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Single-component regenerated geopolymer cement concrete

A technology of cement concrete and geopolymer, applied in the field of concrete, can solve the problems of low utilization rate, dust pollution, and low resource value of parts with a particle size less than 5mm, and achieve the promotion of hydration and micro-aggregate effect, improvement of activity, The effect of improving resource utilization

Active Publication Date: 2020-08-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the utilization rate of the particle size less than 5mm is low and the resource value is not high, and the screening process will generate a lot of dust pollution
The main components of these mixtures are cement stones, and the main components of cement stones are unhydrated cement particles, calcium hydroxide, calcium silicate hydrate and ettringite, etc., which have a high CaO content and have a high available activity, but it is difficult to use its activity directly due to the coarse particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Note: The amount of alkali activator is calculated according to the mass ratio of the precursor, which is: pozzolanic mineral admixture and regenerated sand / powder mixture;

[0022] Slag, recycled sand / powder mixture, Na 2 SiO 3 After weighing according to the mass ratio of 6.5:3.5:1.3, the slag and the regenerated sand / powder mixture are first ball milled at high speed for 2 hours, and then Na 2 SiO 3 Ball milling for half an hour to prepare single-component recycled geopolymer cement.

[0023] Stir and mix 1 part of single-component recycled geopolymer cement, 0.6 parts of recycled sand / powder mixture, 1.4 parts of standard sand, 0.35 parts of water, and 0.015 parts of water reducing agent to make a test block of 50mm×50mm×50mm. After curing for 1 day under the conditions of humidity above 95% and ambient temperature of 20±2°C, the formwork is removed and placed in water at a temperature of 20±2°C for curing. The strength of the curing age reaches 75.6Mpa after 28...

Embodiment 2

[0025] Fly ash, recycled sand / powder mixture, CaO, Na 2 SiO 3 After weighing according to the mass ratio of 6.5:3.5:0.5:0.8, the fly ash and the regenerated sand / powder mixture are first ball milled at high speed for 2 hours, and then CaO and Na 2 SiO 3 Ball milling for half an hour to prepare single-component recycled geopolymer cement.

[0026] Stir and mix 1 part of single-component recycled geopolymer cement, 0.6 parts of recycled sand / powder mixture, 1.4 parts of standard sand, 0.35 parts of water, and 0.015 parts of water reducing agent to make a test block of 50mm×50mm×50mm. After curing for 1 day under the conditions of humidity above 95% and ambient temperature of 20±2°C, the formwork was removed and placed in water at a temperature of 20±2°C for curing. The strength of the curing age reached 65.3Mpa after 28 days of curing.

Embodiment 3

[0028] Fly ash, slag, recycled sand / powder mixture, Na 2 SiO 3 and Na 2 CO 3 After weighing according to the mass ratio of 4:4.5:1.5:1:0.8, the mixture of fly ash, slag and recycled sand / powder will be ball-milled at high speed for 2 hours, and then the alkali activator Na 2 SiO 3 and Na 2 CO 3 Ball milling for half an hour to prepare single-component recycled geopolymer cement.

[0029] Stir and mix 1 part of single-component recycled geopolymer cement, 1 part of recycled sand / powder mixture, 1 part of standard sand, 0.35 part of water, and 0.02 part of water reducer to make a test block of 50mm×50mm×50mm, in the relative After curing for 1 day under the conditions of humidity above 95% and ambient temperature of 20±2°C, the formwork was removed and placed in water at a temperature of 20±2°C for curing. The strength of the curing age reached 63.9Mpa after 28 days of curing.

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Abstract

The invention belongs to the technical field of concrete, and particularly relates to single-component regenerated geopolymer cement concrete. The concrete comprises following raw materials: recycledgeopolymer cement, water, natural fine aggregate, a recycled sand / powder mixture, coarse aggregate and an additive. The single-component geopolymer regenerated cement is prepared by mixing a volcanicash mineral admixture (such as fly ash and slag), the regenerated sand / powder mixture and a solid alkali activator and then carrying out ball milling. The geopolymer regenerated cement is produced byactivating the activity of the regenerated sand / powder mixture and the volcanic ash mineral admixture (such as fly ash, slag and meta-kaolin) by utilizing the mechanochemical action in the ball milling process. The regenerated sand / powder mixture is adopted to replace part of fine aggregate to produce the regenerated geopolymer cement concrete, so that the recycling value and the recycling rate ofthe regenerated sand / powder mixture are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a single-component recycled geopolymer cement concrete. Background technique [0002] Recycling of construction waste is the only way for the sustainable development of the construction industry. Crushing waste concrete into recycled coarse aggregate for the production of recycled concrete products is the main resource of waste concrete. The production of recycled coarse aggregate will be accompanied by A large amount of recycled fine aggregate and recycled powder mixture (referred to as recycled sand / powder mixture in this patent), the current application of this part is generally to use the 0.15-5mm part as recycled fine aggregate, and partially replace the natural sand after washing. Aggregate is used to produce medium and low-strength recycled concrete, and its replacement rate is usually about 20%. The part below 0.15mm is generally used for landfill. Some studies believe t...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/006C04B2201/50C04B18/141C04B18/16C04B12/04C04B14/06C04B2103/302C04B18/08C04B22/064C04B22/10Y02P40/10
Inventor 王雪芳吴文达
Owner FUZHOU UNIV
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