scholarly journals Non-autoclaved aerated concrete made of modified binding composition containing supplementary cementitious materials

2014 ◽  
Vol 13 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Oksana Poznyak ◽  
Andryy Melnyk
Keyword(s):  
Compressive Strength ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Supplementary Cementitious Materials ◽  
Polypropylene Fibers ◽  
Supplementary Cementitious Material ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
The Impact ◽  
Salt Waste

In this paper the impact of carbonate-containing and sulfate components, zeolite, polypropylene fibers on the properties of modified binding composition and non-autoclaved aerated concrete based on them is investigated. The aerated concrete based on the modified binding composition containing a supplementary cementitious material, that of carbonate-containing salt waste, reinforced with polypropylene fibers is characterized by the compressive strength of 2.7 MPa with the density of 650 kg/m3. The thickness of partitions between pores is 0.16 – 0.21 mm, and the number of pores with the size 0.2-1.0 mm is 76.4%.

scholarly journals Static Hardness Testing of Cement Mortars Containing Different Types of Recycled Construction Waste Powders

Solids ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 331-340
Author(s):  
Zoltán Gyurkó ◽  
Rita Nemes
Keyword(s):  
Compressive Strength ◽  
Indentation Test ◽  
Hardness Test ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Test Results ◽  
Depth Sensing ◽  
Static Hardness ◽  
Cement Mortars ◽  
Aerated Concrete

The present paper deals with the hardness of cement mortars prepared with recycled materials that are potential supplementary cementitious materials (SCM). Two potential SCMs (aerated concrete powder (ACP) and concrete powder) were investigated and compared with a reference (neat cement) sample and a sample containing metakaolin (MK). The long-term performance of the mortars was studied up to the age of one year. Based on the compressive strength tests at different ages, neither concrete powder nor ACP significantly decreases the compressive strength at a 10% substitution ratio. The samples were studied with two types of static hardness tests: the Brinell hardness test and the depth sensing indentation test at two different load levels. The hardness test results indicated that the standard deviation of the results is lower at a higher load level. In the case of metakaolin and concrete powder, the change in the compressive strength was observable in the hardness test results. However, in case of the ACP, the compressive strength decreased, while the hardness increased, which can be traced back to the filler effect of aerated concrete powder. Finally, using the DSI test, the hardness results were analyzed on an energy basis. The analysis highlighted that the change in the hardness is connected to the elastic indentation energy, while it is independent from the dissipated (plastic) indentation energy.

EFFECT OF ACCELERATED CURING ON ABRASION OF HIGH VOLUME SUPPLEMENTARY CEMENTITIOUS MATERIAL SELF CONSOLIDATING CONCRETE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Hayder H. Alghazali ◽  
John J. Myers
Keyword(s):  
Prestressed Concrete ◽  
Abrasion Resistance ◽  
High Volume ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Supplementary Cementitious Materials ◽  
Supplementary Cementitious Material ◽  
Self Consolidating Concrete ◽  
Accelerated Curing ◽  
Precast Prestressed Concrete

Sustainability of precast/prestressed concrete plant can be promoted by using supplementary cementitious material and that significantly reduces the embodied energy of precast/ prestressed concrete products. Usually, up to 25% of the cement can be replaced with supplementary cementitious materials (SCM). Increasing the level of replacement to exceed 25% is considered to be High-Volume SCM. Appropriate testing should be conducted to ensure desired performance of the concrete. This context reports the results of an experimental investigation of effect of accelerated curing on abrasion resistance of High Volume Supplementary Cementitious Material – Self Consolidating Concrete (HVSCM-SCC). Different mixes proportion with supplementary cementitious materials such as Fly Ash, Micro Silica, and lime (Up to 75% of cement replacement) were tested. Rheological properties of the HVSCM-SCC were measured. Mechanical properties at different ages 1, 3, 7, 28, 56, and 90 days were monitored. To investigate the abrasion resistance, 12 x 12 x 3.5 in specimens at age of 28, 56, and 90 days were conducted. The results of abrasion resistance of HVSCM-SCC were compared to the same mixes cured in the moist room. The result showed that the accelerated curing has a significant influence on abrasion resistance of concrete at early ages.

