Optimized formulation of waterproof coating based on polymer and sodium silicate-activated GGBS using Box Behnken design - Selection of additives
Optimized formulation of waterproof coating based on polymer and sodium silicate-activated GGBS using Box Behnken design - Selection of additives
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DOI：
10.1016/j.jobe.2022.105220
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发表时间：
2022-09
影响因子：
6.4
通讯作者：
Wenzheng Li;M. Cao;Jun Chang
中科院分区：
文献类型：
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作者：
Wenzheng Li;M. Cao;Jun Chang
聚合物和水玻璃活化粉状高炉矿渣防水涂料（PSS-GGBS防水涂料）是一种新型双组份防水涂料，由于施工简单、强度高、耐久性好，有望在建筑领域得到广泛应用。添加剂在决定PSS-GGBS防水涂料的性能方面起着至关重要的作用。因此，通过响应面法（RSM）设计了用于制备防水涂料的各种添加剂的最佳比例，以提高机械性能。结果表明，消泡剂、有机硅流平剂和分散剂的最佳用量分别占液相的0.86 wt%、0.56 wt%和0.56 wt%。此时防水涂料的拉伸强度和断裂伸长率分别达到2.40MPa和108.84%。实验结果与相应的预测数据完全吻合，防水涂料满足GB/T 23445-2009标准中Ⅱ类标准。添加助剂后，聚合物乳胶与硅酸钠活化的GGBS之间的交联更加充分。由于添加剂的添加提高了碱激活反应的程度，致密的C-S-H凝胶和具有强机械键的CaCO3晶体为涂层提供了高机械性能。
Waterproof coating based on polymer and sodium silicate-activated ground granulated blast-furnace slag (PSS-GGBS waterproof coating) is a kind of new two-component waterproof coating, which is expected to have a promising application in building field because of simple construction, high strength, and good durability. Additives plays a vital role in determining the properties of PSS-GGBS waterproof coatings. Thus, the optimum proportion of various additives for the preparation of waterproof coatings was designed via the response surface methodology (RSM) to enhance mechanical properties. Results show that the optimal dosage of the defoamer, silicone leveling agent, and dispersant is accounted for 0.86 wt%, 0.56 wt%, and 0.56 wt% of the liquid phase, respectively. In this case, the tensile strength and breaking elongation of the waterproof coating reach 2.40 MPa and 108.84%, respectively. The experiment results are in full agreement with the corresponding predicted data, and the waterproof coating fulfills the criteria of type Ⅱ in standard GB/T 23445–2009. The crosslinking between polymer latex and sodium silicate activated GGBS was more sufficient after adding additives. The dense C–S–H gels and CaCO3crystals with a strong mechanical bond, which is due to improvement of the degree of alkali-activated reaction induced by the addition of additives, contribute a high mechanical property to coatings.