scholarly journals Selective Exploration and Experimental Research of a New Filling Cementitious Material

2019 ◽  
Vol 136 ◽  
pp. 03006
Author(s):  
Li Xin ◽  
Guo Lijie ◽  
Xu Wenyuan ◽  
Li Wenchen
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Performance Evaluation ◽  
Experimental Research ◽  
Theoretical Basis ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Actual Situation ◽  
Iron Mine ◽  
Better Than

The method of stage vacant place and subsequent filling has been used in an iron mine in Anhui province, but the effect of underground filling with local cement dose not meet the requirements. Therefore, the cementitious material was developed which suitable for the actual situation of the mine. In this paper, the basic properties, fluidity of filling slurry and strength of filling body between local cement and cementitious materials are compared and studied. The experimental results show that the diffusion of filling slurry with new cementitious material is higher 37.93% than the filling slurry with local cement, and the compressive strength of filling body is higher 75.82% than the filling body with local cement. The testing indexes of the new cementitious material are better than the local cement. Therefore, the new cementitious material for mining can be well adapted to the cemented filling of tailings in this mine. Through the comparative experimental study in this paper, the data support and theoretical basis of performance evaluation and industrial application are provided for mine filling cementitious materials.

The Experimental Study on Performance of the High-Content Slag Cementitious Materials

2013 ◽  
Vol 634-638 ◽  
pp. 311-316
Author(s):  
Ping Yang ◽  
Zhi Gui Qin ◽  
Wei Xia Zhao ◽  
Xi Nan Cai ◽  
Xiao Lin Yuang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mass Production ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Heat ◽  
Raw Material ◽  
Heat Temperature ◽  
Economic Profit ◽  
Easy Operation

The research adopts the raw material of 89% slag with the composite activators and the compressive strength, hydration heat, temperature and expansion property of the material are studied. And the new cementitious material is obtained with the properties of low-heat and small expansion, convenience-confect, easy-operation and need no mass production. This material has the remarkable economic profit and good application foreground especially in the mass grouting engineering.

Study on the Cementitious Proportion of Cemented Mine Tailings

2013 ◽  
Vol 395-396 ◽  
pp. 499-502
Author(s):  
Yun Bing Hou ◽  
Bo Peng ◽  
Bing Wen Wang ◽  
Hui Yu ◽  
Xin Jie Kong ◽  
...  
Keyword(s):  
Portland Cement ◽  
Mine Tailings ◽  
Cementitious Materials ◽  
Strength Test ◽  
Cementitious Material ◽  
Mixing Ratio ◽  
Iron Mine ◽  
The Law ◽  
Better Than

The cementation technology to deal with the mine tailings is adding cementation material and then dehydrating tailings and piling on suitable spot. In order to find the law of the mixing ratio of the cementitious material of the mine tailings of Xishimen Iron Mine, Portland cement and cementitious material A are selected to be compared in the experiment of strength test of cementation of the mine tailings of Xishimen Iron Mine. The result shows that both kinds of cementitious materials can meet the needs when the mixing ratio is 2-3%, but the cementation performance of material A is better than Portland cement. The experiment of adding admixture to improve the cementation performance of material A is carried and the result shows that Na2CO3 and KAl(SO4)2•12H2O can improve the strength of cemented whole tailings while Na2SO4 , CaSO4 and Na2SiO3is helpless to improve the strength.

scholarly journals The Compressive Strength of High-Performance Concrete and Ultrahigh-Performance

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
E. H. Kadri ◽  
S. Aggoun ◽  
S. Kenai ◽  
A. Kaci
Keyword(s):  
Experimental Data ◽  
Compressive Strength ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Cementitious Materials ◽  
Strength Gain ◽  
Proposed Model ◽  
Partial Cement Replacement ◽  
Better Than

The compressive strength of silica fume concretes was investigated at low water-cementitious materials ratios with a naphthalene sulphonate superplasticizer. The results show that partial cement replacement up to 20% produce, higher compressive strengths than control concretes, nevertheless the strength gain is less than 15%. In this paper we propose a model to evaluate the compressive strength of silica fume concrete at any time. The model is related to the water-cementitious materials and silica-cement ratios. Taking into account the author's and other researchers’ experimental data, the accuracy of the proposed model is better than 5%.

