Thermal conductivity and compressive strength of concrete incorporation with mineral admixtures

2007 ◽  
Vol 42 (7) ◽  
pp. 2467-2471 ◽  
Author(s):  
Ramazan Demirboğa
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Mineral Admixtures ◽  
Compressive Strength Of Concrete

scholarly journals Influence of boulder machine-made sand powder on compressive strength of concrete

2021 ◽  
Vol 293 ◽  
pp. 02023
Author(s):  
Pengtao Wang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Early Stage ◽  
Cementitious Materials ◽  
Mineral Admixtures ◽  
Rock Powder ◽  
Manufactured Sand ◽  
Slag Powder ◽  
Compressive Strength Of Concrete ◽  
Curing Age

In order to recycle the boulder powder produced in the process of manufactured sand production and reduce the cost of engineering concrete, this article studied the influence of boulders powder on the compressive strength of concrete. The results show that in the early stage of concrete test, the compressive strength of rock powder concrete is slightly lower than of fly ash and mineral powder concrete. With the development of curing age, the strength of boulders powder concrete developed slower. As the increase of boulders powder content, the compressive strength of different curing age gradually decreased, and it was suggested that the content of boulders powder should be controlled within 20% of cementitious materials mass. The positive effect of boulders powder fineness on the strength of concrete is limited, so it is suggested to use unprocessed collected boulders powder in the project, which is economical and environmentally friendly. With the adjustment of water-to-binder ratio, boulders powder can be prepared with different strength grades of concrete to meet the needs of engineering; the composite of boulders powder with traditional mineral admixtures, such as fly ash, and especially granulated blast furnace slag powder, can significantly improve the strength of concrete.

scholarly journals Research on the influence of boulder powder content on concrete performance

2021 ◽  
Vol 293 ◽  
pp. 02009
Author(s):  
Guangcheng Meng
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Mineral Admixtures ◽  
Cement Concrete ◽  
Satisfactory Performance ◽  
Compressive Strength Of Concrete ◽  
Electric Flux ◽  
Granite Powder ◽  
Powder Content

To solve the problem of environmental pollution caused by the accumulation of granite powder and the shortage of traditional mineral admixtures, the influence of the amount of granite powder on the mechanical properties of concrete was studied by replacing cement with different amount of granite powder Different amount of granite powder can be used to prepare concrete with satisfactory performance. When the amount of granite powder is small (not more than 5%), granite powder will not reduce the compressive strength of concrete, or even slightly improve the compressive strength of pure cement concrete. When the amount of granite powder is more than 5%, the compressive strength of concrete will gradually decrease; when the amount of granite powder is more than 5%, the compressive strength of concrete will gradually decrease. The elastic modulus of concrete decreased, and the electric flux increased with the increase of the amount of admixture.

scholarly journals Identifying the Reference Time for Determining the Compressive Strength of Concrete Containing Different Types of Cements

2019 ◽  
Vol 15 (1) ◽  
pp. 26-35
Author(s):  
Anca Ionescu ◽  
Adelina Apostu ◽  
Dan Paul Georgescu
Keyword(s):  
Compressive Strength ◽  
Concrete Strength ◽  
Subsequent Treatment ◽  
Mineral Admixtures ◽  
Strength Increase ◽  
Reference Time ◽  
Significant Strength ◽  
Different Types ◽  
Compressive Strength Of Concrete ◽  
Composite Cements

Abstract The compressive strength of the concrete measured at 28 days is the criterion for assessing the concrete class, and these values will be acceptable precise indications for other physical and mechanical characteristics of the concrete. In addition to the factors the compressive strength of concrete varies on (such as: the characteristics and proportion of constituents, the placement conditions and subsequent treatment and testing conditions), the concrete class should also depend on the type of cement contained and the concrete strength evolution over time. Due to the fact that concretes with composite cements have a slower evolution of compressive strength and a significant strength increase after 28 days, concretes with different types of cements and mineral admixtures were tested for compression after 28 days in order to determine the reference time for such tests – and thus the concrete’s class.

The Effects of Mineral Admixture on the Compressive Strength of Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 263-266
Author(s):  
Mei Li Zhao
Keyword(s):  
Compressive Strength ◽  
Industrial Waste ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Optimum Dosage ◽  
Natural Minerals ◽  
Compressive Strength Of Concrete

Mineral admixture was one or more industrial waste, or mixed with finely ground natural minerals, or grinded mixture.By replacing part of the cement with mineral admixtures , cement could be saved and improved the performance of concrete. In this paper，the compressive strength and slump of the concrete with mineral admixture were tested. The amount of cement replaced by mineral admixture in the concrete affected the compressive strength and the slump. According to the compressive strength and slump of the concrete, the optimum dosage of the mineral admixture was from 30% to 40%.

