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A kind of high toughness concrete with high workability and preparation method thereof

A technology with high workability and high toughness, applied in the field of building materials, can solve the problems of high compressive strength, poor workability and toughness, etc., and achieve the effect of improving toughness, strength and good adaptability

Active Publication Date: 2019-05-17
SHANGHAI CONSTRUCTION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high toughness concrete with high workability and its preparation method, which is used to solve the problem of high compressive strength of existing high performance and ultra high performance concrete, but poor workability and toughness

Method used

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  • A kind of high toughness concrete with high workability and preparation method thereof
  • A kind of high toughness concrete with high workability and preparation method thereof
  • A kind of high toughness concrete with high workability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The unilateral dosage ratio of each component of high toughness concrete with high workability (kg / m 3 )As shown in Table 1. The ratio of unilateral dosage refers to 1m 3 The weight ratio of each component in high toughness concrete with high workability.

[0026] Table 1 Proportion of high toughness concrete with high workability (kg / m 3 )

[0027] cement

microwire steel fiber

Silica fume

Middle sand

Admixture

water

1000

250

50

1000

30

185

[0028] Preparation method:

[0029] Prepare high toughness concrete with high workability according to the formula in Table 1, including the following steps:

[0030] Step 1. Add cement, sand and silica fume into the mixer, and stir for 30s;

[0031] Step 2: Add additives and water, and stir for 240s;

[0032] Step 3: Add microwire steel fibers and stir for 30 seconds to complete the preparation of high toughness concrete with high workability.

[0033] After testing, t...

Embodiment 2

[0036] The unilateral dosage ratio of each component of high toughness concrete with high workability (kg / m 3 )As shown in table 2.

[0037] Table 2 has the ratio of high toughness concrete with high workability (kg / m 3 )

[0038] cement

microwire steel fiber

Silica fume

Middle sand

Admixture

water

1500

200

60

800

35

200

[0039] The method for preparing high-toughness concrete with high workability according to the formula in Table 2 is the same as that of Example 1, and will not be repeated here.

[0040] After testing, the workability and mechanical properties of the high workability high toughness concrete prepared according to the above method are as follows:

[0041]

Embodiment 3

[0043] The unilateral dosage ratio of each component of high toughness concrete with high workability (kg / m 3 )as shown in Table 3.

[0044] Table 3 Proportion of high toughness concrete with high workability (kg / m 3 )

[0045] cement

microwire steel fiber

Silica fume

Middle sand

Admixture

water

600

300

40

1200

25

175

[0046] The method for preparing high-toughness concrete with high workability according to the formula in Table 3 is the same as that of Example 1, and will not be repeated here.

[0047] After testing, the workability and mechanical properties of the high workability high toughness concrete prepared according to the above method are as follows:

[0048]

[0049] control group

[0050] cement

RPC special end hook steel fiber

Silica fume

Middle sand

Ordinary superplasticizer

water

1000

250

250

1100

30

250

[0051] After testing, the working perfo...

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Abstract

The invention discloses a high-workability high-toughness concrete and a preparation method thereof, belonging to the technical field of construction materials. The invention aims to solve the problems of low toughness and poor workability in the existing ultrahigh-performance concrete. The high-workability high-toughness concrete is prepared from cement, high-strength fibers, a nano material, medium sand, an additive and water according a certain proportion at normal temperature. A calcium silicate hydrate gel solution water reducing agent introduced as the additive effectively increases the early strength of the high-workability high-toughness concrete, enhances the binding degree between the fibers and mortar matrix and enhances the binding effects, thereby effectively enhancing the concrete ductility. Besides, the high-toughness concrete has the characteristics of lower nano material doping amount and low water consumption, thereby being beneficial to enhancing the concrete strength. The additive has the advantages of controllable doping amount and favorable adaptability to the nano material, so the concrete has the advantages of low viscosity, low isolation tendency, favorable flowability, favorable stability and favorable plasticity.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-toughness concrete with high workability and a preparation method thereof. Background technique [0002] The research and application of ultra-high performance concrete materials based on the principle of RPC preparation is one of the main directions for the development of cement-based materials today. For quite a long time to come, China is still in a period of large-scale construction. With the continuous improvement of energy conservation, emission reduction and sustainable development requirements, the requirements for concrete performance will also be higher and higher. Therefore, ultra-high performance concrete (UHPC) has Broad application prospects. Although the existing high-performance and ultra-high-performance concrete can greatly increase the compressive strength of concrete, they generally have poor workability and low toughness. Concrete is a bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B22/08C04B14/48
CPCC04B28/04C04B2201/50C04B14/48C04B18/146C04B14/06C04B22/08
Inventor 许永和王圣怡徐俊周云
Owner SHANGHAI CONSTRUCTION GROUP
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