Carbonate Steelmaking Slag to Manufacture Building Materials

2009 ◽  
Vol 79-82 ◽  
pp. 1943-1946 ◽  
Author(s):  
Hao Ze Wu ◽  
Jun Chang ◽  
Zheng Zhao Pan ◽  
Xin Cheng
Keyword(s):  
Compressive Strength ◽  
Reaction Time ◽  
Moisture Content ◽  
Greenhouse Gas ◽  
Reaction Temperature ◽  
Building Materials ◽  
New Technology ◽  
Steelmaking Slag ◽  
Curing Time ◽  
Accelerated Carbonation

Accelerated carbonation is a new technology of materials preparation, which may have potential for the treatment of industrial solid residues and the sequestration of CO2, an important greenhouse gas. In this study, accelerated carbonation was used to recycle steelmaking slag and sequestrate CO2 to manufacture building materials. The experimental results show that the strength of specimens increases along with the increase of carbonation degree. Moisture content, carbonation temperature and curing time have significant effects on the degree of carbonation, and carbonated specimens have larger weight increase and compressive strength increases under the condition of moisture content 12.6%，reaction time 117 min and reaction temperature 361 K. The SEM and XRD analyses indicate that dogtooth like CaCO3 crystals appear on the surface of carbonated aggregate specimens. Strength and soundness test shows that steelmaking slag building materials have higher strength and eligible soundness after accelerated carbonation.

The Carbon Absorb of Cement-Based Material in the Accelerated Carbonation Test

2014 ◽  
Vol 905 ◽  
pp. 318-321
Author(s):  
Xiao Xiong Zha ◽  
Hai Yang Wang ◽  
Gan Lin Feng
Keyword(s):  
Carbon Dioxide ◽  
Reaction Time ◽  
Calcium Carbonate ◽  
Greenhouse Gas ◽  
Material Property ◽  
Building Materials ◽  
Cement Mortar ◽  
Accelerated Carbonation ◽  
The Way

Carbonation is a common influence of cement-based material. And the accelerated carbonation is used in material property modify. With the reaction in the material when carbonating, the carbon dioxide will be solidifying in the material, in the shape of precipitation of calcium carbonate filled the pore. But the ability of the carbon absorbing is unknown, in this paper, some cement-based building materials are took in test, including the aerated brick, cement tile, concrete, and cement mortar. In according to the results, it has found that the carbon absorbing ability is different, and with the carbon absorbing, the strength also increasing. The aerated brick is greatest and the condition of temperature, pressure and reaction time is lowest, which give a reference on the way of the greenhouse gas transform and reduced.

Influence of Temperature on Carbonation Pellet for Ferrous Dust

2013 ◽  
Vol 690-693 ◽  
pp. 374-377 ◽  
Author(s):  
Yan Shi ◽  
Xiao Jun Li ◽  
Chang Qing Hu
Keyword(s):  
Compressive Strength ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Flow Rate ◽  
Co2 Concentration ◽  
Conversion Ratio ◽  
Carbonation Reaction ◽  
Influence Of Temperature ◽  
Content Ratio ◽  
Influence Of Temperature On

In a certain reaction time, CO2 concentration and flow rate, the carbonation experiment was carried out about green pellets prepared by the ferrous dust and active lime with 15%, 20%, 25%, 30% CaO content ratio respectively. The conversion ratio, porosity and compressive strength of carbonation pellets were analyzed at 200°C, 400°C, 600°C, 800°C.The results show that, with the reaction temperature increasing, CaO conversion ratio of carbonation reaction and the compressive strength increased, and the porosity decreased significantly; when the reaction temperature is 800°C, the CaO conversion ratio of reaction with 25% CaO content pellet can reach 47.26%, these can make the carbonation pellet to achieve a better carbonation degree and quality.

scholarly journals Influence of Nanolime and Curing Period on Unconfined Compressive Strength of Soil

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Panbarasi Govindasamy ◽  
Mohd Raihan Taha ◽  
Jamal Alsharef ◽  
Kowstubaa Ramalingam
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Curing Time ◽  
Strength Gain ◽  
Treated Soil ◽  
Soil Particles ◽  
Curing Period

This paper presents the improvement of the unconfined compressive strength (UCS) of soil by mixing different percentages of nanolime and 5% lime with soil. The UCS of treated soil increased significantly over curing time with increasing percentage of nanolime. The optimum results were reached at only 0.5% nanolime admixtures which were much higher than 5% lime admixture. This may be due to higher ability of nanolime to flocculate and agglomerate the soil particles compared with the lime. In addition, the lime could fill only the micropores while nanolime could fill the micro- and nanopores as well. The strength gain is inversely proportional to the remolded moisture content and curing period. However, when the content of nanolime used is larger than 0.5%, nanolime particles are not uniformly dispersed. Therefore, a weak area in the form of voids is created, consequently the homogeneous hydrated microstructure cannot be formed, and finally the strength will decrease.