scholarly journals Detoxified Spent Pot Lining from Aluminum Production as (Alumino-)Silicate Source for Composite Cement and AutoClaved Aerated Concrete

2021 ◽  
Vol 11 (8) ◽  
pp. 3715
Author(s):  
Arne Peys ◽  
Mateja Košir ◽  
Ruben Snellings ◽  
Ana Mladenovič ◽  
Liesbeth Horckmans
Keyword(s):  
Fly Ash ◽  
Chemical Reactivity ◽  
Coal Fly Ash ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Aluminum Production ◽  
Strength Development ◽  
Autoclaved Aerated Concrete ◽  
Concrete Blocks ◽  
Aerated Concrete

New sources of supplementary cementitious materials (SCMs) are needed to meet the future demand. A potential new source of SCM is spent pot lining, a residue from aluminum production. The present work showed that the refined aluminosilicate part of spent pot lining (SPL) has a moderate chemical reactivity in a cementitious system measured in the R3 calorimetry test, comparable to commercially used coal fly ash. The reaction of SPL led to the consumption of Ca(OH)2 in a cement paste beyond 7 days after mixing. At 28 and 90 days a significant contribution to strength development was therefore observed, reaching a relative strength, which is similar to composite cements with coal fly ash. At early age a retardation of the cement hydration is caused by the SPL, which should most likely be associated with the presence of trace amounts of NH3. The spent pot lining is also investigated as silica source for autoclaved aerated concrete blocks. The replacement of quartz by spent pot lining did not show an adverse effect on the strength-density relation of the lightweight blocks up to 50 wt% quartz substitution. Overall, spent pot lining can be used in small replacement volumes (30 wt%) as SCM or as replacement of quartz (50 wt%) in autoclaved aerated concrete blocks.

scholarly journals Copper Slag Blended Cement: An Environmental Sustainable Approach for Cement Industry in India

2016 ◽  
Vol 11 (1) ◽  
pp. 186-196
Author(s):  
Jagmeet Singh ◽  
Jaspal Singh ◽  
Manpreet Kaur
Keyword(s):  
Blended Cement ◽  
Copper Slag ◽  
Cementitious Materials ◽  
Strength Test ◽  
Cementitious Material ◽  
Cement Industry ◽  
Supplementary Cementitious Materials ◽  
Material Strength ◽  
Test Results ◽  
Supplementary Cementitious Material

Indian cement industry is facing environmental issue of emission of carbon dioxide (CO2), a greenhouse gas. Blended cements including supplementary cementitious materials are substitute of Portland cement to reduce CO2 emission. The present paper investigates theappropriateness of copper slag (CS) as supplementary cementitious material. Strength properties and hydration of mixes were determined at different replacement levels of CS with cement. Compressive, flexural and tensile strength of each mix was found out at different curing periods. The hydration of cement was investigated through X-ray diffraction (XRD). The strength test results showed that substitution of up to 20% of CS can significantly replace Portland cement.XRD test results were corresponding to strength test results. The present study encourages the utilization of CS as supplementary cementitious material to make economical and environmentally sustainable blended cement

Tentative Optimum Proportion of Supplementary Cementitious Materials in Blended Cement to Perform Better under Tannery Wastewater

2018 ◽  
Vol 937 ◽  
pp. 107-113
Author(s):  
Samina Samrose ◽  
Saifa Anzum ◽  
Samira Mahmud ◽  
Tanvir Manzur
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Blended Cement ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Effluent Treatment ◽  
Tannery Wastewater ◽  
Wastewater Sample ◽  
Supplementary Cementitious Material ◽  
Optimum Proportion

The present research studies the compressive strength of cement mortar cubes prepared from different proportions of supplementary cementitious materials (Fly Ash and Slag) in blended cement. This research aims to find the tentative optimum composition of supplementary cementitious material that shows better performance under tannery wastewater condition, such as that in effluent treatment plants. Synthetic tannery wastewater was simulated in laboratory after collecting wastewater sample from local tannery industry. Eight types of cement compositions (varying supplementary materials proportions) have been chosen. Compressive strength test has been conducted on mortar cubes over a period of three months. Test results revealed that slag addition had shown significantly stronger effects than that of fly ash addition. Also, the combined effect of fly ash and slag and their order of variation on strength were studied. The observations made from this research will be helpful for selection of blended cement proportions in future structures exposed to similar severe conditions.

