Hydration mechanism and orthogonal optimisation of mix proportion for steel slag–slag-based clinker-free prefabricated concrete

2019 ◽  
Vol 228 ◽  
pp. 117036 ◽  
Author(s):  
Chengwen Xu ◽  
Wen Ni ◽  
Keqing Li ◽  
Siqi Zhang ◽  
Ying Li ◽  
...  
Keyword(s):  
Steel Slag ◽  
Hydration Mechanism ◽  
Mix Proportion

Utilization of Steel Slag as Aggregates for SMA-13

2015 ◽  
Vol 768 ◽  
pp. 402-405 ◽  
Author(s):  
Can Hua Li ◽  
Xiao Dong Xiang ◽  
Xian Xian Qin
Keyword(s):  
Steel Slag ◽  
Road Maintenance ◽  
Modified Asphalt ◽  
The Road ◽  
Water Permeability Coefficient ◽  
Mix Proportion ◽  
Asphalt Content ◽  
Useful Life ◽  
Marshall Stability ◽  
Sbs Modified Asphalt

A new method to make SMA is developed by using SBS modified asphalt when the coarse aggregate steel slag and the fine basalt aggregate are selected respectively. The Mix Proportion is 1#(16-9.5mm, steel slag):2#(9.5-4.75mm, steel slag):3#(3-4.75mm, basalt):4#(3-0mm, basalt):5# (mineral powder)=38%:36%:8%:8%:10%.The optimal asphalt content (OAC) is 6.4%. The mass percentage of steel slag is reached 74%. The costs of this kind of high quality road material can be saved because the amount of asphalt is not increased. Based on Marshall Stability and Splitting Strength test, it is shown that the Marshall stability of SMA is 10.6 kN, dynamic stability is 7800, and tensile strength ratio is 89.2%. All above test values are superior to the standards in China's traffic regulations. The water permeability coefficient of SMA is 65, which means that SMA has an excellence Wear-Resistant performance. Therefore, SMA can increase the road useful life and reduce the road maintenance costs.

Study on the Desulfurization Gypsum and Steel Slag Blended Clinker-Free Cementing Material

2012 ◽  
Vol 193-194 ◽  
pp. 384-388
Author(s):  
Hai Liang Luo ◽  
Chun Sheng Li ◽  
Yi Ting Ye ◽  
Fu Dan Chen
Keyword(s):  
Setting Time ◽  
Steel Slag ◽  
Orthogonal Test ◽  
Raw Material ◽  
Water Quantity ◽  
Hydration Products ◽  
Early Hydration ◽  
Mix Proportion ◽  
Cementing Material ◽  
Micro Analysis

Based on orthogonal test with steel slag and desulfurization gypsum as main raw material, mixed appropriate amount slag and compound addition a little of activator, we explored the slag dosage, the proportion of the combined admixture activator and the desulfurization gypsum dosage impact on the performance of clinker-free cementing material, such as strength, stability, standard consistency water quantity and setting time. The results showed that the best mix proportion of cementing material with slag content 40% and activator A:activator B is equal to 2.78:2.22. We explored the structure and composition of hydration products further more by micro-analysis, such as SEM, EDS and so on. We can found that the cementing material hydration products similar with hydration products of silicate cement. The cementitious material hydration with Afm crystal content increased significantly. The Aft crystal generated in early hydration(3d) gradually transformed into Afm crystal in late hydration(28d) ,and the structure becomes more dense.

Mechanics Properties of the Lime-Steel Slag Stabilized Soil for Pavement Structures

2010 ◽  
Vol 168-170 ◽  
pp. 931-935 ◽  
Author(s):  
Tao Cheng ◽  
Ke Qin Yan
Keyword(s):  
Unconfined Compressive Strength ◽  
Steel Slag ◽  
Strength Test ◽  
Industrial Wastes ◽  
Rigid Pavement ◽  
Fine Grain ◽  
Mix Proportion ◽  
Compressive Strength Test ◽  
Stabilized Soil ◽  
Pavement Structures

Mechanics properties of lime-steel slag stabilized soil for pavement structures are investigated. Firstly, the chemical composition of the fine grain steel slag is analyzed by spectral analysis test. In view of the materials compositions, 5 kinds of mix proportion projects are defined. Compaction tests of all mix proportion projects are carried out in different water conditions to obtain the optimum moisture contents. Then the optimum mix proportion project is demarcated by the unconfined compressive strength test and the compression rebound modulus test. Finally, the pavement structures design for a highway of lime-steel slag stabilized soil road sub-base is made. As comparisons, the pavement structures of other types of lime industrial wastes stabilized soil road sub-base are computed. It is shown that lime- steel slag stabilized soil is suitable for flexible pavement or semi-rigid pavement because of its good strength and rigidity which can effectively reduce thickness of the lower pavement and basic deflection.

scholarly journals Experimental Study on the Workability and Stability of Steel Slag Self-Compacting Concrete