Study on the Solidification/Stabilization Treatment of Tannery Sludge

2011 ◽  
Vol 356-360 ◽  
pp. 1951-1954
Author(s):  
Yu Tian ◽  
Xu Nan Ning ◽  
Jing Yong Liu ◽  
Jian Bo Zhou ◽  
Zuo Yi Yang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Moisture Content ◽  
Curing Time ◽  
Tannery Sludge ◽  
Optimum Conditions ◽  
Toxic Heavy Metals ◽  
Stabilization Treatment

Sludge from tannery was solidified and stabilized by using lime, PFA and cinder as the solidifying agents，investigation of solidifying agents affect toxic heavy metals in tannery sludge and the optimum conditions of sludge solidification/stabilization were analyzed. The results showed that under the dosage of lime, PFA and cinder were 0.12kg/kg, 0.02kg/kg and 0.08kg/kg respectively, and curing time was 6 days, the compressive strength of the solidified sludge block reached 884KPa while the moisture content of the solidification block was 30.2%，which met with the standards of landfill. Compared with the untreated tannery sludge，the concentration of Cu、Pb、Zn、Ni and COD of the leaching from the sludge solidification block was reduced by 92.1%、96.7%、92.8%、88.9% and 75.9% respectively，the Cr、Cd、and Mn were undetectable.When lime and PFA ratio was 6:1, the solidified block have good synergistic solidification effects.

Influence of Early Age Wet Curing Time, Clinker and CaO Content on the Carbonation Resistance of C40 Ordinary Concrete

2011 ◽  
Vol 311-313 ◽  
pp. 1894-1900 ◽  
Author(s):  
Qing Ye
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Concrete Cover ◽  
Early Age ◽  
Curing Time ◽  
Accelerated Carbonation ◽  
Carbonation Depth ◽  
Ordinary Concrete ◽  
Carbonation Resistance

Based on accelerated carbonation test, the variation of the carbonation resistance of ordinary concrete (C40 grade) with early age wet curing time, clinker and CaO content was studied. Results indicate that the carbonation coefficient and the accelerated carbonation depth of the concrete increased obviously with a reduction in the wet curing time at early ages, the clinker or CaO content in binder and the compressive strength at 28 d age. For example, in conditions of curing schedules with 28, 7, 3, 2 and 1 d wet curing at 20 °C with above 95% RH at early ages and then 0, 21, 25, 26 and 27 d air curing at 20 °C with 60% RH, respectively, carbonation coefficients of the concrete incorporated with 15% fly-ash and 25% slag were 1.83, 2.71, 3.61, 4.67 and 5.50 mm/a0.5 respectively, and thus it can be seen that the calculated times when concrete cover (25 mm) was completely carbonated naturally in now atmosphere (0.04% CO2) were 191, 104, 52, 31 and 20 years respectively. It is possible to predict the potential carbonation coefficient of the concrete from its clinker or CaO content in binder and from its compressive strength at 28 d age in conditions of the certain wet curing time at early ages.

scholarly journals PENGARUH SUHU REAKSI, KECEPATAN PENGADUKAN DAN WAKTU REAKSI PADA PEMBUATAN SABUN PADAT DARI MINYAK KELAPA (Cocos nucifera L.)

2019 ◽  
Vol 8 (1) ◽  
pp. 11-17
Author(s):  
Rosdanelli Hasibuan ◽  
Fransiska Adventi ◽  
Rahmad Parsaulian Rtg
Keyword(s):  
Reaction Time ◽  
Moisture Content ◽  
Reaction Temperature ◽  
Ph Value ◽  
Cocos Nucifera ◽  
Coconut Oil ◽  
Operating Conditions ◽  
Animal Fats ◽  
Cocos Nucifera L ◽  
Impeller Type

Soap is a cleanser made by chemical reactions between sodium hydroxide or potassium hydroxide with fatty acids from vegetable oils or animal fats. Soaps can be made by several methods, namely saponification and neutralization methods, in this study carried out by saponification method. In the saponification method there are several problems namely operating conditions which include reaction temperature, stirring speed and stirring time. Therefore, need to do research to determine the best conditions of saponification reaction, namely reaction speed, operating temperature and reaction time using an impeller type multiple pitch blade turbine with research variables reaction temperature 60 oC, 70 oC, and 80 oC, stirring speed 300 rpm,400 rpm and 500 rpm and reaction time of 45minutes, 60 minutes, and 75 minutes. Saponification reaction is carried out by heating coconut oil and inserting 30% NaOH slowly and then stirring with a multiple pitch blade stirrer. The product will be analyzed by testing alkaline levels, moisture content and pH of the soap. The best operating conditions obtained from this study were at a temperature of 70 oC, reaction time of 60 minutes, stirring speed of 400 rpm with a pH value of 9.4 and an alkaline level of 0.073 and a moisture content of 9.8.

