Construction standard of cement sand perlite insulation mortar
Author：ANT CONSTRUCTIONS Comefrom： Createdate：2020/11/1 9:16:21 Hits：27
Construction standard of cement sand based perlite insulation mortar
Definition of cement sand based perlite insulation mortar
Vitrified microsphere perlite thermal insulation mortar is a cement-based mortar with thermal insulation and energy saving effect made by adding light perlite thermal insulation materials and additives on the basis of traditional construction mortar. It is a special functional mortar with thermal insulation properties which developed after the implementation of the building energy saving policy in China. The vitrified perlite bead thermal insulation mortar is a series of production processes such as ingredients, mixing, and transportation from the traditional construction site operations, a commercial vitrified perlite bead thermal insulation mortar is produced by a professional and socialized independent building material manufacturer. The production of vitrified micro-bead prelite insulation mortar also requires special production equipment. ANT CONSTRUCTION has specially designed non-damage vitrified micro-bead prelite insulation mortar mixer equipment specially suitable for mixing vitrified micro-bead perlite insulation mortar which has been rapidly implemented throughout the country.
The key issues in the implementation of vitrified microsphere perlite thermal insulation mortar
The physical and mechanical performance index requirements of commercial vitrified microbead insulation perlite mortar
The physical and mechanical properties of vitrified microbead thermal insulation perlite mortar include the operability of the construction process and its strength as a mortar. The following is aimed at introducing the compressive strength, consistency, water retention rate and other indicators to provide a theoretical reference for the engineering design and construction of the vitrified bead thermal insulation perlite mortar.
According to the current building plastering engineering, masonry engineering, ground engineering technical specifications, regulations and the actual application of vitrified microsphere thermal insulation perlite mortar, here we concluded performance index of compressive strength of bead insulation perlite mortar under different application requirements.
The compressive strength of the vitrified bead thermal insulation plaster perlite mortar should not meet the requirements of less than 300Kpa, and the operation should be carried out in accordance with the construction process specified in the DB J04-250-2004 "Technical Regulations for the Application of Vitrified Bead Thermal Insulation Perlite Mortar".
Commercial vitrified microbead thermal insulation masonry perlite mortar is generally used in weight-bearing or non-weight-bearing energy-saving light-weight block masonry projects to eliminate the "thermal bridge" phenomenon in the entire masonry and ensure the overall safety of the masonry structure. Therefore, the commercial vitrified bead thermal insulation masonry prelite mortar should match the strength of the lightweight block. For general thermal insulation and energy-saving blocks, such as lightweight aggregate microporous concrete composite blocks, aerated concrete blocks and other lightweight blocks, most of them are self-supporting filling type, and the light level is generally 2.5～5.0Mpa. The strength grade of the microbead thermal insulation masonry mortar should be greater than M2.5, and M5 being the main strength grades.
Commercial vitrified microsphere thermal insulation ground perlite mortar is directly used on the ground surface of a building. Under the requirements of thermal insulation, its compressive strength should meet the compressive strength requirements of ordinary ground mortar, so commercial vitrified microsphere thermal insulation ground mortar compressive strength should not be lower than M15.
The choice of the consistency of the commercial vitrified microbead thermal insulation plaster perlite mortar can be selected according to the surface layer of the mortar and the construction operation method. Refer to Table 1.
Table 1, Selection of the consistency of commercial vitrified microbead thermal insulation plaster perlite mortar.
Unit: mm
| Project item | Mechanical construction | Manual construction |
| Preparation layer | 90-100 | 100-110
|
| Base layer | 80-90
| 70-80
|
Surface layer
| 70-80
| 90-100
|
The consistency of commercial vitrified microbead thermal insulation masonry perlite mortar
It can be selected according to the different masonry materials used and climatic conditions, please refer to Table 2.
| Project item | Dry climate or porous masonry | Cold climate or dense solid |
| Brick masonry solid | 80-100 | 60-80 |
| Concrete masonry solid | 70-90
| 50-70
|
Stone masonry solid
| 30-50
| 20-30 |
Considering that the mortar mixture used for the ground surface layer is too dry which not easy to operate; the mixture is too wet which easy to be hollow after hardening, the consistency of the commercial vitrified bead insulation ground perlite mortar should generally be controlled within 30-50mm .
