Petrographic analysis of aggregates related to alkali-silica reaction

1984 ◽  
Vol 30 (1) ◽  
pp. 177-181
Author(s):  
G. Barisone
Keyword(s):  
Alkali Silica Reaction ◽  
Petrographic Analysis

GEOLOGICAL STUDY AND MINING PLAN IMPORTANCE FOR MITIGATING ALKALI SILICA REACTION IN AGGREGATE QUARRY OPERATION

2016 ◽  
Vol 78 (7-3) ◽  
Author(s):  
Edy Tonnizam Mohamad ◽  
Bhatawdekar Ramesh Murlidhara ◽  
Mohd Nur Asmawisham Bin Alel ◽  
Danial Jahed Armaghani
Keyword(s):  
Aggregate Demand ◽  
Peninsular Malaysia ◽  
Alkali Silica Reaction ◽  
Petrographic Analysis ◽  
Kuala Lumpur ◽  
Developing Regions ◽  
Geological Structures ◽  
Rock Types ◽  
Mine Plan

More than 80 million tonnes of construction aggregate are produced in Peninsular Malaysia. Majority of construction aggregate are produced from granite. Developing regions of Johor Bahru, Kuala Lumpur, Penang and Selangar utilize granite aggregates. Normally it is considered aggregates as non-alkali reactive. Geological study can identify various rock types, geological structures, and reactive minerals which contribute to Alkali Silica Reaction (ASR). Deformed granites formed through faulting results in reduction of quartz grain size. Microcrystalline quartz and phyllosilicates are found in granites in contact with country rocks. Secondary reactive minerals such as chalcedony and opal may be found in granite. Alkali Silica reaction is slow chemical reaction in concrete due to reactive silica minerals in aggregates, alkalis in cement and moisture. For long term durable concrete, it is essential to identify potential alkali silica reactive aggregates. Lack of identifying reactive aggregates may result spalling, cracking in concrete and ultimately ASR can result in hazard to concrete structure. This paper deals with geological study of any aggregate quarry to identify rock type and geological structures with laboratory test –petrographic analysis and bar mortar test can identify type of aggregates being produced. Mine plan with Surpac software can be developed for systematic working for aggregate quarry to meet construction aggregate demand.

scholarly journals Microscopic analysis of the alkali-silica reactivity of various origin fine aggregate

2020 ◽  
Vol 322 ◽  
pp. 01025
Author(s):  
Aneta Antolik ◽  
Daria Jóźwiak-Niedźwiedzka ◽  
Kinga Dziedzic ◽  
Karolina Bogusz ◽  
Michał A. Glinicki
Keyword(s):  
Microscopic Analysis ◽  
Mineralogical Composition ◽  
Standard Test ◽  
Test Method ◽  
Alkali Silica Reaction ◽  
Petrographic Analysis ◽  
Fine Aggregate ◽  
Thin Sections ◽  
Alkali Silica Reactivity ◽  
Selection Of

Alkali silica reaction (ASR) is a harmful phenomenon occurring as a result of chemical interactions between sodium and potassium hydroxides in the pore solution and reactive minerals contained in the aggregate. Reactive minerals like microcrystalline, cryptocrystalline or strained quartz dissolve in the alkaline solution and form an expansive gel product. Proper selection of concrete constituents is necessary to ensure the durability of concrete structures. The proper recognition of the aggregate mineralogical composition is a very important element in the process of selection of concrete components due to the risk of ASR occurrence. This paper presents the results of detailed microscopic analysis of alkali-silica reactivity of domestic fine aggregates of various origins. Six siliceous sands from different locations in Poland and one limestone sand were tested. Detailed petrographic analysis was performed on thin sections. In all siliceous sands micro- and cryptocrystalline quartz was recognized as a reactive mineral. Digital image analysis was performed for quantitative assessment of the potential of reactivity of sands. It revealed, that siliceous river sands were the most susceptible to an alkali-silica reaction, which was confirmed by mortar bar expansion test performed according to the standard test method.

scholarly journals Quartzite Mining Waste: Diagnosis of ASR Alkali-Silica Reaction in Mortars and Portland Cement Concrete

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7642
Author(s):  
Ivan Francklin ◽  
Rogério Pinto Ribeiro ◽  
Fernando Augusto Corrêa
Keyword(s):  
Mine Tailings ◽  
Microstructural Analysis ◽  
Alkali Silica Reaction ◽  
Petrographic Analysis ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Reactive Behavior ◽  
Negative Environmental Impact ◽  
Mitigation Methods

The main objective was to determine the deleterious potential of quartzite mining tailings subjected to different ASR alkali–silica reaction tests. The studies included petrographic analysis, chemical analysis of cements, expansion tests in mortar bars and concrete prisms, and microstructural analysis. Petrographic analysis of quartzites indicated high percentages of deformed quartz (95%), and were classified as potentially reactive. Two types of HES high early strength cement with alkaline equivalents of 0.749% and 0.61%, respectively, were selected. Of the 8 samples analyzed by the accelerated method in mortars, only 2 quartzite samples and 1 diabasium sample indicated potentially reactive behavior. The accelerated and long-term methods in concrete prisms proved to be effective and were consistent with the deleterious potential of the samples. All analyzed samples were diagnosed with the ASR gel. In the microstructural analysis, in addition to the ASR products, other expansive products of late ettringite were detected. Reaction mitigation methods are proposed so that quartzite waste can be used as an alternative aggregate in concrete, and thus contribute to the reduction of mine tailings and, consequently, reduce the negative environmental impact from mining.

The Pawnee Aquifer, Denver-Julesburg Basin, Northeastern Colorado

2017 ◽  
Vol 54 (1) ◽  
pp. 15-32
Author(s):  
Theresa Jehn-Dellaport ◽  
Tammi Renninger
Keyword(s):  
Total Dissolved Solids ◽  
Quality Data ◽  
Petrographic Analysis ◽  
Confined Aquifer ◽  
Water Quality Data ◽  
Well Drilling ◽  
Fine Grained ◽  
Water Wells ◽  
Geophysical Logs ◽  
Arkosic Sandstone

A partially defined and largely unexplored confined aquifer in Colorado, Nebraska, and Wyoming is identified regionally through interpretation of geophysical logs, well drilling, coring, petrographic analysis, and GIS interpretation. The aquifer is a fine-grained arkosic sandstone, with thickness ranging up to 1000 ft in some areas. The aquifer represents a significant water resource for ranching and other development in northeastern Colorado and may be a resource for Wyoming, and Nebraska. Nomenclature for this aquifer is suggested. Water wells penetrating the entire aquifer have produced up to 200 gpm. Water quality data is presented including total dissolved solids, boron, and microbial methane.

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