Pengaruh Klasifikasi Batang Aren dengan Pengawetan Asam Borat Rendaman Panas-Dingin untuk Bahan Bangunan

2016 ◽  
Vol 8 (15) ◽  
pp. 75-83
Author(s):  
Petrus Patandung
Keyword(s):  
Compressive Strength ◽  
Specific Gravity ◽  
Moisture Content ◽  
Boric Acid ◽  
Building Materials ◽  
Test Sample ◽  
Preservation Method ◽  
Materials Research ◽  
Two Phases

Classification Effect of palm trunks with boric acid pickling hot-cold baths for building materials has been carried out. The purpose of this study is to utilize palm trunks that are not productive to Classification of building materials and do preservation for durability and can be used as building materials. Research conducted two phases: the first to determine that the palm trunk Classification length: 1.5, 2 or 3.5, 2.5 or 6 and 3 meters or 9 meters from the base of the palm trunk and Phase II to preserve palm trunks or test sample using boric acid preservative with concentrations: 1, 2, 4, 6 and 8% as well as preservation method with hot-cold baths. The study was repeated 2 (two) times.Results showed treatment of hot-cold baths hard parts, among others; 12.20 -19.88% moisture content, specific gravity value of  0,48-0.68, compressive strength parallel to the fiber 155-280 kg/cm2, the compressive strength perpendicular to the fiber of 100-125 kg/cm2.retention 1,05- 8.00 kg/m3, the penetration from 80.43 to 93.45%, and the soft water content from 14.13 to 20.93%, the value of density 0,27- 0.40. Compressive strength parallel to the fiber 98.5-112 kg/cm2, the compressive strength perpendicular to the fiber 58-108 kg/cm2,the retention of 0.7 to 4.61kg/m3 and penetration 75.88 to81.93%. Best research results obtained in the first test sample with a length of 1.5 meters from the base of a palm trunk  using boric acid preservative 8% ie hot-cold baths because it produces compressive strength parallel to the fiber of the highest type of 0.68 and can meet the standards.ABSTRAKPengaruh klasifikasi batang aren  dengan pengawetan asam borat rendaman panas-dingin untuk bahan bangunan telah dilaksanakan. Tujuan penelitian ini adalah untuk memanfaatkan batang aren yang tidak produktif dengan melakukan klasifikasimenjadi bahan bangunan dan melakukan pengawetan agar tahan lama serta  dapat digunakan sebagai bahan bangunan. Penelitian dilaksanakan 2 tahap yaitu tahap I untuk menentukan klasifikasi batang aren yaitu dengan ukuran panjang:  1,5, 2  atau 3,5, 2,5  atau 6 dan 3 meter atau 9 meter dari dasar batang aren dan Tahap II untuk mengawetkan batang aren atau contoh uji yang  menggunakan bahan pengawet asam borat dengan konsentrasi : 1, 2, 4, 6 dan 8 % serta menggunakan metode pengawetan dengan rendaman panas-dingin. Penelitian diulang 2 (dua) kali. Hasil penelitian menunjukkan perlakuan rendaman panas-dingin bagian keras antara lain; kadar air 12,20 -19,88 %, nilai berat jenis 0,48- 0,68, kuat tekan sejajar serat 155-280 kg/cm2, kuat tekan tegak lurus serat 100-125 kg/cm2, retensi 1,05-8,00 kg/m3, penetrasi 80,43 - 93,45 %, dan bagian lunak kadar air 14,13 - 20,93%, nilai berat jenis 0,27- 0,40, kuat tekan sejajar serat 98,50 -112kg/cm2, kuat tekan tegak lurus serat 58-108 kg/cm2, retensi 0,76-4,61 kg/m3 dan penetrasi 75,88-81,93 %.Hasil penelitian yang terbaik diperoleh pada contoh uji I dengan ukuran panjang 1,5 meter dari dasar batang aren yang  menggunakan bahan pengawet asam borat  8% yaitu rendaman panas-dingin karena menghasilkan kuat tekan sejajar serat yang tertinggi yaitu sebesar 280 kg/cm2, berat jenis 0,68 dan retensi sebesar 8,00 kg/m3 dan dapat memenuhi standar mutu kayu bangunan. Kata Kunci : batang aren, pengawetan, asam borat,kuat tekan,retensi.

