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Cement-based material carbon sequestration internal curing agent as well as preparation and application thereof

A technology of cement-based materials and curing agents, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as high cost, insufficient maintenance effect, and few types

Active Publication Date: 2021-06-01
HUALAN DESIGN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, judging from the types and effects of the current internal curing agents, there are still problems such as high cost, few types, and insufficient curing effects.

Method used

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  • Cement-based material carbon sequestration internal curing agent as well as preparation and application thereof
  • Cement-based material carbon sequestration internal curing agent as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a cement-based material carbon-fixing internal curing agent, the specific steps are as follows:

[0025] (1) Preparation of biochar: Using waste wood as raw material, the wood was cut into cubes, pre-dried in a room with a temperature of 22 °C and a relative humidity of 65%, and then placed in a temperature-controlled muffle furnace for heating. Then, the temperature was raised to 500°C at 10°C / min and then kept for 2 hours to completely carbonize it into biochar, and it was taken out after cooling.

[0026] (2) Biochar modification: block biochar was soaked in saturated lime aqueous solution for 24 h, dried in an oven at 95 °C, and then ground with a flying knife mill for 4 min to obtain modified biochar powder particles.

[0027] The modified biochar powder particles obtained above were mixed into cement mortar with a water-cement ratio of 0.4 instead of 1% cement by mass. Compared with pure cement mortar without internal curing agent, the comp...

Embodiment 2

[0029] A preparation method of a cement-based material carbon-fixing internal curing agent, the specific steps are as follows:

[0030] (1) Preparation of biochar: Using waste wood as raw material, the wood was cut into cubes, pre-dried in a room with a temperature of 22 °C and a relative humidity of 65%, and then placed in a temperature-controlled muffle furnace for heating. Then, the temperature was raised to 700°C at 10°C / min and then kept for 2 hours to completely carbonize it into biochar, and it was taken out after cooling.

[0031] (2) Biochar modification: block biochar was soaked in saturated lime aqueous solution for 48 h, dried in an oven at 95 °C, and then ground with a flying knife mill for 4 min to obtain modified biochar powder particles.

[0032] The modified biochar powder particles obtained above were mixed into cement mortar with a water-cement ratio of 0.5 instead of 5% cement by mass. The flexural strength is increased by 2%, and the autogenous shrinkage ...

Embodiment 3

[0034] A preparation method of a cement-based material carbon-fixing internal curing agent, the specific steps are as follows:

[0035] (1) Preparation of biochar: Using waste wood as raw material, the wood was cut into cubes, pre-dried in a room with a temperature of 22 °C and a relative humidity of 65%, and then placed in a temperature-controlled muffle furnace for heating. Then, the temperature was raised to 500°C at 10°C / min and then kept for 2 hours to completely carbonize it into biochar, and it was taken out after cooling.

[0036] (2) Biochar modification: block biochar was soaked in NaOH solution with a mass concentration of 1% for 24 hours, dried in an oven at a temperature of 95°C, and then ground with a flying knife mill for 4 minutes to obtain a modified biochar. Charcoal powder particles.

[0037] The modified biochar powder particles obtained above were mixed into cement mortar with a water-cement ratio of 0.5 instead of 3% cement by mass. Compared with pure ce...

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Abstract

The invention discloses a cement-based material carbon sequestration internal curing agent as well as preparation and application thereof. The internal curing agent is modified biochar or a compound of the modified biochar and light aggregate and / or super absorbent resin; and the modified biochar is biochar powdery particles obtained by soaking biochar obtained by pyrolyzing biomass under high-temperature and oxygen-limited conditions in an alkaline solution, drying and grinding. The rich pore structure and the strong hydrophilic performance of the biochar enable the biochar to achieve the internal curing effect of the cement-based material, and the good stability can ensure the long-term and stable development of the performance of the cement-based material; the biochar is sealed in the cement-based material, so that the release of CO2 can be reduced, and the effects of carbon sequestration and emission reduction are achieved; and the biochar modified by the aqueous alkali can make the cement more fully hydrated, and when the biochar is matched with the lightweight aggregate and / or the super absorbent resin for use, the internal curing effect is stronger. After the internal curing agent provided by the invention is doped, the compressive strength and bending strength of the cement-based material at the age of 28 days are improved, and the self-constriction is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of modification of cement-based materials, in particular to a carbon-fixing internal curing agent for cement-based materials and its preparation and application. Background technique [0002] Concrete and mortar are common cement-based building materials in the field of engineering. Relevant scholars are committed to improving the performance of cement-based materials to adapt to complex and changeable external environments. However, due to the low water glue and high sand ratio of high-performance concrete and mortar, the internal moisture is difficult to fully meet the cement hydration requirements, and the compact structure also prevents the entry of external moisture, which causes internal self-drying, shrinkage cracks, and affects cement-based materials. strength and durability. Existing studies have shown that 1 g of cement binds approximately 0.23 g of chemically bound water and 0.19 g of gel water w...

Claims

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Application Information

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IPC IPC(8): C04B22/06C04B28/02
CPCC04B40/0039C04B28/02C04B14/022C04B22/064C04B22/062Y02W30/91
Inventor 杜泰阳谭康豪胡刚李华尧孙元及申晓宝庞春美
Owner HUALAN DESIGN GRP CO LTD
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