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A kind of calcium carbide slag-based micro-expansion agent and preparation method thereof

A technology of micro-expansion agent and calcium carbide slag, which is applied in the field of calcium carbide slag-based micro-expansion agent and its preparation, can solve the problem that the expansion agent does not have expansibility, etc., and achieve the effects of reduced cost, low cost and easy availability of raw materials

Active Publication Date: 2022-05-24
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a calcium carbide slag-based micro-expansion agent and its preparation method to solve the technical problem that the existing expansion agent does not have relatively sustained expansion

Method used

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Embodiment Construction

[0032] In order to better understand the present invention, a calcium carbide slag-based micro-expansion agent of the present invention and a preparation method thereof will be described in further detail below.

[0033] To prepare 1000g calcium carbide slag-based micro-expansion agent, the required materials and proportions are as follows:

[0034] Carbide slag 733g, coal gangue 131g, fly ash 91g, desulfurization gypsum 30g, sucrose 5g, polylactic acid 10g.

[0035] Carbide slag, coal gangue, fly ash, and desulfurized gypsum pass through a 200-mesh square-hole sieve, and the sieve balance is less than 5%.

[0036] Carbide slag is calcium carbide slag produced in Ulanqab City; the coal gangue is high-alumina coal gangue produced in Ordos area; the fly ash is solid waste produced in Ordos area; the desulfurization gypsum is produced by power plants in Ordos area solid waste.

[0037] The CaO content in the carbide slag is 69%, the loss on ignition is 30%, and the Al in the co...

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Abstract

A calcium carbide slag-based micro-expansion agent of the present invention and a preparation method thereof, the micro-expansion agent contains CaO, active Al 2 o 3 , Calcium sulfate, when added to cement-based cementitious materials, the first is Al 2 o 3 , Calcium sulfate reacts with CaOH to form ettringite with micro-swellability, which makes the gelling material have micro-swellability in the early stage; after that, the polylactic acid wrapped by CaO is degraded in alkaline environment, and CaO reacts with water to form ettringite with micro-swellability. Slightly expansive CaOH makes the cementitious material system have more continuous expansibility; polylactic acid is a high molecular polymer that degrades in an alkaline environment, and it plays a role in delaying the hydration of CaO in the expansive agent , sucrose has the function of regulating hydration, and the gelling material system has better micro-swellability under the compound regulation effect of polylactic acid and sucrose.

Description

technical field [0001] The invention belongs to the field of civil engineering materials, in particular to a calcium carbide slag-based micro-expansion agent and a preparation method thereof. Background technique [0002] There are many varieties of existing expansion agents, most of which use ettringite as the expansion source, belong to calcium sulfoaluminate type expansion agents, do not have continuous micro-expansion, and use high-grade mineral raw materials, complex production technology and high temperature. Due to the difficulty of calcination and other reasons, the production cost is generally high. [0003] The calcium carbide slag-based micro-expansion agent of the present invention has a relatively continuous expansion effect, is used for cement-based cementitious materials (including concrete), and can generate micro-expansion in the process of setting and hardening to compensate for shrinkage. SUMMARY OF THE INVENTION [0004] The purpose of the present inve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/28
CPCC04B40/0039C04B40/0046C04B22/064C04B22/06C04B22/145C04B24/10C04B24/285
Inventor 闫长旺孙存勇张菊刘曙光
Owner INNER MONGOLIA UNIV OF TECH
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