Geo-polymer recycled concrete and preparation method thereof

A technology of geopolymer and recycled concrete, applied in the field of construction, to protect the environment, reduce production energy consumption and resource consumption, and save land

Inactive Publication Date: 2009-11-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because the mix design method and preparation process of ordinary concrete are no longer suitable for geopolymer recycled concrete, the present invention proposes a mix ratio and its preparation method specially used for geopolymer recycled concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: Geopolymer recycled concrete is prepared by the following weight ratio: recycled coarse aggregate 100, recycled fine aggregate 40, fly ash 10, slag powder 10, water 10, sodium silicate 0.8, sodium hydroxide 2.8 , naphthalenesulfonate formaldehyde condensate 0.06, calcium sucrose 0.01. The prepared geopolymer recycled concrete has a slump of 13cm, an initial setting time of 6h25min, a final setting time of 7h40min, a 3d compressive strength of 22.5MPa after hardening, a 28d compressive strength of 31.2MPa, and an impermeability grade of P12. After soaking in 5% HCl for 3 months, the strength loss rate is 12%, and the thermal conductivity is 2.3W / m·K.

Embodiment 2

[0049]Embodiment 2: Geopolymer recycled concrete is prepared according to the following weight ratio: recycled coarse aggregate 100, recycled fine aggregate 80, fly ash 35, slag powder 40, water 18, sodium silicate 2.5, sodium hydroxide 2.8 , naphthalenesulfonate formaldehyde condensate 0.15, calcium sucrose 0.04. The prepared geopolymer recycled concrete has a slump of 24cm, an initial setting time of 8h05min, a final setting time of 11h10min, a 3d compressive strength of 53.5MPa after hardening, a 28d compressive strength of 68.6MPa, and an impermeability grade of P18. After soaking in 5% HCl for 3 months, the strength loss rate is 0.2%, and the thermal conductivity is 2.4W / m·K.

Embodiment 3

[0050] Embodiment 3: Geopolymer recycled concrete is prepared according to the following weight ratio: recycled coarse aggregate 100, recycled fine aggregate 70, fly ash 25, slag powder 20, water 16, sodium silicate 1.7, sodium hydroxide 0.8 , naphthalenesulfonate formaldehyde condensate 0.09, calcium sucrose 0.02. The prepared geopolymer recycled concrete has a slump of 19cm, an initial setting time of 7h25min, a final setting time of 9h35min, a 3d compressive strength of 47.2MPa after hardening, a 28d compressive strength of 56.0MPa, and an impermeability grade of P17. After soaking in 5% HCl for 3 months, the strength loss rate is 2.3%, and the thermal conductivity is 2.3W / m·K.

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Abstract

The invention belongs to the fields of civil engineering and environmental material engineering, and in particular relates to geo-polymer recycled concrete and a preparation method thereof. The geo-polymer recycled concrete is prepared from raw materials of recycled coarse aggregate, recycled fine aggregate, fly ash, slag powder, water, sodium silicate, sodium hydrate, naphthalene sulfonate formaldehyde condensation compound and calcium saccharate according to certain mixing proportion by adopting a special stirring process. The product of the geo-polymer recycled concrete not only has simple preparation process, but also has good working performance, mechanical property, durability and heat-insulating property. Simultaneously, the geo-polymer recycled concrete and the preparation method can efficiently use a great deal of waste concrete and two industrial byproducts of the fly ash and blast furnace slag, are significant in saving resources, saving energy sources and protecting the environment, and accord with the sustainable development strategy of the building industry. The product of the geo-polymer recycled concrete can be widely applicable to road engineering, structural engineering and other various civil engineering constructions.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a geopolymer recycled concrete and a preparation method thereof. Background technique [0002] Geopolymers include all three-dimensional network gels with amorphous and quasi-crystalline characteristics that are prepared from natural minerals or industrial solid wastes and are aggregated with silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons. The preparation of geopolymers can not only utilize natural minerals (such as coal gangue, kaolin, etc.) Low permeability, acid corrosion resistance, high temperature resistance, low thermal conductivity, good durability and other characteristics have attracted extensive attention from the construction industry. In addition, the energy consumption of this new type of material is only 30% of the energy consumption of cement production. A good complementary and alternative material. [0003] Fly ash and water-quen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/08C04B18/16
CPCC04B28/008C04B2111/0075Y02P40/10Y02W30/91C04B18/067C04B18/08C04B18/16C04B20/0096C04B24/10C04B24/226C04B40/0028
Inventor 肖建庄孙振平
Owner TONGJI UNIV
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