What Is Bricks and Mortar?

Ready-mixed mortar refers to a variety of mortar mixes produced by professional manufacturers for use in construction projects. It is a new type of building material developed in recent years in China.

Ready-mixed mortar

Ordinary mortar mainly includes masonry mortar, plastering mortar, and ground mortar. Masonry mortar and plaster

When ready-mixed mortar enters the site, the supplier shall provide the buyer with quality certification documents in accordance with the specified batch. The quality certification documents shall include product form inspection reports and factory inspection reports.

Ready-mixed mortar shall be visually inspected upon entering the site and shall meet the following requirements:

The wet mix mortar should be uniform in appearance without segregation or bleeding;

The dry-mixed mortar in bulk should be uniform in appearance, free from agglomeration and moisture;

The dry-mixed mortar in bags should be completely packaged without moisture.

According to GB / T25181-2010 "Premixed Mortar", the consistency of wet mix mortar should be tested, and the allowable deviation of consistency should conform to the following table:

Deviation of consistency of wet mortar

Specified consistency / mm	Allowable deviation / mm
50, 70, 90	± 10
110	+5
	-10

After the appearance and consistency inspection of the ready-mixed mortar is qualified, it should be retested according to the following table:

Ready-mixed mortar entry inspection items and inspection batches

Mortar Variety		Test items	Inspection lot
Wet masonry mortar		Water retention rate, compressive strength	Same manufacturer, same variety, same grade, same batch number In addition, every 250m3 of wet mortar mixed in continuously is an inspection lot. When it is less than 250m3, it should be calculated as one inspection lot
Wet mix mortar		Water retention, compressive strength, tensile bond strength
Wet mix floor mortar		Water retention rate, compressive strength
Wet mix waterproof mortar		Water retention, compressive strength, impervious pressure, tensile bond strength
Dry mix Mortar	Ordinary masonry mortar	Water retention rate, compressive strength	Same manufacturer, same variety, same grade, same batch number In addition, every 500t of dry-mixed mortar for continuous approach is an inspection batch If it is less than 500t, it shall be counted as one inspection lot.
	Thin layer masonry mortar	Water retention rate, compressive strength
Dry mix Mortar	Ordinary plastering mortar	Water retention, compressive strength, tensile bond strength
	Thin-layer plaster	Water retention, compressive strength, tensile bond strength
Dry mix floor mortar		Water retention rate, compressive strength
Dry-mixed ordinary waterproof mortar		Water retention, compressive strength, impervious pressure, tensile bond strength
Polymer cement waterproof mortar		Setting time, alkali resistance, heat resistance	The same manufacturer, the same species, the same grade, the same batch number and continuous access to the mortar, every 50t is an inspection batch, If it is less than 50t, it shall be calculated as one inspection lot.
Interface mortar		14d normal temperature tensile bond strength	The same manufacturer, the same variety, the same grade, the same batch number and continuous access to the mortar, every 30t is an inspection batch, If it is less than 30t, it should be counted as one inspection lot.
Ceramic tile concrete mortar		Tensile bond strength at room temperature and normal state, time to dry	The same manufacturer, the same species, the same grade, the same batch number and continuous access to the mortar, every 50t is an inspection batch, If it is less than 50t, it shall be calculated as one inspection lot.

1. Wet mix mortar storage

The construction site should be equipped with a wet mortar storage container, which should meet the following requirements:

The storage container should be closed and not absorb water;

The number and capacity of storage containers should meet the type of mortar. Requirements for supply;

When the storage container is used, there should be no sundries or clear water inside;

The storage container should be convenient for storage and transportation, cleaning and mortar access;

When the mortar is stored, rainproof measures should be taken;

Storage containers should be protected from shading and heat. ^[1]

1. The selection of ready-mixed mortar should be determined according to the requirements of design and construction.

2. Ready-mixed mortars of different varieties and specifications should not be mixed for use.

3. Before construction of the ready-mixed mortar, the construction unit shall prepare a construction plan according to the design and engineering requirements and the specifications of the ready-mixed mortar product, and shall carry out the construction according to the construction plan.

4. During the construction of ready-mixed mortar, the construction environment temperature should be 5 35 . When the temperature is lower than 5 or higher than 35 , measures should be taken to ensure the quality of the project. In the open-air environment with a magnitude of five or more wind, rain and snow, pre-mixed mortar construction should not be performed.

5. The construction unit shall establish a self-inspection, mutual inspection and full-time personnel inspection system for each process, and shall have a complete construction inspection record.

6. The compressive strength and solid tensile bond strength of ready-mixed mortar shall be evaluated according to the acceptance batch. ^[1]

Dry-mixed mortar should be mixed with water or other supporting components according to the requirements of the product manual, and no other ingredients should be added.

Dry-mixed mortar mixing water should comply with the current industry standard JGJ63-2006 "Concrete Water Standard" for water mixing of concrete.

The dry-mixed mortar should be mechanically stirred, and the stirring time should meet the requirements of the product manual, but also meet the following requirements:

When using a continuous mixer, stir evenly and make the mortar mix uniform and stable;

When using a hand-held electric stirrer, add a specified amount of water or liquid to the container, and then add a mortar to stir. The stirring time should be 3 ~ 5min, and it should be stirred uniformly. After the product is stopped according to the requirements of the product manual, mix well;

After mixing, clean the mixing equipment in time.

The mortar mix should be used up within the mortar's operable time and should meet the project construction requirements.

When a small amount of bleeding occurs in the mortar mixture, it should be mixed evenly before use. ^[1]

It is the first comprehensive industry standard on ready-mixed mortar, which has detailed regulations on two types of 18 types of mortars, wet and dry mix. Through a large number of experimental studies and extensive investigations and opinions, this compilation work put forward the performance indicators of wet and dry-mixed mortars, and determined the water retention and tensile bond strength tests of the mortars with reference to domestic and foreign standards and specifications. method. The requirements for compressive strength, water retention and tensile cohesive strength of plastering mortar are put forward; the requirements of compressive strength, water retention and masonry strength of masonry mortar are put forward to meet the requirements of relevant national standards and specifications.

As this standard is formulated for the first time, in view of the limited preparation time and personnel, the work of this compilation focuses on ordinary mortars. The special mortars are only quoted from the original standards, and their performance indicators have not been adjusted.

The implementation of this standard is conducive to standardizing the healthy and stable development of ready-mixed mortar, an emerging industry, and to promote the development of ready-mixed mortar in our country. Production and application.