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Industrial Technical Requirements for granite
Nov 06, 2017

1. The main requirements of natural granite blocks:

Building Material Industry Standard (jc-204-92) the main requirements for natural granite blocks are as follows:

The waste material must have a right angle parallelepiped shape. The large surface of the waste material should be parallel to the jointed surface or pattern of the rock.

The size of the waste material requires a length greater than or equal to 140cm, a width greater than or equal to 60cm, a height greater than or equal to 60cm.

Appearance quality requirements with a batch of blocks of color, pattern, grain structure should be basically consistent. The quality requirement of the shortage angle, the lack of ribs, the crack, the color line and the color spot should conform to the requirements of table 4.24.6.

Physical performance requirements: the density is not less than 2.50g/cm3, the water absorption rate is not greater than 1%, the dry compression strength is not less than the 0MPa; bending strength is not less than 8.0MPa.

2. The quality requirements of acid and alkali-resistant granite:

(1) The quality of acid-resistant granite requires the main chemical constituents: sio2>70%~75%, the higher the content, the better acid resistance; al2o3>13%~15%; fe2o3<0.5%; cao<0.8%; mgo<0.4%; acid resistance is greater than 97.5%. Hard。 The resistance rate (compressive strength after 10~40 thermal change) is greater than that of the same. 2MPa, melting point 1610 ℃, expansion coefficient is less than 8x10-3, water absorption rate is less than 1.5%.

(2) Alkali-resistant granite quality requirements require Cao, MGO content is high, the higher the content of alkali resistance, some acid-resistant stone SiO2 content is high, but the porosity is small, can also be used as alkali-resistant stone.

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