灰砂砖是经压制成型的蒸压硅酸盐制品,六七十年代曾在北京、内蒙、湖北、四川等地盛行。固有的生产工艺除了使砖具有平整、美观的外形尺寸外,同时也带来了一些负面影响:砖的砌筑面密实光滑,吸收水分和排放水分的速度远慢于烧结粘土砖,使灰砂砖与砂浆的粘结强度被削弱,灰砂砖砌 Lime-sand bricks are press-formed autoclaved silicate products that were popular in Beijing, Inner Mongolia, Hubei and Sichuan in the 1960s and 1970s. The inherent production process not only gives the brick a flat, aesthetic appearance, but also brings some negative effects: the masonry surface of the brick is dense and smooth, absorbing moisture and draining water at a much slower rate than the sintered clay brick, making the lime sand The bond strength between brick and mortar is weakened.