Experimental Study on Aerated Concrete Produced by Iron Tailings

2011 ◽  
Vol 250-253 ◽  
pp. 853-856 ◽  
Author(s):  
Yu Ze Tian
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Experimental Method ◽  
Concrete Block ◽  
National Standards ◽  
Caustic Alkali ◽  
Iron And Steel ◽  
Mix Proportion ◽  
Optimal Mix ◽  
Aerated Concrete

The non-autoclaved aerated concrete block with greater than 7.5Mpa compressive strength is produced by using iron tailings, lime, aluminum powder, caustic alkali, water, cement and gypsum in the laboratory after the experimental study on the property of iron tailings produced by Anshan Iron and Steel Group. The optimal mix proportion is finally determined by adopting orthogonal experimental method, the evaluating indicator is compressive strength. Aerated concrete block that is made from iron tailing is trial produced according to the national standards, and then its strength is determined by sample examination.

Experimental Study on Producing Concrete Hollow Block with Mining Slag

2011 ◽  
Vol 261-263 ◽  
pp. 820-823 ◽  
Author(s):  
Yu Ze Tian
Keyword(s):  
Experimental Study ◽  
Mine Tailings ◽  
Coarse Aggregate ◽  
National Standards ◽  
Iron And Steel ◽  
Mix Proportion ◽  
Iron Mine ◽  
Sample Test ◽  
Waste Rocks ◽  
Hollow Block

The experiments of compressive strength about maix proportion of concrete are repeatedly done, adopting orthogonal experimental method. In this experiment, dry separation waste rocks and mine tailings in mining slag of Qidashan Iron Mine which is subsidiary company of Anshan Iron and Steel Corporation are used instead of traditional fine and coarse aggregate concretes. Then the optimized mix proportion is determined to make the concrete small hollow blocks. Sample test shows that it is feasible to make load bearing concrete small hollow blocks which can meet national standards.

Study on Production of Autoclaved Aerated Concrete by Coal Gangue Fly Ash

2013 ◽  
Vol 357-360 ◽  
pp. 949-954
Author(s):  
Ye Zhang ◽  
Peng Xuan Duan ◽  
Bao Sheng Jia ◽  
Lei Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Coal Gangue ◽  
National Standards ◽  
Raw Material ◽  
Autoclaved Aerated Concrete ◽  
Binder Ratio ◽  
Material Formulation ◽  
Aerated Concrete

In this paper, the low-silicon coal gangue fly ash is used to produce autoclaved aerated concrete. The influences of water binder ratio, coal gangue fly ash content, calcareous content and conditioning agents on the compressive strength of the autoclaved aerated concrete are investigated. Optimal raw material formulation and procedure are determined for the autoclaved aerated concrete. The compressive strength and frost resistance of autoclaved aerated concrete made by the optimal raw material formulation and procedure meet with the requirements of autoclaved aerated concretes of B05 grade, and its thermal conductivity, drying shrinkage reach the requirements of the relevant national standards of China.

Experimental Study on the Detoxification of Chrome Sludge by Making Bricks

2014 ◽  
Vol 878 ◽  
pp. 708-713 ◽  
Author(s):  
Xiu Lin Yang ◽  
Wei Ye ◽  
Gao Ming Wu ◽  
Wang Sheng Chen ◽  
Jun Han
Keyword(s):  
Experimental Study ◽  
Weight Loss ◽  
Compressive Strength ◽  
Mass Fraction ◽  
Sintering Temperature ◽  
Trivalent Chromium ◽  
National Standards ◽  
Molding Pressure ◽  
Loss On Ignition ◽  
Sintering Time

In order to eliminate the toxicity of chromium sludge, hexavalent chromiumwas changed into trivalent chromium. Chromium sludge, coal and clay were used at the ratio of 0-12%:90-78%:10% to manufacture sludge bricks. Meanwhile, the influences of the sludge mass fraction, molding pressure, sintering temperature and sintering time on weight loss on ignition, chromium leaching concentration, water absorption and compressive strength of bricks were also investigated. The results indicated that the conditions for manufacturing good quality bricks was 8% sludge with 4h of sintering prepared in 20MPa molding pressure and sintered at 950°C, which can reach the national standards (HJ/T 301-2007). Furthermore, wastes were changed into resources and economical benefits were brought to the company.