Mechanical, thermal and chemical properties of spent black tea doped concrete

2020 ◽  
Vol 62 (10) ◽  
pp. 1055-1058
Author(s):  
Hakan Kaygusuz ◽  
Serap Hanbay
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Chemical Properties ◽  
Black Tea ◽  
High Volume ◽  
Strength Properties ◽  
Concrete Mixtures ◽  
Tea Waste ◽  
Compressive Strength Of Concrete ◽  
And Chemical Properties

Abstract The use of waste materials in concrete has been accelerated around the world recently. In this study, thermal and compressive strength properties of concrete doped with black tea waste are studied to assess the availability of using this type of waste in concrete. Black tea waste with 0.3 and 0.5 vol.-% were added to concrete mixtures. Thermal conductivity and effusivity of concrete with black tea waste were evaluated firstly, and load-bearing capacity of this biomass doped concrete were also investigated by the compressive test and Schmidt hammer test. The results showed that using black tea waste with 0.3 vol.-% slightly decreased the compressive strength of concrete whereas there was a considerable decrease in thermal conductivity. However, using black tea waste with 0.5 vol.-% causes an obvious decrease in compressive strength and a decrease in thermal conductivity of concrete which is not directly proportional with the amount of black tea. Therefore, with a small toleration of loss of compressive strength, black tea waste doped concrete can be produced with high volume fractions in order to have concrete samples with good thermal insulation for research purposes.

Mechanical Properties of Concrete with Compound Mineral Admixtures

2013 ◽  
Vol 325-326 ◽  
pp. 55-58
Author(s):  
Yun Feng Li ◽  
Zhi Feng Xu ◽  
Ling Ling Wang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Blast Furnace Slag ◽  
Steel Slag ◽  
The Other ◽  
Mineral Admixtures ◽  
Mixture Ratio ◽  
Compressive Strength Of Concrete ◽  
Optimal Mixture Ratio ◽  
Furnace Slag

The influence of multi-component composite mineral admixtures on the mechanical properties and workability of concrete is studied in this paper, such as steel slag (SS), blast furnace slag (BFS) and fly ash (FA). Considering the above-mentioned factors, the optimal mixture ratio and substituted amount of composite mineral admixtures replacing equally cement are obtained. The results showed that composite mineral admixtures reduced the early compressive strength of concrete with composite admixtures, but significantly improved the workability and later compressive strength of concrete with composite admixtures. On the other hand, the optimal mixture ratio and substituted amount of double-mixing mineral admixtures are different.

The influence of the addition of ground olive stone on the thermo-mechanical behavior of compressed earth blocks

2020 ◽  
Vol 108 (2) ◽  
pp. 203
Author(s):  
Samia Djadouf ◽  
Nasser Chelouah ◽  
Abdelkader Tahakourt
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Mechanical Behavior ◽  
Agricultural Waste ◽  
Hydraulic Press ◽  
Dry Density ◽  
Olive Stone ◽  
Compressed Earth Blocks ◽  
Clay Matrix ◽  
Earth Blocks

Sustainable development and environmental challenges incite to valorize local materials such as agricultural waste. In this context, a new ecological compressed earth blocks (CEBS) with addition of ground olive stone (GOS) was proposed. The GOS is added as partial clay replacement in different proportions. The main objective of this paper is to study the effect of GOS levels on the thermal properties and mechanical behavior of CEB. We proceeded to determining the optimal water content and equivalent wet density by compaction using a hydraulic press, at a pressure of 10 MPa. The maximum compressive strength is reached at 15% of the GOS. This percentage increases the mechanical properties by 19.66%, and decreases the thermal conductivity by 37.63%. These results are due to the optimal water responsible for the consolidation and compactness of the clay matrix. The substitution up to 30% of GOS shows a decrease of compressive strength and thermal conductivity by about 38.38% and 50.64% respectively. The decrease in dry density and thermal conductivity is related to the content of GOS, which is composed of organic and porous fibers. The GOS seems promising for improving the thermo-mechanical characteristics of CEB and which can also be used as reinforcement in CEBS.

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