PMID- 18718710
OWN - NLM
STAT- MEDLINE
DCOM- 20090413
LR  - 20161125
IS  - 1873-3336 (Electronic)
IS  - 0304-3894 (Linking)
VI  - 163
IP  - 2-3
DP  - 2009 Apr 30
TI  - Physio-chemical reactions in recycle aggregate concrete.
PG  - 823-8
LID - 10.1016/j.jhazmat.2008.07.031 [doi]
AB  - Concrete waste constitutes the major proportion of construction waste at about 
      50% of the total waste generated. An effective way to reduce concrete waste is to 
      reuse it as recycled aggregate (RA) for the production of recycled aggregate 
      concrete (RAC). This paper studies the physio-chemical reactions of cement paste 
      around aggregate for normal aggregate concrete (NAC) and RAC mixed with normal 
      mixing approach (NMA) and two-stage mixing approach (TSMA) by differential 
      scanning calorimetry (DSC) and scanning electron microscopy (SEM). Four kinds of 
      physio-chemical reactions have been recorded from the concrete samples, including 
      the dehydration of C(3)S(2)H(3), iron-substituted ettringite, dehydroxylation of 
      CH and development of C(6)S(3)H at about 90 degrees C, 135 degrees C, 441 degrees 
      C and 570 degrees C, respectively. From the DSC results, it is confirmed that the 
      concrete samples with RA substitution have generated less amount of strength 
      enhancement chemical products when compared to those without RA substitution. 
      However, the results from the TSMA are found improving the RAC quality. The 
      pre-mix procedure of the TSMA can effectively develop some strength enhancing 
      chemical products including, C(3)S(2)H(3), ettringite, CH and C(6)S(3)H, which 
      shows that RAC made from the TSMA can improve the hydration processes.
FAU - Tam, Vivian W Y
AU  - Tam VW
AD  - Griffith School of Engineering, Griffith University, PMB 50 Gold Coast Mail 
      Centre, QLD 9726, Australia. v.tam@griffith.edu.au
FAU - Gao, X F
AU  - Gao XF
FAU - Tam, C M
AU  - Tam CM
FAU - Ng, K M
AU  - Ng KM
LA  - eng
PT  - Journal Article
DEP - 20080715
PL  - Netherlands
TA  - J Hazard Mater
JT  - Journal of hazardous materials
JID - 9422688
RN  - 0 (Industrial Waste)
RN  - 0 (Minerals)
RN  - 0 (ettringite)
SB  - IM
MH  - *Chemical Phenomena
MH  - *Conservation of Natural Resources
MH  - *Construction Materials
MH  - Industrial Waste
MH  - Minerals/chemistry
MH  - Refuse Disposal/methods
EDAT- 2008/08/23 09:00
MHDA- 2009/04/14 09:00
CRDT- 2008/08/23 09:00
PHST- 2008/03/04 00:00 [received]
PHST- 2008/07/07 00:00 [revised]
PHST- 2008/07/08 00:00 [accepted]
PHST- 2008/08/23 09:00 [pubmed]
PHST- 2009/04/14 09:00 [medline]
PHST- 2008/08/23 09:00 [entrez]
AID - S0304-3894(08)01062-5 [pii]
AID - 10.1016/j.jhazmat.2008.07.031 [doi]
PST - ppublish
SO  - J Hazard Mater. 2009 Apr 30;163(2-3):823-8. doi: 10.1016/j.jhazmat.2008.07.031. 
      Epub 2008 Jul 15.