.6 10.7	15.0 12.6 12.7	Some are a small amount of	Carefully fairly good

Embodiment 6

When this embodiment explanation was compared with the cement for preparing with TIPA and TEA, the mortar ultimate compression strength of being made with the DEIPA admixture by six kinds of different (Portland) cement improved.The method of using ASTM C109 regulation is by six kinds of mortar cubess that are purchased two inches of cement production.Before adding cement, the admixture consumption of admixture with every gram cement 0.0001 gram joined in the mixing water.Measure the pressure of resulting cubes 1,3, the 7 and 28 day length of time.Table V has been represented to be better than TEA and TIPA usually at DEIPA aspect raising early strength (1 day and 3 days) and the later strength (7 days and 28 days).

Table V

Cement	Admixture consumption (%s/s)	Stream degree of advising air (%) (%)	Ultimate compression strength (Mpa) 1 day 3 days 7 days 28 days	Crushing strength 1 day 3 days 7 days 28 days
					A A A	TEA 0.010 DEIPA 0.010 TIPA 0.010	120 8.2 118 9.2 118 9.4	9.2 21.3 31.0 35.3 9.5 23.3 32.8 43.6 9.1 20.9 26.0 35.3	100 100 100 100 103 109 106 123 99 98 84 111
B B B	TEA 0.010 DEIPA 0.010 TIPA 0.010	119 9.1 120 9.8 118 9.8	6.1 18.5 26.8 44.8 6.8 20.4 30.3 43 5.5 17.8 26.5 45	100 100 100 100 111 110 113 96 90 96 99 100
					C C C	TEA 0.010 DEIPA 0.010 TIPA 0.010	112 9.1 118 9.5 116 10	7.9 20.3 34.2 41.4 7.6 20.7 31.3 42.4 7.2 20 29.6 41.8	100 100 100 100 96 102 92 103 91 99 87 101
D D D	TEA 0.010 DEIPA 0.010 TIPA 0.010	118 9.3 118 11.1 118 11.8	11.5 23.9 30.6 39.1 11.9 23.6 30.6 42.8 10.3 22.5 29.7 43.3	100 100 100 100 103 99 100 109 90 94 97 111
					E E E	TEA 0.010 DEIPA 0.010 TIPA 0.010	111 9.2 113 9.4 112 8.7	10.7 21.6 28.4 41.0 12.4 23.7 32.5 49.8 11.3 22.2 29.8 48.6	100 100 100 100 116 110 114 121 106 103 105 118

Embodiment 7

This embodiment illustrates with EDIPA intensity 2,7 and 28 days the time and strengthens out of a clear sky.The method of using ASTM C109 regulation is with two kinds of industrial cement production standard mortars, and 2 inches cubess making with this mortar of measurement were at 2,7 and 28 days pressure.

Table VI

Cement additive consumption (%s/s)	Ultimate compression strength (Mpa) 2 days 7 days 28 days	Ultimate compression strength (with respect to TEA%) 2 days 7 days 28 days
			F TEA 0.010 F EDIPA 0.010	21.7 28.7 37.0 23.1 32.9 42.5	100 100 100 106 115 115
G TEA 0.010 G EDIPA 0.010	21.6 30.2 37.8 21.6 32.5 43.0	100 100 100 100 108 114

Embodiment 8

This embodiment illustrates the growth of the mortar strength of being made by 7 groups of laboratory grinding fine cements.In the grinding machine of laboratory, be about 360m with different grinding aid grinding together to the Bu Laiyin specific surface area with 95 parts of portland cements (model I or II) grog and 5 parts of gypsum ²/ kg.TEA, DEIPA and TIPA admixture are the form addings of reacting the acetate that forms with acetic acid respectively with one of TEA, DEIPA and TIPA.At room temperature use 3325 gram grogs and 175 gram gypsum to grind.

Measure the average mill efficiency of average specific surface area conduct that ball mill per 100 is changed the line of production living, the result shows that TIPA acetate and DEIPA acetate have mill efficiency preferably than TEA.

C-109 mortar strength result shows that DEIPA acetate is more effective than TEA acetate and TIPA acetate in each length of time.These test-results are shown in the Table VII.

