Optimization of the SO3 content of an Algerian Portland cement: Study on the effect of various amounts of gypsum on cement properties

Siline, Mohammed; Omary, Safiullah

doi:10.1016/j.conbuildmat.2017.12.218

Cited by 62 publications

(29 citation statements)

References 30 publications

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“…However, as reported by Mohammed and Safiullah [33], and shown in Figure 1, it has been proven through testing that the maximum hydration degree (elapsed time of 72 h) and compressive strength (elapsed time of 48 h) are increased when SO3 content is approximately 3.0%-3.2%. To maximize early compressive strength and apply the findings to construction sites, the research team added gypsum to OPC clinker, increasing SO3 to 3.1% and improving fineness by 111.8% (400 cm 2 /g on 3400 cm 2 /g).…”

Section: Introductionsupporting

confidence: 55%

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

Lee¹,

Lee²

2019

Materials

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In this study, the influences of chemical composition and fineness on the development of concrete strength by curing conditions were investigated through performance evaluation of high SO3 Portland cement (HSPC) and ordinary Portland cement (OPC). At the same fineness (3800 cm2/g), the initial and final setting times of HSPC were 92 and 98 min less than OPC. Early mortar compressive strength was approximately 176% higher after 24 h. After curing for 15 h, 18 h, and 24 h, the maturity of HSPC concrete (107.4%, 109.6%, and 111.7%) and early compressive strength (146.4%, 170.7%, and 154.5%) were higher than measured for OPC concrete. HSPC fineness was 111.8% higher than OPC, leading to early activation of the hydration reaction. By X-ray fluorescence analysis, the SO3 content of HSPC was 107.9% that of OPC. The applicable time for HSPC concrete form removal was shorter than that for OPC concrete. The relationships y = −10.57 ln(x) + 47.30 and y = −9.84 ln(x) + 44.05 were estimated for predicting the early-age strength OPC and HSPC concrete. Therefore, applying HSPC concrete to an actual construction site is expected to shorten the construction period and reduce the heating curing cost in winter compared to OPC concrete.

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Section: Introductionsupporting

confidence: 55%

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

Lee¹,

Lee²

2019

Materials

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“…This implies that the production of ettringite is increased by the supply of SO 3 , as with the high SO 3 content in LCDBA, at 47.1%. In addition, Mohammed and Safiullah [ 27 ] revealed that the amount of ettringite formation highly correlates with the amount of SO 3 .…”

Section: Test Results and Discussionmentioning

confidence: 99%

Fresh and Hardened Properties of Portland Cement-Slag Concrete Activated Using the By-Product of the Liquid Crystal Display Manufacturing Process

Choi

Pyo

2020

Materials

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This experimental research investigated the applicability of the liquid crystal display (LCD) by-product of the refining process as a sustainable and alternative alkali activator for ground granulated blast-furnace slag (GGBFS) blended cement concrete. Three levels of binder replacement using the industrial by-product, and four water/binder ratios were considered in order to evaluate the effects of the replacement in fresh and hardened properties of the blended concrete. XRD and TG analyses confirmed that the by-product that contains abundant alkali compounds promotes the reactivity of GGBFS. The test results indicated that the incorporation of the by-product results in delayed setting and degraded workability due to the highly porous nature of the by-product, yet shows rapid early-age strength development of the blended concrete as conventional alkaline activators for GGBFS. These characteristics shed light on a simple yet effective and practical means of reusing the industrial by-product as an alternative alkaline activator.

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“…Its common composition is mainly defined by clinker and calcium sulfate. Clinker is formed by mixing and firing limestone and clay in rotary kilns at temperatures up to 1450 °C, resulting mainly in the phases: i) alite (C 3 S): 50% to 70% by mass, which determines the initial hydration through setting time and the strength development by precipitation of C-S-H calcium silicate gel and portlandite [31]; ii) tricalcium aluminate (C 3 A): 7% to 11% by mass [41], extremely reactive phase that affects hydration kinetics at an early age and reacts according to the presence or absence of calcium sulfate and Ca(OH) 2 [42]; iii) belite (C 2 S): reacts after 7 to 10 days of the mixture with water [43]; and iv) calcium ferroaluminate (C 4 AF): 7% to 13% by mass [41], reacts slowly but without calcium sulfate can react 40% after 1 day of hydration [43]. In Figure 7: Schematic of length changes of self-leveling cementitious mortars with and without shrinkage compensation by fast set and expansion at air conditions up to 160 days (adapted from [24,25]).…”

Section: Raw Materials Of Ternary System Opc-cac-casomentioning

confidence: 99%

“…Recently, the geochemistry dissolution theory has also been considered by many authors as an evolution for the interpretation of Portland cement hydration; however, it is still not totally established [44,45]. The optimum amount of calcium sulfate ranges from 3% to 5% by mass [41,46,47]. Above this value, the setting time remains practically constant, causing overdosage of the material and strength decrease [41].…”

Section: Raw Materials Of Ternary System Opc-cac-casomentioning

confidence: 99%

Ternary system Portland cement-calcium aluminate cement-calcium sulfate applied to self-leveling mortar: a literature review

2021

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The modernization of building systems is increasingly demanding products that improve efficiency during their processing. The development of self-leveling mortars for the regularization of flooring is a consequence of this evolution. The high contents of binder and water to obtain self-flowing property, plus the application of thin layers over large areas, make this type of mortar susceptible to high shrinkage levels. Thus, the ternary system Portland cement-calcium aluminate cement-calcium sulfate (OPC-CAC-CaSO 4) is a viable solution for shrinkage compensation. The expansion mechanism based on ettringite formation aims to prevent the mortar from cracking. Considering its complexity and that international literature is still limited (while Brazilian is null), this article presents a literature review that covers diverse aspects related to the application of the system OPC-CAC-CaSO 4. The influence of raw materials and mix proportions on rheological behavior, reaction kinetics, development of strength, and length change are discussed.

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Optimization of the SO3 content of an Algerian Portland cement: Study on the effect of various amounts of gypsum on cement properties

Cited by 62 publications

References 30 publications

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

Influences of Chemical Composition and Fineness on the Development of Concrete Strength by Curing Conditions

Fresh and Hardened Properties of Portland Cement-Slag Concrete Activated Using the By-Product of the Liquid Crystal Display Manufacturing Process

Ternary system Portland cement-calcium aluminate cement-calcium sulfate applied to self-leveling mortar: a literature review

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