The interest regarding the ecologically obtained materials and the advanced technology lead to the research of new types of additives or ingredients that can successfully replace Portland cements ...when creating concretes or mortars. With the view that concrete and micro-concrete some remain competitive compared to other building materials their main properties require improvements. The present study consists in determining the mechanical properties of some mixtures that have in their consistency an ecological binder, manufactured from recycled industrial waste called "Kerysten". This gypsum based material was used mixed with Portland cement, sand, polypropylene fibers and water, to obtain a mineral matrix with superior workability, tensile and compression strengths higher than a regular concrete. In this paper the entire experimental procedure is described and the tests results play an important role on the behavior of this type of material. PUBLICATION ABSTRACT
The properties of concrete for civil engineering structures are directly connected to the binder properties, therefore the current developments tend to increase the concrete strength, also having in ...mind the decrease of energy consumption and the use of industrial waste in binder production. In Europe and as well worldwide the binders testing will have to be standardized enabling to characterize and use binders in all producing countries. The paper presents an update critical review on the experimental methodology aiming to evaluate the mechanical properties of mineral matrix according to the existing standards. PUBLICATION ABSTRACT
The obtained results of an experimental program concerning the mechanical properties and Young modulus of a mineral matrix are presented. The composite material, which is based on mineral matrix, can ...be reinforced with glass fibres in order to obtain structural elements with improved behaviour under loading. To assess the optimal mixture for composite structural elements, a good knowledge of mechanical properties is needed. The experimental program was conducted at the "Gheorghe Asachi" Technical University of Iasi, Faculty of Civil Engineering, Composite Materials Laboratory. Different mixtures have been tested during a period of six months. The testing methodology is in accordance with standard SR EN 196-1:2006. It was observed that the compressive and flexural strengths, as well as the modulus of elasticity, have slightly lower values compared to Ordinary Portland Cement (OPC) mineral matrix. However the workability of the mineral matrix with the new binder was highly improved compared to that of OPC mineral matrix. PUBLICATION ABSTRACT
The paper presents the prototype of the first Romanian Compressed Air Energy Storage (CAES) installation. The relatively small scale facility consists of a twin-screw compressor, driven by a 110 kW ...threephase asynchronous motor, which supplies pressurized air into a 50m
3
reservoir, of 20 bar maximum pressure. The air from the vessel is released into a twin-screw expander, whose shaft spins a 132 kW electric generator. The demonstrative model makes use of a 5m
3
water tank acting as heat transfer unit, for minimising losses and increasing efficiency and the electric power generated. Air compression and decompression induce energy losses, resulting in a low efficiency, mainly caused by air heating during compression, waste heat being released into the atmosphere. A similar problem is air cooling during decompression, lowering the electric power generated. Thus, using a thermal storage unit plays an essential role in the proper functioning of the facility and in generating maximum electric power. Supervisory control and data acquisition is performed from the automation cabinets. During commissioning tests, a constant stable power of around 50 kW with an 80 kW peak was recorded.
This paper presents the set-up needed for an experimental study regarding the shear structural behaviour of un-reinforced brick masonry walls, strengthened through both traditional and fibre ...reinforced polymer (FRP) based methods. Five brick masonry wall modules were designed and manufactured for this purpose. The aim of the experimental study is to quantify the effectiveness of various rehabilitation systems by comparing the structural response determined for the FRP strengthened modules with the one obtained for one module, which is left un-strengthened. In addition, a brick masonry module was strengthened through traditional methods. The advantages of the modern rehabilitation techniques may be observed by comparing the results of the FRP strengthened modules to the ones obtained for the traditionally strengthened one. Important aspects regarding the behaviour of masonry strengthened walls, such as the characterization of the failure modes, the identification of the ultimate forces and the displacement and characterization of the stress-strain state may be obtained and analyzed by performing the envisaged experimental program based on the proposed set up.
