1. Introduction Small-size Hollow Block Fly Ash and Silicate Medium- size Block §6.3 Wall Blocks

2. It is short for the fly ash silicate medium- size block. It is mainly made up of fly ash, lime, plaster and aggregate, which are stirred and cured in the water. The hydrated objects is formed similar to fly ash autoclaved brick by the interaction of the material and through autoclaving. Fly Ash and Silicate Medium-size Block

3. Specific shape size 880mm×380mm×240mm 880mm×430mm×240mm Fly Ash and Silicate Medium-size Block Main technical index According to JC238-91 Strength grades are divided into 2 types by compressive strength of cube specimen: 10 and 13. Blocks are divided into 2 types by apparent quality, size warp and dry shrinkage : B and C.

4. By compressive strength of cube specimen 1013 By apparent quality, size warp and dry shrinkage The first rate B The qualified rate C

5.  When the slag is used as the aggregate, the apparent density varied with aggregate is 1300 ～ 1550Kg/m³, thermal conductivity 0.45 ～ 0.582W/m·K, the dry shrinkage of the first-rate no more than 0.75mm/m, and that of the qualified no more than 0.90mm/m.  It is higher than that of cement concrete block and elasticity modulus is lower than that of the same strength.  Cube compressive strength, strength by carbonization, frost-resistant and density of fly ash block are shown in Tab.6.3.2. Main technical index

6. Tab.6.3.2Cube compressive strength, strength by carbonization, frost-resistant and density of fly ash block Item Index the tenth gradethe thirteenth grade Compressive strength Mpa Average value of 3 specimens is at least 10.0, minimum value of single is 8.0 Average value of 3 specimens is at least 13.0, minimum value of single is 10.5 Strength by manpower corbonization Mpa 6.0 at least6.0 at most Frost-resistant When frost and melting circulation is completed, the appearance must not appear loose, flaky, cracky, and the loss of the density must be no more than 20% Density （ Kg/m 3 ） 10% of design density at most

7. Applications  It can be used in walls, not for the acidity medium eroded parts of the buildings, nor for parts constantly exposed to the high temperature, such as main part of the cast iron, steel-making workshop, and boiler apartment.  The interior and exterior sides of walls should be white-washed or documented with other material to improve durability, heat insulation and sound absorption and prevent the exterior walls leakage.