CN101575194A - C80 pump concrete and preparation method thereof - Google Patents

Abstract

The invention relates to concrete, in particular to C80 pump concrete. The invention also relates to a preparation method of the C80 pump concrete. The C80 pump concrete is characterized by being prepared from the following raw materials according to weight proportions, 0.26 of water, 1.00 of composite gelled material, 1.21 of sand, 1.72 of gravels, and additive accounting for 2.32 percent of the total weight. The preparation method of the C80 pump concrete is as follows: stirring the mixed raw materials in a stirrer, wherein the motor current of the stirrer is 60-70A, the stirring time is 120-180s, and the addition order of the materials is as follows: (1) firstly, adding the gravels and 60-80 percent of the sand and stirring for 10s; (2) then, adding the composite gelled material and stirring for 20s; and beginning to add 70-80 percent of the water after the stirring is performed for 10s, and adding the additive in the water; (3) then, adding the rest sand and stirring for 20s; (4) then, adding the rest water and stirring for 70-130s; and (5) discharging the concrete.

Description

A kind of C80 pump concrete and preparation method thereof

Technical field

The present invention relates to a kind of concrete, particularly the C80 pump concrete; The invention still further relates to its preparation method.

Background technology

(＞C50) appearance is the thing after the seventies in 20th century to strong concrete, and along with the continuous progress with concrete technology of developing rapidly of science and technology, the concrete average intensity that use countries in the world improves constantly.The concrete of development high strength grade, alleviate dead load, satisfy intensity, all there is good technology economic aspects such as economical with materials and saving fund.Therefore, according in the practice to the concrete requirement of C80, under the existing installation condition, at the material of high-performance, strong concrete select, proportioning is determined and test in place is inquired into and studied.Especially under existing single horizontal axis whipping device prerequisite,, put forth effort practical studies is carried out in the improvement of preparation stirring technique flow process at the concrete characteristic of C80.Come final definite preparation stirring technique flow process that adapts with production by experiment.

Summary of the invention

The first aspect of technical problem to be solved by this invention is to propose a kind of C80 pump concrete.

The present invention solves the problems of the technologies described above by the following technical programs:

A kind of C80 pump concrete is characterized in that, is formed by the feedstock production of following weight ratio:

Water 0.26

Composite gelled material 1.00

Sand 1.21

Rubble 1.72

Admixture accounts for 2.32% of raw material gross weight.

Described composite gelled material is mixed by cement, flyash, breeze, and its weight ratio is 69: 14: 17.

Described cement is PI52.5 cement.

Described flyash is an I level ash.

Described breeze is the S95 breeze.

Described sand is that fineness modulus is 2.8～3.0 yellow ground.

Described rubble is the rubble of 5～20mm.

Described admixture is a SP-8N type high efficiency water reducing agent.Use the relatively good of mix state that SP-8N type high efficiency water reducing agent obtains and final strength.

The second aspect of technical problem to be solved by this invention is to propose the preparation method of above-mentioned C80 pump concrete.

A kind of method for preparing the described C80 pump concrete of claim 1 is blended in raw material in the stirrer and stirs, and it is characterized in that the current of electric of stirrer is 60～70A, and churning time is 120～130s, and feeding sequence is as follows:

1) elder generation drops into the sand of rubble and 60%～80%, stirs 10s;

2) drop into composite gel material then, stir 20s; When 10s, begin to add 70～80% water, drop into admixture in the water;

3) drop into remaining sand then, stir 20s;

4) add remainder water then, stir 70s～80s;

5) discharging.

Further, the single-deck side of stirrer amount is 1.0m ³～1.2m ³

Description of drawings

Further specify the present invention below in conjunction with the drawings and specific embodiments.

The different yellow ground of Fig. 1 fineness modulus is to the influence of C80 intensity

Embodiment

For technique means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.

