The alkali-silica reaction: mineralogical and geochemical ..

(a) the alkali content of the Portland cement
(b) the use of pulverised fuel ash as a cement replacement material
(c) the amount of reactive aggregate
(d) the free water content of the mix

The reaction can lead to alkali-silica gel formation, which can expand when absorbing water.

NRC-HQ-60-14-G-0010 from the Nuclear Regulatory Commission (Laboratory tests to assess shear degradation in concrete due to ASR, prognosis for future expansion, and 3D seismic simulation of a nuclear containment vessel subjected to prior ASR strength reduction).


alkali-silica reaction, concrete, ..

(1986). A factorial approach to the study of alkali-silica reaction in concrete. (Unpublished Doctoral thesis, City University London)


ACI 210R RE Approved 2008 | Spillway | Erosion

shafaatian, 'innovative methods to mitigate alkali-silica reaction in concrete materials containing recycled glass aggregates', phd dissertation, pennsylvania state university, dec. this represents an important step toward the development of the chemo-mechanical model of asr as it experimentally confirms the validity of a commonly used assumption of the first order reaction adequately representing the kinetics of the reaction process. this mechanism involves the formation of the reaction products on the surface of the reactive aggregates, which prevents further hydroxyl ion attack of the particles. specifically, the study investigated the products formed by exposing reactive silica mineral (α-cristobalite) to the mixture of three alkalis solutions containing solid calcium hydroxide (ca(oh)2).

THE ROLE OF COAL COMBUSTION PRODUCTS IN MANAGING …

The chemical analysis results have shown that pulverised fuel ash tends to increase the alkali content of the mortar bars. This is discussed with respect to the mode of operation of pulverised fuel ash in inhibiting expansion due to alkali-silica reaction, which is considered to be one of chemical reaction and not a simple dilution effect. An explanation of the contribution of pulverised fuel ash and the differences noted between its use with Pyrex glass and Beltane opal is hypothesised in terms of the relative affinity of each of these three materials for reaction with the hydroxyl ion present in the pore fluids.

Phosphine and selected metal phosphides (EHC 73, 1988)

There is a strong resemblance of the observations made in the ASR-concrete to the features described from sedimentary-diagenetic sandstone compaction, and a similar process is suggested to occur in ASR.