我国当前粉煤灰质量一般较差,达到国家标准Ⅰ级粉煤灰等级的还不多,未燃尽煤实际含量较高,烧失量较大,颗粒较粗,造成其制品干缩值、徐变值较大,再加上一些生产厂家技术、工艺落后,对粉煤灰体积安定性问题未解决好,生产出一些劣质产品,甚至在使用中出现质量问题.某单层砖混结构生产厂房采用粉煤灰砖砌筑(又名“水浸砖”),竣工后不久,发现山墙中间有细微裂缝,然后从中间呈垂直向上、下发展,缝的宽度 China’s current fly ash quality is generally poor, reaching the national standard level I fly ash level is not much, the actual content of unburned coal is higher, the larger the loss on ignition, the coarser particles, resulting in the product shrinkage, The relatively large creep value, coupled with the backwardness of some manufacturers’ technologies and processes, does not solve the problem of volume stability of fly ash, produces some inferior products, and even causes quality problems during use. The production of a single-layer brick-concrete structure The workshop was built with fly ash brick masonry (also called “water-impregnated bricks”). Shortly after the completion, it was found that there were subtle cracks in the middle of the gables, and then they developed vertically upwards and downwards from the middle. The width of the seams