scholarly journals Study on Strength and Microstructure of Cement-Based Materials Containing Combination Mineral Admixtures

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Meijuan Rao ◽  
Jianpeng Wei ◽  
Zhiyang Gao ◽  
Wei Zhou ◽  
Qiaoling Li ◽  
...  
Keyword(s):  
Testing Machine ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Strength Development ◽  
Hydration Products ◽  
Cement Based Materials ◽  
Aggregate Effect

The compressive strength of complex binders containing two or three blended mineral admixtures in terms of glass powder (GP), limestone powder (LP), and steel slag powder (SP) was determined by a battery solution type compressive testing machine. The morphology and microstructure characteristics of complex binder hydration products were also studied by microscopic analysis methods, such as XRD, TG-DTA, and SEM. The mechanical properties of the cement-based materials were analyzed to reveal the most appropriate mineral admixture type and content. The early sample strength development with GP was very slow, but it rapidly grew at later stages. The micro aggregate effect and pozzolanic reaction mutually occurred in the mineral admixture. In the early stage, the micro aggregate effect reduced paste porosity and the small particles connected with the cement hydration products to enhance its strength. In the later stage, the pozzolanic reaction of some components in the complex powder occurred and consumed part of the calcium hydroxide to form C-S-H gel, thus improving the hydration environment. Also, the produced C-S-H gel made the structure more compact, which improved the structure’s strength.

scholarly journals The Role of Various Powders during the Hydration Process of Cement-Based Materials

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Shuhua Liu ◽  
Hongling Wang ◽  
Jianpeng Wei
Keyword(s):  
Early Stage ◽  
Steel Slag ◽  
Pozzolanic Reaction ◽  
Hydration Process ◽  
Limestone Powder ◽  
Strength Development ◽  
Early Hydration ◽  
Cement Based Materials ◽  
Early Strength

The role of various powders including glass powder (GP), limestone powder (LP), and steel slag powder (SSP) during the hydration process of cement-based materials was investigated by using X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and strength tests. GP has adverse impact on early strength, but the pozzolanic reaction at later stage enhances the strength development greatly. LP can significantly improve early strength. SSP has a good contribution to the early and later strength of the paste when its content is less than 15%. GP has little effect on the kind of hydration products but relatively large effects on the quantity. Calcium hydroxide (CH) content of GP paste decreases over curing age gradually, which is different from pure cement paste because its pozzolanic activity consumes more CH than that generated from the cement hydration. SSP and LP mainly play a role of filling effect at early stage. Nucleating effect of LP also promotes the early hydration of cement. The hydration of LP occurs at later stage and forms the calcium carboaluminate hydrates. The hydration of SSP is relatively slow, which generates CH at later stage and is effective in the strength development.

scholarly journals Influence of Inertia and Low Active Mineral Admixture on Strength and Microstructure of Cement-Based Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Meijuan Rao ◽  
Wan Tang ◽  
Wei Zhou ◽  
Yaning Kong ◽  
Shuhua Liu
Keyword(s):  
Fly Ash ◽  
Early Stage ◽  
Heat Of Hydration ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Inert Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cement Based Materials

Cement-based materials were investigated by comparing the strength and microstructure of pastes and mortar containing limestone powder or low quality fly ash. The compressive strength of the mortar at 28 and 90 d was examined whose microstructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis, and differential thermal analysis (TG-DTA). The results indicated that the strength of mortar decreased with increasing mineral admixtures. The limestone powder mainly acted as inert filler and hardly took part in the chemical reaction. Low quality fly ash may accelerate the formation of hydration products in samples with more chemically bonded water. This further resulted in a higher degree of cement hydration and denser microstructure, while the overall heat of hydration was reduced. At the early stage of hydration, low quality fly ash can be considered as an inert material whereas its reactivity at the later stage became high, especially for ground low quality fly ash.

Influence of Limestone Powder on the Hydration of Cement-Steel Slag Composite Binder

2014 ◽  
Vol 988 ◽  
pp. 226-229
Author(s):  
Mu Tian Liu ◽  
Jin Hu ◽  
Ying Jun Mei
Keyword(s):  
Compressive Strength ◽  
Steel Slag ◽  
Hydration Heat ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Hydration Products ◽  
Early Hydration ◽  
Composite Binder ◽  
Negative Effect ◽  
Positive Effect

Steel slag and limestone powder are both mineral admixtures for cement or concrete. Steel slag can react with water and produce hydration products. The hydration activity of limestone powder is very limited. This paper investigated the influence of limestone powder on the hydration of cement-steel slag composite binder by determining the hydration heat and compressive strength. The results show that limestone powder can promote the early hydration of the composite binder and the compressive strength of mortar increases by replacing part of steel slag by limestone powder. However, at the age of 28 days, the positive effect of limestone powder is almost equal to its negative effect, so the compressive strength of mortar changes little by replacing part of steel slag by limestone powder.

