Superplasticized portland cement: production and compressive strength of mortars and concrete

Bouzoubaa, N.; Zhang, M.H; Malhotra, V. M.

doi:10.1016/s0008-8846(98)00154-9

Cited by 10 publications

(2 citation statements)

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“…It can be found that after curing by 90 days, the drying shrinkage of the WOS-F has exceeded 0.075%, which is beyond the value required by the standard according to AS 3600 (2004). Faced with such a problem, researchers prefer to add more water reducer into mortar to release the water entrapped in the cement clusters [48,49]. Hence, an additional set of mortar (WOS-SP) prepared with fine WOS and double-dose SNF SP and corresponding 85% water was supplemented in this study.…”

Section: Drying Shrinkagementioning

confidence: 99%

Particle Size Effect of Oyster Shell on Mortar: Experimental Investigation and Modeling

et al. 2021

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In order to solve the problem of lack of natural river sand, crushed waste oyster shells (WOS) were used to replace river sand. By replacing 20% river sand, WOS mortar with different particle sizes of WOS were made for the experiment. Through experimental observation, the initial slump and slump flow loss rate were studied. The effects of different particle sizes and curing times on the compressive strength, flexural strength, static elastic modulus, and dry shrinkage of WOS mortar were analyzed. The relationship formulas between the compressive strength, flexural strength, particle size, and curing age were proposed. The results showed that the setting time and slump flow decreased with a decrease in the particle size of WOS. It was also found that the mortar with fine crushed WOS had high compressive strength, flexural strength, and static elastic modulus at both early and long-term curing age. A formula was proposed to describe the development of the compressive strength with the particle size of WOS and curing time, and the relations among these mechanical properties were discussed. Furthermore, drying shrinkage increased when WOS was used and could not satisfy the standard requirement of 0.075%. In contrast, the addition of fine WOS and double-dose sulfonated naphthalene-formaldehyde superplasticizer (SNF SP) reduced the shrinkage rate of the mortar by 8.35% and provided better workability and mechanical properties for mortar.

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Section: Drying Shrinkagementioning

confidence: 99%

Particle Size Effect of Oyster Shell on Mortar: Experimental Investigation and Modeling

et al. 2021

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“…calcium as well as calcium hydroxide (lime) free lime tends to cause expansion in concrete, which makes the concrete prone to premature failure and inhibits its durability properties [4]. Challenges of the cement industry nowadays are the replacement (20 -50%) of Portland cement by pozzolanic materials [5]. Recent developments on ternary cement that are integrated in certain industrial wastes, natural resources such as limestone, pozzolan and clay judged as additional cementitious properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Bayiha¹,

Bahel²,

Kenmogné³

et al. 2023

Global J. Eng. Technol. Adv.

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The comparative study of some effects of natural and artificial pozzolans on the hydraulic properties of Portland cement mortar is performed in this work. The natural pozzolan used coming from the Djoungo deposit, Moungo department in the Littoral region (Cameroon) was finely ground and then sieved at 100 μm. The artificial pozzolan used is the alluvial clay of Etoa collected from Yaoundé III District in Mfoundi Division of the Centre Region of Cameroon. It was thermally activated at 700°C after grinding and sieving. The chemical and mineralogical analysis of the raw materials were studied by X-ray fluorescence, infrared spectrometry (FTIR) and X-ray diffraction (XRD) then the specific surfaces and the absolute densities were determined. The formulation of the pastes and mortar was obtained by substituting Portland cement with different pozzolans at different percentages, while the initial and final setting time of the fresh pastes were determined. Linear shrinkage, water absorption, apparent density, flexural strength and compressive strength tests at 7 and 28 days were determined on the hardened mortars. The results obtained show an increasing in the initial and final setting time with the addition of the amount of pozzolan (natural or artificial), the pozzolans played the role of setting retarder in the mixtures, finer particles of the artificial pozzolan speed up the setting time of pastes as compared to that with natural pozzolan. The shrinkage of the hardened mortars increased with the addition of the pozzolans, but it was less than 0.2% in all the samples, the specimens with artificial pozzolans were more affected by the drying shrinkage. The mortars had good mechanical resistance but from 30 to 40% pozzolan, whether artificial or natural, the resistance dropped, the dilution phenomenon caused by the partial replacement of the cement was responsible for the drop in resistance with the addition of pozzolans. The water absorption rate and the apparent density of the specimens decrease when the percentage of pozzolan increases in the mortars. Artificial pozzolan offers a better water absorption rate compared to natural pozzolan due to its higher specific surface. Natural pozzolan makes it possible to obtain a denser mortar.

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Integrated sustainability assessment method applied to structural concrete columns

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Fuente²

2013

Construction and Building Materials

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Superplasticized portland cement: production and compressive strength of mortars and concrete

Cited by 10 publications

References 1 publication

Particle Size Effect of Oyster Shell on Mortar: Experimental Investigation and Modeling

Particle Size Effect of Oyster Shell on Mortar: Experimental Investigation and Modeling

Comparative study of the effects of a natural pozzolan and an artificial pozzolan on the hydraulic properties of Portland cement mortar

Integrated sustainability assessment method applied to structural concrete columns

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