At present, the relevant standards and regulations of vitrified microbead thermal insulation perlite mortar have not stipulated the water retention index for commercial vitrified microbead thermal insulation prerlite mortar. The water retention rate of ready-mixed vitrified microbeads perlite should not be less than 88% in reference to the country and industry features.
The setting time reflects the longest time for the ready-mixed vitrified microbead thermal insulation prelite mortar to lose its operability in construction. The determination of the setting time of the ready-mixed vitrified microsphere thermal insulation mortar should consider the distance between the production site and the construction site, the performance of the transportation equipment, the climatic conditions of the construction and the conditions of the construction site, including factors such as the construction location and the construction level.
Considering the above influences, an appropriate amount of coagulant can be added to the ready-mixed vitrified micro-bead insulation mortar to adjust the setting time of the mortar to meet the needs of actual engineering construction, so the setting time of the ready-mixed vitrified micro-bead insulation mortar indicators should not be clearly specified.
The transportation duration of commercial vitrified microsphere thermal insulation mortar is related to the temperature conditions during construction. Too long transportation time will cause a large deviation between the performance of the mixture when the mortar is delivered and the time when it leaves the factory, which will affect the application, and will also shorten the effective application of the mortar. Therefore, the transportation duration of the wet-mixed vitrified microbead insulation mortar should not exceed 150min at 5～35℃, and it should not exceed 120min at other temperatures.
Construction and curing conditions
When cement-based ready-mixed vitrified micro-bead thermal insulation perlite mortar is used in plastering, masonry and ground engineering, it needs to be cured to achieve the required strength. In the curing process of commercial vitrified microsphere thermal insulation mortar, cement hydration requires certain temperature and humidity conditions, and the polymer admixture added in the commercial vitrified microsphere thermal insulation mortar is formed through the process of dehydration and condensation. Therefore, the curing of commercial vitrified bead thermal insulation mortar not only meet the full hydration of cement, but also ensure that the polymer can be dried and agglomerated to form a film, so as to meet the pressure and crack resistance, durability and other requirements.of the commercial vitrified bead thermal insulation mortar.
2. The commercialization of vitrified microbead insulation mortar requires advanced production technology
The current vitrified microbead thermal insulation mortar products are packaged in dry-mixed bags. Due to the mixing of water at the construction site, it is impossible to fully meet the different requirements for materials in the design of buildings. The production of commercial vitrified microsphere thermal insulation mortar is basically the same as the production of commercial concrete. According to different mix ratios, finished mortars meeting different requirements can be produced. This is the real commercial vitrified microsphere thermal insulation mortar product.
Most manufacturers of vitrified bead thermal insulation mortar equipment have not yet realized fully automatic computer control, and the degree of specialization in the production management process is not enough. The production management of ready-mixed vitrified bead thermal insulation mortar enterprises must be strengthened, with the help of computer information management methods, Through the production enterprise database data system, data can be extracted from a large number of thermal insulation and energy-saving effects that meet different requirements. According to the actual situation of the project design and construction, the trial configuration can be quickly carried out to obtain a reasonable matching list; in addition, specialization the production enterprises in China have advanced production equipment, relatively advanced production technology, and a high degree of specialization in the production management process. Only in this way the product quality of vitrified microbead insulation mortar can be guaranteed.
In short, the technical performance indicators of vitrified microsphere thermal insulation mortar have practical guiding significance for standardizing the production and application of commercial vitrified microsphere thermal insulation mortar. The implementation of vitrified microsphere thermal insulation mortar equipment in our country also requires national support, if possible the realization of automatic computer control and production management process specialization as soon as possible, coupled with the support of relevant government departments, can accelerate the commercialization of vitrified microbead insulation mortar.
