推荐回答(3个)
加气混凝土砌块专用砂浆是一种根据加气混凝土砌块多孔的特性研发的专用砂浆。
1.加气混凝土属于多孔结构,内部有许多气孔。质量好的气孔为密闭的圆孔,质量差的气孔为连续的通孔。加气混凝土孔隙率一般为65%~75%,最大可达80%。
2.采用传统砌筑法施工时,烧结实心黏土砖在砌筑前一天需用水浇透,使其吸足水,然后再用砂浆进行砌筑及抹灰。此时,砖表面的水已饱和,不再从砂浆中吸取水分,因而能保证砂浆中的水泥水化充分,强度正常发展,砂浆与砖能粘结牢固。
3.但对于加气混凝土来说,因加气混凝土吸水速度较慢,且吸水量较少,提前浇水湿透的方法不适用于加气混凝土。
4.当采用传统砂浆砌筑加气混凝土时,砂浆中的水分慢慢被加气混凝土吸收,导致水泥水化不充分,强度不能正常发展,砂浆粘结强度和抗压强度低,砂浆与砌块粘结不牢,从而影响砌体的质量,而抹灰层容易开裂、空鼓甚至脱落。
拓展资料:
加气混凝土砌块:
加气混凝土砌块是一种轻质多孔、保温隔热、防火性能良好、可钉、可锯、可刨和具有一定抗震能力的新型建筑材料。早在三十年代初期,中国就开始生产这种产品,并广泛使用。例如:上海国际饭店、上海大厦、福州大楼、中国人民银行大楼等高层建筑中。是一种优良的新型建筑材料,并且具有环保等优点。
参考资料:
百度百科-加气混凝土砌块
加气混凝土砌块专用砌筑砂浆,其主要解决了如下技术问题:
1)实现薄层粘结
普通加气混凝土粘结砂浆,因其砌筑灰缝较大,造成墙面的“热桥”存在,影响整个系统的保温性能。针对此问题我院专门研制了砌筑缝在3mm左右的薄层粘接砂浆,既改善了保温效果,同时还较大程度的节约了材料能源。
2)保证粘结强度
加气混凝土作为墙体结构材料,在薄层粘结的情况下,对于砌筑砂浆的保水性要求较高。这是因为加气混凝土的吸水率较大,为此我院专门对其保水性度进行了大量的试验及验证,使其粘接强度得到了保障。
3)解决施工问题
提高砂浆的保水性,主要通过增加纤维素醚来进行调节,而纤维素醚量的增加会造成砂浆的触变性变差,极大影响到加气混凝土的砌筑施工,因此,在研制该产品的过程中充分的考虑了一项重要内容,使其施工性能大大提高。
加气混凝土砌块砌筑、抹灰及饰面的施工工艺之砌筑砂浆。
(1)砌筑砂浆的质量应符合JC 890—2001《蒸压加气混凝土用砌筑砂浆与抹面砂浆》的技术要求。
(2)砌筑砂浆应掺入符合JC 890—2001《蒸压加气混凝土用砌筑砂浆与抹面砂浆》要求的砂浆外加剂,且砂浆应具有保水功能,以便于操作施工;硬化后变形较大,以抵消砌块的收缩变形。
(3)砌筑砂浆的湿密度应≤1 800 kg/m3 ,砂浆强度以2. 5 MPa或5. 0 MPa为宜,砂浆的富余强度也不宜过高。
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