The Experts below are selected from a list of 3564 Experts worldwide ranked by ideXlab platform
Miguel Ángel Sanjuán - One of the best experts on this subject based on the ideXlab platform.
-
EFFECT OF MIXES MADE OF COAL BOTTOM ASH AND FLY ASH ON THE MECHANICAL STRENGTH AND POROSITY OF PORTLAND CEMENT
Materiales de Construcción, 2013Co-Authors: C. Argiz, E. Menéndez, Miguel Ángel SanjuánAbstract:New additions to the cement are needed to achieve a more sustainable and Durable Construction Material. Within this context, bottom ashes can be used as a main constituent of Portland cements when it is mixed in an optimized proportion with fly ashes. The mechanical characteristics of standarized mortars made of mixes of pulverized coal combustion bottom and fly ashes are studied. The mortars were made of ordinary Portland cement (CEM I 42.5 N) and mixes of bottom ashes with fly ashes in similar proportions to those of CEM II/A-V, CEM II/B-V and CEM IV/A (V). Summing up, it can be said that the utilization of bottom ashes mixed with fly ashes in replacement levels from 0% to 100% do not affect significantively on the mechanical caracteristics of the mortars considered in the present study which had an addition maximum content of 35%.
Atorod Azizinamini - One of the best experts on this subject based on the ideXlab platform.
-
A theoretical analysis of mechanical and durability enhancement of circular reinforced concrete columns repaired with UHPC
Engineering Structures, 2020Co-Authors: Mahsa Farzad, Amir Sadeghnejad, Siavash Rastkar, Arash Moshkforoush, Atorod AzizinaminiAbstract:Abstract Ultra-high performance concrete (UHPC) has been promoted as a strong, Durable Construction Material which can provide a barrier to corrosion due to its low permeability, and can thus be an ideal Durable repair strategy for corrosion management. A UHPC based solution to enhance the mechanical strength of axially-loaded, sub-structural reinforced concrete elements, was proposed and experimentally investigated in an earlier study by the authors. The results recommended that depending on the UHPC shell thickness, this repair method may cause shifting of the critical section, which should be a design consideration. In this paper, the effect of the UHPC shell thickness on structural performance and durability of the retrofitted structure was numerically investigated. A well-established numerical sectional analysis method was utilized to estimate the capacity of the repaired section of prototype bridge columns with varying UHPC shell thicknesses, and a simplified method for predicting the structural enhancement of UHPC repair was proposed. Furthermore, analytical models were developed to predict the service life of the repaired sections by calculating the time required for chloride ions to reach the surface of the reinforcement.
A. N. Swaminathen - One of the best experts on this subject based on the ideXlab platform.
-
Indian Rice Husk Ash — Improving the strength and durability of concrete: A review
2013 International Conference on Current Trends in Engineering and Technology (ICCTET), 2013Co-Authors: A. N. SwaminathenAbstract:The objective of this paper is to study a review of Indian Rice Husk Ash (RHA) as a partial cement replacement in different percentage and performance of strength and durability of RHA blended concrete. The demand for producing Durable Construction Material is the result of the environmental pollution. Supplementary cementitious Materials prove to be effective to meet most of the requirements of Durable concrete, RHA is available in plenty to other supplementary Materials like silica fume and fly ash, Due to its high pozzolanic activity, both strength and durability of concrete are improved. This paper presents a over view of the work carried out on the use of Indian RHA to improve the strength and durability of concrete.
Miltiades Elliotis - One of the best experts on this subject based on the ideXlab platform.
-
Construction and Retrofit Methods of Stone Masonry Structures in Cyprus
The Open Construction and Building Technology Journal, 2016Co-Authors: Petros Christou, Miltiades ElliotisAbstract:Natural stone is a Durable Construction Material which has been used through centuries for various types of structures. These structures are exposed to corrosive and degradation factors such as climate change and pollution, natural ageing, earthquake actions, increasing urbanization and even human negligence, potentially exposing them to irreversible structural damage and loss. Considering the large number of traditional structures and the historic value of a great number of stone masonry structures, the necessity of maintenance, repair, retrofit and restoration of stone masonry structures is imposed. The process which leads to the preservation of such structures consists of three stages: 1) the in-situ and laboratory study of the degree of damage and of the factors which cause the natural damages on the Materials of these buildings, 2) the detailed drawing of the layout and the elevations. This stage also includes the selection of the appropriate measures for the maintenance and retrofits according to the special characteristics of the structure and the design of the intervention method, and 3) the execution of all the intervention works. This paper presents a description of various types of natural stones found in Cyprus, the most commonly used Construction methods as well as methods for the retrofit of stone masonry structures.
C. Argiz - One of the best experts on this subject based on the ideXlab platform.
-
EFFECT OF MIXES MADE OF COAL BOTTOM ASH AND FLY ASH ON THE MECHANICAL STRENGTH AND POROSITY OF PORTLAND CEMENT
Materiales de Construcción, 2013Co-Authors: C. Argiz, E. Menéndez, Miguel Ángel SanjuánAbstract:New additions to the cement are needed to achieve a more sustainable and Durable Construction Material. Within this context, bottom ashes can be used as a main constituent of Portland cements when it is mixed in an optimized proportion with fly ashes. The mechanical characteristics of standarized mortars made of mixes of pulverized coal combustion bottom and fly ashes are studied. The mortars were made of ordinary Portland cement (CEM I 42.5 N) and mixes of bottom ashes with fly ashes in similar proportions to those of CEM II/A-V, CEM II/B-V and CEM IV/A (V). Summing up, it can be said that the utilization of bottom ashes mixed with fly ashes in replacement levels from 0% to 100% do not affect significantively on the mechanical caracteristics of the mortars considered in the present study which had an addition maximum content of 35%.
