scholarly journals Influence of Silica Based Waste Materials on the Mechanical And Physical Properties of Mortar

2015 ◽  
Vol 6 (1) ◽  
pp. 1-5
Author(s):  
S.I. Balang ◽  
N. Mohamed Sutan ◽  
I. Yakub ◽  
M.S. Jaafar ◽  
K.A. Matori
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
High Performance ◽  
High Performance Concrete ◽  
Physical And Mechanical Properties ◽  
Waste Materials ◽  
Hydration Time ◽  
Microstructural Investigation ◽  
Pozzolanic Material ◽  
Mechanical And Physical Properties

 This is an investigation on the influence of silica based waste materials namely silica fume (SF) and recycled vase (RV) on the physical and mechanical properties of mortar. Results showed that 15%SF modified mortar achieved the highest strength and lowest water absorption capability compared to Control mortar and other mixtures. The result was confirmed by water absorption capability test for the same mixtures where 15% SF modified mortar was found to absorb the least. Furthermore, combination of 15% SF and 10% RV achieved the lowest water absorption compared to other combinations samples but higher than Control and 15% SF modified mortar. The results of this study indicated that SF is highly pozzolanic material that can be an excellent cement replacement material to produce high-performance concrete. Study on pozzolanc behavior of SF samples subjected to longer hydration time is needed. Further microstructural investigation is needed to confirm the hypothesis on retardation of hydration due to unreactive RV.

Physical and Mechanical Properties of High Performance Concrete with Alum Sludge as Partial Cement Replacement

2013 ◽  
Vol 65 (2) ◽  
Author(s):  
Haider Mohammed Owaid ◽  
Roszilah Hamid ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Noorhisham Tan Kofli ◽  
Mohd Raihan Taha
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Physical And Mechanical Properties ◽  
Cement Replacement ◽  
Alum Sludge ◽  
Partial Cement Replacement

Temperature Effect on the Mechanical Properties of Very High Performance Concrete

2018 ◽  
Vol 34 ◽  
pp. 29-39
Author(s):  
Mebarek Belaoura ◽  
Dalila Chiheb ◽  
Mohamed Nadjib Oudjit ◽  
Abderrahim Bali
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Exothermic Reaction ◽  
Physical And Mechanical Properties ◽  
Mass Effect ◽  
Mechanical Tests ◽  
Conventional Concrete ◽  
Very High

This study aims at a better understanding of the behaviour of very high performance concretes (VHPC) subjected to high temperatures. The temperature increase within the concrete originating from the hydratation exothermic reaction of cement is emphasized by the mass effect of the structures and can lead to thermal variations of around 50°C between the heart and the structures walls. These thermal considerations are not without consequence on durability and the physical and mechanical properties of very high performance concrete, such as the compressive strength. This work is an experimental research that shows the effects of temperature on the mechanical properties of very high performance concrete (VHPC) and compares them with those of conventional concrete and HPC. Test specimens in usual concrete, HPC and VHPC are made, preserved till maturity of the concrete, and then subjected to a heating-cooling cycle from room temperature to 500°C at heating rate 0.1°C/min. Mechanical tests on the hot concrete and cooling (air and water) were realized. The results show that the mechanical characteristics of VHPC (density, compressive strength, tensile strength and elastic modulus) decrease with increasing temperature, but their strength remains higher than that of conventional concrete.

High Performance Concrete with SCM and Recycled Aggregate

2016 ◽  
Vol 677 ◽  
pp. 233-240 ◽  
Author(s):  
Wojciech Kubissa ◽  
Roman Jaskulski ◽  
Artur Koper ◽  
Marcin Supera
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Waste Materials ◽  
Concrete Aggregate ◽  
Reinforced Concrete Structures ◽  
Recycled Concrete Aggregate ◽  
Class F Fly Ash

In the article the possibility of utilization of two waste materials: Recycled Concrete Aggregate (RCA) fraction 4-16 mm and Class F fly ash (from coal burning power plant) in high perfor-mance concrete (HPC) was presented. Concrete with RCA were made with varying amount of cement and Suplementary Cementing Materials (SCM). The specimens of concrete were tested to compare mechanical properties as well as some properties related to the durability of concrete. Compression strength values up to 71.40 MPa were achieved and good values of properties determinig durability of reinforced concrete structures.

