Cement ground grinding construction method:

1. Requirements for base course: clean the sanding ground without floating ash and keep it dry (moisture is allowed and no open fire is allowed). The damaged part shall be repaired with 302n high-strength repair material after hardening and wear-resistant treatment. The repaired part shall be subject to one more strengthening and wear-resistant treatment.

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

Generally 3-4 days, natural reaction curing can achieve the ideal effect.

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

Reasons for sanding of cement ground

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

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

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

4. Improper curing: failure to cure in time or insufficient curing, exposure to the sun or strong wind, resulting in a large amount of water loss on the concrete surface, insufficient hydration on the surface, resulting in low strength.

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

Treatment method for sanding of cement ground

Beijing cement ground grinding company: on the construction site, the interface agent is often used to stir the cement for coating and scraping, hoping to cover the sanding part. In fact, this will not achieve the expected effect. Generally, after drying, the surface layer will crack, peel off, and large-scale shelling. This is because the base course is not well treated. The base course is powdered. It is completely wrong to try to achieve the effect of repair by covering.

The [1] cement ground sanding treatment agent of Beijing JunJing engineering crack treatment center is a new type of material specially developed for concrete sanding and dusting, which can be treated by brushing on the concrete surface.

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