Mortar bar test

J. A. Larbi, J. H. M. Visser, A study of the ASR of an aggregate with high chert content by means of ultra-accelerated mortar bar test and... 

Considering the petrographic characteristics of the studied rocks, the main source of soluble silica is volcanic glass and cryptocrystalline silica (tri-dymite) caused by glass alteration. The presence of expansive clays can contribute to increase the expansion values in the accelerated mortar bar test method. 

In order to determine the potential alkali reactivity of aggregates to undergo ASR, mortar bar tests as per ASTM-C-1260 were carried out and their results indicated that their expansions were well below 0.10% thereby indicating their innocuous behaviour. 

Shayan, A., Morris, H. (2001) A comparison of RTA T363 and ASTM C1260 accelerated mortar bar test methods for detecting reactive aggregates . Cement and Concrete Research, 31 655-663. 

Ross, C. A., Thompson, R Y., Tedesco, J. W. (1989). Split-Hopkinson Pressure-Bar Tests on Concrete and Mortar in Tension and Compression. Aci Materials Journal, 86,475-481. 

Petrographical studies on thin sections and X-ray diffraction were made and the results obtained were compared with the behavior of these aggregates in structures in service and with standard test methods (accelerated mortar bar method, ASTM 1260 and dissolved silica determined according to chemical... 

These results correlate with the dissolved sihca and the expansion in the mortar bars determined in previous works using standardized test methods. 

ASTM C227. 2010. Standard Test Method for Potential Alkali Reactivity of Cement-Aggregate Combinations. (Mortar-Bar Method). Annual Book of ASTM Standards (04.02) 6 pp. 

ASTM International. C1260-05a. Standard test method for potential alkali reactivity of aggregates (mortar-bar method). ASTM International, West Conshohocken (PA), 2005. 

ASTM C 1260-07 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar Bar Method). 

C 1038 Test Method for Expansion of Portland Cement Mortar Bars Stored in... 

Masonry) Mortar Material used to bind together building blocks. Mortar is workable when freshly mixed with water and hardens over time. Modern mortars are usually a mix of portland cement, sand and water. Mortar bars of specified composition and dimensions are often used as testing material in standardised testing procedures. 

Method of test for bond of polymer-modified mortar to reinforcing bar... 

The European organization for standards (Comite European de Normalisation-CEN) is considering a harmlessness test method based on polarizing steel embedded in a mortar, made with a cement with less than 5 % C3A, to +260 mV versus a saturated calomel electrode [39]. Admixtures would be tested to see if they gave detrimental effects (high currents, and corrosion damage on the bar) relative to a mortar without admixture. This method is still in committee at this time. 

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