scholarly journals Smartphone Application for Determining the Segregation Index of Lightweight Aggregate Concrete

2021 ◽  
Vol 13 (22) ◽  
pp. 12564
Author(s):  
Antonio José Tenza-Abril ◽  
Patricia Compañ-Rosique ◽  
Rosana Satorre-Cuerda ◽  
Afonso Miguel Solak ◽  
Daniel Gavotti Freschi
Keyword(s):  
Mobile Application ◽  
Lightweight Aggregate ◽  
Concrete Specimen ◽  
Smartphone Application ◽  
Lightweight Aggregate Concrete ◽  
Mixing Times ◽  
Segregation Index ◽  
Aggregate Concrete ◽  
Strength And Durability ◽  
Image Analysis Techniques

Due to the low density of the aggregates and the longer mixing times, lightweight aggregate concrete (LWAC) is susceptible to segregation of the aggregates. Several studies have proposed different methods to estimate the segregation of concrete because segregation affects strength and durability in structures. Image analysis techniques have become very popular for quickly analysing different materials and, together with the widespread use of mobile applications, can make it much easier for engineers to obtain parameters that identify concrete segregation. The aim of this work was the development of a mobile application to photograph the section of a concrete specimen and indicate the segregation values. A simple, fast, and effective application was implemented, and the results were validated with other previously published results, which can facilitate the task of engineers and researchers to determine the segregation of concrete.

An Investigation on the Interfacial Transition Zone of Lightweight Aggregate Concrete

2013 ◽  
Vol 753-755 ◽  
pp. 610-615
Author(s):  
Hsi Chi Yang ◽  
Miao Ying Cheng
Keyword(s):  
Transition Zone ◽  
Lightweight Aggregate ◽  
Concrete Specimen ◽  
Pozzolanic Reaction ◽  
Normal Weight ◽  
Interfacial Transition Zone ◽  
Lightweight Aggregate Concrete ◽  
Hydration Products ◽  
Aggregate Concrete ◽  
Shihmen Reservoir

The technique of linking the SEM photographs taken around the interfacial transition zone area is applied to observe the development of hydration products for lightweight aggregate and paste at the different curing ages. This research first determines the mixture proportions of the two types of concrete specimens with different aggregate unit weights. The lightweight aggregate used is the sludge kilned aggregate from Shihmen reservoir. The very small SEM samples to be observed are taken from the concrete compressive test specimens and must include both aggregate and paste. The research then observes the hydration products (such as CH, C-S-H) of calcium ion and the pozzolanic reaction on the samples. Finally it assesses if the aggregate will produce ion exchange with cement and generate the hydration products. The hydration products on either side of the interface with a range of 100μm are observed using 2000x magnification. From the results, it is found that (1) the development of hydration products of the lightweight aggregate concrete is similar to that of the normal-weight aggregate concrete, (2) the failure at the 91 days age is that the lightweight aggregate is sheared, (3) the bond stress of aggregate and paste is controlled by hydration products of paste, (4) the aggregate has not interacted with cement paste to produce hydration products, and (5) the development of hydration products proves that the amount of binder used in the concrete specimen will affects its compressive strength.

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