Chemical cleaning construction must pay attention to issues!


The correct selection of cleaning agents is a crucial step in completing chemical cleaning. In the past, many cleaning agents used on construction sites were single chemicals, such as oxalic acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, etc. Although these chemicals have a certain cleaning effect on certain stains, they are likely to cause more serious stone diseases. For example, strong acid cleaning is one of the main reasons for future water and rust spots.

The correct selection of cleaning agents is a crucial step in completing chemical cleaning. In the past, many cleaning agents used on construction sites were single chemicals, such as oxalic acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, etc. Although these chemicals have a certain cleaning effect on certain stains, they are likely to cause more serious stone diseases. For example, strong acid cleaning is one of the main reasons for future water and rust spots.

At present, many manufacturers and research institutions have stone cleaning agent products with a wide variety, chaotic names, and a mix of fish and dragon.

As a user, the principles for selecting stone cleaning agents are:

According to the material of the stone

Firstly, the type of stone to be cleaned should be determined. For example, whether it is granite or marble, the detergent used for granite cannot be used for marble, and vice versa. The main reason is that marble is not acid resistant, and if the pH value of the solution is less than 5, it may corrode the marble.

According to the type of stone lesions

Although there are many stone lesions, they can be generally divided into some major categories, and the recognition methods are regular and can be followed. The identification of stone lesions can be determined through training and learning, reading books, expert analysis, peer introductions, and personal practice. This will not be repeated here.

Sampling and analysis based on pollutants

For some complex stone lesions with large engineering quantities and difficulty in accurately distinguishing, a small amount of samples (including contaminated and uncontaminated samples) can be taken and sent to scientific research institutions or professional testing institutions for analysis to determine the types of pollutants, and chemical cleaning methods can be designed and tested.

Based on the comparison of small experiments

For nursing companies and technicians with conditions, a certain amount and different types of stone cleaning agents can be stored year-round. When encountering difficult stone lesions, a series of small experiments can be conducted to compare and select cleaning agents based on actual effects. It is recommended that major nursing companies reserve some stone cleaning agents appropriately.

Start with a small experiment


Stone lesions vary greatly, such as the hygroscopic substances and easily deliquescent salts in water stains. One cleaning agent is often only suitable for certain types of lesions, and improper use can easily lead to other lesions. Therefore, without understanding the causes of stains, small experiments must be conducted first.

The benefits of conducting small experiments first

1. It can avoid serious losses caused by improper or incorrect use of a large amount of chemical solution.

2. It is possible to determine the type and usage method of the required cleaning agent with ease and effort.

3. It can convince the owner and construction personnel of the expected effect of cleaning construction.

4. It can serve as the acceptance standard for the construction contract signed by both parties, and using small experimental samples as the acceptance standard for the disease treatment project can avoid disputes caused by unclear words or words, which is beneficial to the construction party.

Before and after the small experiment, photos should be taken of the experimental area for future evaluation and acceptance.

The following points should be noted in on-site small experiments

1. Selection of small experimental areas:

The selected area should be representative, including the type of stone, disease treatment, pollution level and status, etc. In addition, the test location should avoid viewpoint sensitive areas, facilitate experimental operations, and retain the site.

2. Appropriate test area:

The general experimental area is about (30-60) cm * (30-60) cm per block, and can be expanded or reduced in special circumstances.

3. Process records:

It is best to have photos and written records of the entire process of the test, especially before and after pollutant cleaning, as well as the overall effect of the cleaning work before and after completion. Records of the time before and after cleaning, and the surface condition of the stone should be kept for future evaluation and acceptance.

4. Detection and evaluation of cleaning effect:

After the small experiment is completed, it is necessary to evaluate the effect in a timely manner and arrange subsequent observations, paying attention to the potential harm that the cleaning work may cause to the stone and surrounding areas.

5. Record of environmental and climatic conditions:

To ensure the repeatability of the experiment and facilitate future applications, the climatic conditions during on-site small-scale experiments should be recorded, including environmental temperature and humidity data.

Protect areas that do not require cleaning and the surrounding environment


The chemicals used for chemical cleaning of stone materials have some side effects on the stone and surrounding environment, and protection should be taken in advance before construction.


1. Stones adjacent to diseased stones that do not require cleaning

2. Surrounding buildings and decorations that may be contaminated or infiltrated by liquid medicine

3. Medicinal liquid may touch or splash flowers, plants, and trees

4. The potion may flow or drip into the surrounding ditches and soil.

The simplest protective measure is to use self-adhesive and plastic film to cover it. When there is a large amount of chemical solution, it is necessary to add containers such as plastic buckets to allow the solution on the plastic film to flow into the plastic bucket for unified treatment.

Ensure the safety protection of construction personnel and construction sites


1. Provide personal protection for construction personnel

Wear work clothes, gloves, masks, goggles, etc. required for construction.

2. Make good notices and barricades for the public

For example, setting up safety warning signs, setting up warning lines, and assigning dedicated personnel to guard.

3. Provide safety protection for the construction site

Such as ventilation, fire and explosion prevention at the construction site.

Take good care of the aftermath of chemical cleaning construction


At present, many chemical cleaning constructions do not pay much attention to post treatment, and common problems include:

1. Failure to timely remove residual chemicals

This can lead to drug-induced water stains or slow corrosion of the stone in the future.

2. The pathogenic substance (element) of the residue has not been completely removed

The residual divalent iron ions after cleaning rust spots, and the residual hygroscopic saline alkali after washing water spots can easily cause stone lesions.

3. Chemical cleaning construction requires a large amount of water

This can cause drugs and water to seep into the joints of the stone, causing water spots and other pathological changes.

After chemical cleaning construction, the work of removing residues is quite important. In general, clean water is used to remove residues, and it is recommended to use as little water as possible. It is best to apply the residue with clean water in a "small amount of water, multiple times" manner until the residue is completely adsorbed and removed, to prevent the residue from causing secondary damage to the stone.

Safe storage and waste disposal of cleaning agents


Cleaning agents belong to chemical products and have a certain degree of toxicity and harm. Cleaning agents stored near the company or construction site should be properly stored.


1. Cleaning agents should be designed for high temperatures, sources of ignition, and children.

2. The remaining cleaning agents during construction should be properly stored to prevent them from being spilled or allowed to evaporate and contaminate the environment, and to prevent them from being misused or ingested due to random placement.

3. For used and contaminated adsorbent materials, it is necessary to handle them properly. For example, for adsorbent materials contaminated with peroxides, it is best to soak them in water to avoid spontaneous combustion. For adsorbent materials contaminated with flammable solvents, it is best to put them in plastic bags and take them to a safe location for unified treatment.

Prepare a safety emergency response plan


Before cleaning construction, an emergency response plan should be prepared in advance and implemented by every construction personnel for emergency use. The emergency response plan includes:

1. Understand the latest water sources

When the cleaning agent comes into contact with the skin or splashes into the eyes, it can be cleaned promptly with a large amount of water.

2. Understand necessary first aid methods

When someone accidentally drinks a cleaning agent, immediately induce vomiting, dilute with plenty of water, and quickly dial 120 to send it to the hospital for treatment.

3. Familiar with basic firefighting knowledge

Common foam fire extinguishers shall be used. When chemicals such as solvents catch fire, sand and other materials shall be used as far as possible to cover and extinguish the fire, so as to avoid chemicals floating on the water surface and flowing to other places due to water washing.

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