✍ Scribed by John Bensted; Satya Prakash Varma
No coin nor oath required. For personal study only.
It is interesting to read the paper by van Aardt and Visser (1), who observed that Portland cement-dolomitic aggregate autoclaved mortars deteriorated rapidly during storage in %5 Na2SO 4 solution at 5°C giving much thaumasite as the soft pulpy mass. Similar water-cured mortars expanded and cracked, giving much ettringite, but only a little thaumasite and hence no pulpy mass. They also observed that siliceous aggregate mortar both autoclaved and cured in water did not form any thaumasite; cracking was due to formation of ettringite. At 25°C neither of the above mortars formed any thaumasite.
📜 SIMILAR VOLUMES
J.H.P. van Aardt's and S. Visser's experiments on reactions between calcium hydroxide and feldspars have more aspects of interest regarding cement-aggregate reactions than they refer to themselves in their paper.
## Ataxia-telangiectasia (A-T) is an autosomal recessive neurodegenerative disorder with multisystem involvement and cancer predisposition, caused by mutations in the A-T mutated (ATM) gene. To study genotypephenotype correlations, we evaluated the clinical and laboratory data of 51 genetically prov