One, raw-material selection

1, admixture

The high-strength concrete mix is less and dried thick because of water cement ratio, mix the high-performance admixture and can reduce water-cement ratio significantly, increase the concrete slump, and improve its workability, and need powerful the stirring just can make its all even activity of cement of giving full play to, and obtain best conveying, serviceability such as vibrate, reduce slump-loss.Existing three kinds of high efficiency water reducing agents (3301, R25 and SP-8N) are compared, observe mix performance and 28 days intensity (detailed data sees Table 1) relatively.

Table 1 different varieties admixture is to the influence of C80 mix proterties and intensity

The comparison of comprehensive mix state and final strength selects SP-8N type high efficiency water reducing agent as admixture of the present invention.Because high-strength high-performance concrete has higher pumpability requirement, so need to adjust admixture dosage, improve concrete degree of mobilization, reduce concrete viscosity.Improve concrete workability.By table 2 as can be known, when volume reach gelling material 2.3% the time, concrete workability and intensity are all more satisfactory.

The different admixture dosages of table 2 are to the influence of concrete mix

Numbering	Admixture dosage	The slump (mm)	Divergence (mm)	The mix state	28 days intensity (MPa)
						1	1.6％	220	510*520	Sticking	89.6
2	2.0％	230	620*610	Sticking partially	85.9
						3	2.3％	250	670*670	Loose	93.5
4	2.5％	255	720*750	Pine, bleeding	86.3

2, flyash

After mixing flyash, the workability of concrete mix improves, and helps to improve concrete density, thereby improves concrete strength, and this point is contributed to some extent to the concrete early strength; And secondary reaction takes place in flyash in concrete, its hydrated product has been filled the space in the concrete, has also strengthened the interface structure of cement and aggregate simultaneously, has improved boundary strength greatly, thereby the raising concrete strength, it is bigger that this point increases contribution to late strength of concrete.In addition, the spherical particulate particle shape of flyash effect can make alkali content reduction in the concrete, helps to reduce water consumption, and therefore, the correct selection of flyash is also very important to proof strength.

By research existing literature data, find in the test of in the past high-strength concrete, adopt I level ash as Additive, and high calcium ash commonly used to use less in daily production more.Consider that high calcium ash can produce microdilatancy, can offset a part of cement and shrink, therefore II level high calcium ash and the low calcium ash of I level are all tested that the result shows that high calcium ash is to the too late I level ash of the contribution of intensity, so selection I level ash is used in the present invention.

The low calcium ash of table 3II level high calcium ash and I level sampling contrast

	II level high calcium ash (creation)	The I level is hanged down calcium ash (Hua Yuan)
			Fineness %	23.5	7.0
Water demand ratio %	98	91
			Loss on ignition %	2.40	2.50
Water content %	0.1	0.2
			Stability	2.5	0.8
Sulphur trioxide %	1.17	0.08
			Free calcium oxide %	2.29	0.91

3, cement and admixture

Document shows, when the preparation high-strength high-performance concrete, pure silicon 52.5 cement that adopt more, but the cement consumption of considering the C80 high-strength concrete is more relatively, there is more cement in concrete, only to play filling effect,, observes concrete every technical feature so select for use the higher relatively P.II of intensity 42.5 cement and P I 52.5 and P II 52.5 cement to carry out the concrete simultaneous test, particularly concrete weather resistance and long-term behaviour, the selection face when increasing the preparation of C80 concrete.By P II 42.5 and P I 52.5 and P II 52.5 have been carried out test of many times relatively,, P.I 52.5 conch cement have finally been selected for use for intensity and adaptive lateral thinking.(testing data sees Table 4).

Table 4

On the basis of simultaneous test, also to the adaptability of composite blend and admixture contrast (data see Table 5)

Table 5

4, yellow ground

The fineness modulus of yellow ground is bigger to the quality of concrete influence, and the yellow ground fineness modulus is more little in normal concrete, and the unit water requirement is big more, can cause the reduction of concrete strength.By the different yellow ground of fineness modulus has been done test of many times (testing data is referring to Fig. 1), we find that this rule exists too in high-strength concrete, and concrete intensity improves with the increase of yellow ground fineness modulus.Consider that the excessive yellow ground of fineness modulus often has more cobble and is difficult for screening out, can influence concrete quality, finally selecting fineness modulus is 2.8～3.0 yellow ground.

