Abstract
A solution polymerization method has been used to synthesize a polyacrylic-type superabsorbent polymer (SAP). The influence of various influential factors, such as the temperature, neutralization degree, cross-linking agent, and initiator, on the water absorption capacity of SAP has been investigated. The results show that the absorption can display a non-monotonic behavior depending on the synthesis conditions. The absorption can also change according to the pH, ion types and ion concentration. As the pH value increases, the water absorption capacity decreases significantly. It also decreases if the Na+ concentration becomes higher and becomes particularly low in solutions containing Mg2+. With the addition of SAP, the compressive strength of cement mortar decreases; the internal relative humidity can be maintained at 96% within 200 hours; and autogenous shrinkage can be reduced by nearly 69%.
Highlights
High-performance and high-strength cement-based materials [1,2] have been widely used in large-scale projects such as ultra-long and large-span structures and ultra-high-rise buildings, and continue to expand their applications to complex environments, such as oceans, underground and high altitudes
It can be studied that the water absorption rate of Superabsorbent polymer (SAP) increases as the temperature increases from 50°C to 65°C, and decreases after 65°C
AA monomer cannot be effectively converted into a cross-linked structure and part of the polymer chain is water-soluble, it will dissolve in contact with water and cannot form a complete chain, resulting in a low water absorption rate of the synthesized SAP
Summary
High-performance and high-strength cement-based materials [1,2] have been widely used in large-scale projects such as ultra-long and large-span structures and ultra-high-rise buildings, and continue to expand their applications to complex environments, such as oceans, underground and high altitudes. Low waterbinder ratio is the main technical means for cement-based materials to achieve high strength and high durability. It is generally believed that the durability of high-performance cement-based materials is great, but a low water-to-binder ratio will lead to poor crack resistance of high-performance cement-based materials. Autogenous shrinkage and self-desiccation due to water consumption [3] are the main reasons for the early cracking of cement-based materials. SAP [6] is a polymer containing strong hydrophilic groups such as carboxyl (-COOH) and hydroxyl (-OH) [7,8], which can form hydrogen bonds with water molecules.
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