Grouting construction

Basic processing

1. Clean the surface of the foundation without any debris such as crushed stones, floating slurry, floating ash, oil stains, and release agents.

2. 24 hours before grouting, the foundation surface should be fully wetted, and 1 hour before grouting, any accumulated water should be removed.
Wholesale price of prestressed duct grouting material Baoding Laishui polymer repair mortar

The design mechanism of the external insulation system and the causes of surface layer cracks. The design principles of the external insulation system. Energy saving building external insulation is a system composed of multiple materials, and its technical requirements are: the normal deformation of the base layer should not cause cracks or hollowing in the system; the system should be able to withstand its own weight for a long time without harmful deformation; The system should be able to withstand the effects of positive and negative wind pressure and wind vibration; The system is able to resist stress caused by temperature and humidity changes and maintain its stability; The system will not detach from the grassroots level during earthquake prevention; The fire resistance performance of the system should comply with relevant regulatory requirements; The physical and chemical properties of each component of the system are good, ensuring that the system has good durability.

: Support mold

1. Set up templates according to the grouting construction drawing. The joints between templates and foundations, as well as between templates, shall be sealed with cement slurry, tape, etc. to achieve the degree of overall template waterproofing.

2. The horizontal distance between the template and the equipment base should be controlled at around 100mm to facilitate grouting construction.

3. The top elevation of the template should be 50mm higher than the surface of the equipment base.

4. If there is grout leakage during grouting, it should be dealt with in a timely manner.

 
Recently, no granite varieties above Class C have been found in China. Most of them are Class A, and some varieties sometimes lean slightly towards Class B. Stone is an integral part of the material world and a source of raw materials for various building materials, building our living space together with other building materials. It is normal and natural for humans to be constantly exposed to external radiation in a radioactive environment for hundreds of thousands of years. The radioactive level of building materials belongs to low-dose radiation, which cannot quickly lead to deterministic effects in the short term. Some reports and rumors lack theoretical and practical basis. We should approach the radioactive issue of granite from a scientific perspective, and then choose stone materials appropriately and reasonably to achieve both beautifying homes and ensuring personal health and safety.

Step 3: Preparation of grouting material

1. The general reinforced type is mixed with water at a standard of 12-13%, while the pea gravel reinforced type is mixed with water at a standard of 9-10%.

2. It is recommended to use mechanical stirring method, and the stirring time is generally 1-2 minutes. When using manual mixing, 2/3 of the water should be added first and mixed for 2 minutes, then the remaining water should be added and mixed evenly

Although the safety performance is controlled within environmental requirements, this waterproof coating has a strong odor that is difficult for most people to accept, and a few brands do not meet environmental performance standards. It is gelatinous and thick, requiring the use of a scraper during construction, which is laborious and complex. After painting, surface treatment is required, such as roughening or sanding, to increase friction and facilitate tiling. The drying speed of these coatings is affected by climate, and the drying speed is relatively slow under humid and cold climate conditions, but climate has no effect on the waterproof effect. In general, the drying cycle for mortar is 24 hours, and the drying cycle for esters is 24-48 hours.

3. The amount of mixing each time should be determined based on the amount used to ensure that the material is used up within 30 minutes.

4. During on-site use, it is strictly prohibited to add any admixtures or external additives to the grouting material.

Step 4: Grouting Construction Method

1. Long equipment or track foundations should be constructed in sections.

2. During secondary grouting, grouting should be carried out from multiple points on one side or adjacent sides until it overflows from the other side, in order to facilitate exhaust during the grouting process. Grouting shall not be carried out simultaneously from all four sides

Stone is composed of natural minerals and has a complex composition. Its processability varies greatly depending on the type of stone. The composition of stone also has a significant impact on processing efficiency. Some scholars have attempted to identify the factors that affect stone processing efficiency through research on the mineral composition, chemical composition, hardness, and mineral crystal structure of the stone itself. Shao Guoguo et al. pointed out through petrological identification and grinding polishing experiments of granite that the difficulty of polishing granite is closely related to its mineral composition. Xie Jin and others from the University of Geosciences used a microhardness tester to test the microhardness of rock minerals in one type of granite, studied the distribution pattern of microhardness on the surface of granite, and analyzed the machinability of granite using weighted microhardness values.

