The high specific gravity of concrete, which ranges around 2400 kg/m³, will affect the loading of relatively large and heavy structures. This will affect the total weight of the building which can lead to wasteful dimension of foundations which tend to affect the structural behavior in high earthquake areas; the more the weight of the structure, the greater the effect of the earthquake for the building. One alternative material to reduce the weight of the building is lightweight building materials, such as light brick. This study aims to determine the characteristic properties of mortar which is the lightweight brick base material by using the proportion of fly ash and rice husk ash as a substitute for heavy cement with the addition of aluminium powder and when the duration of steam curing is 6 hours at 60oC. The results of the maximum mortar compressive strength occur in a mixture of PC90%: Psr100%: FA10%: AP0%, which is equal to 13.5 MPa. As for the mortar with added ingredients in the form of aluminium powder, the maximum compressive strength of the mixture of PC90%: Psr100%: FA10%: AP0.2%, which is equal to 5.1 MPa. The correlation between specific gravity and compressive strength of mortar can be seen from the low value of specific gravity and high value of compressive strength on the mortar occurring in a mixture of PC90%: Psr100%: PS10%: AP0% with a value of 1.6 kg / cm2 and 5.1 MPa.
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机译：混凝土的高比重，其范围约为2400千克/毫升，将影响相对较大和重型结构的负载。这将影响建筑物的总重量，这可能导致浪费的基础尺寸，这往往会影响高地震区域的结构行为;结构的重量越多，建筑物的地震效果越大。一种减少建筑物重量的一种替代材料是轻质建筑材料，如轻砖。本研究旨在确定砂浆的特性，它是通过使用粉煤灰和稻壳灰的比例作为重质水泥的替代铝粉和蒸汽固化持续时间为6小时在60oC。最大砂浆抗压强度的结果发生在PC90％：PSR100％：Fa10％：AP0％的混合物中，其等于13.5MPa。至于砂浆的添加成分以铝粉的形式，最大抗压强度的PC90％：PSR100％：Fa10％：AP0.2％，等于5.1MPa。从PC90％的混合物中的比重和抗压强度的低值和高值的比重和抗压强度的低值可以看出砂浆的抗压强度之间的相关性：PSR100％：PS10％：PS10％：AP0％，值为1.6 kg / cm2和5.1 mpa。
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