scholarly journals The Synergic Effects of Mineral Admixtures in Ternary Blended Cement: A Review

2021 ◽  
Vol 27 (2) ◽  
pp. 83-105
Author(s):  
Shubbar Jawad Al-obaidey
Keyword(s):  
Blended Cement ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Fresh Properties ◽  
Cement Concrete ◽  
Cement Production ◽  
Sustainable Concrete ◽  
Concrete Properties ◽  
Different Types ◽  
Efficiency Factors

In the last decades, using mineral admixture in concrete became very necessary to improve concrete properties and reduce CO2 emissions associated with the cement production process. Subsequently, more sustainable concrete can be obtained.  Ternary blended cement containing two different types of mineral admixture can achieve ambitious steps in this trend. In this research, the synergic effects of mineral admixtures in ternary blended cement and its effects on concrete fresh properties, strength, durability, and efficiency factors of mineral admixture in ternary blended cement, were reviewed. The main conclusion reached after reviewing many literature pieces is that the concrete with ternary blended cement, depending on types of mineral admixtures used, replacement percentages by weight of cement, and age of concrete, exhibited superior properties than with no mineral admixtures and corresponding binary blended cement concrete.

Evaluation of Fresh Properties and Rheology of Mortar Using Carbon-Free Fly Ash and Normal Fly Ash

2020 ◽  
Vol 1005 ◽  
pp. 76-81
Author(s):  
Ghawsaddin Nazari ◽  
Shunya Yamanaka ◽  
Shigeyuki Date
Keyword(s):  
Fly Ash ◽  
Setting Time ◽  
Great Influence ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Fresh Properties ◽  
Initial Setting Time ◽  
Usual Solution ◽  
Initial Setting ◽  
Flow Loss

Usage of mineral admixture and chemical admixture in concrete or mortar is a usual solution to reach full compaction, particularly where reinforcement blockage and lack of skilled labor happen. In this paper effect of mineral admixtures (Carbon-free fly ash, hereafter CfFA, and normal fly ash) on fresh properties and rheology of mortar have been investigated. As a result, it was confirmed that CfFA increased significantly the fluidity and air content of mortar in comparison to normal fly ash, both in 15% and 30% replacement; however, the flow loss and air stability within one hour were almost equal. In addition, the initial setting time has also been affected by variation of materials. The two mixing of 30% and 15% of CfFA had a shorter setting time in comparison to the mortar with normal fly ash. Furthermore, CfFA based mortar had a great influence on rheology of mortar. Compared to normal fly ash, CfFA Considerably decreased the plastic Viscosity and increased the productivity of the mortar, both in non-vibrated and vibrated condition, particularly those with 30% replacement.

scholarly journals Diffusion Decay Coefficient for Chloride Ions of Concrete Containing Mineral Admixtures

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Jae-Im Park ◽  
Kwang-Myong Lee ◽  
Soon-Oh Kwon ◽  
Su-Ho Bae ◽  
Sang-Hwa Jung ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Concrete Structures ◽  
Blended Cement ◽  
Chloride Ions ◽  
Mineral Admixture ◽  
Curing Temperature ◽  
Mineral Admixtures ◽  
Exposure Condition ◽  
Diffusion Decay ◽  
Decay Coefficient

The diffusion coefficient for chloride ions and the diffusion decay coefficient for chloride ions are essential variables for a service life evaluation of concrete structures. They are influenced by water-binder ratio, exposure condition, curing temperature, cement type, and the type and use of mineral admixture. Mineral admixtures such as ground granulated blast furnace slag, fly ash, and silica fume have been increasingly used to improve resistance against chloride ions penetration in concrete structures built in an offshore environment. However, there is not enough measured data to identify the statistical properties of diffusion decay coefficient for chloride ions in concrete using mineral admixtures. This paper is aimed at evaluating the diffusion decay coefficient for chloride ions of concrete using ordinary Portland cement or blended cement. NT BUILD 492 method, an electrophoresis experiment, was used to measure the diffusion coefficient for chloride ions with ages. It was revealed from the test results that the diffusion decay coefficient for chloride ions was significantly influenced by W/B and the replacement ratio of mineral admixtures.

