The technical requirements for the technical grade, gloss and appearance of natural marble and granite shall be in accordance with 6.3.2 of the Standard for the Acceptance of Building Surface Engineering Quality GB50209-2002. It shall comply with the current national industry standards “Natural Marble Building Panel JC79†and “Natural Graniteâ€. Stone building panels JC205" provisions.
In the "natural marble building board JC79" 4.4.3, it is stipulated that the board is allowed to be bonded and repaired, and the decorative quality and physical properties of the board are not affected after bonding and repairing.
5.4.1 also stipulates: the sheet defects, the board is placed flat on the ground, the defects visible at 1.5m away from the sheet are defective; the defects that are not obvious at 1.5m from the sheet but visible at 1m are no obvious defects; Defects that are invisible from 1 m from the sheet are considered to be defect free.
In September 2008, with the approval of the National Standards Committee, the National Stone Standardization Technical Committee was established and the National Stone Quality Supervision and Inspection Center and the National Standardization Organization Natural Stone Technical Committee revised the Stone Standards Compilation.
According to this compilation, the requirements for the appearance quality of stone are:
1. The color of the same batch of stone should be basically adjusted, and the pattern should be basically the same;
2, the quality requirements of the appearance defects on the front of the layout should meet the following requirements: the crack length can not exceed 10mm, but the length of the rib is not more than 8mm, the width does not exceed 1.5mm; but the angular length does not exceed 3mm, the width does not exceed 3mm; the stain area is not More than 6 square centimeters; the diameter of the blisters does not exceed 2 mm.
3, marble plate allows bonding and repair, bonding and repair should not affect the physical properties of the board. According to this compilation, natural stone is allowed to be bonded and repaired, but for missing corners, the repair criteria for plate fracture are very strict.
Through the specification and related materials, the stone problem is allowed to be repaired.
During the construction of the project, the project can arrange skilled workers to repair the stone. For some difficult stone repairs, in order to ensure the effect of the repair, the manufacturer can be required to send professional stone repair personnel to the site, specifically responsible for repairing the stone.
Stone repair is a technically difficult job. He needs workers to tint, understand the characteristics of different stones, use different characteristics of glue, use different processing tools, know how to polish, and master the time of each process. . Doing this work not only reduces losses and reduces costs, but also saves labor costs while achieving aesthetic results.
Post-curing of stone
After using natural marble for a period of time, the color and smoothness will gradually decrease. Therefore, we need to negotiate with the owner and recommend that the owner carry out crystallization maintenance treatment of the stone.
Stone works are generally used in relatively high-end or important places, so to maintain long-term aesthetic and atmospheric effects, it is necessary to carry out professional maintenance work on marble floors. The most common and most used conservation now is the mirrored crystallization of stone floors, and this is the most effective conservation measure.
to sum up
The above is a summary of some common quality problems and some quality control techniques that I often encounter in the construction of marble floors.
Once the marble floor has quality problems, it is generally difficult to solve it by repairing. In order to ensure the quality and effect, the solution for more time is to rework, and the material cost of marble is less than a few hundred yuan and one square, and more than one thousand yuan. One square, if the rework is replaced due to the quality control problem of the project, it will cause huge economic losses to the project. Although the crystallization treatment on the ground can solve some quality defects, if the project Party A does not require it, the project will take the initiative to solve the quality problem. Crystallization, it will also cost a lot of money.
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