cement mortar

building material

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Cement mortar is composed of cement 、 Fine aggregate And water, namely cement+sand+water, mortar prepared as required, cement mixed mortar It is made of cement, fine aggregate, lime and water. They are different concepts, different names, and different uses.

Generally speaking, 1:3 cement mortar is mixed with 1 weight of cement and 3 weight of sand. In fact, the composition of water is ignored. The proportion is about 0.65, which is called 1:3: 0.65. The density of cement mortar is 2000Kg/m three 。

Note: Architecture Construction process For the convenience of construction, the mortar used in mix proportion 1: 3 refers to the volume ratio, which is then converted into the weight ratio according to the capacity of the on-site mixer or material container; Mortar used in structural construction is mostly finished mortar, which is expressed by mortar strength, such as M5, M7.5, M10 mortar, etc.

Chinese name: cement mortar
Discipline classification: Materials science; building material

application area: architectural engineering; Water conservancy bridge;
Main components: Cement; Sand; water
Density: 2000Kg/m3.

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Mortar type

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The strength grade of cement mortar and premixed masonry mortar can be divided into M5 M7.5、M10、M15、M20、M25、M30

Cement mixed mortar The strength grade can be divided into M5, M7.5, M10 and M15.

Production purpose

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In construction engineering, the first is foundation and wall masonry, which is used as block masonry materials adhesive , such as masonry Rubble 、 red brick Cement mortar shall be used; Second, it is used for indoor and outdoor plastering.

construction technology

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1. Basic process of cement mortar plastering. Leveling → square the four corners of the wall → level the horizontal line and hang the vertical line straight → fabrication standard Grey cake 、 Screed → Internal and external corners Find the square → Interior wall Plastering → bottom layer is lower than screed → middle layer is padded with screed → Surface course renovation

2. Key points of cement mortar plastering construction Standard mortar cake must be made before plastering.

3. The screeding is also an important link to ensure the plastering quality, and is an important control sign for large-scale plastering.

four Internal and external corners It is also an important process directly related to the quality of subsequent decoration projects.

Strictly speaking, it is different from the sand particle size Water content The actual strength of cement is closely related to the construction level. Assume: cement grade 32.5 (actual strength 37.5), using Medium sand , the water content of sand is 1.5%, construction level: general, the preparation strength is 8.71MPa mix proportion Yes (weight ratio): cement: sand=1:5.51; material consumption: cement: 267Kg; medium sand: 1472kg; as for water, it is about 40kg, which should be adjusted according to the actual situation on site.

Mortar matching

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Mortar mix proportion
technical requirement	cement mortar			mixed mortar
technical requirement	Consistency/mm: 70 ～ 90			Consistency/mm: 70 ～ 90
raw material	Cement: Grade 32.5			River sand: medium sand			-
kg/m3	cement	River sand	water	cement	River sand	Plaster	water
M 2.5	two hundred	one thousand four hundred and fifty	310~330	one hundred and fifty	one thousand four hundred and fifty	two hundred	270~290
M 2.5	one	seven point two five	Reference water consumption	one	nine point six seven	one point three three	Reference water consumption
M 5.0	two hundred and ten	one thousand four hundred and fifty	310~330	one hundred and ninety	one thousand four hundred and fifty	one hundred and sixty	270~290
M 5.0	one	six point nine	Reference water consumption	one	seven point six three	zero point eight four	Reference water consumption
M 7.5	two hundred and thirty	one thousand four hundred and fifty	310~330	two hundred and fifty	one thousand four hundred and fifty	one hundred	270~290
M 7.5	one	six point three	Reference water consumption	one	five point eight	zero point four	Reference water consumption
M 10	two hundred and seventy-five	one thousand four hundred and fifty	310~330	two hundred and ninety	one thousand four hundred and fifty	sixty	270~290
M 10	one	five point two seven	Reference water consumption	one	five	zero point two one	Reference water consumption
M 15	three hundred and twenty	one thousand four hundred and fifty	310~330	/
M 15	one	four point five three	Reference water consumption
M 20	three hundred and sixty	one thousand four hundred and fifty	310~330
M 20	one	four point zero three	Reference water consumption
Note: mix proportion is only for reference

matters needing attention

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When cement mortar is used, some additives such as micro foam agent Waterproof powder To improve its workability and Viscosity 。

Concrete is made by adding stones into cement mortar in proportion.

cement mortar grade Strength means to press standard method 7.07 for fabrication and curing CMX 7.07CMX7.07CM positive Cube Test piece, at 28d Age , measured by standard test method compressive strength Overall distribution A value in.

No. 100 cement mortar refers to its strength of 100Kg/cm2, which has been changed to MPa. No. 100 corresponds to M10. The mix proportion varies according to different raw materials and mortar uses Ordinary Portland Cement , medium sand 100 (M10) Masonry mortar For example, the mortar ratio per cubic meter is 305kg cement: 1.10m3 sand: 183kg water.

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