3. After grouting begins, it must be carried out continuously without interruption. And shorten the grouting time as much as possible.

4. Vibration is strictly prohibited during the grouting process. If necessary, a grouting booster can be used to push the grouting material along the bottom of the grouting layer. It is strictly prohibited to push it from the middle or upper part of the grouting layer to ensure its uniformity.

5. After the equipment foundation grouting is completed, a 45 degree oblique angle should be cut outward along the edge of the equipment 3-6 hours after grouting to prevent cracks from forming at the free end. If edge cutting is not possible, the surface of the grouting layer should be smoothed with a trowel 3-6 hours after grouting.

6. The thickness of each grouting material should not exceed 100mm.

According to their protective purposes, waterproofing agents can be classified into two categories: waterproof and anti fouling. Waterproofing agents are liquid materials that can provide waterproof protection to stone and prevent damage from water. Anti fouling agent is a liquid material that can prevent stone from being damaged and contaminated by water and other liquid pollutants (such as juice, cooking oil, engine oil, dyes, etc.). According to their active substances, they can be classified into silicate protectants, organosilicon oligomer protectants, class protectants, organofluorosilicon protectants, and organofluorocarbon protectants. I. The silicon salt protective agents on the market are mainly aqueous solutions containing inorganic silicon salts as active ingredients, which are one of the earliest applied organic silicon protective agents.

7. When the grouting volume of the equipment foundation is large, the mixing of pea gravel reinforced grouting material should be done by mechanical mixing to ensure grouting construction.

Step 5: Maintenance

1. Within 30 minutes after grouting is completed, a wet grass curtain or rock wool blanket should be immediately covered and kept moist.

2. During winter construction, maintenance measures should also comply with the relevant provisions of the current GB50204 standard.

3. After the grouting material reaches the demoulding time, equipment installation can be carried out. For specific time, please refer to the "Relationship Table between Demoulding and Curing Time and Environmental Temperature".

4. After the grouting of the equipment foundation is completed, if any parts need to be removed, they can be gently removed with a spatula or shovel tool 3-6 hours after the grouting is completed, before the grouting layer hardens.

5. The vibration of the running machine should not be transmitted to the equipment foundation. After the secondary grouting, the machine should be stopped for 24-36 hours to avoid damaging the uncured grouting layer.

Foamed cement brick is made by mixing foam small particles and cement, which has the high quality performance of light weight, heat preservation, sound insulation and fire prevention, and greatly reduces the cost due to the use of small diameter. It is an ideal product for non load bearing walls. Autoclaved foam concrete brick is mainly made of cement, slag powder and river sand as raw materials. After mixing, it is foamed by pressurized air, forced to mix air into the mixed slurry to form. The concrete with micro bubble structure is cast and molded by autoclave reaction and other processes. It is a new wall material with environmental protection, energy conservation and stable material quality. The buildings using autoclaved foam concrete bricks as wall materials have been tested to be of good quality after two years of construction and use, and meet the national requirements for project quality, sound insulation, energy conservation, fire prevention and other standards.

Recommended dosage

Calculate the actual usage based on a reference dosage of 2.28-2.4 tons/cubic meter.

Packaging, storage and transportation

1. Packaging specifications: 50kg ± 1kg per bag, stored in a ventilated and dry place and protected from direct sunlight.

2. The shelf life is 3 months. If it exceeds the shelf life, it should be retested and qualified before use.

3. Does not contain components such as benzene derivatives, halogenated hydrocarbons, heavy metals, etc., non-toxic, odorless, pollution-free, non flammable and non explosive, and can be transported as general cargo