Glass-fiber-reinforced cement (GRC) is a widely used decorative material for wall facades. Conventional GRC products have poor crack resistance, low construction efficiency, poor integration, and few environmental benefits, hence failing to meet the requirements of building industrialization. To realize an integrated composite wall made from GRC and precast lightweight concrete (PLC) with a lasting anticrack effect, the anticracking properties of GRC material as well as the connection mode of GRC and PLC layers were studied. Through long-term shrinkage test, the influence of fiber content, rubber powder content, and expansion agent content on the crack resistance of GRC material was systematically analyzed. At the same time, the influence of connection mode on the crack resistance of the GRC layer after compositing with precast lightweight concrete (PLC) was analyzed. The results showed that adding fiber can effectively improve the flexural strength of the GRC and reduce drying shrinkage, whereas adding rubber powder can effectively improve its toughness and crack resistance. The addition of U-type expansion agent (UEA) can impart the cement mortar with a certain degree of microexpansion performance and help improve the drying shrinkage of the GRC. Compared with other compounding methods, the smooth connection of the GRC and PLC can effectively reduce the shrinkage of the GRC surface layer and improve its crack resistance. So, the new GRC material has good crack resistance performance and facade effect. These research studies provide an experimental basis for the large-scale application of the panel, and it has great advantages in improving the efficiency of prefabricated building construction.

中文翻译：

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新型抗裂玻璃纤维增​​强水泥材料与轻质混凝土板集成复合技术

玻璃纤维增​​强水泥（GRC）是一种广泛使用的外墙装饰材料。常规GRC产品抗裂性差、施工效率低、集成度差、环境效益少，无法满足建筑工业化的要求。为实现具有持久抗裂效果的GRC与预制轻质混凝土（PLC）一体化复合墙体，研究了GRC材料的抗裂性能以及GRC与PLC层的连接方式。通过长期收缩试验，系统分析了纤维含量、胶粉含量、膨胀剂含量对GRC材料抗裂性能的影响。同时，分析了连接方式对预制轻质混凝土（PLC）复合后GRC层抗裂性能的影响。结果表明，加入纤维可有效提高GRC的抗弯强度，降低干缩率，而加入胶粉可有效提高其韧性和抗裂性。U型膨胀剂（UEA）的加入可以赋予水泥砂浆一定程度的微膨胀性能，有助于提高GRC的干缩。与其他复合方式相比，GRC与PLC的平滑连接可有效降低GRC表层的收缩，提高其抗裂性。因此，新型GRC材料具有良好的抗裂性能和立面效果。