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 Progress on Early Autogenous Shrinkage of Cement-Based Cementitious Materials

2013 ◽  
Vol 634-638 ◽  
pp. 2738-2741
Author(s):  
Wei Huang ◽  
Tao Zhang ◽  
Yun Yun Xu
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Research Work ◽  
Autogenous Shrinkage ◽  
Cementitious Materials ◽  
Mineral Admixtures ◽  
Research Progress ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Improvement Measures

Concrete autogenous shrinkage phenomenon would adversely affect the mechanical properties and durability of concrete, this phenomenon is important. Autogenous shrinkage problem of low water-cement ratio of the with high mineral admixtures, cement-based cementitious materials was introduced. The main reason for high-performance concrete early cracking being autogenous shrinkage was pointed out. Based on the home and abroad research status of low water cement ratio of the cement paste and concrete autogenous shrinkage, especially for early autogenous shrinkage phenomenon, the mechanism of autogenous shrinkage and the measure method is presented, and the improvement measures and the possible problems the need for further research work is presented.

Study on the Workability of High Performance Concrete Mixture with Compound Mineral Admixtures

2013 ◽  
Vol 671-674 ◽  
pp. 1839-1843
Author(s):  
Yuan Gang Wang ◽  
Chao Wan ◽  
Kai Jian Huang ◽  
Gao Qin Zhang ◽  
Ya Feng Hu
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Orthogonal Experiment ◽  
Steel Slag ◽  
Mineral Admixtures ◽  
Impact Factors ◽  
Slag Powder ◽  
Granulated Blast Furnace Slag ◽  
Binder Ratio ◽  
Water Binder Ratio

Several compound mineral admixtures, such as steel slag powder, granulated blast furnace slag powder and silica fume, are mixed with proper proportion to improve the workability of High Performance Concrete（HPC）. Through the orthogonal experiment, workability of HPC is analyzed on water-binder ratio, sand ratio, the amount of superplasticizer and the amount of compound mineral admixtures. Results show that: workability of HPC was significantly effected by the amount of naphthalene sulphonate water-reducing admixture and water-binder ratio, the amount of compound mineral admixtures and sand ratio are impact factors on the workability in a certain extent.

Effect of Composition of Cementitious Materials on Alkalinity of Pore Solution and Strength of Cement Paste

2013 ◽  
Vol 671-674 ◽  
pp. 1732-1735
Author(s):  
Xiao Lu Yuan ◽  
Shi Hua Zhou ◽  
Dong Mei Liu
Keyword(s):  
Compressive Strength ◽  
Cement Paste ◽  
Pore Solution ◽  
Ph Value ◽  
Cement Content ◽  
Cementitious Materials ◽  
Mineral Admixtures ◽  
Aluminate Cement

Alkalinity of the surroundings is the basis to study the MICP technology. Alkalinity of pore solution and strength of cement paste made of various cementitious materials were studied. Results show that the alkalinity of pore solution of cement paste decreased with the increase of sulpho-aluminate cement content. pH value of cement paste was about less than 10 when sulpho-aluminate cement content exceeded 75%. Incorporation of sulpho-aluminate cement decreased compressive strength of paste obviously; however, compressive strength of paste was improved when the addition of sulpho-aluminate cement was more than 75%. Addition of mineral admixtures reduced the alkalinity of pore solution of cement paste and increased its compressive strength. Compressive strength of specimens was decreased when the content of mineral admixtures increased.

scholarly journals Effect of quartz powder and mineral admixtures on the properties of high-performance concrete

Vestnik MGSU ◽  
2019 ◽  
pp. 102-117 ◽  
Author(s):  
Duc Vinh Quang Nguyen ◽  
Olga V. Aleksandrova ◽  
Yuriy M. Bazhenov
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Cement Paste ◽  
High Performance ◽  
High Performance Concrete ◽  
Mineral Admixtures ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Quartz Powder ◽  
Additional Reduction

