Microstructure of cement paste subject to early carbonation curing

By Vahid Rostami, Y. Shao, A. Boyd, Zhen He. 2012

605 citations recorded by the source corpus.

Abstract Microstructure of Ordinary Portland Cement paste subjected to early age carbonation curing was studied to examine the effect of early carbonation on performance of paste at different ages. The study was intended to understand the mechanism of concrete carbonation at early age through the microstructure development of its cement paste. Early carbonation was carried out after 18-hour initial controlled air curing. The microstructure characterized by XRD, TGA, 29 Si NMR and SEM was correlated to strength gain, CO 2 uptake and pH change. It was found that early carbonation could accelerate early strength while allowing subsequent hydration. The short term carbonation created a microstructure with more strength-contributing solids than conventional hydration. Calcium hydroxide was converted to calcium carbonates, and calcium–silicate–hydrate became intermingled with carbonates, generating an amorphous calcium–silicate–hydrocarbonate binding phase. Carbonation modified C–S–H retained its original gel structure. The re-hydration procedure applied after carbonation was essential in increasing late strength and durability.

Subfields: Civil and Structural Engineering, Environmental Engineering, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/1b70c1ac9bae01cd289cce323fe0bf455a2b0f42

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Civil and Structural Engineering

1. R. Neves
2. Faiz Shaikh
3. Jorge de Brito
4. Ö. Cizer
5. J. Elsen
6. D. Gemert
7. S. Supit
8. F. Branco

In Environmental Engineering

1. Jorge de Brito
2. Faiz Shaikh

In Ocean Engineering

1. Faiz Shaikh
2. S. Supit

Citations in the corpus

• Mechanical and durability properties of high volume fly ash (HVFA) concrete containing calcium carbonate (CaCO3) nanoparticles (2014, background): “Mass loss between 105 C and 420 C represents the loss of combined water due to dehydration of calcium silicate hydrate, aluminate hydrate and ferroaluminate hydrate, between 420 C and 540 C corresponds to the dehydration of calcium hydroxide and de-carbonation of well-crystalline calcium carbonate o”
• Real-time investigation of reaction rate and mineral phase modifications of lime carbonation (2012, background): “Other studies rely on weight gain as a measure to predict the rate of carbonation reaction of lime with the production of CaCO3 [14,17,30–35].”