Construction method of cement floor grinding:

1. Base course requirements: the sanded ground shall be cleaned, free of floating ash, and kept dry (damp is allowed, and no open fire is allowed). The damaged parts shall be first hardened and wear-resistant treated, and then repaired with 302N high-strength repair material. The repaired parts shall be subject to a layer of enhanced wear-resistant treatment.

2. Hardening and wear-resisting treatment: spray or brush sanding treatment agent directly to ensure full infiltration and absorption, and replenish the treatment agent absorbed at any time within 30 minutes to maintain the infiltration state.

Generally, the ideal effect can be achieved after 3-4 days of natural reaction and curing.

3. Reference dosage: generally 0.3-0.8/m2 according to the sanding condition of the ground

Reasons for sanding of cement floor

1. The water cement ratio is too large: that is, the amount of water in the mixed concrete is large, which causes bleeding on the concrete surface and reduces the strength of the concrete surface.

2. The grading of sand and stone materials is unreasonable, and the mud content is high: the grading of aggregate is unreasonable, and too fine soil and sand are also easy to cause sand on the ground, affecting the early hydration of cement and the setting of concrete.

3. Excessive vibration during construction: increase the bleeding of concrete surface, resulting in low strength of concrete surface.

4. Improper curing: failure to cure in time or insufficient curing, exposure to the sun or strong wind causes a large amount of water loss on the concrete surface, and the surface is not fully hydrated, resulting in low strength.

5. Other reasons: poor control of calendering time, getting on the concrete surface before reaching a certain strength, freezing of concrete surface under low temperature, etc.

Treatment method for grinding and sanding of cement floor

Beijing Cement Ground Polishing Company: Interfacial agent is often used on the construction site to mix cement for coating and scraping, hoping to cover the sanding part. In fact, this will not achieve the desired effect. Generally, the surface will crack, peel off and shell a large area after drying. This is due to the fact that the base course has not been properly treated. It is totally wrong to want to achieve the effect of repair by covering the powdery base course.

The [1] cement ground sanding treatment agent of Beijing Junjing Project Crack Treatment Center is a new type of material specially developed for concrete sanding and dusting, which can be treated by painting on the concrete surface.

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