Experimental Research on Water Cushion Belt Conveyor

2013 ◽  
Vol 431 ◽  
pp. 88-92
Author(s):  
Ai Dong Zhang ◽  
Ri Cheng Xu ◽  
Yun Meng ◽  
Xun Fan
Keyword(s):  
Experimental Study ◽  
Influencing Factors ◽  
Experimental Research ◽  
Industrial Application ◽  
Theoretical Basis ◽  
Belt Conveyor ◽  
New Type ◽  
Air Cushion

Water cushion belt conveyor is a new type of continuous conveyor which develops from belt conveyor and air cushion belt conveyor .By experimental research on water cushion belt conveyor ,we can observe the condition of water cushion and accomplish the date acquisition of water cushion pressure .Analyzing the pressure ,we can get influencing factors of water cushion pressure and verify the feasibility of industrial application of water cushion belt conveyor .Combining theory study with experimental study ,provide theoretical basis and guide for the further progress of water cushion belt conveyor .

Study on CO2 Sequestration Property of Cement Based Composite Cementitious Materials Containing Steel Slag Used in Road

2011 ◽  
Vol 311-313 ◽  
pp. 1949-1952 ◽  
Author(s):  
Ying Li Gao ◽  
Ling Cheng
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Compressive Strength ◽  
Mass Fraction ◽  
Carbon Emission ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Current Situation ◽  
Cementitious Material

Cement based composite cementitious material containing steel slag used in road has been prepared to deal with the current situation that the transportation carbon emission increased year by year. In this material, 40% cement has been replaced by equivalent steel slag, which has the ability of CO2sequestration. This paper studied the CO2sequestration effect and the mechanical properties of the pure cement, the pure steel slag, and the cement based composite cementitious materials containing steel slag. It has been shown that the cement based composite cementitious materials containing steel slag have excellent CO2sequestration property. The mass fraction growth rate of carbon reached 10.86% after 1 hour carbonation experiment, the value between which of pure cement and pure steel slag, and the compressive strength of the composite cementitious materials at 28-day age can reach 45.3MPa, meeting the requirements of road.

scholarly journals Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

2018 ◽  
Vol 8 (9) ◽  
pp. 1537 ◽  
Author(s):  
Gaili Xue ◽  
Erol Yilmaz ◽  
Weidong Song ◽  
Shuai Cao
Keyword(s):  
Compressive Strength ◽  
Mine Tailings ◽  
Low Cost ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Solid Wastes ◽  
Fine Grained ◽  
Activated Slag ◽  
The Relationship ◽  
Alkali Activated

With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder’s internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax3 − bx2 + cx − d. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine’s UCS requirements with a relatively low cost (17.04–17.20 €/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders.

Experimental Research on Tailings Briquetting for Filling Mining Subsidence Area in Jinshandian Iron Mine

2012 ◽  
Vol 594-597 ◽  
pp. 310-315
Author(s):  
Cui Feng Du ◽  
Ying Zuo ◽  
Hao Feng Li ◽  
Shui Ping Wang
Keyword(s):  
Numerical Simulation ◽  
Compressive Strength ◽  
Experimental Research ◽  
Maximum Stress ◽  
Mining Subsidence ◽  
Drawing Process ◽  
Subsidence Area ◽  
Iron Mine

This paper analyzed the feasibility of tailings briquetting for filling mining subsidence area based on the actual conditions. In the experiment, the diameter 25mm filling balls were made of slurry of Jinshandian tailings and cement, the cement tailing ratio was 1:4, the concentration of slurry was respectively 68%, 70%, 72%, 75%, and the falling strength, the compressive strength, the powder ratio about the filling balls were tested. The results showed that the falling strength was more than 50 times/A; the compressive strength was 5.23~21.12MPa; the powder ratio was 0.69%~10.52%. The results of the PFC2D numerical simulation showed that the maximum stress among the filling balls was 3.39MPa during the ore drawing process. The stress was lower than the minimum compressive strength of 5.23MPa, and the corresponding powder ratio was less than 8%. It has been concluded that the filling-body is able to meet the requirement of the strength and the powder ratio in the mine filling. The filling-body can be applied to backfilling subsidence area.

