scholarly journals Study Using Different Fibres in Fibre Reinforced Concrete

2021 ◽  
Vol 9 (11) ◽  
pp. 484-493
Author(s):  
Tushant Gupta
Keyword(s):  
Construction Industry ◽  
Building Materials ◽  
Concrete Structures ◽  
High Strength ◽  
Natural Polymers ◽  
Plastic Properties ◽  
Steel Bars ◽  
Reinforced Steel ◽  
Over Time

Abstract: The most widely used man-made materials in the construction industry are concrete. It is a combination of cemeteries, water, compounds and various types of admixtures to a certain extent. New concrete has plastic properties, which means that before casting it it behaves like plastic but over time, it becomes harder as rock. These hardening structures occur due to the chemical reaction between water and cement, it hardens over a long period of time. From the last century onward, the strength of the RCC structures was largely based on the round steel bars, which were readily available in the market. Over time, these items have also changed in appearance, structure, and power. For example, Pozzolana cement is used in place of conventional cement and TMT bars are applied in place of stainless steel. Energy testing methods are based on Indian standards. Test equipment provides complete results after examination of cubes, cylinders and beams, which are inserted and stored in water for treatment for 28 days continuously. Concrete structures, either in the 1970s or later made of high-strength steel-reinforced steel, have replaced concrete structures and structures with various additives in cement and admixtures with their acceleration or deceleration capacity. Now, instead of steel bars, steel fibers, polypropylene, natural polymers etc. are used. The reasons for the demands are many, but as a building engineer, we have to think hard and architecture by using building materials. In anticipation of long-term sustainability, we need to be able to meet needs.

scholarly journals KAJIAN KARBONASI PADA BETON MUTU TINGGI MEMADAT MANDIRI DENGAN VARIASI KOMPOSISI METAKAOLIN

2020 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Wibowo Wibowo ◽  
Endah Safitri ◽  
Delista Putri Deni
Keyword(s):  
Construction Industry ◽  
Cement Content ◽  
High Strength ◽  
Experimental Methods ◽  
Self Compacting Concrete ◽  
Carbonation Depth ◽  
Concrete Quality ◽  
Reinforced Steel ◽  
Strength And Durability ◽  
Durability Of Concrete

<p class="Abstract"><em>The construction industry is an important thing to support the development of a country. In concrete construction, quality, strength, and durability of concrete are the main requirements of all. In urban tropical countries, carbonation is one of the essential factors that affect the durability of concrete, and it may cause corrosion of reinforced steel in concrete. Therefore, high strength self-compacting concrete may be expected as the solution, improved by pozzolanic additions, metakaolin with substitution dosage at 10%; 12,5%; 15%; 17,5%; and 20%. This study purposed to determine the effect of metakaolin and its optimum dosage to improve high strength self-compacting concrete quality on its carbonation rates. This study was done by using experimental methods. It needs a plain cylindrical concrete with 75 mm diameter and 150 mm height, and testing by SNI 03-6468-2000, EFNARC 2002, and SEM-PUPR 25-2015. The carbonation test is done using accelerated laboratory carbonation </em><em>in Structures and Materials Laboratory, Faculty of Engineering, Universitas Sebelas Maret </em><em>by soaking the specimens in a 4% carbonate solution for 15 days, 37 days, and 51 days, proceeded by splitting using CTM, and spray it using a 1% phenolphthalein indicator to determine its carbonation depth. Based on the results, metakaolin might improve concrete quality by reducing its carbonation rates by 15% substitution dosage of cement content, with a nominal atmospheric carbonation coefficient 3,71 mm/year<sup>½</sup>, reduced 44,41% from HSSCC without metakaolin substitution. Metakaolin addition might reduce fresh concrete's workability and fulfill self-compacting concrete requirements specified by EFNARC 2002.</em></p>

scholarly journals Intellectual Capital Change Management in the Construction Industry—The Case of an Inter-Organisational Collaboration

2021 ◽  
Vol 7 (3) ◽  
pp. 199
Author(s):  
José Vale ◽  
Nádia Barbosa ◽  
Rui Bertuzi ◽  
Ana Maria Bandeira ◽  
Vera Teixeira Vale
Keyword(s):  
Construction Industry ◽  
Intellectual Capital ◽  
Competitive Advantages ◽  
Traditional Media ◽  
Intellectual Assets ◽  
Changes Over Time ◽  
The Impact ◽  
Over Time