Experimental Research of High Performance Concrete with Multi-Elements Mineral Admixtures

2009 ◽  
Vol 405-406 ◽  
pp. 24-29 ◽  
Author(s):  
Ke Liang Li ◽  
Xiu Sheng Tang ◽  
Guo Hong Huang ◽  
Hui Xu
Keyword(s):  
Mechanical Properties ◽  
Diffusion Coefficient ◽  
High Performance ◽  
High Performance Concrete ◽  
Physical And Mechanical Properties ◽  
Chloride Ion ◽  
Gas Diffusion ◽  
Mineral Admixtures ◽  
Alkali Silica Reaction ◽  
Superposition Effect

Performing the superposition effect of multi-elements mineral admixtures, high performance concrete (HPC) with 3% of silicon fume, 20% of fly ash and 40% of ground granulated blast-furnace slag (GGBS) was prepared, and its physical and mechanical properties and durability were studied systematically. The compressive strength and tensile strength of HPC are better than those of ordinary concrete. HPC has high compactness with smaller gas diffusion coefficient and relative permeability coefficient. Adding volume stabilizer and controlling the contents of SO3 in the GGBS and volume stabilizer at 3%, can reduce dry shrinkages effectively. Large mount of mineral admixture was used to make the concentrations of K+ and Na+ in the pore solution and the expansion caused by alkali-silica reaction depress greatly. So the alkali-silica reaction gets controlled markedly. The effective diffusion coefficient of chloride ion is 1.96×10-12 m2/s, which means HPC has a favorable chloride ion penetration resistance. After 15 times of wet-dry cycle, the rates of the rust area and quality loss of the reinforcing steel bars in HPC are only 4.1% and 0.05% respectively, so HPC has better performance of steel protection. The mortar bar did not expand in corrosive sodium sulfate solution, and it means HPC has better performance of sulfate resistance. The performances of frost resistance and carbonation resistance of HPC are also favorable. It’s proved in tests that the superposition effect of multi-elements mineral admixtures can enhance the physical and mechanical properties and durability of concrete greatly.

Analysis on the Correlations between Preservatives and the Durability of High Performance Structural Concretes

2011 ◽  
Vol 374-377 ◽  
pp. 1380-1384
Author(s):  
Qi Feng Cheng ◽  
Bao Lian Wen ◽  
Mei Dan Li ◽  
Wen Ling Tian ◽  
Chun Yang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Building Material ◽  
High Performance ◽  
High Performance Concrete ◽  
Long Time ◽  
Durability Of Concrete

Concrete is the most consumed building material worldwide today, which durability has been paid close attentions for a long time. Currently，the design lifetime of many buildings is over 100 years. At present, many projects adopt preservatives to extend the durability of concrete. the paper makes contrastive studies on mechanical properties, ASTM flux, RCM chloridion diffusion, Permit in situ chloridion permeability, Autoclam water absorption, and freezing & thawing resistance between preservatives-added and non-preservative concretes at different typical strengths; and concludes correlations between the preservatives at different strengths and the durability of concrete, thus to evaluate the influence of various preservatives on the durability of high-performance concrete.

scholarly journals Influence of Nanoparticles from Waste Materials on Mechanical Properties, Durability and Microstructure of UHPC

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4530 ◽  
Author(s):  
Sahar A. Mostafa ◽  
Ahmed S. Faried ◽  
Ahmed A. Farghali ◽  
Mohamed M. EL-Deeb ◽  
Taher A. Tawfik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rice Husk ◽  
High Performance ◽  
Rice Husk Ash ◽  
High Performance Concrete ◽  
Waste Materials ◽  
Nano Silica ◽  
Ultra High Performance Concrete ◽  
X Ray

This investigation presents the influence of various types of nanoparticles on the performance of ultra high performance concrete (UHPC). Three nanoparticles from waste materials include nano-crushed glass, nano-metakaolin, nano-rice husk ash were prepared using the milling technique. In addition, nano-silica prepared using chemical method at the laboratory is implemented to compare the performance. Several UHPC mixes incorporating different dosages of nanoparticles up to 5% are prepared and tested. Mechanical properties, durability as well as the microstructure of UHPC mixes have been evaluated in order to study the influence of nanoparticles on the hardened characteristics of UHPC. The experimental results showed that early strength is increased by the incorporation of nanomaterials, as compared to the reference UHPC mix. The incorporation of 3% nano-rice husk ash produced the highest compressive strength at 91 day. Microstructural measurements using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDX), and Thermogravimetric Analysis (TGA) confirm the role of nanomaterials in densifying the microstructure, reducing calcium hydroxide content as well as producing more C-S-H, which improves the strength and reduces the absorption of UHPC. Nanoparticles prepared from waste materials by the milling technique are comparable to chemically prepared nanosilica in improving mechanical properties, refining the microstructure and reducing the absorption of UHPC.

Mechanical properties and durability of high - performance concrete for bridge decks

PCI Journal ◽  
2008 ◽  
Vol 53 (4) ◽  
pp. 108-130
Author(s):  
Mohsen A. Issa ◽  
Atef A. Khalil ◽  
Shahidul Islam ◽  
Paul D. Krauss
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Sign in / Sign up

Export Citation Format

Share Document