Design method for mixing proportion of self-compacting concrete mixture

A technology of self-compacting concrete and mix ratio design, applied in calculation, special data processing applications, instruments, etc., can solve the problems of unpredictable mixture performance, increased workload of trial mix adjustment, waste of resources, etc.

Active Publication Date: 2016-01-06
ZHENGZHOU UNIV
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  • Claims
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Problems solved by technology

Although the packing theory has been studied and applied in the concrete industry for many years, so far, there is no set of practical methods for determining the mix ratio of self-compacting high-performance concrete based on this theory, let alone the material of the mix. The composition is directly related to the self-compacting performance level. For example, the Chinese patent (application publication number CN103304206A) discloses a super-high-strength self-compacting concrete and its preparation method. Composed of cement, water and PVA fiber, the mass percentages of cement, slag and silica fume that make up the cementitious material are: cement 70%-80%, slag 10%-20%, silica fume 5%-10%
Although the invention mentions the optimal...

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  • Design method for mixing proportion of self-compacting concrete mixture
  • Design method for mixing proportion of self-compacting concrete mixture
  • Design method for mixing proportion of self-compacting concrete mixture

Examples

Experimental program
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Embodiment 1

[0161] In this embodiment, the proportion design of the C50 self-compacting concrete mixture is taken as an example, and the method for designing the proportion of the self-compacting concrete mixture specifically includes the following steps.

[0162] (1) Determine performance design goals

[0163] Specifically, this embodiment is a common reinforced concrete structure project, and the net distance between steel bars is 80-100 mm. Based on this, three kinds of mixtures of self-compacting performance levels are designed (the self-compacting performance of the mixture is expressed by the degree of slump expansion respectively The mix ratio of self-compacting concrete that reaches the three levels of SF1, SF2 and SF3), with the 28d compressive strength of 50MPa (standard cubic specimen) prepared with the same material as the standard, the strength level of self-compacting concrete is also required to reach 50MPa; at the same time, it is required to mix Good compound expansion ti...

Embodiment 2

[0301] In this example, the ratio of the self-compacting concrete mixture whose strength level is C60 is determined as an example. The raw materials are basically the same as in Example 1, except that the aggregate is determined according to five continuous grading curves calculated by the Fuller-Talbol formula. Firstly, the single-size particles obtained by sieving are combined to obtain the aggregate mixture satisfying five gradation curves, and then the aggregate gradation satisfying the closest packing state is determined through the bulk density test, and the mix ratio of the mixture is determined. Proceed as follows:

[0302] (1) Determine the preparation strength and water-binder ratio of self-compacting concrete

[0303] Calculation of Self-Compacting Concrete Preparation Strength f cu，0 : f cu，0 =1.15×6.0=69.0MPa;

[0304] The replacement rate of fly ash is still 20%, and the design strength of the cementitious material f b as follows:

[0305] ;

[0306] C...

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Abstract

The present invention belongs to the technical field of concrete construction and particularly relates to a design method for a mixing proportion of a self-compacting concrete mixture. The method comprises the steps of: determining a performance design target; determining mixing strength and a water-binder ratio; determining densest gradation (or a sand rate) of aggregates and void ratios of different packing states; determining the usage amount of binding materials and mixing water; determining the usage amount of the aggregates; determining the usage amount of additives; determining the actual adding amount of the mixing water; and the like. According to the method provided by the present invention, aimed at blindness of material selection during self-compacting concrete mixing proportion design in the prior art, based on a fundamental theory of particulate dense packing and a composition rule of reaching a densest packing state of solid particulate materials with different particulate diameters, a mixing proportion of different materials is determined by an actually measured densest packing state, and relationships are established between the material mixing proportions corresponding to different densest packing states and expected self-compacting performance grades of the mixture, so that the design method used for the mixing proportion of the self-compacting high-performance concrete mixture and based on a use performance as a target is constructed.

Description

technical field [0001] The invention belongs to the technical field of concrete construction and relates to a method for designing the mixing ratio of self-compacting concrete mixture. Background technique [0002] Self-compacting concrete is a new type of high-performance concrete that has high fluidity at low water-binder ratio without segregation and bleeding, and ensures that it can fill the mold cavity and wrap steel bars by itself without vibration under unfavorable pouring conditions. Due to the use of a large amount of industrial waste mineral fine admixtures, self-compacting concrete can significantly reduce the temperature rise of concrete, thereby improving the ability to resist external environmental erosion and deterioration, thereby improving the durability of the concrete structure; at the same time, the use of mineral fine admixtures saves cement, Reduced carbon emissions and energy consumption in cement production. Due to the above advantages, self-compacti...

Claims

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Application Information

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IPC IPC(8): G06F17/50C04B28/04
Inventor 汤寄予高丹盈赵军陈刚陈瑞龙徐俊娟金星崔来浩
Owner ZHENGZHOU UNIV
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