Cement-based materials, especially those with low water-cement ratios, often experience premature cracking due to plastic shrinkage in the early curing stages. In this study, development mechanism of early-age cement paste, and crack control effect recycled paste powder on was quantitatively investigated using non-contacting two-dimensional digital image technology. The influence different repl...

Nowadays, low water-to-cement (w/c) ratio has been put into widespread use in engineering practice. However, w/c may give rise to high self-desiccation, which lead the decrease of early-age cracking resistance. Investigating impact on resistance is utterly meaningful better understand mechanism concrete. corresponding investigations remain lacking, especially when ring test utilized. In present...

Statistical inference in the wavelet domain remains vibrant area of contemporary statistical research because desirable properties of wavelet representations and the need of scientific community to process, explore, and summarize massive data sets. Prime examples are biomedical, geophysical, and internet related data. In this paper we develop wavelet shrinkage methodology based on testing multi...

The effect of using trimethyladamantyl-ammonium hydroxide (TMAAOH) as a silica-modifying admixture to induce early-age mineralization during alkali-activation metakaolin was investigated and reported herein. In all material formulations, the use TMAAOH induced mineralization, increased mixture stiffening in fresh state, lowered total heat reaction. activating solutions with silica moduli above ...

Reactive powder concrete (RPC) mixtures are reported to have excellent mechanical and durability characteristics. However, such concrete mixtures having high amount of cementitious materials may have high early shrinkage causing cracking of concrete. In the present work, an attempt has been made to study the simultaneous effects of three key mixture parameters on shrinkage of the RPC mixtures. ...

High performance concrete (HPC) requires a low water-to-cementitious materials mass ratio (w/cm), often with the inclusion of supplemental cementitious materials such as silica fume in the mixture, thus necessitating the use of a superplasticizer. Because of the low w/cm and rapid reaction at early ages, proper curing from the earliest time possible is very essential in HPC. Internal curing has...

RC structures get damaged over time due to several phenomenons such as shrinkage, thermal deformations, creep and corrosion. This damage starts at early age continues during the lifetime of structures. In order account for effects on seismic response structures, a research project combining both an experimental numerical part was conducted. part, two types portal frames that evolved either in e...