2020 ◽  
Vol 10 (4) ◽  
pp. 1291
Author(s):  
Suiwei Pan ◽  
Depeng Chen ◽  
Xiuling Chen ◽  
Genwang Ge ◽  
Danyang Su ◽  
...  
Keyword(s):  
Raw Materials ◽  
Economic Value ◽  
Steel Slag ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Filling Ability ◽  
Mix Proportion ◽  
Natural Aggregates ◽  
Passing Ability ◽  
Performance Research

There is important application value and economic value in exploring the potential use of steel slag to prepare self-compacting concrete (SCC) and make full use of solid waste resources. In this paper, steel slag self-compacting concrete (SSCC) with relatively ideal workability is prepared by using steel slag instead of natural fine aggregate based on mix proportion optimization and SSCC performance research. The filling ability, passing ability and resistance segregation were tested to evaluate the workability of SSCC. The results show that when the content of steel slag sand is 20%, the workability performance of SSCC is similar to that of SCC with natural aggregates. When the content of steel slag sand is less than 60%, the performance of SSCC can also meet the workability requirements after adjusting the amount of raw materials.

Comparison of Hydration Mechanism between Cements from Two Different Residual Muds

2016 ◽  
Vol 680 ◽  
pp. 466-471
Author(s):  
Zhi Wei Liu ◽  
Yu Li ◽  
Da Qiang Cang ◽  
Hao Ran Wang
Keyword(s):  
Steel Slag ◽  
National Standard ◽  
Arc Furnace ◽  
Dry Process ◽  
Composition Effects ◽  
Hydration Mechanism ◽  
Steel Making ◽  
Bof Slag ◽  
Eaf Slag ◽  
Lower Basicity

Steel slags are byproduct of steel making process in blast oxidizing furnace (BOF) and electric arc furnace (EAF), including BOF slag, EAF slag. Residual slag mud is discharged after recover of iron from steel slag by magnetic separation after a wet grinding process. The wet disposal process has higher efficiency than dry process but would deteriorate cementitious reactivity of wet residual mud. For residual EAF slag mud and residual BOF slag mud have different composition, effects of wet disposal process on their reactivity and hydration mechanism of related cements were researched in the paper. Analyses of microstructure and testes of mechanical properties for cements from the two different mud showed that the cements composed of 25 % of different mud respectively can reach the national standard of 42.5 grade cements. But residual EAF slag mud has better reactivity. Cement composed of residual EAF slag mud had a higher increase of compressive strength during 28 days of hydrations, and fluffy C-S-H gel and needlelike AFt crystal would increase obviously. Reactivity of BOF slag would degraded more in wet disposal process for its quicker hydration than EAF slag which resulted in more Ca(OH)2 and C-S-H gel formed in the discharged mud,. EAF had lower basicity, content of less f-CaOand C3S, more P2O5 and C2S, which would contribute to its stability in the wet disposal process. EAF slag is more suitable for wet-disposal process.

Hydration Mechanism of Sustainable Clinker-Free Steel Slag Binder and Its Application in Mine Backfill

JOM ◽  
2021 ◽  
Vol 73 (4) ◽  
pp. 1053-1061
Author(s):  
Bolin Xiao ◽  
Shengjun Miao ◽  
Qian Gao ◽  
Boyu Chen ◽  
Shenghui Li
Keyword(s):  
Steel Slag ◽  
Mine Backfill ◽  
Hydration Mechanism

Study on the Mix Proportion Design of C30 Supersulphated Phosphogysum-Slag Cement (SSC) Concrete

2014 ◽  
Vol 1065-1069 ◽  
pp. 1950-1956
Author(s):  
Sha Ding ◽  
Guo Zhi Zhang ◽  
Fei Xiang Chen
Keyword(s):  
Portland Cement ◽  
Optimization Design ◽  
Design Method ◽  
Steel Slag ◽  
Cement Clinker ◽  
Slag Cement ◽  
Granulated Blast Furnace Slag ◽  
Mix Proportion ◽  
Portland Cement Clinker ◽  
Furnace Slag

supersulphated phosphogysum-slag cement (SSC) is a newly developed non-burned cementitious material. It’s mixed and ground with 40%-50% phosphogypsum, 40%-50% ground granulated blast-furnace slag (GGBFS), 2% steel slag and 4% portland cement clinker. But the component of SSC differs greatly from that of Portland cement, there is few application researches about the SSC. In order to realize resourceful utilization of phosphogypsum, the mix proportion design method of SSC are studied. The mix proportion design method for C30 are systematically studied and a design optimization was carried out. According to the design regulations of mix proportion of ordinary concrete and the characteristics of SSC, the C30 high flowing concrete is prepared, and the optimum water-cement ratio is obtained based on revised Bowromi formula. According to the mix proportion optimization design, the 28d strength of SSC is up to 38.5MPa.

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