Experimental Study on Alkali Stimulating-Steel Slag Cementitious Materials

2011 ◽  
Vol 261-263 ◽  
pp. 551-554
Author(s):  
Gong Xun Wang ◽  
Kui Jun Xu ◽  
Ming Qiao Zhu
Keyword(s):  
Experimental Study ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Products ◽  
Structure Form ◽  
Alkaline Activator

In order to utilize the waste steel slag effectively, three kinds of alkaline activator such as Na2SO4, Na2SiO3, Na2CO­3 were used to prepare steel slag cementitious material and measure its strength of 28 days and 60 days in the standard wet conditions. Microcosmic structure form of hydration products of cementitious material was analyzed by the test of SEM. The results indicate that: three activators on the strength of steel slag all have certain stimulation effect, and Na2SO4 has the apparent stimulation effect on the strength of steel slag, the analysis and test of SEM also shows that hydration products structure form of steel slag cementitious material added with Na2SO4 is much more than other two activators and is more helpful to improve steel slag strength.

Experimental Study on Preparing Ecological Building Mortar by Using Solid Waste

2013 ◽  
Vol 763 ◽  
pp. 199-202
Author(s):  
Chao Yong Yan ◽  
Zhi Hua Li ◽  
Xiao Min Deng
Keyword(s):  
Adverse Effect ◽  
Experimental Study ◽  
Compressive Strength ◽  
Water Consumption ◽  
Cementitious Materials ◽  
Test Results ◽  
Natural Sand ◽  
Brick Powder ◽  
Different Types ◽  
Ecological Building

This paper presents a kind of ecological building mortar with a compressive strength of M5.0, M7.5 and M10 , which includes waste residue as cementitious materials, and waste brick powder, waste mortar powder reclaimed sand instead of natural sand as aggregate. The test results shows that (1) mortar water consumption increase when recycled sand volume increases, but its water-retaining capacity goes up;(2) when different types of recycled sand are used instead of natural sand for middle and low strength mortar, there is no significant adverse effect on its strength, and the 28d compressive strength can all meet the designed strength requirements; (3) Little difference exists among the influence of different recycled sand on properties of mortar.

scholarly journals Characterization and Hydration Mechanism of Ammonia Soda Residue and Portland Cement Composite Cementitious Material

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4794
Author(s):  
Dong Xu ◽  
Pingfeng Fu ◽  
Wen Ni ◽  
Qunhui Wang ◽  
Keqing Li
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Setting Time ◽  
Cement Composite ◽  
Cementitious Materials ◽  
Heat Of Hydration ◽  
Cementitious Material ◽  
Cement Industry ◽  
Hexagonal Plate ◽  
Hydration Mechanism

The use of ammonia soda residue (ASR) to prepare building materials is an effective way to dispose of ASR on a large scale, but this process suffers from a lack of data and theoretical basis. In this paper, a composite cementitious material was prepared using ASR and cement, and the hydration mechanism of cementitious materials with 5%, 10%, and 20% ASR was studied. The XRD and SEM results showed that the main hydration products of ASR-cement composite cementitious materials were an amorphous C-S-H gel, hexagonal plate-like Ca(OH)2 (CH), and regular hexagonal plate-like Friedel’s salt (FS). The addition of ASR increased the heat of hydration of the cementitious material, which increased upon increasing the ASR content. The addition of ASR also reduced the cumulative pore volume of the hardened paste, which displayed the optimal pore structure when the ASR content was 5%. In addition, ASR shortened the setting time compared with the cement group, and the final setting times of the pastes with 5%, 10%, and 20% ASR were 30 min, 45 min, and 70 min shorter, respectively. When the ASR content did not exceed 10%, the 3-day compressive strength of the mortar was significantly improved, but the 28-day compressive strength was worse. Finally, the hydration mechanism and potential applications of the cementitious material are discussed. The results of this paper promote the use of ASR in building materials to reduce CO2 emissions in the cement industry.

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