scholarly journals Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5450
Author(s):  
Kanako Toda ◽  
Ryosuke Kikuchi ◽  
Tsubasa Otake ◽  
Satoshi Nishimura ◽  
Yuzoh Akashi ◽  
...  
Keyword(s):  
Humic Acid ◽  
Steel Slag ◽  
Construction Materials ◽  
Engineering Application ◽  
Pozzolanic Reaction ◽  
Strength Development ◽  
Organic Matters ◽  
Development Indicators ◽  
Dredged Soil ◽  
Accelerate Evaluation

Dredged soils have been used as construction materials by alkaline activation with steel slag (steel slag-dredged soil mixtures) at harbors. Such mixtures develop strength chiefly by calcium silicate hydrate (C-S-H) formation by the pozzolanic reaction. However, the strength of such mixtures is unpredictable, and in some cases, mixtures have been too soft for the intended engineering application. An identification of strength development indicators would accelerate evaluation processes for strength development to facilitate and promote the utilization of such materials. This paper focuses on the relationship between the characteristics of soil organic matters in dredged soils and the strength development of the mixtures by a comparison of eight dredged soils collected from eight different Japanese harbors. The characteristics of the soil organic matters were identified to determine as indicators of mixtures with weak strength development, i.e., enriched sulfur content in extracted soil organic matter (humic acid) fraction, and the N/C ratio of humic acid similar to land humic acid standards. Increases in the validated fraction of dredged soils and steel slag by replacing fractions disadvantageous to construction resources would contribute to reduce waste production, which would lower the environmental impact of the use, aiming to achieve sustainable utilization of such materials.

scholarly journals Minimum Water Requirement Method for High-Performance Sulphoaluminate Cement-Based Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Hong-ping Zhang ◽  
Pei-kang Bai ◽  
Jian-hong Wang ◽  
Yan-li Dong ◽  
Yun-shan Han
Keyword(s):  
Cement Paste ◽  
High Performance ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Water Requirement ◽  
Mineral Admixtures ◽  
Poor Correlation ◽  
Sulphoaluminate Cement ◽  
Cement Based Materials ◽  
Orthogonal Tests

In this work, we propose the use of steel slag instead of slag powder, in addition to fly ash and silica fume, to obtain high-performance sulphoaluminate cement-based materials. According to the closest-packing theory and on the basis of the minimum water requirement test, the influence of mineral admixtures on the minimum water requirement was evaluated for sulphoaluminate composite system paste. The optimal composition of the cementitious materials was thus determined. Orthogonal tests were used to assess the validity of this ratio. The correlation between minimum water requirement and the standard consistence was not only analyzed in the system of the minimum water requirement method decided but also in the complicate system of the orthogonal tests determined. Experimental results show that the influence of steel slag on the minimum water requirement is the largest in composite cement paste; minimum water requirement and standard consistency have a good correlation; the cement paste designed with the optimum composite had the highest strength of all the tested materials, but minimum water requirement and strength have a poor correlation in the orthogonal tests. We demonstrate that standard consistency evaluation can replace the minimum water requirement method to determine the optimum ratio of cement mineral admixtures. The proposed method not only simplifies the process but also makes the method more scientific.

Research on Polypropylene Fiber and Mineral Admixtures on Fluidity of Cement-Based Materials

2011 ◽  
Vol 328-330 ◽  
pp. 1301-1304
Author(s):  
Xue Fei Li ◽  
Tao Guo
Keyword(s):  
Fly Ash ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Maximum Flow ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Polypropylene Fibers ◽  
Intensity Level ◽  
Reticular Fibers ◽  
Cement Based Materials

The purpose of this paper is based on the cement-based materials by adding fibers and mineral admixtures for composite, to cement the improvement of liquidity. Experiment with the intensity level of 42.5 ordinary portland cement, by adding polypropylene fibers, slag and fly ash cement mortar as a mineral admixture, the production of cement mortar matrix for the test, were conducted on a variety of mix Fluidity test. Experiments show that the addition of polypropylene fiber is not conducive to the mobility of mortar, especially monofilament fiber was more obvious than the reticular fibers. To join the slag, fly ash, mortar fluidity increased, indicating that slag and fly ash added to improve the workability of cement-based materials. When the fiber content reaches the maximum degree of maximum flow, indicating that slag, fly ash and polypropylene fibers will increase the combined effect of fluidity value. This innovation is obtained by adding fiber cement-based materials for toughening effect, with the use of mineral admixture can improve the overall performance of cement based materials, with further research and promotion value.

scholarly journals The use of non-destructive tests to estimate Self-compacting concrete compressive strength

2018 ◽  
Vol 149 ◽  
pp. 01036
Author(s):  
Boukhelkhal Djamila ◽  
Guendouz Mohamed
Keyword(s):  
Compressive Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Mineral Admixture ◽  
Limestone Powder ◽  
Mineral Admixtures ◽  
Self Compacting Concrete ◽  
Correlation Relationship ◽  
Granulated Slag

