Low-Alite Portland Cement in Steam-Curing Condition: Long-Term Compressive Strength and Permeability

2022 ◽  
Vol 34 (2) ◽  
Author(s):  
Xiao Huang ◽  
Lu Yang ◽  
Fazhou Wang ◽  
Shuguang Hu
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Steam Curing ◽  
Curing Condition

Strength of Portland Cement with Several Composition of Bottom Ash in Different Fineness with Curing Time of 28 Days

2016 ◽  
Vol 857 ◽  
pp. 311-313
Author(s):  
Ng Hooi Jun ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Soo Jin Tan ◽  
Mohd Firdaus Omar ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Portland Cement ◽  
Environmental Effects ◽  
Coal Combustion ◽  
Cement Mortar ◽  
Bottom Ash ◽  
Curing Time ◽  
Cement Replacement

Concrete is produced increasingly worldwide and accounting 10-20% emission of carbon dioxide. The potential long term opposing cost of environmental effects need to recognize. Residue of coal combustion ashes especially bottom ash will use to develop reuse application. This study focused on compressive strength of several composition of bottom ash as cement replacement in mortar. Curing of cement mortar techniques and duration also plays an important role and effects on the strength. The objective of this research is to examine the compressive strength of bottom ash in Portland cement under various compositions and fineness of bottom ash.

Test Research on Preparation of New Wall Material with Iron Tailings in Tangshan Area

2011 ◽  
Vol 295-297 ◽  
pp. 535-538
Author(s):  
De Qing Gan ◽  
Chao Chen ◽  
Jin Xia Zhang
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Fly Ash ◽  
Wall Material ◽  
X Ray Diffraction ◽  
Steam Curing ◽  
X Ray ◽  
A New Technique ◽  
Scanning Electron

This paper discussed the experimental resuhs of exploiting brick materials with iron tailing materials in Tanshang area. Through preparation of iron tailing bricks, the technical flow and production proportion was obtained. The results show that a burning-and steam curing-free brick product with a compressive strength of 28.30 MPa and Flexural strength of 5.63 MPa as the following: iron tailing; fly ash; sand; CaO; gypsum; cement. And long-term properties of a burning-and steam curing-flee brick is also studied by experiments in this paper. Put forward a new technique of making materials with iron tailing. At the same time, the micro mechanism of iron tailing brick was also studied with X-Ray Diffraction (XRD) and Scanning Electron Microscope(SEM).

scholarly journals STABILIZATION OF CLAY POWDER WITH MINERAL WOOL FLY ASH

2020 ◽  
Vol 11 (4) ◽  
pp. 106-113
Author(s):  
Mindaugas Zakarka ◽  
Rimantas Mackevičius ◽  
Šarūnas Skuodis ◽  
Danutė Sližytė ◽  
Andrius Kudžma
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Clay Soil ◽  
Research Work ◽  
Mineral Wool ◽  
Soil Samples ◽  
Short Term ◽  
Optimal Ratio

The aim of this article – to determine short term and long term strengthening of clay soil, by strengthening it with fly ash obtained during the production of mineral wool. This article introduces research which is used to determine the optimal ratio of fly ash in cement suspension for strengthening of clay soil. Samples which were investigated in this research work prepared by mixing Portland cement, mineral wool fly ash, clay powder, sand and water. All investigated samples compressive strength after 6 months exceeded 1.7 MPa. It is enough of such strength in geotechnics to conduct strengthening of soil and it is possible to argue that soil is strengthened.

scholarly journals Brittleness of Concrete under Different Curing Conditions

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7865
Author(s):  
Shuai Zhang ◽  
Bing Han ◽  
Huibing Xie ◽  
Mingzhe An ◽  
Shengxu Lyu
Keyword(s):  
Fracture Toughness ◽  
Concrete Beams ◽  
Strain Energy Release ◽  
Crack Tip Opening Displacement ◽  
Steam Curing ◽  
Opening Displacement ◽  
Critical Crack ◽  
Curing Conditions ◽  
Curing Condition

