Abstract
Superabsorbent polymers (SAP) are a new, promising class of chemical admixtures which offer new possibilities in respect of influencing the properties of cement-based materials in the fresh, hardening, and hardened states. Much research work has been done in the last two decades to set the stage for introducing this truly multipurpose agent into the practice of construction. In particular, three RILEM Technical Committees: 196-ICC, 225-SAP and 260-RSC contributed considerably to the related progress by coordinating and combining the efforts of international experts in the field. The major product of the RILEM TC 225-SAP work was the State-of-the-Art Report published in 2012. This comprehensive document covered all topics relevant to the application of SAP as a concrete admixture. Since then further important progress has been made in understanding the working mechanisms of SAP in concrete and the effects of SAP-addition on various concrete properties. The article at hand presents an update on the state-of-the-art and is the concluding document delivered by the RILEM TC 260-RSC.
Highlights
In the construction practice chemicals play a major role in the development of modern concreteM
It may be expected that a wider application of concretes with superabsorbent polymers (SAP) will be facilitated when the effects of SAP addition become predictable according to objective rheological criteria
Toropovs et al [98] reported that spalling occurred in concrete with only SAP, whereas no spalling occurred when PP-fibers were introduced in addition to SAP. These results suggest that the increased moisture content of concretes internally cured with SAP may have negative effects if concrete is subject to high temperatures
Summary
In the construction practice chemicals play a major role in the development of modern concrete. 80 Page 2 of 20 technologies by enabling a wide range of solutions for controlling the properties of cement-based materials at different stages of their evolution, from the fresh to the hardened state and between These chemical admixtures, such as superplasticizers, air-entrancing agents, or accelerators, allow the purposeful shaping of various features of concrete and, in so doing, producing superior performance characteristics. The article at hand is an update of the 2012 state-ofthe-art report book [5] It summarizes the progress in the research and development of superabsorbers related to application in cement-based building materials over the last nine years. It constitutes the concluding deliverable of the RILEM TC 260-RSC. Page 3 of 20 80 directions for future studies toward the application of SAP in the concrete industry
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