5, rubble

Slurry content is very high in the high-strength concrete mix; and viscosity is bigger; the chance that the coarse aggregate particle contacts with each other, rubs reduces; therefore; granule strength to coarse aggregate requires higher; requirement to its maximum particle diameter is also higher, improves the uniformity of concrete itself and reduces defective with this, guarantees good mobility.While is based on the requirement of high performance concrete, the concrete mix must have good flowability and pumping, and satisfied on-the-spot pump-conveying property, so we have done relatively (detailed data sees Table 6) with the 5-20mm rubble of Huzhou new millennium and the every technical indicator of rubble of new Katyuan 5-20mm, finally the rubble of selected new Katyuan 5-20mm is used for C80.

The rubble sampling contrast of table 65-25mm rubble and 5-20mm

	5-20mm (new millennium)	5-20mm (new Katyuan)
			Apparent density kg/m3	2640	2720
Tap density kg/m3	1460	1520
			Tight density kg/m3	1560	1660
Silt content %	0.4	0.2
			Clod content %	0.1	0
Faller gill shape granule content %	7	2
			Crush index %	7	2

Embodiment 1

The fundamental principle of design of common concrete proportioning is that sand is filled the stone space, and grout is filled the sand space, can adopt concrete consistence and adjust sand coarse aggregate ratio on the water cement ratio control intensity based and water consumption is controlled.And the factor that influences high-strength concrete intensity mainly is strength of cement and water cement ratio.Normal concrete is much smaller because the water cement ratio of high-strength concrete compares, and under the condition of vibration compacting, the internal void amount is lacked than normal concrete, and its pore texture has bigger improvement.The original crack that the barrier film that catchments around the aggregate forms is also lacked than normal concrete, adds coarse aggregate size and reduces relatively, therefore, when design mixture proportion, should take all factors into consideration above-mentioned factor.

The raw materials in sequence of selecting for use is: cement: Haimen, PI 52.5 Jiangsu conch cement limited liability company

Yellow ground: 2.8～3.0 Wuhus numerous material of construction of grassland company limited

Rubble: new Katyuan, 5-20mm Huzhou rubble company limited

Water: tap water

Flyash: I level ash Zhenjiang Hua Yuan novel material company limited

Admixture: SP-8N Shanghai Mace spy builds worker High Seience Technology Co., Ltd.

Breeze: S95 Shanghai Baotian New Type Building Material Co., Ltd

The proportioning of determining is as shown in table 7:

Divergence: 700 ± 50mm sand coarse aggregate ratio: 41% water-cement ratio: 0.26

Table 7 benchmark proportioning

When the proportioning design of high-strength concrete, selecting suitable starting material for use by test is the important means that guarantee concrete quality, " two method of mixing " technology that high-performance admixture and Additive are mixed in utilization simultaneously, can make concrete guarantee to reduce water cement ratio as far as possible under the good construction performance condition, also need improve the coarse-fine aggregate level as far as possible and be equipped with its voidage of minimizing, and adopt and force stirring technique to improve cement strength, improve concrete physical and mechanical property.Through test of many times, the concrete production of C80 has had certain theoretical basis and practical experience, and big production has suitable reference value to reality.

Two, Production Flow Chart control

1, the cleaning of stockyard silo and use

It is new Katyuan 5-20mm rubble that the present invention produces used coarse aggregate, and fine aggregate is the II district medium sand of fineness modulus 2.8～3.0.So the class starting material are independently stacked and assigned sign, and be responsible for cleaning by the special messenger and prevent sand, ponding influence in clitter field is produced.Produce gelling material such as used cement, flyash and accomplish the special use of special storehouse, fixed bin number.Before formal charging is produced, all there is the special messenger to be responsible for silo inside is cleared up, guarantees after powder advances silo, not have the possibility of batch mixing with preceding nonrecoverable powder.