Nowadays, due to the complexity of the relationships with external entities, along with the importance that traditional media and the innovative social media have in creating competitive advantages, it is necessary for companies to collaborate in order to create Intellectual Capital (IC). Although collaboration is crucial to create IC, there is a paucity in literature regarding the effects that a specific type of collaboration may have on the IC of an organisation, specifically a franchising with a mediatic actor. Moreover, literature addressing IC creation and destruction over time is scarce, especially when applied to the construction industry. This paper’s goal is twofold: understanding the longitudinal changes of a construction SME’s Intellectual Capital, regarding its creation and destruction; analysing the impact that a specific inter-organisational collaboration franchising—with a mediatic actor may have on such IC. A single in-depth case study was conducted, allowing to conclude that the actions of an organisation can develop both Intellectual Assets and Intellectual Liabilities. It was also concluded that inter-organisational collaboration, through a franchise with an actor with experience in communication, can generate, in the long term, positive and innovative effects regarding the different IC components, namely the Relational one. More specifically, the paper allowed to ascertain that an organisation’s IC changes over time in a dynamic fashion, i.e., Intellectual Liabilities which emerged before an innovative collaboration can be transformed into Intellectual Assets and create competitive advantages. This paper contributes to stress the importance of managing IC, not only when it is created, but namely in when it can be destroyed, in a context of inter-organisational collaborations applied to a construction SME.

scholarly journals Hydrothermally treated cement-based building materials. Past, present, and future

2002 ◽  
Vol 74 (11) ◽  
pp. 2131-2135 ◽  
Author(s):  
A. Ray
Keyword(s):  
Building Materials ◽  
Analytical Techniques ◽  
Drying Shrinkage ◽  
High Strength ◽  
Thermal Methods ◽  
Building Products ◽  
Blended Cements ◽  
Phase Development ◽  
Wide Range

Hydrothermally cured or autoclaved cement-based building products have provided many challenges to researchers, manufacturers, and users since their inception nearly 100 years ago. The advantages, including the development of high strength within a few hours and a reduction of drying shrinkage, of the hydrothermal curing process have resulted in a variety of building products; inevitably, the technology of their production has undergone many stages of refinement. With the advent of nonconventional starting materials for the production of modern cements, and the push to utilize renewable resources to form blended cements, the chemical and physical make-up of hydrothermally cured building materials have changed considerably in recent years and will continue to change. It is, therefore, important to understand the chemical reactions taking place in an autoclave, and the consequent phase developments, if building materials produced by this process continue to be successful in the long term. A wide range of analytical techniques exists for characterizing the phase development in cement-based materials. The purpose of this paper is to illustrate the strength of thermal methods, especially when used in combination with other analytical techniques, in the understanding of hydrothermal reactions.

scholarly journals Strength Calculation Features and Tests Results on Bearing Capacity and Operational Serviceability of Hollow-Core Floor Slabs of Formwork-Free Shaping in Seismic Areas

2020 ◽  
Vol 9 (1) ◽  
pp. 2219-2225
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Construction Industry ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Concrete Structures ◽  
High Strength ◽  
Reinforced Concrete Structures ◽  
Hollow Core ◽  
Wide Range

The technology of manufacturing reinforced concrete structures of long-line systems of formwork-free shaping is widely used lately in construction industry in many countries. Using this technology, industrial construction can be carried out in accordance with the requirements of modern regulatory documents that allow projects to be developed individually, and production can be reoriented in a very short time in accordance with emerging needs. This means that on the same production line it is possible to produce various structural elements of buildings and structures. Also, this technology allows the production of structures according to a wide range of products that meet operational requirements, and increases the possibility of their use in design of buildings and structures with various architectural, planning and structural decisions. Prestressed hollow-core slabs of formwork-free shaping reinforced with high-strength wire reinforcement are widely used due to the simplicity of construction and their relatively low cost, as well as their high bearing capacity, large spans and better quality. The problem of their introduction into construction industry of Uzbekistan is that the issues of designing, manufacturing and using them in construction have not been studied. Besides, the production technology of such slabs is mostly associated with the construction in non-seismic areas, and the country does not have an appropriate regulatory framework for the possibility of slab designing and production. The aim of the study is to assess the strength and serviceability of hollow-core slabs of formwork-free shaping, designed on the basis of the proposed structural solution of the slab cross section and intended for construction in seismic areas. Therefor the issues of optimizing the main reinforcement consumption (prestressed high-strength wire reinforcement) at class B30 concrete strength without using the non-stressed reinforcement (reinforcing products) for the product range under consideration were addressed. Theoretical and constructive solutions of the slabs were developed in accordance with the standard requirements of Uzbekistan KMK 2.03.01-96 “Concrete and reinforced concrete structures”, KMK 2.01.03 “Construction in seismic areas” and considering the Euronorm EN 1168-2005 requirements “Precast concrete. Hollow-core slabs”.

scholarly journals Prepared experimental study for durability verification of FRP reinforced concrete members

2021 ◽  
Vol 1209 (1) ◽  
pp. 012055
Author(s):  
S Blaho ◽  
K Gajdošová
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Structures ◽  
High Strength ◽  
Bending Test ◽  
Reinforced Concrete Structures ◽  
Reinforced Polymers ◽  
Concrete Members ◽  
Four Point Bending