Introduction. This study focuses on the use of silica fume partially replacing cement with 0, 5, 7.5, 10, 12.5 and 30 % constant replacement of fly ash by weight of cement in concrete. Concrete is probably the most extensively used construction material in the world. But the conventional concrete is losing its uses with time and high-performance concrete (HPC) is taking that place. HPC has superior mechanical properties and durability to normal strength concrete. Because of, the microstructure of HPC is more homogeneous than that of normal concrete (NC) due to the physical and chemical contribution of the mineral admixtures as well as it is less porous due to reduced w/c ratio with the addition of a superplasticizer. The inclusion of additives helped in improving the properties of concrete mixes due to the additional reduction in porosity of cement paste and improving the particle packing in the interfacial transition zone (between cement paste and the aggregates).In this experimental investigation the behavior of HPC with silica fume and fly ash with and without quartz powder were studied. The water-binder ratio was kept 0.3 and 20 % quartz flour as partial replacement of fine aggregate for all cases. Materials and methods. Used materials in Vietnam, as follow, Sulfate-resisting Portland cement - PCSR40 (type V) of company Luks Cement (Vietnam) Limited was used in the work. Crushed granite of fraction 9.5…20 mm - as coarse aggregate, Natural sand from Huong river of 0.15…2.5 mm fraction with the fineness modulus of about 3.0 and quartz powder with an average particle size of 5…10 μm were used as fillers; Sika® Viscocrete®-151 is a superplasticizer based on a blend of 3rd generation PCE polymers was used as a plasticizing admixture. The flg ash from Pha Lai thermal power plant and Sika silica Sikacrete® PP1 (particle size < 0.1 μm) was used as a mineral active admixture. The study of strength and technological properties of high-performance concrete was performed by using standard methods. Results. Established by icate that, the workability and strength increase at a certain level and after that, they decline with further increase in the replacement level of silica fume is 12.5 %, on the basis of 30 % FA replacement, the incorporation of 10 % SF showed equivalent or higher mechanical properties and durability compared to the reference samples. Conclusions. HPC consists of mineral admixtures such as silica fume and fly ash use combine quartz powder and superplasticizer helped in improving the strength and durability of concrete mixes due to the additional reduction in porosity of cement paste and an improved interface between it and the aggregate. With 30 % fly ash is optimum dosage used to replacement of cement, incorporation 10 % SF (by weight) and combine of partial replacement of fine aggregate by 20 % quartz powder. On the other hand, a few mathematical equations can be used to derive the durability properties of concrete based on its compressive strength.

Properties of Green Concrete Mixes Containing Metakaolin, Micro Silica, Steel Slag, and Recycled Mosaic Tiles

2020 ◽  
Vol 27 (3) ◽  
pp. 45-60
Author(s):  
Muataz Nayel ◽  
Ammar Khazaal ◽  
Waleed Alabdraba
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Modulus Of Rupture ◽  
Fine Aggregate ◽  
Compressive Strength Of Concrete ◽  
Micro Silica ◽  
Recycled Steel

Recently, the constructions industry begins to make concrete more sustainable, side by side, with making its high performance. This paper aims to investigate the effect of (Metakaolin and Micro Silica) when they replace cement by (8, 12 and 16) % and (6, 9 and 12) % respectively, recycled steel slag when replaces fine aggregate by (10, 20 and 30) %, and recycled mosaic tiles when replaces coarse aggregate by (33.33, 66.67 and 100) % each one another on the slump, density, absorption and compressive strength of concrete. The experimental results showed that the maximum reduction ratio of cement reach (17%) (8% of metakaolin and 9% Micro Silica) while the optimum percentage of mosaic tiles and steel slag is (100%) and (20%) respectively. The optimum percentages obtained are combining to produce three basic green mixes: 1) 17% (8% of Metakaolin and 9% of Micro Silica) only, (2) A mix containing 17% of (Metakaolin and of Micro Silica) plus 100% of recycled mosaic, (3) 17% of (Metakaolin and Micro Silica), 100% of recycled mosaic and 20% of slag. Compressive strength at (7, 28, and 60) days, modulus of rupture at (28) days, absorption, fresh and hardened density are investigated. The best improvement in compressive strength compared with reference concrete was recorded (20.06, 10.855 and 9.983) % at (7, 28 and 60) days respectively for the mix containing (17% of cementitious materials plus 100% of recycled mosaic) while the ultimate flexure strength (24) % appeared in green mix containing (17% of cementitious materials, 100% of recycled mosaic and 20% of slag). Generally, an inverse relationship between density and absorption in all trail mixes which are conducted

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.