2, the actual using method of starting material

This was tested used coarse-fine aggregate in preceding 3 hours in each test and carry out the water ratio test, the gained data in time feed back to mixes platform.This work is finished by the laboratory test personnel.Guarantee that admixture is not contaminated in storage process, before test, the starting material feeding warehouse confirmed that this work is worked in coordination by material strand and testing laboratory and finished.

3, mix determining of machine actual production technical process

3,1 mix determining of machine single-deck stirring side amount

Mix the system high-strength concrete according to " High Strength Pump Concrete production and construction regulations " relevant regulations (DG/TJ08-503-2000) and need use forced mixer.The production unit existing installation is to develop the single horizontal shaft type 2m that makes voluntarily after stirring station is digested and assimilated external whipping device ³Concrete Stall two-shipper facilities of mix storied building, the major equipment configuration sees Table 8.

Table 8

Sequence number	Device name	Specification and configuration	Remarks
				1	Stirrer	Imitative Germany system ALBA2m 3Machine MAO3000/2000 (single horizontal axis)	Blanking device: 2 grades of hydraulic pressure
2	The aggregate weighing	Scale hooper (3000kg*1,1500kg*1) arc door, cylinder, vibrator	With the aggregate bin end opening is the boundary.The source of the gas second-stage treatment

		Amount to 2 covers	Oil, water separator
				3	Powder weighing	Scale hooper (12000kg*1,600kg*1) fly-ash separator * 3 amounts to 2 covers	With the filler bin end opening is the boundary.With cleaning apparatus after 10 seconds no dust rout up.
4	Cement is carried	Air conveying
				5	Water, admixture weighing	Water claims bucket (500kg*1) weighing hopper (60kg*1) band discharge protection admixture to mix leaf (2.2kw*1)	With water pump, noncorrosive pump import is the boundary.
6	The electronic weighting system	LOAD CELLS * 6 (aggregate, cement class, water, admixture and annex thereof) expects repeatedly weighing synergetic control respectively for two kinds, and signal adjusts interface board and communication cable level detector * 6 is provided with lead 19 (overshoot) zero-bit tracking automatically, auto thermal compensation aanalogvoltage output interface respectively
				7	The concrete GEOMAP	Digital output module switching value tablet

A/D conversion module weighing signal is adjusted 17 inches indicating meter LQ1600KIII of plate PC Industrial Control Computer pin type uninterruptible power supply UPS/500-1000VA Commercial Concrete production control management special software

High Strength Pump Concrete is because the particle of composite gelled material is thinner, and the powder amount is more, be at existing single horizontal shaft type 2m ³Stirrer is fully mixed thoroughly, except proper extension the time, must take to reduce single-deck amount of agitation, fed batch, the ways such as adding water that lags behind, contingent gelling material conglomeration when stirring to solve, sand lump, mix dynamo-electric flowing through greatly and problems such as damage equipment.The variation of current of electric can be selected rational single-deck amount of agitation, to adapt to needs of scale production when working by mixing machine.(seeing Table 9)

Table 9

Single-deck side amount (m 3)	Current of electric (A)	Mix the machine working order
			2.0	＞150	Mix the machine tripping operation
1.8	140	The machine of mixing is reported to the police
			1.5	130	The machine of mixing is intermittently reported to the police
1.2	110	It is smooth and easy to mix machine work
			1.0	100	It is smooth and easy to mix machine work

Annotate: electric current is for mixing machine initialization electric current in the table

Can see that by test single-deck side's amount is at 1.0m ³To 1.2m ³In time, mixes machine and can keep smooth and easy working order, but considers the problem of supply in process of production, so select single-deck 1.2m ³

3.2 mix determining of machine churning time

Original stirring technique:

Annotate: 1 above-mentioned churning time does not comprise the blanking time of aggregate and gelling material, promptly stirs 10s after the coarse-fine aggregate input, drops into gelling material then, has thrown gelling material and has stirred 20s, begins to add water behind 10s.

Being dropped in of 2 admixtures adds the centre that water stirs when 10s (about) and begins input.