Until now, there are few studies on the effect of mineral admixtures on correlation between compressive strength and ultrasonic pulse velocity for concrete. The aim of this work is to study the effect of mineral admixture available in Algeria such as limestone powder, granulated slag and natural pozzolana on the correlation between compressive strength and corresponding ultrasonic pulse velocity for self-compacting concrete (SCC). Compressive strength and ultrasonic pulse velocity (UPV) were determined for four different SCC (with and without mineral admixture) at the 3, 7, 28 and 90 day curing period. The results of this study showed that it is possible to develop a good correlation relationship between the compressive strength and the corresponding ultrasonic pulse velocity for all SCC studied in this research and all the relationships had exponential form. However, constants were different for each mineral admixture type; where, the best correlation was found in the case of SCC with granulated slag (R2 = 0.85). Unlike the SCC with pozzolana, which have the lowest correlation coefficient (R2 = 0.69).

Improving Effect of Mineral Admixtures on Volume Stability of Steel Slag Mortar

2009 ◽  
Vol 620-622 ◽  
pp. 619-622
Author(s):  
Yun Xia Lun ◽  
Ming Kai Zhou ◽  
Xiao Cai
Keyword(s):  
Flexural Strength ◽  
Linear Expansion ◽  
Steel Slag ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Compaction Rate ◽  
Volume Stability

The effect of two kinds of mineral admixtures (MA) on volume stability of steel slag mortar (SSM) is investigated in order to solve the expansion problem due to steel slag. The rate of linear expansion and flexural strength of SSM containing mineral admixture have been compared with control specimens. Addition of FA and GGBFS slowed down the rate of expansion gain and prolonged the stable ages of SSM. In addition, FA and GGBFS increased later flexural strength of SSM. The improving effect of FA and GGBFS on volume stability of SSM was attributed to the increase of later flexural strength and enhancement of compaction rate.

scholarly journals Use of CO2 to Cure Steel Slag and Gypsum-Based Material

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5174
Author(s):  
Xue Wang ◽  
Wen Ni ◽  
Jiajie Li ◽  
Siqi Zhang ◽  
Keqing Li ◽  
...  
Keyword(s):  
Co2 Capture ◽  
Building Materials ◽  
Steel Slag ◽  
Binding Energies ◽  
Strength Development ◽  
Co2 Uptake ◽  
Hydration Products ◽  
Al Content ◽  
High Al Content ◽  
Carbonation Curing

To improve the utilization of steel slag (SS) in CO2 capture and making building materials, the paper mainly discussed the effects of desulphurization gypsum (DG) and w/s ratio on strength development and CO2 capture capability of high Al content SS. It showed that 10 wt% DG enhanced the strength of hydration-curing SS by 262% at 28 days. Similarly, adding 6 wt% DG in carbonation-curing SS contributed to increases in strength and CO2 uptake by 283% and 33.54%, reaching 42.68 MPa and 19.12%, respectively. Strength decreases and CO2 uptake increases with w/s. Microanalysis (QXRD, SEM-EDS, TG-DTG, FTIR, XPS, and MIP) revealed that the main hydration products of SS were C-S-H gel and C4AH13, which transformed to ettringite with DG addition. The carbonation products were mainly calcite and aragonite. Additionally, the amount of aragonite, mechanically weaker than calcite, decreased and calcite increased significantly when DG was added in carbonation-curing samples, providing a denser structure and higher strength than those without DG. Furthermore, high Al 2p binding energies revealed the formation of monocarboaluminate in the DG-added carbonation samples, corresponding to higher CO2 uptake. This study provides guidance for the preparation of SS-DG carbide building materials.

Effect of Steel Slag Powder on the Durability of High Performance Concrete

2009 ◽  
Vol 79-82 ◽  
pp. 175-178 ◽  
Author(s):  
Yun Feng Li ◽  
Yang Liu ◽  
Rong Qiang Du ◽  
Fan Ying Kong
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Effective Means ◽  
Steel Slag ◽  
Chloride Penetration ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Slag Powder ◽  
Steel Slag Powder

dvanced mineral admixtures can lead to economical high performance concrete with enhanced durability and reduced cement content. When super fine steel slag powder is mixed into concrete as active admixture, resistance to abrasion and resistance to chloride penetration are improved as well as workability and mechanical properties of the concrete. Resistance to abrasion of steel slag concrete is measured and resistance to chloride penetration is also determined by the method of NEL and ASTM C1202 in this paper. Result shows that compound mineral admixtures as partial replacement for Portland cement in mortar enhance abrasion resistance. Mixing mineral admixture is an effective means for controlling the chloride permeability. Concrete specimens prepared with compound mineral admixture with steel slag powder and blast furnace slag powder has very low permeability.

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