Methodological Approaches to 3D Pore Structure Exploration in Cementitious Materials

2012 ◽  
Vol 517 ◽  
pp. 305-314 ◽  
Author(s):  
Piet Stroeven ◽  
L.B Nghi Le ◽  
Huan He
Keyword(s):  
Image Analysis ◽  
Pore Structure ◽  
Blended Cement ◽  
Cementitious Materials ◽  
Quantitative Image Analysis ◽  
Mineral Admixture ◽  
Strength Development ◽  
Cement Production ◽  
Quantitative Image ◽  
3D Information

About 6% of global CO2 emissions are due to cement production. Blending of Portland cement with a significant fraction of mineral admixture could therefore be instrumental in reducing such emissions. Use of an admixture of vegetable origin such as rice husk as will additionally contribute to waste management and its incineration produces energy. This paper will stress the importance of properly designing such blends. Preferably gap-graded concepts should be employed, since blending efficiency in terms of strength development is promoted as shown in earlier publications. The paper therefore only briefly covers these aspects. Assessment of this blending concept on durability of cementitious materials constitutes a far more complicated problem. This requires careful porosimetry. Mostly, this problem is approached by MIP or by quantitative image analysis. Both can provide 3D information, although that of MIP is generally significantly biased. Quantitative image analysis is however time-consuming and laborious, and thus expensive. Moreover, it does not provide information on continuity of pores. Present day computer facilities offer therefore a better alternative. When using a proper DEM system, the concrete can be simulated in a realistic way. The paper describes new methods for investigating the pore structure in virtual concrete and presents some data on pure cement and blended cement. Differences will have impact on durability risks.

Lightweight Aggregate Shotcrete: Part 1

2019 ◽  
Vol 815 ◽  
pp. 195-202
Author(s):  
Wen Hui Bian ◽  
Peng Cheng Li ◽  
Chang He Bai
Keyword(s):  
Mechanical Properties ◽  
Silica Fume ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Nano Silica ◽  
Different Types ◽  
Preliminary Research ◽  
The Difference

In this paper, preliminary research on lightweight aggregate shotcrete is carried out. The main discussion is the pumpability and sprayability of light aggregate injection by single-mixed and complex-doped mineral admixture, and the different dosages and different types are studied. The effect of mineral admixture on the physical and mechanical properties of lightweight aggregate shotcrete. The results show that the small amount of fly ash, silica fume and nano-silica can prevent the segregation and bleeding of the mixture. With the increase of the content of silica fume and nano-silica, the pumpability can be reduced. At the same time, the sprayability is increased. It has also been found that, due to the difference in particle size, the mutual complementation of particles between the complex mineral admixtures in terms of physical and mechanical properties results in a significant increase in sprayability and strength.

Relative Humidity of Blended Cement Pastes in Sealed during Hydration

2013 ◽  
Vol 539 ◽  
pp. 60-63
Author(s):  
Dan Jin ◽  
Wu Yao ◽  
Yi Chen
Keyword(s):  
Relative Humidity ◽  
Blended Cement ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Cement Pastes ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Cement Based Materials ◽  
Different Ages ◽  
Key Factor

As an important part of cement-based materials，water plays an important role during hydration and self-desiccation so the measurement of relative humidity or internal moisture in the research of cement-based materials is vital. In this paper, the measurement samples are blended cement pastes in sealed with different water to cement ratios and different kind of mineral admixtures. The measurement was taken at different ages during hydration to investigate the changes of relative humidity. The result showed that the water to cement ratio was the key factor of affecting the change of relative humidity, and the effect of mineral admixture kind was not very obvious in this experiment.

scholarly journals Blended cement hydration assessment by thermogravimetric analysis and isothermal calorimetry

2018 ◽  
Vol 149 ◽  
pp. 01062
Author(s):  
Meriem Meziani ◽  
Nasser Chelouah ◽  
Ouali Amiri ◽  
Nordine Leklou
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Isothermal Calorimetry ◽  
Blended Cement ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Hydration Kinetics ◽  
Scanning Calorimetry ◽  
Cement Pastes ◽  
Degree Of Hydration

In the present study, the hydration of Portland cement pastes containing 5%, 10%, 15% and 20% tuff, limestone filler and granodiorite was investigated by thermogravimetric analysis coupled with differential scanning calorimetry and microcalorimetry isotherm. The monitoring of the hydration kinetics by thermogravimetric analysis made it possible to quantify the quantity of water combined with the cement (nonevaporable water) and the degree of hydration. By coupling this technique to the differential scanning calorimetry, it was also possible to measure the energy absorbed or released by the material during its decomposition. The results showed that the non-evaporable water content and the degree of hydration of the mixtures containing various mineral admixtures were relatively lower with respect to the reference mixture when as the content of mineral admixture increased. The effect of the evolution of the hydration process on the mechanical properties of mortars was also monitored. The relative variation of the compressive strength to that of the flexural strength was evaluated at 7, 28 and 90 days. Results showed that all the mixtures have a greater contribution in flexion than in compression.

