Mass eco-concrete expansive agent and preparation method thereof

A technology of mass concrete and expansion agent, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as the gap in expansion process, achieve controllable expansion amount, simple and easy preparation process, and expansion Stable performance

Active Publication Date: 2011-06-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of expandant used during building constructions helps prevent cracks caused from water damage or other factors that could cause them over time. It does this through dual-expansion with controlled properties like volume change rates at both ends (controlled length). Additionally, there are options available depending on how much space needs to accommodated within each part being constructed.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving expanders such as gypsum based ones during curative processes due to rapid increase in contraction temperatures caused by high levels of moisture content inside the hardened material. Existing methods have limitations in terms of achieving sufficient expansion without cracks forming over time, leading to decreased strength and reduced longevity compared to new designs made through casting techniques.

Method used

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  • Mass eco-concrete expansive agent and preparation method thereof
  • Mass eco-concrete expansive agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) A new type of ecological large-volume concrete expansion agent includes the following components in parts by weight:

[0027] Component 1: magnesite tailings, 100 parts;

[0028] Component 2: dolomite tailings, 0 parts;

[0029] (2) Preparation of a new type of ecological mass concrete expansion agent

[0030] 1) Pass the ore through a 0.63mm square hole sieve and perform pretreatment, after crushing, grind it and pass it through an 80μm square hole sieve, and the sieve residue is less than 10%;

[0031] 2) Mix magnesite tailings and dolomite tailings in a ratio of 1:0 to make a raw meal, mix well, dry at 110°C for 1 hour, and then calcine the powder at high temperature;

[0032] 3) The calcination temperature is set at 950°C, the calcination time is 119min, the holding time is 90min, and the heating rate is 8°C / min.

[0033] 4) After cooling in the air, a new type of ecological large-volume concrete expansion agent A can be obtained after screening.

[0034]

Embodiment 2

[0036] (1) A new type of ecological large-volume concrete expansion agent includes the following components in parts by weight:

[0037] Component 1: magnesite tailings, 80 parts;

[0038] Component 2: dolomite tailings, 20 parts;

[0039] (2) Preparation of a new type of ecological mass concrete expansion agent

[0040] 1) Pass the ore through a 0.63mm square hole sieve and perform pretreatment, after crushing, grind it and pass it through an 80μm square hole sieve, and the sieve residue is less than 10%;

[0041] 2) Mix magnesite tailings and dolomite tailings into raw material according to the ratio of 4:1, mix evenly, dry at 110°C for 1 hour, and then calcine the powder at high temperature;

[0042] 3) The calcination temperature is set at 1050°C, the calcination time is 117min, the holding time is 90min, and the heating rate is 9°C / min.

[0043] 4) After cooling in the air, a new type of ecological large-volume concrete expansion agent B can be obtained through sieving...

Embodiment 3

[0046] (1) A new type of ecological large-volume concrete expansion agent includes the following components in parts by weight:

[0047] Component 1: magnesite tailings, 25 parts;

[0048] Component 2: dolomite tailings, 75 parts;

[0049] (2) Preparation of a new type of ecological mass concrete expansion agent

[0050] 1) Pass the ore through a 0.63mm square hole sieve and perform pretreatment. After crushing and grinding, pass through an 80μm square hole sieve, and the sieve residue is less than 10%;

[0051] 2) Mix magnesite tailings and dolomite tailings into raw material according to the ratio of 1:3, mix evenly, dry at 120°C for 1 hour, and then calcine the powder at high temperature;

[0052] 3) The calcination temperature is set at 1150°C, the calcination time is 115min, the holding time is 90min, and the heating rate is 10°C / min.

[0053] 4) After cooling in the air, a new type of ecological large-volume concrete expansion agent C can be obtained through sieving. ...

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Abstract

The invention relates to a mass eco-concrete expansive agent and a preparation method thereof. The method comprises the following preparation steps: sieving ores, pretreating, crushing to grind; using magnesite tailing and dolomite tailing to prepare raw material, mixing evenly, calcining at high temperature; and cooling in the air, and sieving to obtain the mass eco-concrete expansive agent. In the preparation method of the invention, CaO can be used as the early expansion source to compensate early shrinkage and overcome the defects of hydraulic concrete, namely high admixture and insufficient CaO; MgO can be used as the later expansion source to compensate later shrinkage; and magnesite tailing and dolomite tailing are combined reasonably to calcine, thus reducing and compensating the early and later expansions of hydraulic mass concrete.

Description

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Claims

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Application Information

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Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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