After 3 admixtures had been thrown, stirring 40s at least can discharging.

Before each concrete production, to clean adjustment to stirrer, because the singularity of C80 concrete, find that in all previous test original machine feeding sequence of mixing can't make the polycarboxylic acid admixture play a role in churning time, often cause concrete to dispatch from the factory the slump less than arriving the cast-in-place slump.Based on above-mentioned original stirring technique, carried out test of many times, determine best churning time by the variation relation of churning time and current of electric.(seeing Table 10)

Table 10

Churning time (s)

Current of electric (A)

The concrete state

Divergence (mm)

Divergence changes (mm)

70	130	Stiff, can't blanking
					90	100	Viscosity is big, but blanking, and conglomeration is more	450*470	640*590
110	80	More sticking, but blanking has conglomeration	550*590	630*680
					120	70	Pine, but blanking, conglomeration is few	660*650	680*690
180	60	Pine, but blanking do not have conglomeration substantially	670*700	680*700

Annotate: 1. divergence is changed to the concrete one hour measured divergence of stirring of rolling in mixing car.

2. electric current is for mixing machine discharging working current in showing.

3.3 determining of stirrer feeding mode

After the variation of comprehensively having compared concrete state and current of electric under the different churning time, divergence, consider that the needs of actual production supply are finally determined churning time 120s.Meanwhile,, effectively reduce stirrer load for further improving the concrete gel material clustering phenomena, the control current of electric, we have designed the contrast that experimentizes of different feeding sequences.

Feeding mode one:

Annotate: 1 above-mentioned churning time does not comprise the blanking time of aggregate and gelling material, promptly stirs 10s after coarse aggregate and the 80% fine aggregate input, drops into gelling material then, has thrown gelling material and has stirred 20s, begins to add water behind 10s.Admixture is dropped in the water.

2 20% fine aggregates are dropped in the centre that adds water and stir when 10s (about) and begin to drop into stirring 90～100s discharging

Feeding mode two:

Annotate: 1 above-mentioned churning time does not comprise the blanking time of aggregate and gelling material, promptly stirs 10s after coarse aggregate and the 70% fine aggregate input, drops into gelling material then, has thrown gelling material and has stirred 20s, begins to add 70% water behind 10s.Admixture is dropped in the water.

2 30% fine aggregates are dropped in the centre that adds 70% water and stir when 10s (about) and begin input

3 drop into residue 30% fine aggregate stirring 20s after adding 70% water stirring 30s drops into 30% water stirring, 70～80s discharging.

Feeding mode three:

Annotate: 1 above-mentioned churning time does not comprise the blanking time of aggregate and gelling material, promptly stirs 10s after coarse aggregate and the 60% fine aggregate input, drops into gelling material then, has thrown gelling material and has stirred 20s, begins to add 80% water behind 10s.Admixture is dropped in the water.

2 40% fine aggregates are dropped in the centre that adds 80% water and stir when 10s (about) and begin input

3 drop into residue 40% fine aggregate stirring 20s after adding 80% water stirring 30s drops into 20% water stirring, 70～80s discharging.

Compare (seeing Table 11) at the concrete state that three kinds of feeding modes are obtained and determined that finally promptly throwing 60% yellow ground and rubble stir feeding mode three earlier, throw other 40% yellow ground after 30 seconds again, admixture is dropped in the water, add 80% water input gelling material stirring, throw other 20% water again after 30 seconds.The whole process time spent was at 120～130 seconds.This process can reduce current of electric more effectively, reduces the concrete gel material conglomeration.

Table 11

Feeding mode	Current of electric (A)	The concrete state	Divergence (mm)	Divergence changes (mm)
					Feeding mode one	70	Pine, but blanking, conglomeration is few	630*670	700*670
Feeding mode two	60	Pine, but blanking do not have conglomeration substantially	650*690	710*680
					Feeding mode three	60	Pine, but blanking do not have conglomeration substantially	660*700	690*690

Annotate: divergence is changed to the concrete one hour measured divergence of stirring of rolling in mixing car

Three, transportation guarantee

For guaranteeing building site surrounding environment cleaning, mix car officer loaded vehicle and accomplish the back departures of charging cleaning, water clock does not go out the scene after accomplishing after discharging finishes to clean; Send smoothly for C80 is concrete simultaneously, the stirring vehicle that is used for the transportation of C80 concrete has all been installed the gps satellite station-keeping system, can effectively reduce complicated traffic, the transportation difficulty that road conditions caused.

