如果你漫步在尼加拉瓜首都马那瓜市街头或附近村镇,会发现很多公用建筑、居民住宅、围墙、路面、排水沟、灌溉渠道和井壁等,不是用粘土砖砌筑,而是用条石建成。这种条石的规格很多,其中主要的是60cm×40cm×15cm。这种石材是凝灰岩。凝灰岩属于轻质岩,试样的试验结果为:SiO_2含量为51.25%;自然状态抗压强度为164.9kg/cm~2;吸水率为18.5%。 If you walk on the streets of Nicaragua’s capital, Managua, or in the nearby towns and villages, you will find many public buildings, residential buildings, fences, pavements, drainage channels, irrigation channels, and well walls. They are not made of clay bricks, but are made of stone. Completed. There are many specifications for this type of stone, of which the main one is 60cm x 40cm x 15cm. This stone is tuff. Tuff belongs to light rock, and the test result of the sample is: SiO 2 content is 51.25%; natural state compressive strength is 164.9kg/cm 2; water absorption is 18.5%.