In order to shorten construction periods, concrete is often cured using steam and is loaded at an early age. This changes the performance and even the durability of the concrete compared to concrete that has been cured under normal conditions. Thus, the pattern and the mechanism of concrete performance change under different curing conditions, and loading ages are of great significance. The development of brittleness under different curing conditions and loading ages was studied. The evaluation methods that were used to determine concrete brittleness were expounded. Steam, standard, and natural curing conditions were carried out on single-side notched concrete beams as well as on a concrete prism and cubic blocks. The compressive strength and splitting tensile strength of the concrete blocks along with the fracture performance of the concrete beams were tested after 3, 7, 28, and 90 days. The steam curing condition significantly improved the strength of concrete before 28 days had passed, and the standard curing condition improved the strength of concrete after 28 days. Based on the experimental fracture parameters, a two-parameter fracture model was applied to study the development of fracture toughness KICS, critical crack tip opening displacement CTODc, and critical strain energy release rate GICS with hydration age under different curing conditions. With respect to long-term performance, the standard curing condition was better at resisting concrete crack propagations than the steam curing condition was. The characteristic length lch and the material length Q under the three curing conditions and the long-term development of brittleness in the concrete indicated that steam curing increased the concrete brittleness. Considering the effects of the curing condition and the loading age, a time-dependent concrete fracture toughness model was established, and the predicted value of the model was verified against the measured value. The results indicated that the model was able to accurately predict the fracture toughness with an error rate of less than 16%.

The Preparation and Micro Mechanism of Brick Materials with Iron Tailings in Tanshang Area

2013 ◽  
Vol 753-755 ◽  
pp. 572-575
Author(s):  
Shu Xian Liu ◽  
Shao Bo Wei
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Fly Ash ◽  
Flexural Strength ◽  
Scanning Electron Microscope ◽  
Steam Curing ◽  
X Ray ◽  
A New Technique ◽  
Scanning Electron

This paper discussed the experimental results of exploiting brick materials with iron tailing materials in Tanshang area. Through preparation of iron tailing bricks, the technical flow and production proportion was obtained. The results show that a burning-and steam curing-free brick product with a compressive strength of 28.30 MPa and Flexural strength of 5.63 MPa as the following: iron tailing; fly ash; sand; CaO; gypsum; cement. And long-term properties of a burning-and steam curing-free brick is also studied by experiments in this paper. Put forward a new technique of making materials with iron tailing. At the same time, the micro mechanism of iron tailing brick was also studied with X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM).

Silica Sand Powder Mixed with Slag Powder Complex Technology Used for PHC Piles Production

2014 ◽  
Vol 584-586 ◽  
pp. 1432-1439
Author(s):  
Yuan Hai Jiang
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Silica Sand ◽  
National Standard ◽  
Test Results ◽  
Steam Curing ◽  
Slag Powder ◽  
Concrete Admixtures ◽  
Complex Technology ◽  
Compressive Strength Of Concrete

Design concrete mix used in the PHC pile production, silica sand powder and slag powder as a concrete admixture, replace a certain percentage of Portland cement, under the premise of meeting the PHC pile production requirements. After the steam curing, determinate the demould strength of concrete and after autoclave curing, determinatie the compressive strength of concrete. Test results show that it is feasible for the use of silica sand powder and slag powder instead of Portland cement , in which the proportion of concrete admixtures up to 45%. Silica powder and the amount of slag powder were mixed with 150 kg/m3, 50 kg/m3, the concrete demould strength up to 49.1 MPa and the compressive strength after autoclave up to 89.0MPa, to achieve requirements of the national standard GB13476 .

Mechanical Properties of Cementitious and Non-Cementitious System After Ageing Tests for Well Abandonment Cementing Operations

2019 ◽  
Author(s):  
Ingrid Ezechiello da Silva ◽  
Vivian Karla Castelo Branco Louback Machado Balthar ◽  
Romildo Dias Toledo Filho ◽  
Gabriella de Medeiros de Sá Cavalcante ◽  
Robert Lucian de Lima dos Santos
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Portland Cement ◽  
Epoxy Resin ◽  
Modulus Of Elasticity ◽  
Thermal Bath ◽  
Strength Tests ◽  
Well Abandonment