Four. strength assessment

4, the mathematical statistic method in the concrete assessment method reference of 1 actual C80 " Standard for inspection and assessment of strength of concrete " (GBJ107-87): the 4.1.3 bar is worked as concrete working condition and can not be consistent in a long time, and when the concrete strength variability can not keep stablizing, or the same kind concrete in previous probative term does not have enough data when determine checking and accepting the standard deviation of batch concrete cubic compressive strength, should form an examination by the test specimen that is no less than 10 groups and criticize, its intensity should satisfy the requirement of following formula simultaneously:

$m_{f_{\mathrm{cu}}}-{\mathrm{\λ}}_1{s}_{f_{\mathrm{cu}}}\≥0.9f_{\mathrm{cu},k}---(\mathrm{4.1.3}-1)$

f _cu，min≥λ ₂f _cu，k (4.1.3-2)

In the formula: Sf _Cu---the standard deviation of concrete cubic compressive strength, (N/mm are criticized in same examination ²).

Work as Sf _CuCalculated value less than 0.06fcu, during k, get Sf _Cu=0.06fcu, k;

λ 1, and λ 2---and acceptance coefficient, 4.1.3 takes by table.

The acceptance coefficient table 4.1.3 of concrete strength

The standard deviation Sf of 4.1.4 bar concrete cube ultimate compression strength _CuCalculate by following formula:

$s_{f_{\mathrm{cu}}}=\sqrt{\frac{\underset{i=1}{\overset{z}{\mathrm{\Σ}}}{f_{\mathrm{cu},k}}^2-n{m}_{\mathrm{fcu}}^2}{n-1}}---\left(\mathrm{4.1.4}\right)$

In the formula: fcu, i---cubic compressive strength value (the N/m m of i group concrete sample ²);

N---group number of checking and accepting batch concrete sample.

107,108 engineering C80 concrete strength evaluation results report

Subtabulation

Date manufactured	Engineering name	Construction part	Label	The side's of finishing amount (M3)	7 days intensity (Mpa)	28 days intensity (Mpa)	Divergence (mm)	The sampling license number
									2007-6-1	107 plot	4 layers of post	C80	5	61.9	93.4	750	129
2007-6-2	107 plot	4 layers of post	C80	300	60.9	93.0	750	187
														62.0	93.7	750	187
2007-69	108 plot	4 layers of post	C80	238	59.3	84.6	750	5
														71.8	86.2	750	185
2007-6-10	107 plot	5 layers of post	C80	121	67.3	88.1	750	115
									2007-6-17	108 plot	5 layers of post	C80	123	70.6	87.1	730	183
2007-6-17	107 plot	6 layers of post	C80	124	72.5	84.7	750	189
									2007-6-22	108 plot	6 layers of post	C80	109	71.9	84.2	740	5
2007-6-23	107 plot	7 layers of post	C80	154	66.7	92.6	750	127
									2007-6-29	108 plot	7 layers of post	C80	137	63.0	83.7	750	121
2007-6-29	107 plot	8 layers of post	C80	143	57.3	88.7	740	183
									2007-7-4	108 plot	8 layers of post	C80	148	62.3	89.1	740	193
2007-7-5	107 plot	9 layers of post	C80	142	78.6	89.8	750	3
									2007-7-9	108 plot	9 layers of post	C80	140	73.0	88.6	730	183
2007-7-11	107 plot	10 layers of post	C80	143	62.3	81.2	750	183
									2007-7-14	108 plot	10 layers of post	C80	136	60.7	87.6	730	17
2007-7-16	107 plot	11 frame posts	C80	132	66.5	89.6	730	189
									2007-7-19	108 plot	11 layers of post	C80	130	71.0	85.4	750	181
2007-7-21	107 plot	12 frame posts	C80	143	57.0	81.6	750	91
									2007-7-24	108 plot	13 layers of post	C80	132	71.0	83.4	730	91
2007-7-26	107 plot	13 frame wall columns	C80	138	60.4	86.8	720	183
									2007-7-29	108 plot	13 frame wall columns	C80	133	62.4	85.7	750	91
2007-7-31	107 plot	14 frame posts	C80	133	63.3	86.1	750	15
									2007-8-3	108 plot	14 frame posts	C80	118		84.3	750	181
2007-8-5	107 plot	15 frame posts	C80	108	59.7	88.2	700	163

