Effects of ordinary Portland cement on the early properties and hydration of calcium sulfoaluminate cement

Zhang, Junjie; Li, Guoxin; Ye, Wenting; Chang, Yuzhen; Liu, Qingfeng; Song, Zhanping

doi:10.1016/j.conbuildmat.2018.08.008

Cited by 105 publications

(36 citation statements)

References 39 publications

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“…The content of AFt in specimens was calculated by Equation (6) and the results are listed in Table 6 [ 36 ].

where M 50 and M 150 are the mass loss of specimens at temperatures of 50 °C and 150 °C; M total is the total initial of specimens.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the initial concentration of calcium ions in CSA paste was also increased and this also contributed to the ettringite formation. Due to the rapid ettringite formation, a dense crystal skeleton was formed, which led to fast setting and high early strength [ 36 ]. Moreover, it was noted that, in the presence of WGCS, needle-shaped AFt was formed and it seemed likely that this form of AFt compacted the microstructure, which, in turn, resulted in the early strength development.…”

Section: Resultsmentioning

confidence: 99%

“…Obviously, it was more likely that the needle-shaped ettringites would be interlocked together [ 35 ], leading to fast setting and a compact microstructure. It was reported that 3% calcium oxide improved the initial pH value of CSA from 10.8 to 11.6 and increased the content of AFt from 14.69% to 27.14% at the age of 2 h [ 36 ]. It was also demonstrated that the needle-shaped AFt could be easily formed in a CSA–PC–calcium aluminate cement ternary binder because of the presence of free lime in PC, offering a relatively high pH value [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

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In this study, wet-ground carbide slag (i.e., WGCS) was utilized as an accelerator in calcium sulfoaluminate cement (CSA) for obtaining considerably faster setting processes for some special engineering processes such as plugging projects and rapid repair engineering. The WGCS–CSA system was designed, in which the replacement ratio of CSA by carbide slag was chosen as 4%, 8% and 12%. The setting time and compressive strength were measured, and the mechanism of the system hydration was studied in detail by means of calorimetry, XRD, thermogravimetry (TG) and SEM. The results showed that WGCS shortened the setting time of cement and significantly augmented the early strength. The addition of 8% of WGCS contributed to increasing the 2-h compressive strength from 4.2 MPa to 32.9 MPa. The decrease in the setting time and the increase in the initial strength were mainly attributed to the high initial pH value of the liquid phase and the high content of calcium ions in WGCS. Both these factors contributed to the ettringite formation and, at the same time, to the transformation of the morphology at a later time. Such results testify that WGCS can be used as an accelerator in the CSA system and also that it provides a novel approach to the reutilization of carbide slag.

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“…The content of AFt in specimens was calculated by Equation (6) and the results are listed in Table 6 [ 36 ].

where M 50 and M 150 are the mass loss of specimens at temperatures of 50 °C and 150 °C; M total is the total initial of specimens.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

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“…This exposure time was found to be adequate for the complete dehydration of the important mineral ingredients for the SAC: the AFt (ettringite) and Al(OH) 3 solid crystal which make up 40 -70 wt. % and are the most abundant and the most important minerals that make the cement and assure the bonding with different aggregates [10,11,12] as well as other related dehydration reactions and other thermally induced physical changes [13,14]. Each sample was allowed to cool down for seven days for observing the capacity of the different cements (SAC and OPC) to recover the strength lost after being exposure to 100 °C, 200 °C and 300 °C.…”

Section: Experimental Set-up and Test Programmementioning

confidence: 99%

Strengths of Sulfoaluminate Cement Concrete and Ordinary Portland Cement Concrete After Exposure to High Temperatures

Tchekwagep¹

2020

Ceramics - Silikaty

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The use of SAC (sulfoaluminate cement) has been increasing in the constructions of diverse buildings with some close to reactors, which are often exposed to high temperatures in China. This study compares the flexural strength, compressive strength, crack load, mass weight loss, porosity, and flexural stress--strain of the sulfoaluminate cement concrete (SACC) to that of ordinary Portland cement concrete (OPCC) after both are exposed to high temperatures. The results show that the samples of SACC show a rapid decrease in the flexural strength, crack load, and compressive strength after heating, and, thus, cannot be repaired, but should be demolished. Samples made with OPCC can be repaired because the structural integrity remains acceptable after heating. 56 % SACC is < half of its initial strength after heating to 200 °C while OPCC remains at > 90 % of its compressive strength after heating at 200 °C, and retains 80 % of its compressive strength when heated to 300 °C. SACC initially had a higher flexural strength and consequently a higher crack load; therefore, it performed better than the OPCC in terms of the load carrying capacity of the structure. Also, the OPCC had a constant decrease in the strength, compared to the SACC which did not. However, the OPCC has a better resilience strength rating as the temperatures increase than the SACC one because testing revealed a very rapid decrease in the strength after exposure to 100 °C, 200 °C, and 300 °C. The results agree on the better firm structure uniformity and density of the SACC at an ambient temperature (20 °C) compared to the OPCC. The severe deterioration (micro-crack) inside both concretes, revealed by the longer transmitting time and the small amplitude values of the waves, indicated the effective negative impact which is no longer demonstrated when the extreme temperature has a larger effect on the concrete made with SAC, therefore, the other results highlighted the rapid decrease in the strength of the SACC compared to that of the OPCC.

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“…Sulphoaluminate cement (SAC) exhibits fast setting and high early strength to support efficient and rapid construction; thus, SAC is advantageous to be utilized in 3D printing applications [33,34,35,36]. In comparison to ordinary Portland cement, SAC also offers several advantages, such as relatively low energy consumption and carbon dioxide emission, excellent durability, and resistance to freezing-thawing [37,38,39,40,41].…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study on HPMC-Improved Sulphoaluminate Cement for 3D Printing

et al. 2018

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A novel 3D printing material based on hydroxypropyl methylcellulose (HPMC)—improved sulphoaluminate cement (SAC) for rapid 3D construction printing application is reported. The hydration heat, setting time, fluidity of paste and mortar, shape retainability, and compressive strength of extruded SAC mortar were investigated. HPMC dosage, water-to-cement (W/C) ratio, and sand-to-cement (S/C) ratio were studied as the experimental parameters. Hydration heat results reveal HPMC could delay the hydration of SAC. The initial and final setting time measured using Vicat needle would be shortened in the case of W/C ratio of 0.3 and 0.35 with HPMC dosage from 0.5% to 1.5%, W/C ratio of 0.40 with HPMC dosage of 0.5%, 0.75%, and 1.5%, and W/C ratio of 0.45 with HPMC dosage of 0.45, or be extended in the case of W/C ratio of 0.4 with HPMC dosage of 1.0% and W/C ratio of 0.45 with HPMC dosage from 0.75% to 1.5%. Fluidity measurement shows HPMC significantly improves the shape retainability. Furthermore, the addition of HPMC remarkably increased the compressive strength of extruded mortar. The results showed that HPMC could be used to prepare 3D printing SAC having satisfactory shape retainability, setting time and compressive strength.

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Effects of ordinary Portland cement on the early properties and hydration of calcium sulfoaluminate cement

Cited by 105 publications

References 39 publications

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Strengths of Sulfoaluminate Cement Concrete and Ordinary Portland Cement Concrete After Exposure to High Temperatures

A Feasibility Study on HPMC-Improved Sulphoaluminate Cement for 3D Printing

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