INFLUENCE OF CURING CONDITIONS AND ALKALI HYDROXIDE ON STRENGTH OF FLY ASH GEOPOLYMER CONCRETE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Khoa Tan Nguyen ◽  
Tuan Anh Le ◽  
An Thao Huynh ◽  
Namshik Ahn
Keyword(s):  
Compressive Strength ◽  
Sodium Hydroxide ◽  
Carbon Dioxide Emissions ◽  
Building Materials ◽  
Sodium Hydroxide Solution ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Curing Time ◽  
Curing Conditions ◽  
Alkali Hydroxide

Geopolymer concrete is known as an alternative to Portland cement, with low carbon dioxide emissions compared with the conventional building materials. In this research, the influence of curing conditions and alkali hydroxide were investigated, using curing temperatures between 40 to 100℃, curing times from 4 to 12 hours, and various types of hydroxide and concentrations of sodium hydroxide solution. Geopolymerization needs energy and time to occur, and higher curing temperatures resulted in larger compressive strength, while longer curing times resulted in higher compressive strength. At the same curing temperature, longer curing time resulted in a higher compressive strength because the longer curing time extends the chemical reaction. For geopolymer concrete, sodium hydroxide is a better property than potassium hydroxide, because the atomic size of sodium anion is smaller than potassium. Further, the strength of concrete increased when the concentration of sodium hydroxide increased. In conclusion, geopolymer concrete is suitable for traditional building materials. Finding renewable materials to satisfy the increasing demand for building structures will be the primary challenge in future.

Experimental Study on New Technology for Solidifying/Stabilizing Papermaking Sludge

2010 ◽  
Vol 156-157 ◽  
pp. 84-89
Author(s):  
Xu Nan Ning ◽  
Shi Wen Li ◽  
Jing Yong Liu ◽  
Zuo Yi Yang ◽  
Zhu Ying
Keyword(s):  
Mechanical Properties ◽  
Heavy Metals ◽  
Heavy Metal ◽  
Compressive Strength ◽  
New Technology ◽  
Oxygen Demand ◽  
Heavy Metal Concentration ◽  
National Standards ◽  
Curing Time ◽  
Water Ratio

For better harmlessly treatment of papermaking sludge, a new technology for solidifying and stabling of sludge was studied. Papermaking sludge was solidified and stabilized by the solidifying agents including cement, powder fly ash (PFA) and cinder. The mechanical properties of solidified sludge block were evaluated by compressive strength, chemical oxygen demand (COD) and heavy metals concentration in the leachate from the solidified block were tested as well. When the solidifying agents has the following composition (cement 0.12kg/kg, PFA 0.02kg/kg and cinder 0.10kg/kg respectively), and the curing time was 6ds, the compressive strength of the solidified sludge blocks reached 360kPa. The results showed that cement and cinder were all positive in the compressed strength of sludge block. If they were mixed with PFA together, they could enhanced the solidification of organic and heavy metals in the sludge. Under this conditions, the COD in leachate from the solidified block was 115.7 mg/L, and the heavy metal concentration had reached the related national standards, after 6ds of curing time, water ratio of the solidified block kept from 35% to 40%, which met the prescribed standards of landfill.

scholarly journals Measuring Compressive Strength Characteristics of Soil-Dobak-Glue Mixtures over Curing Time

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
Myeonghwan Kim ◽  
Seongjun Eom
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Building Materials ◽  
Standard Specimen ◽  
Dry Density ◽  
Curing Time ◽  
Soil Mixing ◽  
Optimum Water Content ◽  
Significant Difference ◽  
Optimum Water

The building materials used by mankind in the past, such as stone, soil, and wood, have been environment-friendly. However, the various building materials invented over time with the development of the industrial age pose problems such as environmental hormone generation and waste generation/disposal. To overcome these problems, building materials based on soil, a traditional building material, are being developed by researchers. However, the improvement in soil’s structural characteristics is insufficient as it excessively emphasizes efficacy and function only. In this study, lime and Dobak-glue were mixed with soil to solve the structural problems and improve the strength of soil, and water content and change in strength in accordance with curing time were tested. In order to understand the change in strength, a compaction test was performed by preparing a standard specimen based on the optimum water content and maximum dry density. The lime mix required optimum water content and quantity of lime equal to 3% of soil weight, while the Dobak-glue mix was prepared by soil mixing in the same weight ratio as optimum water content. Changes in water content and compressive strength were measured over curing time of 3, 7, and 28 days. Three specimens, lime mixed specimen, Dobak-glue mixed specimen, and standard specimen, were prepared, and their water content and compressive strength values were averaged. Although the change in water content according to the curing period differed depending on the material mixed with soil, there was no significant difference between 7.12% and 2.82% after 7 days. As for the change in compressive strength, the initial compressive strength in lime mixed specimen was excellent, but the Dobak-glue mixed specimen displayed the greatest strength after 7 days. To conclude, Dobak-glue is an eco-friendly material, and it can be very useful in compensating for the structural shortcomings of soil.

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