Experimental Study of Elevated Temperature Effects on Properties of Nano Clay and Glass Fiber Concrete

Concrete is mostly use construction material. Concrete is composite material composed of fine and coarse aggregate bonded together with a cement paste that cure over time. Generally concrete is strong in compression and weak in tension. Concrete is brittle material and will crack when we increasing tensile force. Nano clay are nano-size particles of layered mineral silicates. Adding a nano clay is a could fill the original hydration products pores and colloid capillaries increase the cement paste density of concrete. Alkali-resistant glass fiber has a high degree of corrosion resistance in the environment of cement and other alkaline medium. Glass fiber gives high tensile strength. Objective of research is increase mechanical strength of concrete with use of nano clay (NC) and glass fiber (GF). In present study, Concrete grade use is M30.In study 2% of NC is fix replacement of cement and variation of GF is use 0.5%,1%,1.5% as admixture. Temperature effect give 80℃,180℃,300℃for 3 hours. After adding NC and GF check the difference test result like a slump, Compressive, split tensile and flexural strength test. The specimens will be tested on 3,7, and 28 days.

Quantification of Tremolite in Friable Material Coming from Calabrian Ophiolitic Deposits by Infrared Spectroscopy

The aim of this study is to identify the infrared absorption band suitable for quantifying tremolite in three powdered samples (fine, medium, and large size classes) coming from a quarry of ophiolitic friable rocks in the western part of the Calabria region of Italy. Three IR bands were considered: OH stretching band between 3700 and 3650 cm−1, the stretching bands of the Si-O-Si linkage between 1200 and 900 cm−1, and the absorbance band at 756 cm−1attributable to tremolite. The amount of tremolite in the test samples was quantified by using the curve parameters of the three analytical bands. The quantitative analysis of tremolite using the band due to OH stretchings (3700–3650 cm−1) and the bands attributed to the Si-O-Si stretchings (1200–900 cm−1) showed high values for all test samples. Their use overestimated the tremolite amount because both bands were affected at the interfering mineral silicates such as talc, kaolinite, chlorite, and serpentinites. The abundant presence of antigorite in studied samples mainly in medium size class sample had a key role in our findings. The band at 756 cm−1was not affected at the interfering minerals and can be used for quantitative analysis of tremolite in sample coming from ophiolitic deposits.

Sorption of heavy metals from industrial waste water by low-cost mineral silicates

The adsorption by different silicate minerals of some heavy metals, present in industrial waste water, has been studied. These adsorbents (mainly clay minerals) are readily available, inexpensive materials and offer a cost-effective alternative to conventional treatment of wastes from the metal finishing industry. The results show that some mineral species are suitable for the purification of such residual waters down to the limits prescribed by current legislation concerning industrial wastes. The Langmuir model was found to describe such adsorption processes best. Sepiolite (Orera, Spain) has an adsorption capacity of 8.26 mg g-1 for Cd2+, the capacities depending on the metal adsorbed in the order: Cd2+ > Cu2+ > Zn2+ > Ni2+. This mineral shows the highest sorption capacity relative to the other minerals studied. Factors in the reaction medium such as pH and ionic strength influenced the adsorption process.

Analysis of Asbestos Fibres in The Scanning Electron Microscope (SEM) by The Use of Electron Backscattering Diffraction (Ebsd).

Asbestos is a common name of a number of fibrous mineral silicates which differ in chemical composition. The asbestos fibres are classified into two groups: serpentine (chrysotile) and amphiboles (anthophyllite, amosite, actinolite, tremolite, crocidolite).Inhalation of asbestos dust fibres involves a health risk. It is therefore of great importance to develop quick and reliable methods to check for the presence of asbestos fibres in suspected materials. Some common analysis methods for asbestos detection are: optical microscopy scanning or transmission electron microscopies (SEM ,TEM) often combined with energy dispersive X-ray analysis (EDX) and selected area electron diffraction (SAED) in the TEM where the crystal structure is determined.The EBSD technique in the SEM has in this work been applied to achieve electron backscattering patterns (EBSP) from four types of asbestos fibres. The pattern quality has been studied as a function of specimen preparation and SEM settings.