The strength of aerated brick produced by aerated concrete block equipment is affected by the raw materials of aerated brick
October 18, 2021
1. Cement. The main inspection indexes of cement are as follows: stability, fineness, standard consistency, water consumption, setting time, flexural strength and compressive strength. The strength of aerated brick depends on its components: the comprehensive effect of hardened cement paste, interface transition zone and aggregate strength, and the cement strength is closely related to the strength of aerated brick equipment block, The factors affecting the cement strength also affect the strength of aerated brick blocks.
2. Fine aggregate. Fine aggregate has a great impact on the strength of aerated brick mainly due to the fineness modulus and mud content. The finer the sand is, the more unfavorable it is to the strength of aerated brick. The increase of mud content not only affects the strength of aerated brick, but also adversely affects the frost resistance and other characteristics of aerated brick.
3. Coarse aggregate. The main factors affecting the strength of aerated brick equipment block by coarse aggregate include orthopedic strength, mineral composition, large particle size and so on. Because the strength of aggregate is much higher than that of cement slurry matrix and interface transition zone, the strength of aggregate has not been fully utilized. Only when the strength of cement slurry matrix and transition zone is higher than or close to the strength of aggregate, it is necessary to seriously consider the strength of aggregate. Secondly, the different composition of aggregate minerals will also affect the strength of aerated brick blocks. The increase of the needle and flake content of the aggregate will have a great adverse impact on the aerated brick block, because the needle and flake orthopedics has large surface area and large internal friction. When the content increases, it will increase the surface area and porosity of the coarse aggregate, reduce the fluidity of the aerated brick mixture, and aggravate the phenomenon of dew stone and segregation. Needle flake particles will not only affect the workability, cement dosage and strength of aerated brick block, but also affect its durability. How to place the embryo in the mold of aerated concrete production line will deteriorate the performance of aerated brick block, increase the porosity of aggregate and increase the unit water consumption and deformation.
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