Shrinkage Cracking of High Performance Concrete Mixed with Steel Slag Admixture

2011 ◽  
Vol 462-463 ◽  
pp. 867-871 ◽  
Author(s):  
Yun Feng Li ◽  
Hua Xun Guo ◽  
Ling Ling Wang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Concrete Structures ◽  
Mineral Admixtures ◽  
Maintenance Cost ◽  
Shrinkage Stress ◽  
Early Age ◽  
Restrained Shrinkage ◽  
Shrinkage Cracking

Cracking due to the restrained shrinkage stress has been frequently observed at early age in concrete structures. Early-age deterioration of concrete due to cracking and higher maintenance cost for poor durability cause serious troubles to concrete structures. Steel slag includes a certain scale mineral such as C2S and C3S, and can be applied in cement and concrete as mineral admixtures. Two tests are outlined to quantify the behaviour of concrete under restrained shrinkage using plate and ring specimens. The results show that mineral admixtures can be used to reduce cracking in concrete. The risk of cracking can be estimated for steel slag concrete, so that it will improve the durability of concrete structures.

scholarly journals High Performance Self-Compacting Concrete with Electric Arc Furnace Slag Aggregate and Cupola Slag Powder

2020 ◽  
Vol 10 (3) ◽  
pp. 773 ◽  
Author(s):  
Israel Sosa ◽  
Carlos Thomas ◽  
Juan Antonio Polanco ◽  
Jesus Setién ◽  
Pablo Tamayo
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
High Density ◽  
Supplementary Cementitious Materials ◽  
Arc Furnace ◽  
Slag Powder

The development of self-compacting concretes with electric arc furnace slags is a novelty in the field of materials and the production of high-performance concretes with these characteristics is a further achievement. To obtain these high-strength, low-permeability concretes, steel slag aggregates and cupola slag powder are used. To prove the effectiveness of these concretes, they are compared with control concretes that use diabase aggregates, fly ash, and limestone supplementary cementitious materials (SCMs, also called fillers) and intermediate mix proportions. The high density SCMs give the fresh concrete self-compacting thixotropy using high-density aggregates with no segregation. Moreover, the temporal evolution of the mechanical properties of mortars and concretes shows pozzolanic reactions for the cupola slag. The fulfillment of the demands in terms of stability, flowability, and mechanical properties required for this type of concrete, and the savings of natural resources derived from the valorization of waste, make these sustainable concretes a viable option for countless applications in civil engineering.

scholarly journals Enhancing ultra-early strength of sulphoaluminate cement-based materials by incorporating graphene oxide

2020 ◽  
Vol 9 (1) ◽  
pp. 17-27 ◽  
Author(s):  
Yushi Liu ◽  
Minjie Jia ◽  
Chengzhe Song ◽  
Shuang Lu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Graphene Oxide ◽  
High Performance ◽  
Mechanism Analysis ◽  
Practical Application ◽  
Heat Measurement ◽  
Sulphoaluminate Cement ◽  
Cement Based Materials ◽  
Early Strength

AbstractIn order to meet the increasing engineering requirements, the ultra-early strength of sulphoaluminate cement (SAC)-based materials need to be improved to achieve road repair, engineering rescue and other objectives. Graphene oxide (GO) of 0.04 wt% was incorporated into SAC mortar to prepare GO enhanced SAC mortar (GO-SAC). It was found that the compressive strength of GO-SAC was increased by 46.9% at the age of 6 hours, and the flexural strength of GO-SAC was increased by 121.4% at the age of 100 minutes, compared with the control SAC mortar. The mechanism analysis based on the characterization results derived from XRD, BET, in situ ATR-FTIR, hydration heat measurement, TG–DSC and SEM showed that, the addition of minute quantities of GO led to the formation and growth of ribbon-like AFt,which further resulted in the improvement of the ultra-early strength of GO-SAC. This work indicates that GO has great potential for practical application in the preparation of high-performance SAC-based materials with ultra-early strength.

Impact of Composite Mineral Admixture on Carbonization Resistance of High Performance Concrete

2015 ◽  
Vol 1095 ◽  
pp. 248-253 ◽  
Author(s):  
Yuan Gang Wang ◽  
Peng Ma ◽  
Kai Jian Huang ◽  
Gao Qin Zhang ◽  
Ya Feng Hu
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Test Results ◽  
Ternary Composite ◽  
Resistance Property

Fly ash, silica fume and ground steel slag are chosen to make up composite mineral admixtures. Through the orthogonal test, carbonization resistance property of High Performance Concrete (HPC) mixed with composite mineral admixtures is studied. Test results show that the carbonization resistance property of HPC can be improved with defined amount of composite mineral admixture mixed, in addition, the effect of ternary composite admixture of ground steel slag, fly ash and silica fume is more obvious than that of binary composite admixture.

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