2007-8-8	108 plot	15 frame posts	C80	93	61.8	86.5	750	127
									2007-8-10	107 plot	16 frame posts	C80	123	737	82.3	750	183
2007-8-13	108 plot	16 frames	C80	101	64.9	84.7	720	115
									2007-8-15	107 plot	17 frame posts	C80	127	66.2	84.4	750	17
2007-8-18	108 plot	17 frames	C80	107	60.9	87.5	750	123
									2007-8-20	107 plot	18 frame posts	C80	118	58.3	832	750	93
2007-8-23	108 plot	18 frames	C80	115	677	92.6	750	127
									2007-8-25	107 plot	19 frame posts	C80	113	68.2	86.8	730	165
2007-8-28	108 plot	19 frame posts	C80	121		90.3	750	129
									2007-8-30	107 plot	20 frame pillars	C80	116	79.1	90.2	750	1
2007-9-2	108 plot	20 frame pillars	C80	126	67.2	84.8	730	9
									2007-9-3	108 plot	20 frame pillars	C80	5	67.2	84.8	730	9
2007-9-4	107 plot	21 frame posts	C80	122	62.1	84.7	750	191
									2007-9-7	108 plot	21 frame column caps	C80	111	75.6	877	750	127
2007-9-9	107 plot	22 frame posts	C80	117	65.2	85.6	750	1
									2007-9-12	108 plot	22 frame posts	C80	112	62.7	82.0	750	91

More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (10)

1, a kind of C80 pump concrete is characterized in that, is formed by the feedstock production of following weight ratio:

Water 0.26

Composite gelled material 1.00

Sand 1.21

Rubble 1.72

Admixture accounts for 2.32% of raw material gross weight.

2, C80 pump concrete according to claim 1, it is characterized in that: described composite gelled material is mixed by cement, flyash, breeze, and its weight ratio is 69: 14: 17.

3, C80 pump concrete according to claim 2 is characterized in that: described cement is PI52.5 cement.

4, C80 pump concrete according to claim 2 is characterized in that: described flyash is an I level ash.

5, C80 pump concrete according to claim 2 is characterized in that: described breeze is the S95 breeze.

6, C80 pump concrete according to claim 1 is characterized in that: described sand is that fineness modulus is 2.8～3.0 yellow ground.

7, C80 pump concrete according to claim 1 is characterized in that: described rubble is the rubble of 5～20mm.

8, C80 pump concrete according to claim 1 is characterized in that: described admixture is a SP-8N type high efficiency water reducing agent.

9, a kind of method for preparing the described C80 pump concrete of claim 1 is blended in raw material in the stirrer and stirs, and it is characterized in that the current of electric of stirrer is 60～70A, and churning time is 120～130s, and feeding sequence is as follows:

1) elder generation drops into the sand of rubble and 60%～80%, stirs 10s;

2) drop into composite gel material then, stir 20s; When 10s, begin to add 70～80% water, drop into admixture in the water;

3) drop into remaining sand then, stir 20s;

4) add remainder water then, stir 70s～80s;

5) discharging.

10, the preparation method of C80 pump concrete according to claim 9 is characterized in that: single-deck side's amount of stirrer is 1.0m ³～1.2m ³

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