scholarly journals Shrinkage Behavior of Conventional and Nonconventional Concrete: A Review

2020 ◽  
Vol 6 (9) ◽  
pp. 1839-1851
Author(s):  
Ahmed Adel Emhemed Elzokra ◽  
Ausamah Al Houri ◽  
Ahed Habib ◽  
Maan Habib ◽  
Ahmad Malkawi
Keyword(s):  
Construction Materials ◽  
Early Time ◽  
Mineral Admixtures ◽  
Concrete Shrinkage ◽  
Concrete Properties ◽  
Absolute Volume ◽  
The World ◽  
Different Types ◽  
Concrete Permeability ◽  
Shrinkage Behavior

Concrete is indeed one of the most consumed construction materials all over the world. In spite of that, its behavior towards absolute volume change is still faced with uncertainties in terms of chemical and physical reactions at different stages of its life span, starting from the early time of hydration process, which depends on various factors including water/cement ratio, concrete proportioning and surrounding environmental conditions. This interest in understanding and defining the different types of shrinkage and the factors impacting each one is driven by the importance of these volumetric variations in determining the concrete permeability, which ultimately controls its durability. Many studies have shown that the total prevention of concrete from undergoing shrinkage is impractical. However, different practices have been used to control various types of shrinkage in concrete and limit its magnitude. This paper provides a detailed review of the major and latest findings regarding concrete shrinkage types, influencing parameters, and their impacts on concrete properties. Also, it discusses the efficiency of the available chemical and mineral admixtures in controlling the shrinkage of concrete.

scholarly journals Significance of properly proportioned fly ash based blended cement for sustainable concrete structures of tannery industry

Structures ◽  
2021 ◽  
Vol 29 ◽  
pp. 1898-1910
Author(s):  
Samira Mahmud ◽  
Tanvir Manzur ◽  
Samina Samrose ◽  
Tafannum Torsha
Keyword(s):  
Fly Ash ◽  
Concrete Structures ◽  
Blended Cement ◽  
Sustainable Concrete ◽  
Tannery Industry

Blended cement binders containing bamboo leaf ash and ground clay brick waste for sustainable concrete

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 101045 ◽  
Author(s):  
John Temitope Kolawole ◽  
Kolapo Olubunmi Olusola ◽  
Adewumi John Babafemi ◽  
Oladimeji Benedict Olalusi ◽  
Ebenezer Fanijo
Keyword(s):  
Blended Cement ◽  
Clay Brick ◽  
Sustainable Concrete ◽  
Bamboo Leaf Ash

Effects of Fly Ash and Granular Blast-Furnace Slag on Development Rate of Strength of Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 371-375
Author(s):  
Ji Wei Cai ◽  
Si Jia Yan ◽  
Gong Lei Wei ◽  
Lu Wang ◽  
Jin Jin Zhou
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Development Rate ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Conventional Concrete ◽  
Enhancing Effect ◽  
Substitution Content ◽  
Furnace Slag

Fly ash (FA) and granular blast-furnace slag (GBFS) are usual mineral admixtures to conventional concrete, and their contents substituted for Portland cement definitely affect development rate of strength of concrete. C30 and C60 concrete samples with FA and/or GBFS were prepared to study the influence of substitution content of the mineral admixtures on 3 d, 7 d and 28 d strength. The results reveal that the development rate of strength in period from 3 d to 7 d gets slow with increasing content of mineral admixtures except for concrete with only GBFS less than 20%. In the case of substituting FA as the only mineral admixture for part of cement, the development rate of strength of C30 concrete in period from 7 d to 28 d keeps roughly constant even that of C60 concrete increases. When substituting mineral admixtures in the presence of GBFS for cement within experimental range, the development rate of strength in period from 7 d to 28 d gets fast with increasing substitution content. The enhancing effect of combining FA and GBFS occurs in period from 7 d to 28 d for both C30 and C60 concretes (FA+GBFS≤40%), even occurs in period from 3 d to 7 d for C60 concrete. Based on 7 d strength and the development rate, 28 d strength of concrete can be predicted accurately.

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