4.5　Lining Concrete

4.5.1　The category，grade and performance indicators of lining concrete shall conform to Table 4.5.1.

Table 4.5.1　Lining Concrete Categories，Grades and Performance Indicators

Note:performance indicators refer to the measured values before metal reinforcing fiber is mixed.

4.5.2　Performance test for lining concrete shall comply with the following requirements:

1　Bulk density shall be in accordance with the current national standard YB/T 5200:Dense Refractory Castables-Determination of Bulk Density and Apparent Porosity.

2　MOR and crushing strength shall be in accordance with the current national standard YB/T 5201:Dense Refractory Castables-Determination of Cold Modulus of Rupture and Cold Crushing Strength.

3　Linear change rate shall be in accordance with the current national standard YB/T 5203:Dense Refractory Castables-Determination of Linear Change.

4　Coefficient of thermal conductivity shall be in accordance with the current national standard YB/T 4130:Refractory Materials-Determination of Thermal Conductivity（Calorimeter）.

5　Erosion loss at ambient temperature shall be in accordance with the current national standard GB/T 18301:Refractory Products-Determination of Resistance to Abrasion Materials at Ambient Temperature.

6　Contents of Al2O3and Fe2O3shall be in accordance with the current national standard GB/T 6900:Chemical Analysis of Alumina-silica Refractories.

4.5.3　Portable water should be used for mixing lining concrete.Water temperature shall be determined based on the ambient conditions，and preferably 10 to 25℃.If other clean water is used，the content of chloride shall not be larger than 50mg/L，and pH value should be 6.5 to 7.5.