scholarly journals A Review of the Use of Corncob Ash as a Supplementary Cementitious Material

2017 ◽  
Vol 2 (8) ◽  
pp. 1 ◽  
Author(s):  
Ash Ahmed ◽  
John Kamau
Keyword(s):  
Laboratory Experiments ◽  
Chemical Resistance ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Supplementary Cementitious Materials ◽  
Hardened Concrete ◽  
Corn Cob ◽  
Validity And Reliability ◽  
Supplementary Cementitious Material ◽  
Process Heating

It has been argued that cement is the most energy intensive and expensive material in concrete. It has also been suggested that energy efficiency could be achieved by using Supplementary Cementitious Materials (SCMs), which require less process heating and emit fewer levels of CO2. This paper reviewed studies from different authors on the possibility of using Corn Cob Ash (CCA) as a SCM. The review targeted studies that had applied the quantitative method, with validity and reliability based on empirical data from laboratory experiments. The review covered workability, density, compressive and tensile strengths, gain in strength over time, water absorption and chemical resistance of CCA-replaced concrete. From the findings, it can be concluded that CCA could be used as an effective SCM to replace cement in concrete, with the benefit of a reduction in CO2 emissions that are associated with the production of cement and a mitigation on environmental nuisance that is attributed to the throwing away of corncobs and CCA in landfill, while at the same time improving the properties of wet and hardened concrete.

scholarly journals Using Calcined Marls as Non-Common Supplementary Cementitious Materials—A Critical Review

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 517
Author(s):  
Abdelmoujib Bahhou ◽  
Yassine Taha ◽  
Yassine El Khessaimi ◽  
Rachid Hakkou ◽  
Arezki Tagnit-Hamou ◽  
...  
Keyword(s):  
Cementitious Materials ◽  
Cementitious Material ◽  
Supplementary Cementitious Materials ◽  
Chemical Parameters ◽  
Major Research ◽  
Supplementary Cementitious Material ◽  
Physical And Chemical Parameters ◽  
Influencing Parameters ◽  
Physical And Chemical

This review summarizes the major research and scientific findings on the relevance of using calcined marl as supplementary cementitious material in developing eco-friendly cement for the next generation. Incorporation of calcined marl into cement can result in changes in the properties of these binders, and thus compatibility with other additions could be potential challenging, particularly at higher replacement ratios. From the reviewed literature, a detailed investigation on the characterization of calcined marls, activation methods, influencing parameters, along with studies on the hydration and microstructure was discussed, the overall objective aimed at coming up with the optimal physical and chemical parameters to generate highly reactive marl.

scholarly journals Use of Treated Non-Ferrous Metallurgical Slags as Supplementary Cementitious Materials in Cementitious Mixtures

2021 ◽  
Vol 11 (9) ◽  
pp. 4028
Author(s):  
Asghar Gholizadeh Vayghan ◽  
Liesbeth Horckmans ◽  
Ruben Snellings ◽  
Arne Peys ◽  
Priscilla Teck ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Partial Replacement ◽  
Strength Development ◽  
Supplementary Cementitious Material ◽  
Performance Requirements ◽  
Metallurgical Slags ◽  
Leaching Behaviour ◽  
Kinetics Of

This research investigated the possibility of using metallurgical slags from the copper and lead industries as partial replacement for cement. The studied slags were fayalitic, having a mainly ferro-silicate composition with minor contents of Al2O3 and CaO. The slags were treated at 1200–1300 °C (to reduce the heavy metal content) and then granulated in water to promote the formation of reactive phases. A full hydration study was carried out to assess the kinetics of reactions, the phases formed during hydration, the reactivity of the slags and their strength activity as supplementary cementitious material (SCM). The batch-leaching behaviour of cementitious mixtures incorporating treated slags was also investigated. The results showed that all three slags have satisfactory leaching behaviour and similar performance in terms of reactivity and contribution to the strength development. All slags were found to have mediocre reactivity and contribution to strength, especially at early ages. Nonetheless, they passed the minimum mechanical performance requirements and were found to qualify for use in cement.

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