Table VII

Cement additive BSA BSA/ m 2/ kg) 100 change	Ultimate compression strength (MPa) 1 day 3 days 7 days 28 days	Ultimate compression strength (with respect to the % of HEA-2) 1 day 3 days 7 days 28 days
			H TEA 359 4.95 H DEIPA 364 5.71 H TIPA 360 5.64	9.5 24.8 31.0 41.0 10.7 26.9 34.3 44.8 9.4 26.1 34.2 44.8	100 100 100 100 112 108 111 109 99 105 100 109
I TEA 357 4.24 I DEIPA 360 4.60 I TIPA 362 4.62	7.7 20.3 27.0 37.0 7.8 23.8 33.2 48.5 7.4 23.5 32.8 47.9	100 100 100 100 101 117 123 131 96 116 121 129
			J TEA 361 4.02 J DEIPA 358 4.57 J TIPA 363 4.32	8.6 21.7 28.3 38.2 8.1 22.1 26.9 40.6 7.6 22.0 26.6 41.7	100 100 100 100 94 102 95 106 88 102 94 109
K TEA 358 5.37 K DEIPA 357 5.60 K TIPA 355 5.83	8.1 17.5 22.6 32.8 8.8 17.6 28.0 39.7 8.4 17.3 27.2 39.7	100 100 100 100 109 101 124 121 104 99 120 121
			L TEA 410 5.44 L DEIPA 407 6.10 L TIPA 407 6.10	15.9 31.4 35.1 48.2 14.9 29.0 37.0 50.9 12.8 26.8 34.1 47.5	100 100 100 100 94 92 105 106 81 85 97 99
M TEA 358 5.14 M DEIPA 359 5.63 M TIPA 360 5.64	17.7 25.0 27.2 34.9 17.2 27.9 31.6 38.6 18.1 26.3 31.9 36.6	100 100 100 100 97 112 116 111 102 105 118 105
			N TEA 359 5.16 N DEIPA 360 5.40 N TIPA 357 5.35	14.1 23.2 27.2 32.5 17.5 27.8 30.6 35.1 17.0 27.0 32.0 39.2	100 100 100 100 124 120 112 108 120 116 117 121

Embodiment 9

This embodiment illustrates and uses DEIPA and EDIPA and Wingdale mixed cement to strengthen intensity out of a clear sky.Employed cement be to use roller mill with industrial cement (cement G) and Kosmos Wingdale mixed.Wingdale is that 5% and 10% (weight) adds with cement replacement rate.Adding rate with 100ppm adds amine.2 inches cubess that the method preparation standard mortar that use is stipulated in ASTM C109 and measure makes with this mortar were 2,7 and 28 days intensity.In Table VIII, mixed cement and common non-blended portland cement (OPC) are compared.

Table VIII

Wingdale (%)	Admixture consumption (%)	Ultimate compression strength (MPa) 2 days 7 days 28 days	Ultimate compression strength (with respect to OPC%) 2 days 7 days 28 days
				0	TEA 0.010	21.6 30.2 37.8	100 100 100
5 5 5 5	TEA 0.010 DEIPA 0.010 EDIPA 0.010 TIPA 0.010	20.7 27.2 37.9 21.4 31.2 40.3 21.7 34.0 44.4 20.9 32.0 42.3	96 90 100 99 103 107 100 113 117 97 106 112
				10 10 10 10	TEA 0.010 DEIPA 0.010 EDIPA 0.010 TIPA 0.010	21.1 28.9 35.3 21.7 30.5 38.8 23.0 33.2 42.5 20.8 31.2 40.4	98 96 93 100 101 103 106 110 112 96 103 107

Embodiment 10

This embodiment explanation is used with DEIPA and TIPA and is ground to mortar that service water mud that fineness equals the fineness measured with Bu Laiyin specific surface area (BSA) method makes altogether out of a clear sky early with fixed attention.The method that use is stipulated in EN196 is carried out Vicat and is condensed-the time test.The results are shown among the Table I X.

Table I X

Factory	Admixture consumption (%)	BSA(m 2/kg)	Water requirement (%)	Initial set (minute)	Final set (minute)
						1 1	DEIPA 0.006 TIPA 0.010	418 418	27.0 27.0	165 210	210 330

Embodiment 11

This embodiment and table 10 show that DEIPA and TIPA are mixed with each other and obtain intensity enhancing.When also being mixed together when using with known admixture such as soluble alkali metal salts accelerating chemicals and retardant, can the refinforced cement performance.

Table X

Cement	Admixture consumption (%s/s)	Degree of mobilization air (%) (%)	Ultimate compression strength (MPa) 1 day 3 days 7 days 28 days	1 day
					F F	TEA 0.010 DEIPA/ 0.005/ TIPA 0.005	105 8.5 104 8.7	10.3 22.2 29.1 38.2 10.5 23.9 30.7 41.6	100 102

Admixture of the present invention has improved the time of coagulation of the composition that comprises cement and out of a clear sky at the pressure in each length of time.Low bubble, low pore, low porosity and the air content of the cement composition that produces by these admixtures reduce be equally exceed unexpected.

Different with the cement composition that uses the preparation of prior art and TIPA admixture, use the cement composition of admixture of the present invention when mixing, can not have not right " explosion " noise with water.Exceed unexpected the improvement with the final surface of the cement composition of admixture of the present invention preparation at last and make and can make the said composition smooth surface quickly after placing, thus time saving and energy saving.