An Experimental Study on the Mechanical Properties of Cemented Rock-Tailings Fill

2014 ◽  
Vol 941-944 ◽  
pp. 2611-2619
Author(s):  
Li Jie Guo ◽  
Ke Ping Zhou ◽  
Xiao Cong Yang ◽  
Guang Sheng Liu ◽  
Wen Yuan Xu
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mine Waste ◽  
Waste Rock ◽  
Mill Tailings ◽  
Mix Proportion ◽  
Study Results ◽  
Mine Waste Rock ◽  
Materials Used ◽  
Mine Development

This paper outlines an effective approach to making composite backfill using mine waste material. Composite materials are widely used in many areas of engineering because of their unique structural properties. Cemented rock-tailings are one of the most prevalent materials used for composite backfill because they can effectively make use of mine waste rock and mill tailings that would otherwise be simply considered waste. This backfill method has the capability of maintaining the mine environment while still allowing for continued mine development. An experimental study is being conducted in a cooperative mine research project to investigate the properties of backfill material and specifically the mechanical characteristics of cemented waste rock-tailings fill. This study details the characteristics of the composite backfill aggregate with respect to the compressive strength of the cemented rock-tailings fill and the backfill mix-proportion, as well as outlines a new method of study for cemented rock-tailings fill mechanics. The study results show the compressive strength of cemented rock-tailings fill is dependent mainly on the cement and waste rock content. Ensuring a precise backfill mix proportion can effectively reduce the cement dosage, thereby decreasing the backfill cost realized for the mine.

scholarly journals Experimental study on mechanical properties and microstructures of steel fiber-reinforced fly ash-metakaolin geopolymer-recycled concrete

2021 ◽  
Vol 60 (1) ◽  
pp. 578-590
Author(s):  
Zhong Xu ◽  
Zhenpu Huang ◽  
Changjiang Liu ◽  
Xiaowei Deng ◽  
David Hui ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Steel Fiber ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Mix Proportion ◽  
Optimal Mix

Abstract Geopolymer cementitious materials and recycled aggregate are typical representatives of material innovation research in the engineering field. In this study, we experimentally investigated a method to improve the performance of geopolymer-recycled aggregate concrete (GRAC). The recycled concrete aggregates and steel fiber (SF), fly ash (FA), metakaolin (MK), and sodium silicate solution were used as the main raw materials to prepare fiber-reinforced geopolymer-recycled aggregate concrete (FRGRAC). First, the orthogonal test was carried out to study the GRAC, and the optimal mix proportion was found. Second, building on the optimal mix proportion, the effects of the SF content on the slump, 7 and 28 days compressive strength, tensile strength, and flexural strength of FRGRAC were further studied. Finally, the microscopic mechanism of FRGRAC was studied by scanning electron microscopy (SEM). The study results indicate that the slump continues to decrease as the fiber content increases, but the compressive strength, tensile strength, and flexural strength increase to a certain extent. Through SEM analysis, it is found that SF restrains the development of cracks and improves the strength of concrete.

An Experimental Research on Basic Properties of Ceramsite Cellular Concrete

2017 ◽  
Vol 1142 ◽  
pp. 329-333 ◽  
Author(s):  
Yan Gang Zhang ◽  
Yun Xing Shi ◽  
Jing Bin Shi ◽  
Qing Xuan Wang ◽  
Kun Ni ◽  
...  
Keyword(s):  
Quality Control ◽  
Compressive Strength ◽  
Lightweight Aggregate ◽  
National Standards ◽  
Lightweight Aggregate Concrete ◽  
Masonry Structures ◽  
Aggregate Concrete ◽  
Mix Proportion ◽  
Selection Of ◽  
Cellular Concrete

Ceramsite cellular concrete (CCC for short) is a kind of lightweight aggregate concrete. In this paper, the selection of materials and design of mix proportion have been discussed, and basic property tests has been done. The compressive strength was proved up to the National Standards of P. R. GB50003-2001(code for design of masonry structures), furthermore, elastic modulus and Poisson's ratio were also introduced. Questions remain regarding the quality control of the product, and further work is needed to resolve this contradiction.

