Flowability and Compressive Strength of Lime Stone Calcinated Clay Cement based ECC

This article helps to determine the exact flowable behaviour and compressive strength of Lime stone calcinated clay cement based Engineered cementitious composite. To make more sustainable and flowable ECC, cement is replaced with lime stone calcinated clay cement and PVA fibres are replaced with polypropylene fibres. Incorporation of fibres improves the toughness of casted specimen. Compressive strength test was performed to investigate the hardened property of ECC. In addition, flow table test was done to investigate the green properties of LC3 based ECC. Experimental studies showed higher flowability of the LC3 based ECC with PP fibre was at low fibre content. This research article recommends the use of LC3 based ECC with the pp fibre in case of self-compactable ECC with little modifications. Looking forward, further attempts could provide quite beneficial to the literature.

Investigation on alkali activated fly ash and slag concrete using neutral grade water glass as activator

The utilization of cement in concrete was an ancient method as well the utilization of cementitious materials in concrete not only improves mechanical properties but also improves workability and durability etc., Today urbanization expands in many folds, so that the usage of cement became more due to this the production of cement increases. The production of cement on one hand affects the environment in form of Carbon dioxide gases on other hand depreciation of raw materials like lime stone and sand etc. Globally many construction industry and researches focussed in reduction of cement content in concrete by production of new alternatives like Geo polymer concrete etc. In this investigation Alkali-Activated Fly Ash slag concrete (AAFSC) is introduced as an alternative for ordinary Portland cement concrete (OPCC). Researchers developed AAFSC with NaOH and Na2SiO3 as activators. In this study AAFSC produced is with neutral grade sodium silicate solution with silica modulus 2.9 (Ms).For production of AAFSC the quantity of binder content is 500kg/m3 by varying binders proportions like Fly Ash and GGBS along with solution/binder ratios varying from 0.6 to 0.7. During this experimental investigation the workability and compressive strength of AAFSC is tested.

In Situ Combustion Synthesis in Air of Calcium Titanate Powders Using Minerals as a Calcium Source

Calcium titanate (CaTiO3) was synthesized through combustion in air from calcium sources of raw minerals (lime-stone and calcite), anatase titanium dioxide (A-TiO2) and magnesium (Mg). The syntheses were divided into two reactant systems (lime-stone/A-TiO2/Mg and calcite/A-TiO2/Mg. Before synthesis, the raw minerals and A-TiO2 were high-energy milled for 30 min. These powders were then separately mixed with Mg by ball milling. After synthesis, the as-combusted products were leached with 2 M HCl solution to remove by-products and impurities. A sequential mechanism for the in-situ combustion was proposed by using data from simultaneous thermal analysis (STA) together with thermodynamic values calculated with HSC software. XRD results showed that the as-leached products from both reactant systems mainly contained CaTiO3. FT-IR spectroscopy indicated that the as-leached products had Ca-Ti-O and Ti-O functional groups. In addition, SEM observation of the as-leached products revealed cuboid-like crystals with a particle size of about 100 nm.

Impact of Lime Stone on Groundwater and Soil

Unpredictable rapid increased growth of population with increased lifting of water from the deeper crusts of earth leads severe groundwater contamination and also unrepairable damage to soil structure and its stability. The extent and severalty of damage to the groundwater and the soil depends on the nature and the toxicity of the pollutants. It is very difficult to identify exact sources of groundwater contamination as the sources are hidden from the sight even the sources are predicted it is difficult to measure the extent of damage to the groundwater and soil. Taken to consider it, the present study was carried out at Piduguralla municipal region, Guntur district Andhra Pradesh which is surrounded by limestone beds. Due to the availability and the abundance of natural lime stone the area is very much familiar with other name as ‘Lime city’ which is surrounded by number of lime stone and white cement industries. It was observed that chemicals from lime stone quarries damaging quality of both groundwater and the soil. Twenty five sampling locations were identified to collect groundwater samples along with ten soil sampling locations. Samples were collected for three times during the study period of three months and the average values were noted as final values, water quality results were correlated with IS5000 – 2012 standards to find out the suitability of water consumption, all the tests for both groundwater and the soil were carried out by adopting standard analytical procedures.

Selection of a dedusting system for the lime stone preparation plant in the deposit "Zagradje-5"

This paper presents an example of a dedusting system in the deposit "Zagradje-5" with the use of two different dedusting systems in order to more efficiently removal of harmful dust from the plant. The analysis is done by calculation and is a universal method of calculating the dedusting system, the results of which are necessary to verify the reliable operation of selected equipment. The technical characteristics of the filter and deduster as well as the technological scheme of dedusting are also given.

Impact of Retention of Slump on Growth of Ready Mixed Concrete

In these days the Ready Mixed Concrete (RMC) plants were giving a back bone support for construction and concrete industries. As the infrastructure increases, concrete demand also increasing proportionately due to huge benefits of concrete, consequently, number of ready mixed concrete plants were also increase proportionately to supply the concrete according to the demand. Those who are fed up with the site mixing and environmental problem associated with them, they are opting for RMC. The growth of RMC is increasing from metropolitan cities to villages. One of the key factors for the growth of RMC is retention of slump till reach the construction site by using super plasticizer. In the present study, the growth of RMC industry from 1990’s in India was presented. An experimental study was done on Slump retention capacity of concrete with fly ash, GGBS and lime Stone powder with 0.4% of admixture dosage.