MODERN STRENGTHENING TECHNIQUES FOR MASONRY STRUCTURES Ghiga, Dan Alexandru; Tăranu, Nicolae; Enţuc, Ioana-Sorina ...
Buletinul Institutului Politehnic din Iași. Secția 6, Construcții, arhitectura,
03/2018, Letnik:
64, Številka:
2
Journal Article
Recenzirano
Odprti dostop
Masonry structures are the world’s earliest construction systems. Nowadays, it is roughly estimated that the masonry constructions occupy more than 70% of the world dwelling stock. Moreover, a ...significant part of these structures consist of heritage buildings exhibiting various types of damages. Research programs including numerical and experimental works have been conducted in order to develop new strengthening methods that can improve the structural response and the overall seismic performances of masonry structures with minimum use of resources. Thus, the modern retrofitting techniques use light weight and durable materials that can be easily applied in various strengthening systems. Many of the current retrofitting techniques that are applied to the masonry works are based on fibre reinforced polymer (FRP)composite products due to the indisputable advantages of these materials. This paper presents and describes the most recent developments related to the strengthening solutions and technologies of masonry structures.
Skin tumors and chronic inflammatory diseases such as psoriasis vulgaris due to their high incidence and their psychological impact represent worldwide public health problems. Clinical examination ...and several health-related quality of life instruments like Skin Cancer Quality of Life questionnaire, The Dermatology Life Quality Index -DLQI can be used in order to evaluate the severity of diseases. Furthermore, for improving patients`quality of life, a proper evaluation regarding the accuracy of diagnostic, follow-up and efficiency of therapy can be utilized. Imagistic methods like dermoscopy or cutaneous ultrasonography can be included in their protocols in order to obtain an optimized and individualized management, with appropriate assessment, tracking and increasing the effectiveness of therapy.
Vitamin D is recognized as a prohormone. The circulating serum level is mainly 25 (OH) - vitamin D which is considered deficient at values lower than 20 ng/ml. Due to the identification of its ...receptors in various cells, its immunomodulatory role is nowadays investigated, in the prevention and treatment of neoplasms, in autoimmune and cardiovascular diseases. In the United States, >50% of psychiatric inpatients have vitamin D deficiency. A growing body of literature has found associations between vitamin D deficiency and psychiatric illnesses, particularly depression.
The skin, an organ with high accessibility, represents the site of significant changes, with high social and psychological impact on the patient's quality of life, by its evolution poten-tial, but ...mainly by its aesthetic prejudice generated by the persistent/permanent lesions. The most eligible criteria of classifying hyperpigmentation are etiological: genetic associat-ed with endocrinological pathologies, metabolic diseases, post-inflammatory or infections diseases, but also with physical/chemical agents, tumor and idiopathic pathology. Regard-less of the etiological agents involved, all hypermelanoses are the consequence of melanic pigment excess, histologically localized in the dermis/epidermis, most often manifested secondary to quantitative disorders (increase in melanin production) and occasionally to qualitative disorders (increase in melanocytes activity). Often asymptomatic and chronic, cutaneous hyperpigmentation represents a real issue for the patients, because of its emo-tional and psychological consequences.
It is a well known fact that sexually transmitted diseases are one of the most widespread infections, more than one million cases daily are reported worldwide. They have an in-creased rate of ...comorbidity and mortality due to their complications and sequelae includ-ing reproductive health, pregnancy, neurological, psychiatric disorders and cancers. Their impact on patients' psychiatric status is certainly present and this article studies the main psychiatric disorders in sexually transmitted diseases. In this regard, neuropsychiatric manifestations in neurosyphilis are represented by delirium, psychosis and dementia. The quality of life of sexually infected individuals is often negatively affected by depression, apathy, attention deficit and alcohol use disorders. Therefore, a complex treatment includ-ing both, social support and psychotherapy, is needed and a multidisciplinary, dermatolog-ical and psychiatric approach is mandatory.
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