Experimental Study of Composite High Strength Self-Compacting Concrete

2017 ◽  
Vol 865 ◽  
pp. 289-294
Author(s):  
Xi Ri Kang ◽  
Guang Xiu Fang
Keyword(s):  
Compressive Strength ◽  
Engineering Application ◽  
High Strength ◽  
Cementitious Material ◽  
Self Compacting Concrete ◽  
Design Strength ◽  
Mix Proportion ◽  
Optimal Mix ◽  
Axial Compressive Strength ◽  
Compressive Strength Of Concrete

This test uses polycarboxylate superplasticizer by adding 15% quantitative fly ash, 10%, 15%, 20% of slag, and 5%,7.5%, 10% of silica fume of the total amount of the cementitious material to be an equivalent replacement for cement. Ordinary materials were used to make the C70 high strength self-compacting concrete. The concrete slump, expansion degree, and the axial compressive strength of concrete were studied. Through testing, the mix proportion of each group of concrete slump was determined to be above 250mm. And the expansion degree to be above 550mm. The axial compressive strength satisfied the design strength value. At the same time, the optimal mix ratio was proposed. And the economic performance of each group was analyzed. There are references for a similar experimental design and engineering application.

Effect of Raw Material Ratios on the Compressive Strength of Chang Jiang Iron Ore Gangues Aerated Concrete Block

2012 ◽  
Vol 573-574 ◽  
pp. 92-98
Author(s):  
Wen Hua Xu ◽  
Hao Zhang ◽  
Wei Jun Ren ◽  
Jin Yi Wu
Keyword(s):  
Compressive Strength ◽  
Aluminum Powder ◽  
Quartz Sand ◽  
Iron Ore ◽  
Raw Materials ◽  
Dry Weight ◽  
Concrete Block ◽  
Raw Material ◽  
Optimum Ratio ◽  
Aerated Concrete

The present study was to investigate the production of aerated concrete block from ChangJiang iron ore gangues. Analyze Quartz Sand, cement, CaO and gangue’s ratio’s influence on the aerated concrete block’s compressive strength, and then determine the optimum ratio. The results shows that gangue, quartz sand, cement, CaO, gypsum, aluminum powder, additive’s optimum ratio is 60.11%，8.26%，15.03%, 14.07%, 2%, 0.06% and 0.07% the dry weight of raw materials. Obtain the strongest compressive strength with the ratio 0.59:1 for water and raw materials. Adding iron gangues into aerated concrete block can turn wastes into treasures, which is originally done by us.

scholarly journals Preliminary Study on Hand-cast Lightweight Concrete Block using Raw Rice Husk as Aggregate

2021 ◽  
Vol 933 (1) ◽  
pp. 012005
Author(s):  
S Winarno
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Laboratory Experiments ◽  
Lightweight Concrete ◽  
Concrete Block ◽  
Rice Husks ◽  
Mix Proportion ◽  
Concrete Blocks ◽  
Preliminary Study ◽  
Preliminary Application

Abstract Raw rice husk is an abundantly available waste material in Indonesia as one of rice producing countries. Due to rice husk is light in weight and convex in shape, this paper presents a preliminary application of raw rice husk as natural aggregate in order to make lightweight concrete blocks. Concrete specimens contained Portland Cement, filler, and raw rice husk, in which the mix proportion was in volumetric ratio, i.e 1.25 cement and 2.75 filler constantly, whereas dosage of rice husk varied from 8.5 to 10. The production of the concrete block was by mixing the ingredients together and then the mixture was casted and compacted on moulds by hand manually. Series laboratory experiments were accomplished to analyse the compressive strength and density. For this, four groups of mixes were prepared. The results have shown that the higher proportion of rice husk is the lower its compressive strength and the lighter its density. At proportion of 1,25 cement: 2,75 fillers: 8,5 raw rice husks, the compressive strength is 26.64 kg/cm2 and this satisfies the minimum standard (25 kg/cm2). Unfortunately, the density is 1,536.73 kg/m3 and it is higher than the maximum standard of 1,400 kg/m3. Thus, it is important to research further by making and testing some improved specimens with more cement, more rice husk, and less filler to fulfil strength and density.

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