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

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.

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Effect of Porosity on Mechanical and Hygric Properties of Concrete with Natural Pozzolan Addition

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.982.22 ◽

2014 ◽

Vol 982 ◽

pp. 22-26 ◽

Cited By ~ 1

Author(s):

Tereza Kulovaná ◽

Pavla Rovnaníková ◽

Zbyšek Pavlík ◽

Robert Černý

Keyword(s):

Compressive Strength ◽

Portland Cement ◽

Moisture Transport ◽

High Performance ◽

High Performance Concrete ◽

Moisture Diffusivity ◽

Natural Pozzolan ◽

Cement Replacement ◽

Hygric Properties ◽

Partial Cement Replacement

Effect of porosity on mechanical and hygric properties of high performance concrete (HPC) with natural pozzolan as partial Portland cement replacement up to 40% is studied in the paper. The reference HPC mixture is researched as well in order to evaluate the influence of pozzolan usage on concrete performance. For the studied materials, measurement of compressive strength, sorptivity, apparent moisture diffusivity, and water vapor diffusion permeability is done. The obtained data shows that application of the pozzolan as partial cement replacement leads to increase of concrete porosity that is related to the lower mechanical strength and higher moisture transport properties. Therefore, the applied natural pozzolan has a potential to replace a part of Portland cement in concrete manufacturing but its content in concrete mixture has strict limitations.

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The influence of aggregate type on the physical and mechanical properties of high-performance concrete subjected to high temperature

Fire and Materials ◽

10.1002/fam.2318 ◽

2015 ◽

Vol 40 (5) ◽

pp. 668-682 ◽

Cited By ~ 20

Author(s):

Izabela Hager ◽

Tomasz Tracz ◽

Jacek Śliwiński ◽

Katarzyna Krzemień

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

High Performance ◽

High Performance Concrete ◽

Physical And Mechanical Properties

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An Application of Blended Palm Oil Waste in Brick Production

Indonesian Journal of Computing, Engineering and Design (IJoCED) ◽

10.35806/ijoced.v3i2.175 ◽

2021 ◽

pp. 97-105

Author(s):

Euniza Jusli ◽

Jen Ling ◽

Mastura Bujang ◽

Dayang Ali ◽

Toh Lee

Keyword(s):

Mechanical Properties ◽

Palm Oil ◽

Industrial Waste ◽

Carbon Dioxide Emission ◽

Physical And Mechanical Properties ◽

Cement Industry ◽

Major Contributor ◽

Cement Replacement ◽

Negative Impacts ◽

Partial Cement Replacement

Cement brick is an essential construction component, which uses cement as the primary binder. The cement industry was identified as the major contributor to carbon dioxide emission, which is a greenhouse gas. The application of agro-industrial waste as partial cement replacement can reduce the negative impacts on the environment. In this study, the palm oil wastes, namely Palm Oil Clinker Powder (POCP) and Palm Oil Boiler Ash (POBA), were used as partial cement replacement. A total of 60 specimens were prepared with 0%, 10%, 20%, and 30% cement replacement by POCP and POBA. The physical and mechanical properties of bricks, such as density, water absorption, voids, and compressive strength, were investigated. The results show that the brick with 20% CP and BA could be used as a severe weathering brick.

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

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.405-406.24 ◽

2009 ◽

Vol 405-406 ◽

pp. 24-29 ◽

Cited By ~ 1

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.

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

Journal of Civil Engineering Science and Technology ◽

10.33736/jcest.142.2015 ◽

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.

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