Abstract
This study assesses the possible use of local raw materials (clays) for producing expanded clay pellets and test the product with American standard for test materials (ASTM) and according to ASTM C 330.For using them as lightweight aggregate in different construction applications, like thermal insulation, lightweight structural concrete , decoration pieces ,etc. The clay was collected from Al-Anbar province. The clay was bloated at 1150 C° without adding any impurities ,just mechanical treatment and perfect firing program, in order to obtain good bloating coefficient that is related with firing parameters (access time, temperature, socking time).
 We got the results of the match determined by the American specification (ASTM C330) and in which is considered lightweight aggregate. We got density about (280 kg / m3) which is much less than that determined by ASTM where the aggregate lightly if the density is less than (880 kg / m3).
Highlights
The expanded clay pellets as a lightweight aggregates are an important and versatile materials, used in concrete mixtures to make lightweight concrete (LWA), which used in different applications such as curtain walls, shell roof floors, pre-cast and pre-stressed concrete [Satish Chandra and Leif Berntsson,2004].Today, lightweight aggregates are available in wide range of densities, size and strength
This study assesses the possible use of local raw materials for producing expanded clay pellets and test the product with American standard for test materials (ASTM) and according to ASTM C 330.For using them as lightweight aggregate in different construction applications, like thermal insulation, lightweight structural concrete, decoration pieces,etc
By using Liquid Limit Device show in figure (5).Amount of clay mixed with water and put in a standard cup, cut by a groove of standard dimensions after this the clay subjected to 25 shocks from the cup being dropped 10 mm with a rate of one shock per second, to find the liquid limit of the clay samples, this test according to ASTM( D 4318 )
Summary
The expanded clay pellets as a lightweight aggregates are an important and versatile materials , used in concrete mixtures to make lightweight concrete (LWA), which used in different applications such as curtain walls , shell roof floors , pre-cast and pre-stressed concrete [Satish Chandra and Leif Berntsson,2004]. Lightweight aggregates are available in wide range of densities, size and strength. This makes designers capable to design concrete with more options of densities and strengths for different applications. Expanded clay is a powdery building material with good thermal insulation properties and resistance to the external impacts. It is obtained by feeding clay in a rotary kiln at a temperature of (1150 ). In this temperature raw materials start bloat turning into light pellets with a porous and firm structure. 2.Study objective The objective of this research is to produce the lightweight expanded clay pellets from the local raw materials and compare to the specifications (ASTM C330)
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