Saltpetering-preventing cement mortar and maintenance method

A technology of cement mortar and efflorescence, which is applied in the field of cement mortar, can solve the problems of easy failure of mortar bonding strength, waterproof layer, high maintenance cost, and unsatisfactory effect, so as to reduce the phenomenon of efflorescence, increase the sealing capacity, and facilitate popularization and application value effect

Inactive Publication Date: 2020-05-15
HANGZHOU LANDSCAPING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional efflorescence treatment methods are mainly divided into three categories: (1) water-proof treatment, coating a layer of water-proof agent on the hard pavement surface or the bottom surface of cement mortar, but because it will affect the bond strength of the mortar and the hard pavement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example

[0017] Implementation case: an anti-pan-alkali cement mortar and its maintenance method:

[0018] Carry out hard paving on the concrete surface after the previous construction is completed. (1) Water and moisten before paving, and there must be no air-drying phenomenon. Brush the back of the stone slab clean and keep it moist. (2) Spread cement mortar leveling layer, the components and parts by weight of cement mortar are: 200-250 parts of cement, 400-750 parts of sand, 50-80 parts of superfine silica fume, 10-15 parts of attapulgite powder, 3-10 parts of bentonite, 1-2 parts of cellulose. The cement is ordinary Portland 42.5 cement; the sand is natural medium-coarse river sand; the ultra-fine silica fume is in the form of an amorphous spherical shape with a specific surface area > 20m2 / g and an activity index > 90 % off-white powder; the attapulgite powder is obtained by calcining raw ore attapulgite clay at 400°C to 850°C for 1h to 4h; the pH of the bentonite is 20.0MPa, c...

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PUM

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Abstract

The invention provides a saltpetering-preventing cement mortar and a maintenance method. The cement mortar comprises the following components: ordinary Portland cement, sand, ultrafine silicon powder,attapulgite powder, bentonite and cellulose ether. The surface of a paving material is immediately covered with a plastic film after the hard paving construction is finished. The saltpetering-preventing cement mortar has the advantages that the cement design strength and the economy can be ensured, the saltpetering is inhibited in the later period of cement mortar; and the film covering method after construction can accelerate the development of the internal structure of the cement mortar and accelerate the improvement of the closing amount of internal ducts of the cement mortar, so that thesaltpetering phenomenon is fundamentally reduced.

Description

technical field [0001] The invention relates to a cement mortar, in particular to an anti-pan-alkali cement mortar and a curing method. Background technique [0002] The hard pavement installed by the wet paste method is prone to pan-alkaline phenomenon on the surface and gaps of the hard pavement due to repeated encounters with rain or wet weather during use, which will not fade over the years and seriously affect the quality of the construction project. , also has a great influence on the bond strength between the layers inside the hard pavement. There are three main reasons for efflorescence: (1) materials such as cement, sand and admixtures contain soluble salt and alkali; (2) there are many pores in cement products with a certain moisture content; (3) soluble salt and Alkali, along with water, migrates to the surface through the pores, and precipitates on the surface or reacts with CO2 in the air to form white deposits. The traditional efflorescence treatment methods ...

Claims

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Application Information

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IPC IPC(8): C04B28/04E01C7/14E01C23/03
CPCC04B28/04C04B2201/50E01C7/142E01C23/03C04B14/06C04B18/146C04B14/102C04B14/104C04B24/383
Inventor 胡鹏
Owner HANGZHOU LANDSCAPING
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