Premixed concrete mix proportion design method

A technology of ready-mixed concrete and mix ratio design, applied in the field of ready-mixed concrete, can solve the problems of high cementitious material consumption, uneconomical, concrete segregation, bleeding, etc., and achieve the effect of simple method and strong applicability

Pending Publication Date: 2019-11-26
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The standard mix ratio design method is not suitable for the actual production of commercial concrete enterprises, which may easily lead to unreasonable amount of cementitious materials, too little cementitious materials for medium and low-strength concrete, and ready-mixed large-fluid concrete is prone to segregation and bleeding , affecting the homogeneity of concrete; the amount of high-strength concrete cementitious material is too high, which is not economical and increases concrete shrinkage
Affects durability
There is no relationship between water consumption per unit volume and the quality of admixtures and aggregates; the selection and determination of sand ratio are not suitable for modern large-flow concrete

Method used

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  • Premixed concrete mix proportion design method
  • Premixed concrete mix proportion design method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Requirements: Prepare C30 concrete, double-mixed with fly ash and slag powder, and the slump is above 180mm. Raw materials:

[0086] Cement: P.O42.5, apparent density 3050kg / m 3 ; Fly ash grade Ⅱ, apparent density 2200kg / m 3 ,

[0087] Slag: fluidity ratio 100%, apparent density 2900kg / m 3 .

[0088] Artificial sand: fineness modulus M X =2.8, sand in Zone II. Stone powder content 4%. Apparent density 2650kg / m 3 . The stone content is 6%, and the flake particle content is 8%.

[0089] Stone: crushed pebbles, close-packed porosity of 39%, needle flake content of 5%. Apparent density 2700kg / m 3 .

[0090] Water reducing agent: naphthalene series, solid content 31.5%.

[0091] calculation steps:

[0092] S1) Select the composition of the gelling material and the ratio of water to cement

[0093] The cementitious material is composed of 45% cement, 20% fly ash and 35% mineral powder. The water-binder ratio is selected as 0.45.

[0094] The water demand rati...

Embodiment 2

[0114] Requirements: Prepare C30 concrete, double-mixed with fly ash and slag powder, and the slump is above 180mm. Raw materials: cement: P.O42.5, apparent density 3050kg / m 3 , Class II fly ash, apparent density 2200kg / m 3 , slag fluidity ratio 100%, apparent density 2900kg / m 3 .

[0115] Artificial sand: fineness modulus M X =3.3, coarse sand in Zone I. Stone powder content 9%, MB value 0.75. Apparent density 2650kg / m 3 . The stone content is 30%, and the flake particle content is 23%.

[0116] Stone: crushed pebbles, closely packed porosity rate is 43%, and needle flake content is 6%. Apparent density 2700kg / m 3 .

[0117] Water reducing agent: naphthalene series, solid content 31.5%.

[0118] calculation steps:

[0119] S1) Select the composition of the gelling material and the ratio of water to cement

[0120] The cementitious material is composed of 45% cement, 20% fly ash and 35% mineral powder. The water-binder ratio is selected as 0.45. The water demand...

Embodiment 3

[0143] Requirements: Prepare C50 concrete, mixed with fly ash alone, and the slump is above 200mm.

[0144] Raw materials: cement: P.O42.5, apparent density 3050kg / m 3 , Class II fly ash, apparent density 2200kg / m 3 .

[0145] River sand: fineness modulus M X =2.4, sand in Zone II. The mud content is 7%. Apparent density 2650kg / m 3 . Stone content 5%.

[0146] Stone: crushed pebbles, close-packed porosity of 44%, needle flake content of 5%. Apparent density 2700kg / m 3 .

[0147] Water reducer: polycarboxylate high-efficiency water reducer, with a solid content of 15%

[0148] calculation steps:

[0149] S1) Select the composition of the gelling material and the ratio of water to cement

[0150] The cementitious material consists of 70% cement, 30% fly ash, and a water-binder ratio of 0.32. The water demand ratio of the gelled material was determined to be 98%.

[0151] S2) Calculate the amount of gelling material

[0152] Calculation of the amount of gelling mat...

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Abstract

The invention provides a premixed concrete mix proportion design method which is characterized in that the water-binder ratio is selected after the composition of a cementing material is determined according to the requirements of concrete engineering, and a cementing material calculation formula is provided to calculate the dosage of the cementing material; after the stone volume is selected, andthe sand consumption is calculated by using an absolute volume method. The method has the advantages that on the premise that the workability of concrete is guaranteed, the consumption (water consumption) of cementing materials of concrete of different grades is reasonably controlled, and it is emphasized that concrete powder of the high-strength grade is not too much, and the low-strength-gradeconcrete powder is not suitable to be too little. On the basis of guaranteeing the good performance of the mixture, the technical goals of low unit volume water consumption, low cement consumption andlow water-binder ratio are pursued. The method is simple and scientific, and has strong applicability to actual production of concrete.

Description

technical field [0001] The invention relates to the field of ready-mixed concrete, in particular to a mixing ratio design method suitable for multi-component large-fluid ready-mixed concrete. Background technique [0002] With the continuous advancement of high-efficiency water reducer technology, large-flow ready-mixed concrete has become the main body of modern concrete. For multi-component concrete, the mix ratio design code revises Paul Mi's formula on the basis of the previous four-component concrete mix design, but still does not get rid of the design idea of ​​strength as the main line. The standard mix ratio design method is not suitable for the actual production situation of commercial concrete enterprises, which may easily lead to unreasonable dosage of cementitious materials, too little cementitious materials for medium and low-strength concrete, and ready-mixed large-fluid concrete is prone to segregation and bleeding , affecting the homogeneity of concrete; the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18C04B28/04
CPCC04B28/04G06F17/18C04B18/08C04B18/141C04B14/06C04B14/02C04B2103/302C04B14/068
Inventor 宋少民刘娟红邝云辉王伟涛何伟卞立波王林
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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