Abstract Major advantage of fibre reinforced polymers (FRPs) is their high strength and low weight to strength ratio. These are also the main reasons for a choice for this material in the process of design of reinforced concrete structures. Since there is no corrosion of FRP, this reinforcement could be strongly recommended for concrete reinforcement in aggressive environment. Till today there is no sufficient knowledge of long-term behaviour of FRP-reinforced concrete structures. Design codes give low utilization capacity of FRP materials and are not supposed to be correct according to the real behaviour in a few experiments of last decades. Reduction factors limit the mechanical properties in the range from 0.95 for CFRP to 0.5 for GFRP. In the paper there is presented a prepared and today realized long-term experimental study based on four point bending test on simply supported concrete beams reinforced with GFRP reinforcement.

The Use of High Performance Textiles in Construction Projects

2002 ◽  
Vol 31 (3) ◽  
pp. 205-217 ◽  
Author(s):  
Fred Isley
Keyword(s):  
Construction Industry ◽  
Textile Industry ◽  
Construction Projects ◽  
High Performance ◽  
Building Materials ◽  
Glass Fibers ◽  
High Strength ◽  
The Past ◽  
Textile Fabrics ◽  
Construction Trades

A niche in the textile industry provides high strength, high modulus textile fabrics to the construction industry as a potential replacement for more traditional building materials such as wood, concrete, masonry, and steel. The mechanical properties of fabrics made of aramid, carbon and glass fibers lend themselves to the needs of the design engineer by providing high strength to weight, high stiffness to weight and extreme flexibility in use and design. Combined with cross-linking resins systems to form a composite, the fabrics are being widely accepted by the civil engineers serving the construction trades Thousands of structures around the world have been repaired, retrofitted or built of such fabrics in the past 10 years.

The General Properties and Applications of Ceramic Materials

2012 ◽  
Vol 174-177 ◽  
pp. 215-218
Author(s):  
Peng Wang
Keyword(s):  
Silicon Carbide ◽  
Construction Industry ◽  
Building Materials ◽  
High Strength ◽  
Modern Society ◽  
Ceramic Materials ◽  
Metallic Materials ◽  
High Melting ◽  
Melting Points ◽  
Traditional Ceramics

There are two groups of ceramics, traditional and modern ones. Brick, cement tile, and glass are traditional ceramics. They are inorganic non-metallic materials with high melting points, high strength, good strength, and excellent oxidation resistance. Construction industry mainly depends on them. However, traditional ceramics are brittle, low strength, low resistance. Compared with traditional ones, modern ceramics are magnitude finer, more homogeneous, and less porous. They include alumina, silicon nitride, silicon carbide, and boron carbide. They can be applied to building materials, components, and aerospace. Therefore, modern ceramics have stronger adaptability to modern society. Ceramic engineers need in-depth research on design and application modern ceramics.

Carbon Footprint Inventory, Estimation and Analysis System in a RC Building Materials

2012 ◽  
Vol 496 ◽  
pp. 150-153
Author(s):  
Li Teh Lu ◽  
I Cheng Chang
Keyword(s):  
Life Cycle ◽  
Construction Industry ◽  
Carbon Emission ◽  
Building Materials ◽  
Preliminary Investigation ◽  
High Carbon ◽  
Carbon Footprints ◽  
Steel Bars ◽  
Rc Building ◽  
Analysis System

The construction industry is one part of economic development critical to a nation’s infrastructure. However, there is significant man-made “Greenhouse Gas (GHG)” generated during the construction industry’s any Life Cycle (LC).We tailor actions to suit local circumstance and made a systematically preliminary investigation of an inventory, estimation and analysis system currently available in estimation of carbon footprints of an ordinary RC building in Taiwan. There are about 60% of carbon footprints derived from production or usage of high carbon emission building material steel bars.

scholarly journals Service Life Prediction of Concrete Structure Using Life-365 Software

2021 ◽  
Vol 12 (2) ◽  
pp. 1816-1826
Author(s):  
A. Deiveegan, Et. al.
Keyword(s):  
Service Life ◽  
Concrete Structure ◽  
Concrete Structures ◽  
High Strength ◽  
Vital Role ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Global Concern ◽  
Peak Value

The performances of repaired concrete structures continue to be a major global concern. This is the improvement in repairing materials and method, several repaired concrete structures still fail, leading to costly and time-consuming. This study was conducted to assess the effect of long-term chloride penetration as well as the effect of fly ash, water-cement ratio, and inhibitor on concrete structures to predict its Service life to obtained high strength durable concrete. The water-cement ratio played a vital role, as the water-cement ratio is reducing to get more service life of the concrete and at the value of 0.5, it seems that the peak value of service life of the concrete structure. In this paper, it is generally finding the service life of a concrete structure by reviewing the previous researches and by using Software Life-365.

Sign in / Sign up

Export Citation Format

Share Document