CN101941823B

CN101941823B - Concrete with high strength and huge fluidity

Info

Publication number: CN101941823B
Application number: CN2010102967092A
Authority: CN
Inventors: 马志国; 刘冠国; 明静; 胡怀玉; 王卫
Original assignee: Jiangsu Transportation Research Institute Co Ltd
Current assignee: Guizhou Sujiao Engineering Survey And Design Co ltd
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2012-11-14
Anticipated expiration: 2030-09-29
Also published as: CN101941823A

Abstract

The invention relates to concrete with high strength and huge fluidity, the concrete per cubic meter consists of the following components: 390kg of P. II62.5, 210kg of coal ash, 25kg of silica powder, 650kg of sand, 1100kg of continuous graded broken stone which maximum grain size is 5mm-25mm, 150kg of water and 8.4kg of super plasticizer.

Description

A kind of HS super mobility concrete

Technical field

The invention belongs to field of civil engineering concrete material field, a kind of HS super mobility concrete that is specifically related to.

Technical background

According to the regulation of China's related specifications, the slump >=160mm is the high flowability concrete, and the most at present high flowability concrete of China is all as the control requirement.Along with the increase of concrete flowability, make it can realize centralized production, supply at a fixed location, thereby realized the commercialization of concrete production, therefore increasing concrete flowability has all played positive effect for the development of concrete industry, the increase of function.

Yet, along with the continuous increase of concrete slump, produced two technological difficulties that must pay close attention to thereupon:

Therefore (1) increase of the slump will must be guaranteed sufficient water consumption to a great extent, causes the water-cement ratio should not be low excessively, is reflected on the intensity and then can't realizes higher intensity, and fundamental strength is all below C60;

(2) the continuous increase of the slump causes the maintenance of cohesiveness to have big difficulty.When the slump reaches 220mm when above, segregation very easily.

So, overcome above-mentioned technological difficulties, producing a kind of HS super mobility concrete is the problem that needs solution.

Summary of the invention

The objective of the invention is to overcome the defective of prior art; Solve strong concrete (grade of compressive strength reached more than the C80 in 28 days) technical problems such as mixture flowability, workability difference in the mix process; A kind of concrete with super high strength concrete slump and super-high fluidity is provided, thereby improves the concrete construction performance.

The technical scheme that realizes the object of the invention is: a kind of HS super mobility concrete; Every cubic metre said concrete is by the PII 62.5 of 390kg, the flyash of 210kg, the silica flour of 25kg; The sand of 650kg; Maximum particle diameter is the rubble 1100kg of the continuous grading of 5mm～25mm, and the water of 150kg and the high efficiency water reducing agent of 8.4kg are formed, and the correlated performance parameter of above-mentioned each component is following:

1. the related physical mechanical property of cement is seen table 1:

Table 1 cement physical and mechanical property

2. flyash correlation technique parameter is seen table:

Table 2 flyash technical parameter

Fineness (45 μ m square hole sieve)	Water demand ratio (%)	Loss on ignition (%)
			0.19	102	2.4

3. sand facies pass technical indicator is seen table 3:

Table 3 sand technical indicator

Fineness modulus	Silt content (%)	Clod content (%)
			2.54	0.3	0

4. coarse aggregate correlation technique index is seen table 4:

Table 4 coarse aggregate technical indicator

Silt content (%)	Clod content (%)	Faller gill shape granule content (%)	Crush index value (%)
				0.2	0	5.3	5.7

5. the silica flour key index is seen table 5:

Table 5 silica flour key index

Loss on ignition (%)	SiO ₂(％)	Activity index (%)	Water ratio (%)
				1.6	91	21	0.7

6. the high efficiency water reducing agent correlation parameter is seen table 6:

Table 6 high-efficiency water-reducing agent of poly-carboxylic acid index of correlation

Defectives such as strong concrete of the present invention possesses serviceability preferably, and the mixture slump that solves low water binder ratio is less, and workability is relatively poor are controlled high-strength concrete mixture workability preferably, for the lifting of construction quality provides guarantee.

Embodiment

A kind of HS super mobility concrete is combined by following raw material and proportioning.

(1) raw material is following:

1. cement: Anhui conch PII 62.5 cement, its related physical mechanical property is seen table 1.

Table 1 cement physical and mechanical property

2. flyash: Zhenjiang Hua Yuan I level flyash, its correlation technique parameter is seen table 2.

Table 2 flyash technical parameter

3. sand: Ganjiang River mixing medium sand, its correlation technique index is seen table 3.

Table 3 sand technical indicator

Fineness modulus	Silt content (%)	Clod content (%)
			2.54	0.3	0

4. coarse aggregate: (5～25mm), its correlation technique index is seen table 4 to Zhenjiang Chuan Shan rubble.

Table 4 coarse aggregate technical indicator

5. silica flour: its key index is seen table 5

6. high efficiency water reducing agent: Jiangsu Bo Te PCA, correlation parameter is seen table 6

(2) proportioning is as shown in table 7:

The high-strength super mobility concrete mix of table 7

(3) result

1. serviceability is as shown in table 8:

The high-strength super mobility workability of concrete of table 8 ability

Slump mm	Divergence mm	1h slump-loss mm
			240	550*560	20

2. mechanical property is as shown in table 9

The high-strength super mobility mechanical performance of concrete of table 9

3d ultimate compression strength	7d ultimate compression strength	28d ultimate compression strength	56d ultimate compression strength
				43MPa	75MPa	?92MPa	98MPa

Working method is following:

1, prepares each component by starting material and proportioning requirement;

2, stir according to following the requirement:

1. cement, flyash, silica flour, sand input stir 30s;

2. add stone and water and stir 180s.

3, vibrate according to relevant job specifications;

4, after the form removal, the mode of taking geotextile to cover is at once carried out health, constantly keeps the skin wet in the health process and guarantees the moistening of concrete outside surface, and conditioned time is no less than 7 days.

Claims

1. a HS super mobility concrete is characterized in that, every cubic metre said concrete is by P II 62.5 cement of 390kg; The flyash of 210kg; The silica flour of 25kg, the sand of 650kg, particle diameter are the rubble 1100kg of the continuous grading of 5mm ~ 25mm; The water of 150kg and the high-efficiency water-reducing agent of poly-carboxylic acid of 8.4kg are formed, and the correlated performance parameter of above-mentioned each component is following:

1. the related physical mechanical property of cement is seen table 1:

Table 1P II 62.5 cement physical and mechanical properties

2. flyash correlation technique parameter is seen table:

Table 2 flyash technical parameter

Fineness, 45 μ m square hole sieves Water demand ratio % Loss on ignition % 0.19 102 2.4

3. sand facies pass technical indicator is seen table 3:

Table 3 sand technical indicator

Fineness modulus Silt content % Clod content % 2.54 0.3 0

4. coarse aggregate correlation technique index is seen table 4:

Table 4 crushing technique index

Silt content % Clod content % Faller gill shape granule content % Crush index value % 0.2 0 5.3 5.7

5. the silica flour key index is seen table 5:

Table 5 silica flour key index

Loss on ignition % SiO ₂% Activity index % Water ratio % 1.6 91 21 0.7

Said HS super mobility concrete serviceability is as shown in the table:

Slump mm Divergence mm 1h slump-loss mm 240 550*560 20

Said HS super mobility concrete mechanical property is as shown in the table:

3d ultimate compression strength 7d ultimate compression strength 28d ultimate compression strength 56d ultimate compression strength 43MPa 75MPa 92MPa 98MPa

。