Claims (22)

1, a kind of hydraulic cement composition, said composition contains portland cement and is no more than the azanol of said cement weight 0.1%, azanol is selected from N, two (2-hydroxyethyl)-2-Propanolamine and the N of N-, two (2-hydroxypropyl)-N-(hydroxyethyl) amine of N-, the content of said azanol is after water being mixed with this azanol and cement composition is solidified, and cement composition was increased the effective content of ultimate compression strength after 1,3 and 7 day.

2, the cement composition of claim 1, wherein said composition also demonstrates the amount of air entrainment that has minimizing after hydration, the bubble formation amount of minimizing, the porosity of improvement and the final surface of improvement.

3, the cement composition of claim 1, wherein said azanol is N, two (2-the hydroxyethyl)-2-Propanolamines of N-.

4, the cement composition of claim 1, wherein said azanol is N, two (2-hydroxypropyl)-(hydroxyethyl) amine of N-.

5, the cement composition of claim 1, wherein the add-on of said azanol is 0.05% weight that is less than cement weight.

6, the cement composition of claim 1, wherein the add-on of said azanol is the 0.001-0.03% weight of cement weight.

7, the cement composition of claim 1, wherein said cement is the portland cement that contains at least 4% tetracalcium aluminoferrite.

8, the cement composition of claim 1, wherein said composition are to be prepared by the grog that contains the grog surrogate, and this grog provides described composition to surpass 7 days ultimate compression strength.

9, the cement composition of claim 8, wherein said surrogate is a Wingdale.

10, the method for 1,3 and 7 of a kind of refinforced cement composition day ultimate compression strength, this method be included in the said cement composition add be no more than 0.2% from N, two (2-hydroxyethyl)-2-Propanolamine and the N of N-, a kind of azanol of selecting in two (2-hydroxypropyl)-N-(hydroxyethyl) amine of N-.

11, the method for claim 10, the cement composition that wherein adds azanol, compare with the cement composition of the tri-isopropanolamine that adds equal amts, have the porosity of amount of air entrainment, bubble formation amount, foam volume and improvement of minimizing and the surface of refinforced cement finished product.

12, a kind of increase the portland cement composition after the described cement of aquation 1,3 and 7 day ultimate compression strength and reduce amount of air entrainment, the bubble formation amount in the cement after aquation and improve porosity and the method on the surface of refinforced cement finished product, this method comprises that adding is from N, two (2-hydroxyethyl)-2-Propanolamine and the N of N-, a kind of azanol of selecting in two (2-hydroxypropyl)-N-(hydroxyethyl) amine of N-, its add-on are to increasing the significant quantity of the ultimate compression strength of cement composition after 1,3 and 7 day.

13, the method for claim 12 wherein also adds a kind of admixture of selecting from accelerating chemicals admixture, retardant admixture, air entrapment agent, defoamer and water reducer admixture except adding a kind of azanol.

14, the method for claim 13, wherein admixture comprises said azanol and the molecular weight mixture for polyoxytrimethylene-polyethylene oxide block copolymer of at least 2500.

15, the method for claim 12, wherein said azanol comprise a kind of mixture of at least a and trolamine, triisopropylamine and their mixture in the said azanol class.

16, the method for claim 12, wherein said azanol comprises a kind of mixture of at least a and water-soluble an alkali metal salt in the azanol class.

17, the method for claim 16, salt wherein comprise oxyhydroxide, vitriol, muriate, acetate, formate, phenolate, carbonate, silicate, gluconate or its mixture.

18, the method for claim 12, wherein said azanol are to exist with the salt of described azanol or with the form of organic acid ester.

19, grind the method for portland cement clinker, this method comprises grinds said grog altogether with the azanol that is no more than said grog weight 0.1%, described azanol is selected from N, two (2-hydroxyethyl)-2-Propanolamine and the N of N-, two (2-hydroxypropyl) N-(hydroxyethyl) amine of N-, the add-on of this azanol increased ultimate compression strength to cement composition and effectively measures for after water being mixed with this azanol and cement composition is solidified after 1,3 and 7 day.

20, the blended cement composition that a kind of intensity increases, said composition comprises portland cement clinker, gypsum, a kind of mixture of the grog surrogate of 2%-80% weight, this surrogate contains the azanol that is no more than 0.1% weight by described cement weight, this azanol is from N, two (2-hydroxyethyl)-2-Propanolamine and the N of N-, select in two (2-hydroxypropyl)-N-(hydroxyethyl) amine of N-, with after this cement composition hydration 1, increase ultimate compression strength after 3 and 7 days, this cement composition shows the amount of air entrainment with minimizing, the bubble formation amount that reduces, the porosity and the enhanced finished cement surface of improving.

21, the composition of claim 20, wherein said grog surrogate is selected from the fuel ash of Wingdale, natural volcanic ash, artificial volcanic ash, granulated blast furnace slag and grinding.

22, a kind of concrete composition, said composition comprises the cement composition of sand, coarse aggregate, water and claim 20.

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