Machine-made sand and aeolian sand co-doped ultra-high performance concrete and preparation method thereof

An ultra-high performance, machine-made sand technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high stone powder content, large fineness modulus, irregular shape, etc. Cost, good performance, effect of improving flow properties

Inactive Publication Date: 2020-08-14
CHINA RAILWAY BRIDGE SCI RES INST LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles of aeolian sand are small and uniform, and the fineness modulus is small. As a fine aggregate, it is not suitable to be used in concrete alone. The reasonable combination of aeolian sand and machine-made sand can improve the particle gradation of fine aggregate and affect the flow of concrete. The performance can be promoted, but the viscosity and water retention of aeolian sand are poor, and the strength of concrete will be affected if the amount is too high. It is necessary to strictly control the amount of aeolian sand and match it with machine-made sand in an appropriate proportion to prepar

Method used

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  • Machine-made sand and aeolian sand co-doped ultra-high performance concrete and preparation method thereof
  • Machine-made sand and aeolian sand co-doped ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The ultra-high performance concrete mixed with machine-made sand and aeolian sand prepared in this example has the ratio of raw materials as shown in Table 1:

[0031] Table 1 Ultra-high performance concrete mixed with machine-made sand and aeolian sand (kg / m 3 )

[0032] cement mineral admixture Machine-made sand Aeolian sand Superplasticizer steel fiber water 700 400 800 200 13.7 150 198

[0033] (1) As shown in Table 1, weigh 700 parts by weight of cement, 400 parts by weight of mineral admixture, 800 parts by weight of machine-made sand, 200 parts by weight of aeolian sand, 150 parts by weight of steel fiber, 13.7 parts by weight of water reducing agent and 198 parts by weight of water;

[0034] (2) Stir the cement, mineral admixture, machine-made sand and aeolian sand, steel fiber and water reducer evenly in a vertical planetary forced mixer for 3 minutes;

[0035] (3) Add all the water and stir for 4 minutes. After the concret...

Embodiment 2

[0039] The ultra-high performance concrete mixed with machine-made sand and aeolian sand prepared in this example has the ratio of raw materials as shown in Table 2:

[0040] Table 2 Ultra-high performance concrete mixed with machine-made sand and aeolian sand (kg / m 3 )

[0041] cement mineral admixture Machine-made sand Aeolian sand Superplasticizer steel fiber water 850 300 600 300 12.2 200 205

[0042] (1) As shown in Table 2, weigh 850 parts by weight of cement, 300 parts by weight of mineral admixture, 600 parts by weight of machine-made sand, 300 parts by weight of aeolian sand, 200 parts by weight of steel fiber, 12.2 parts by weight of water reducing agent and 205 parts by weight of water;

[0043] (2) Stir the cement, mineral admixture, machine-made sand and aeolian sand, steel fiber and water reducer evenly in a vertical planetary forced mixer for 3 minutes;

[0044] (3) Add all the water and stir for 4 minutes. After the concret...

Embodiment 3

[0048] The ultra-high performance concrete mixed with machine-made sand and aeolian sand prepared in this example has the ratio of raw materials as shown in Table 3:

[0049] Table 3 Ultra-high performance concrete mixed with machine-made sand and aeolian sand (kg / m 3 )

[0050] cement mineral admixture Machine-made sand Aeolian sand Superplasticizer steel fiber water 750 350 700 250 13.2 200 193

[0051] (1) As shown in Table 3, weigh 750 parts by weight of cement, 350 parts by weight of mineral admixture, 700 parts by weight of machine-made sand, 250 parts by weight of aeolian sand, 200 parts by weight of steel fiber, 13.2 parts by weight of water reducing agent and 193 parts by weight of water;

[0052] (2) Stir cement, mineral admixture, fine aggregate, aeolian sand, steel fiber and water reducer evenly in a vertical shaft planetary forced mixer for 3 minutes;

[0053] (3) Add all the water and stir for 4 minutes. After the concrete is...

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Abstract

The invention relates to machine-made sand and aeolian sand co-doped ultra-high performance concrete and a preparation method thereof. The content per cube of the machine-made sand and aeolian sand co-doped ultra-high performance concrete comprises: 650 to 850 kg/m<3> of cement, 300 to 450 kg/m<3> of a mineral admixture, 600 to 800 kg/m<3> of machine-made sand, 200 to 400 kg/m<3> of aeolian sand,78 to 220 kg/m<3> of steel fiber, 11.2 to 14.2 kg/m<3> of a water reducing agent and 185 to 210 kg/m<3> of water. The machine-made sand and the aeolian sand are adopted to replace natural river sand,the prepared machine-made sand and aeolian sand co-doped ultra-high performance concrete has good working performance, mechanical performance and durability, the problem of shortage of natural river sand resources is solved, local resources are reasonably utilized, and the production cost is reduced.

Description

technical field [0001] The application belongs to the technical field of building materials, and in particular relates to an ultra-high-performance concrete compounded with machine-made sand and aeolian sand and a preparation method thereof. Background technique [0002] Due to the advantages of ultra-high strength, ultra-high toughness, and ultra-high durability, ultra-high performance concrete (UHPC) has been gradually used in bridges, roads, municipalities, nuclear power plants, ports, and military projects since it was developed in the 1990s. , is currently the key research object of researchers in the industry, but there is little research on the application of ultra-high performance concrete in the western region where natural river sand is scarce. [0003] With the continuous development of railway construction to the central and western regions, the natural river sand used as an ideal fine aggregate for concrete in the western region of my country is becoming more an...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/28C04B14/06C04B18/08
CPCC04B28/04Y02W30/91
Inventor 李信陈露一黄有强张志豪郑丽
Owner CHINA RAILWAY BRIDGE SCI RES INST LTD
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