Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 164, Issue -, Pages 731-738Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.12.228
Keywords
Boron minerals; Cement setting; Colemanite; Early strength; Heat of hydration; Isothermal calorimetry; Leaching; Nanosilica; Neutron shielding; Retardation; Ulexite
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Funding
- National Centre for Research and Development in Poland [PBSII/A2/15/2014]
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Enhanced neutron radiation shielding capacity of protective structures can be achieved using cement based composites with boron-containing aggregates. Experimental tests were performed to evaluate the effect of boron aggregates (colemanite, ulexite, borax, boron carbide) and nanosilica on the setting time and hydration heat of cement in mortars using isothermal calorimetry. Boron leaching test from mineral aggregates were performed in water and saturated Ca(OH)(2) solution. Cement setting retardation effects were found qualitatively correlated with boron leaching from mineral aggregates. A linear dependence of compressive strength of borated mortars and heat released after 72 h of cement hydration was found. A maximum content of boron compounds in mortar, allowing for a systematical control of setting time, was evaluated. (C) 2018 Elsevier Ltd. All rights reserved.
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