CO2 curing for improving the properties of concrete blocks containing recycled aggregates

Abstract A CO2 curing process was adopted to cure concrete blocks made with recycled aggregates. Non-load- and load-bearing blocks were prepared with 0%, 50% and 100% recycled aggregate to replace natural aggregate. The blocks were then placed in a pressurized 100% CO2 curing chamber for 6, 12 and 24 h. The temperature and relative humidity inside the chamber were monitored, and the moisture loss and CO2 curing degree were determined by a weighing method. After the curing process, the strength and drying shrinkage of the CO2 and moist cured blocks were measured. The CO2 cured blocks attained higher compressive strength and lower drying shrinkage than the corresponding moist cured blocks. However, curing time and amount of recycled aggregate present in the blocks had insignificant effects on the strength gain and CO2 curing degree.

[1]  C. Poon,et al.  Properties of concrete blocks prepared with low grade recycled aggregates. , 2009, Waste management.

[2]  R. L. Berger,et al.  Acceleration of Hydration of Calcium Silicates by Carbon Dioxide Treatment , 1972 .

[3]  Y. Shao,et al.  CO2 sequestration using calcium-silicate concrete , 2006 .

[4]  S. Simons,et al.  A review of accelerated carbonation technology in the treatment of cement-based materials and sequestration of CO2. , 2004, Journal of hazardous materials.

[5]  D. Wattanasiriwech,et al.  Paving blocks from ceramic tile production waste , 2009 .

[6]  B. V. Venkatarama Reddy,et al.  Steam-cured stabilised soil blocks for masonry construction , 1998 .

[7]  Jing Wen Chen,et al.  Strength and Elastic Modulus of Carbonated Concrete , 2005 .

[8]  R. L. Berger,et al.  Accelerated curing of cementitious systems by carbon dioxide: Part I. Portland cement , 1972 .

[9]  Caijun Shi,et al.  Studies on some factors affecting CO2 curing of lightweight concrete products , 2008 .

[10]  R. L. Berger,et al.  Reactivity and strength development of CO2 activated non-hydraulic calcium silicates , 1979 .

[11]  Caijun Shi,et al.  Weathering properties of CO2-cured concrete blocks , 2012 .

[12]  S. Teramura,et al.  Development of a CO2 solidification method for recycling autoclaved lightweight concrete waste , 2001 .

[13]  J. Khatib,et al.  Properties of concrete incorporating fine recycled aggregate , 2005 .

[14]  J. F. Young,et al.  Accelerated Curing of Compacted Calcium Silicate Mortars on Exposure to CO2 , 1974 .

[15]  Qingyuan Wang,et al.  Use of wastes derived from earthquakes for the production of concrete masonry partition wall blocks. , 2011, Waste management.

[16]  D. Sadek.  Physico-mechanical properties of solid cement bricks containing recycled aggregates , 2012 .

[17]  Ján Jerga.  Physico-mechanical properties of carbonated concrete , 2004 .

[18]  Y. Shao,et al.  Carbonation Curing of Slag-Cement Concrete for Binding CO2 and Improving Performance , 2010 .

[19]  R. L. Berger,et al.  Reaction of Beta‐Dicalcium Silicate and Tricalcium Silicate with Carbon Dioxide and Water Vapor , 1979 .

[20]  Chi Sun Poon,et al.  Feasibility study of using recycled fresh concrete waste as coarse aggregates in concrete , 2012 .

[21]  Marios Soutsos,et al.  Use of recycled demolition aggregate in precast products, phase II: Concrete paving blocks , 2011 .

[22]  Chi Sun Poon,et al.  Paving blocks made with recycled concrete aggregate and crushed clay brick , 2006 .

[23]  Caijun Shi,et al.  Effect of pre-conditioning on CO2 curing of lightweight concrete blocks mixtures , 2012 .

[24]  Chi Sun Poon,et al.  The use of recycled aggregate in concrete in Hong Kong , 2007 .