Nano modified Portland cement base facing mortar and preparation method thereof

A facing mortar and nano-modification technology, which is applied in the field of building materials, can solve the problems of uneven distribution of white matter and affect the decorative effect, and achieve simple and convenient preparation process and application method, good long-term performance and long operation time Effect

Inactive Publication Date: 2012-12-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is well known that Ca(OH) produced by Portland cement hydration 2 It is the main cause of efflorescence in facing mortar, Ca(OH) 2 It is easy to migrate to the surface of the mortar with pore water and interact with CO in the air 2 react to form white CaCO 3 Precipitation, besides Na + 、K + , SO 4 2- It will also migrate to the surface of the mortar to combine and precipitate to form a white precipitate. These white substances are unevenly distributed on the surface of the finishing mortar, which will affect its decorative effect

Method used

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  • Nano modified Portland cement base facing mortar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: A nano-modified Portland cement-based finishing mortar, its components and ratio (mass percentage) are: cement: 12%, slag powder: 6%, metakaolin: 2%, nano-SiO 2 : 0.2%, heavy calcium powder: 12%, 40-70 mesh quartz sand: 41.9%, 70-100 mesh quartz sand: 23%, latex powder: 2.2%, cellulose ether: 0.08%, water repellent: 0.2% , starch ether: 0.02%, iron oxide red: 0.4%.

[0034] Table 2 Example-1 Performance Index of Nano-modified Portland Cement-based Finishing Mortar

[0035] project Measured performance Operational time 150min Initial drying crack resistance no crack 30min water absorption / g 0.7 240min water absorption / g 1.2 Flexural strength / MPa 3.2 Compressive strength / MPa 7.5 Tensile bond strength / MPa 0.8 Anti-pantothenic No visible efflorescence, no powder shedding Stain resistance (white or light) 2

Embodiment 2

[0036] Example 2: A nano-modified Portland cement-based finishing mortar, its components and proportions (mass percentage) are: cement: 15%, slag powder: 4%, metakaolin: 1%, nano-SiO 2 : 0.4%, heavy calcium powder: 10%, 40-70 mesh quartz sand: 38%, 70-100 mesh quartz sand: 28.58%, latex powder: 2%, cellulose ether: 0.1%, water repellent: 0.2% , starch ether: 0.02%, wood fiber: 0.1%, iron oxide black: 0.6%.

[0037] Table 3 Example-2 Performance Index of Nano-modified Portland Cement-based Finishing Mortar

[0038] project Measured performance Operational time 180min Initial drying crack resistance no crack 30min water absorption / g 1.5 240min water absorption / g 2.4 Flexural strength / MPa 3.5 Compressive strength / MPa 7.5 Tensile bond strength / MPa 0.7 Anti-pantothenic No visible efflorescence, no powder shedding Stain resistance (white or light) 1

Embodiment 3

[0039] Example 3: A nano-modified Portland cement-based finishing mortar, its components and ratio (mass percentage) are: cement: 16%, slag powder: 3%, metakaolin: 1%, nano-SiO 2 : 0.4%, heavy calcium powder: 11%, 40-70 mesh quartz sand: 37%, 70-100 mesh quartz sand: 28.48%, latex powder: 1.8%, cellulose ether: 0.1%, water repellent: 0.2% , starch ether: 0.02%, wood fiber: 0.2%, iron oxide yellow: 0.8%.

[0040] Table 4 Example-3 Performance Index of Nano-modified Portland Cement-based Finishing Mortar

[0041] project Measured performance Operational time 160min Initial drying crack resistance no crack 30min water absorption / g 0.9 240min water absorption / g 1.5 Flexural strength / MPa 3 Compressive strength / MPa 7 Tensile bond strength / MPa 0.9 Anti-pantothenic No visible efflorescence, no powder shedding Stain resistance (white or light) 2

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Abstract

The invention belongs to the field of building materials and particularly relates to nano modified Portland cement base facing mortar and a preparation method thereof. The nano modified Portland cement base facing mortar comprises the following components in percent by weight: 12-17 percent of cement, 3-8 percent of mineral mixture, 0.2-0.6 percent of nano materials, 8-12 percent of ground calcium carbonate, 60-70 percent of quartz sand, 1.5-2.2 percent of latex powder, 0.6-1 percent of cellulose ether, 0.4-1 percent of pigment and 0.2-0.4 percent of other additives. The nano modified Portland cement base facing mortar solves the problem that the Portland cement base facing mortar is apt to be efflorescent and be stained, has the advantages of good construction performance, high construction efficiency, good compatibility and match with various base materials, uniform color, higher strength, good weather resistance, good air permeability, good waterproof performance, low cost and the like, and can be particularly used as a facing decoration material for external heat insulation systems of exterior walls of buildings.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a nano-modified Portland cement-based decorative mortar which is free from pan-alkaline during use and has good stain resistance and weather resistance and a preparation method thereof. Background technique [0002] Finishing mortar is a new type of wall decoration material. Compared with organic paint finishing materials, it has good durability and can reduce the cost of wall decoration maintenance and renovation; compared with tile facing materials, facing mortar The thickness is only 1-5mm, and the weight is light, which can significantly reduce the load of the external wall insulation system, especially when it is used as a high-rise building decoration, it can avoid the phenomenon of tiles falling due to negative wind pressure. In developed countries, facing mortar has been widely used in the wall decoration of buildings instead of paint and ceramic tiles. But...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/06
Inventor 王培铭朱绘美张国防薛伶俐
Owner TONGJI UNIV
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