The alkali-silica reaction (asr) is an expansive chemical reaction that occurs between this thesis aims to develop a model that employs principles of. The bibb graves bridge in wetumpka, al has severe damage due to alkali-silica reaction (asr) in two of its reinforced concrete arches a mitigation procedure developed in the summer of 2010 by the fhwa, aldot, and auburn university was implemented during the fall of 2010. Effect of alkali-silica reaction expansion on mechanical properties of concrete a thesis submitted to. The alkali-silica reaction (asr) is an important problem that has yet to be completely understood owing to the complexity of this phenomenon, a number of studies have been conducted to characterize its kinetics, its impact on the material, and its structural consequences.
Digital image correlation analysis of alkali silica reaction in concrete with recycled glass aggregate welcome to the ideals repository. Alkali-silica reaction (asr) is a neutralization reaction that occurs between an acid (silicic acid) and a basic ph pore solution (calcium oxide, potassium oxide, and sodium oxide) asr causes deleterious expansion within concrete, which can cause durability issues decreasing the life span of concrete. Alkali silica reaction criteria for accelerated mortar bar tests based on field performance data lary r lenke 1 and l javier malvar 2 1 university of new mexico, department of civil engineering, msc01 1070, 1 university.
I alkali-silica reactivity and activation of ground perlite-containing cementitious mixtures a thesis submitted to graduate school of natural and applied sciences. Undergoing alkali-silica reaction (asr)” thesis (phd) affected by alkali-silica reaction” 18th international conference on structural mechanics in reactor. Effects and mechanisms of lithium nitrate on controlling alkali-silica reaction by xiuping feng a thesis submitted in partial fulfillment of the requirements for the degree of.
60733 alkali–silica reaction alkali–silica reaction is the deleterious chemical reaction between some siliceous minerals in the aggregate and the alkalinity of the concrete. Alkali-silica reaction (asr), the predominant type of alkali-aggregate reaction, is a deleterious reaction that causes expansion, cracking, and degradation of mechanical properties of concrete asr remains a major problem for concrete structures worldwide. Alkali–silica reaction the alkali–silica reaction (asr), more commonly known as concrete cancer, is a swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive non-crystalline (amorphous) silica found in many common aggregates, given sufficient moisture. Alkali silica reaction mitigation using high volume class c fly ash a thesis submitted in partial fulfillment of the requirements for the degree of.
Master thesis date of defense: march 17, 2016 committee members: farshad rajabipour, thesis advisor keywords: alkali-silica reaction alkali-activated fly ash pore. Chapter 2 alkali-silica reaction previous | table of contents | next 21 introduction this chapter provides an overview of the fundamentals of asr in concrete. The role of alumina in the mitigation of alkali-silica reaction by skyler j warner a thesis submitted to oregon state university in partial fulfillment of.
Di usion of the gel formed by alkali-silica reaction in concrete first it is create a model using the kinetics of chemical reactions this initial model consists. Influence of moisture on alkali silica reaction adeyemi damilare, adesina a thesis in the department of building, civil and environmental engineering. Paper deals with creep effects being combined with alkali-silica reaction (asr) in concrete at first description of reaction kinetics is discussed, then the creep model is presented based on model code 2010 (mc2010) approach an approximation of mc2010 analytical formulation in the form of kelvin chain is proposed.
Novel performance tests for evaluation of alkali-silica reaction a thesis in civil engineering by stephen b salwocki 2016 stephen b salwocki. Dcdescriptionabstract the influence of reinforcement on the development and distribution of multiaxial expansions in reinforced concrete elements due to alkali-silica reaction (asr) requires further research understanding how passive restraint provided by reinforcement in a given direction may. In the paste combined with silica from the aggregate, in a deleterious reaction dubbed ‘alkali–silica reaction phd thesis, university of rochester. Alkali-silica reactivity: an overview of research alkali-silica reaction cracking expansion portland cement concrete standards strategic highway research program.Download