Cementing material, historic building repair mortar and preparation method of historic building repair mortar

A cementitious material and ancient building technology, applied in the field of ancient building repair mortar and its preparation, can solve the problems of irreplaceable repair mortar hydraulic lime and cement, iron tailings have no gelling performance, etc., to improve slump retention , good cohesion, and the effect of improving early strength

Active Publication Date: 2022-03-01
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical composition of iron tailings mainly contains SiO2, Al2O3, CaO, Fe2O3, MgO, etc. and a small amount of K2O, Na2O, S, P and other elements, ordinary iron tailings do not have any gelation Performance, can not replace the hydraulic lime and cement in the repair mortar

Method used

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  • Cementing material, historic building repair mortar and preparation method of historic building repair mortar
  • Cementing material, historic building repair mortar and preparation method of historic building repair mortar

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a cementitious material for ancient building repair mortar: components comprising the following parts by weight: 20 parts of slag and 500 parts of active iron tailings;

[0032] The preparation method of active iron tailings is: use a ball mill to grind the iron tailings to a specific surface area of ​​450㎡ / ㎏, add quicklime powder and water (the mass ratio of iron tailings, quicklime powder to water is 5:3.5:0.8) Mix and grind for 30 minutes, and activate the fully ground ultra-fine iron tailings and quicklime at a temperature of 700°C for 2 hours to obtain active iron tailings;

[0033] The slag is a slag powder with a specific surface area of ​​400㎡ / ㎏, an activity index of 110%, and a fluidity ratio of 96%.

Embodiment 2

[0035] This embodiment provides a cementitious material for ancient building repair mortar: components comprising the following parts by weight: 150 parts of slag and 250 parts of active iron tailings;

[0036] The preparation method of active iron tailings is: use a ball mill to grind the iron tailings to a specific surface area of ​​550㎡ / ㎏, add quicklime powder and water (the mass ratio of iron tailings, quicklime powder to water is 5:2.5:1.2) Mix and grind for 20 minutes, and activate the fully ground ultra-fine iron tailings and quicklime at a temperature of 800°C for 1 hour to obtain active iron tailings;

[0037] The slag is a slag powder with a specific surface area of ​​500㎡ / ㎏, an activity index of 100%, and a fluidity ratio of 98%.

Embodiment 3

[0039]This embodiment provides a cementitious material for ancient building repair mortar: components comprising the following parts by weight: 90 parts of slag and 370 parts of active iron tailings;

[0040] The preparation method of active iron tailings is: use a ball mill to grind the iron tailings to a specific surface area of ​​500㎡ / ㎏, add quicklime powder and water (the mass ratio of iron tailings, quicklime powder and water is 5:3:1) Mix and grind for 25 minutes, and activate the fully ground ultra-fine iron tailings and quicklime at a temperature of 750°C for 1.5 hours to obtain active iron tailings;

[0041] The slag is a slag powder with a specific surface area of ​​450㎡ / ㎏, an activity index of 105%, and a fluidity ratio of 97%.

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Abstract

The invention relates to the technical field of building materials, in particular to a cementing material, historic building repair mortar prepared from the cementing material and a preparation method of the historic building repair mortar, the historic building repair mortar is composed of the cementing material, aggregate, an additive and water, and the cementing material comprises the following components in parts by weight: 20-150 parts of slag and 250-500 parts of active iron tailings; a preparation method of the active iron tailings comprises the steps that iron tailings are dried and then subjected to first-time grinding, quicklime powder and water are added for second-time grinding, then high-temperature activation is conducted at the temperature of 700-800 DEG C, and the active iron tailings are obtained. According to the preparation method of the historic building repair mortar, provided by the invention, the active iron tailings and the slag are used for preparing the gel material for the historic building repair mortar, so that the bonding performance and the compressive strength of each age of the historic building repair mortar can be improved; the early strength is high, the cohesiveness is good, the erosion resistance is strong, and the durability is good.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a gel material, and an ancient building repair mortar made of the gel material and a preparation method thereof. Background technique [0002] Due to long-term exposure to the natural environment, ancient buildings will be damaged to varying degrees by long-term dry-wet cycle erosion, freeze-thaw erosion, acid rain and other harmful ion erosion. With the improvement of people's awareness of the protection of ancient cultural relics, the restoration of ancient buildings has attracted more and more attention. When building buildings in ancient times, it was mainly prepared from slaked lime, hydraulic lime and mineral admixtures. It has good water permeability, air permeability and compatibility, but lime repair mortar has low early strength, poor mechanical properties, and poor erosion resistance. , it is easy to form a porous structure in a dry environment, providing c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/153C04B7/38C04B28/08C04B111/54C04B111/72
CPCC04B7/24C04B7/153C04B7/38C04B28/08C04B2111/547C04B2111/72C04B14/06C04B2103/22C04B2103/302C04B2103/46Y02P40/10Y02W30/91
Inventor 刘娟红王荣林吴瑞东王欢韩方晖王金行纪芳
Owner UNIV OF SCI & TECH BEIJING
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