The plug and Abandonment (P&A) are the final stage of the life cycle of an oil well. This implies that the plugging material must withstand the chemicals, temperature and well pressure to ensure its long-term integrity. Portland cement is the most used material as a safety barrier in P&A operations. However, the extreme conditions of the well have challenged the mechanical properties of Portland Cement. In this context, the present work aims to identify the adequate systems as permanent plugging material and to characterize them with a qualification process based on international references and experimental validation. Hence, four systems were tested for plug cementing operation with composition variations under pre-defined ageing conditions. Class G Portland cement slurry was used as reference to allow comparison of mechanical properties (compressive strength and tensile strength) between flexible cement paste, a system containing a mixture of Class G Portland Cement with epoxy resin and finally a system with epoxy resin only. Samples containing Class G Portland Cement were cured for 14 days under well bottom conditions (3000 psi and temperature of 174 degrees Fahrenheit) and cured for 14 days at well temperature (using a thermal bath). Samples containing resin were cured for 14 days under well bottom conditions (3000 psi and temperature of 150 degrees Fahrenheit) and cured for 14 days at well temperature (using a thermal bath). Finally, the samples were aged for 60 days in a thermal bath at well temperature and exposed to the brine which is the completion fluid composition which will be above and below in contact with the well barrier in a P & A operation. The results of the compressive strength tests of the samples aged in brine showed tha in some systems tested the reduction of the modulus of elasticity occurred, however, it was also observed the increase of the modulus of elasticity in another system. The same was true of the results of tensile strength tests of aged samples, the increase of rupture loading in some systems and reduction in the other ones were observed. The mechanical tests of the samples before and after ageing were performed to define the best system to be used in a well abandonment operation aiming for long-term integrity.

Concrete Admixtures in the PHC Pile Production

2012 ◽  
Vol 174-177 ◽  
pp. 1410-1414
Author(s):  
Yuan Hai Jiang
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Silica Sand ◽  
National Standard ◽  
Test Results ◽  
Steam Curing ◽  
Slag Powder ◽  
Concrete Admixtures ◽  
Autoclave Curing ◽  
Compressive Strength Of Concrete

Design concrete mix used in the PHC pile production, silica sand powder and slag powder as a concrete admixture, replace a certain percentage of Portland cement, under the premise of meeting the PHC pile production requirements. After the steam curing, determinate the demould strength of concrete and after autoclave curing, determinate the compressive strength of concrete. Test results show that it is feasible for the use of silica sand powder and slag powder instead of Portland cement, in which the proportion of concrete admixtures up to 45%. Silica sand powder and the amount of slag powder were mixed with 150 kg/m3, 50 kg/m3, the concrete demould strength up to 49.1 MPa and the compressive strength after autoclave curing up to 89.0MPa, to achieve requirements of the national standard GB13476.

Effect of Curing System on Mechanical Property of Slag-Based Geopolymer

2011 ◽  
Vol 250-253 ◽  
pp. 3372-3376 ◽  
Author(s):  
Qing Wang ◽  
Xin Tu ◽  
Zhao Yang Ding ◽  
Zhi Tong Sui
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Compressive Strength ◽  
Portland Cement ◽  
Curing Temperature ◽  
Early Age ◽  
Curing Time ◽  
Commercial Applications ◽  
The Ideal

Geopolymer has been gradually attracting world attention as a potentially revolutionary material that is one of the ideal substitutes of Portland cement, and fundamental studies on geopolymer are increased rapidly because of its potential commercial applications. However, little work has been done in the field of curing system of geopolymer. In this paper, influence of curing temperature, curing time and curing humidity on the mechanical properties of slag-based geopolymer was studied by using the compressive strength as benchmark parameter. Results have shown that the early age compressive strength of geopolymer increased and the long-term compressive strength decreased at first and then increased as the curing temperature increased, 80°C was the best curing temperature. With prolonging the curing time, it was found that the compressive strength of early age of geopolymer reached the maximum ( 116.3 MPa for 1d, 97.5 MPa for 3d) as the curing time was 12h, and that of 28d geopolymer was 91.3 MPa as the curing time was 10h. It was also found that the compressive strength of geopolymer reduced evidently as the humidity increased.

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