Contribution to the knowledge of melamine superplasticizer effect on some characteristics of concrete after long periods of hardening

Grabiec, Anna M.

doi:10.1016/s0008-8846(99)00024-1

Cited by 18 publications

(10 citation statements)

References 3 publications

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“…The examination of the microstructure on grout fractured surface at the maturity age of 7 days shows that, instead of larger and well-defined crystals, smaller crystals are formed (Figs 5 and 7). Similar observations were noted by other authors (Yilmaz, Glasser 1989;Grabiec 1999). Cement mixtures with melamine based SP, present structures smoother and compacter when compared to cement mixtures without SP.…”

Section: Compressive Strength and Air Contentsupporting

confidence: 91%

Contribution to the Design of Hydraulic Lime-Based Grouts for Masonry Consolidation

Baltazar

Henriques

Cidade

2015

Journal of Civil Engineering and Management

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Grout is a concentrated suspension that can be employed for the homogenisation and consolidation of systems presenting pores, voids and cracks, such as inner core of old stone masonries. A grout should be well conceived, taking into account the optimisation of its performance; this means that simple binder and water formulations prove to be inadequate. Hence, the effect of different admixtures and pozzolans, which are traditionally used in concrete, on the fresh and hardened properties of hydraulic lime grouts, were investigated. Hydraulic lime binder plays a role of great importance in the rehabilitation of historic structures, due to its compatibility with pre-existing materials, like mortars. However, hardly any information is presently known regarding the effect of these materials on the behaviour of hydraulic lime grouts. The improvement of their properties through the use of these products is still an open field. Hence, and as a first step, the prediction of grout properties in a laboratory setting were made. The results summarised in this paper are part of a large research project and precede the fine tuning of grout composition according to the characteristics of the masonry to which such a grout is to be injected.

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Section: Compressive Strength and Air Contentsupporting

confidence: 91%

Contribution to the Design of Hydraulic Lime-Based Grouts for Masonry Consolidation

Baltazar

Henriques

Cidade

2015

Journal of Civil Engineering and Management

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“…The water absorption stopped changing (2.9 %) when the maximum SP content of 1.2% was used Therefore we may state that water absorption decreases (~30 %) with the increase of SP content up to 0.8 % -1.0 %. These results were confirmed by [25] claiming that the influence of SP is expressed by an increase in the compressive strength after 28 days, lowering of water absorption, and improvement in frost resistance compared to concrete without admixture. (Fig.…”

Section: Test Results and Discussionsupporting

confidence: 53%

The effect of plasticizing admixture on the physical and mechanical properties of concrete with limestone cement

Gailius

Girskas²,

Abasova³

2013

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The article analyzes the effect of plasticizing admixture content on the physical and mechanical properties of concrete made of 50 % coarse aggregate. The plasticizer dosage levels proposed by the manufacturer (0.2 %-1.2 %) were examined and the optimum plasticizer dose (0.8 %-1.0 %) was established. The use of limestone Portland cement and the optimum content (0.8 %-1.0 %) of plasticizing admixture in the production of concrete increases the compressive strength, density, frost resistance, whereas the water absorption is reduced. The test results have revealed that plasticizing admixture insufficient or overdosing can reduce the physical-mechanical properties of concrete. With the optimum content of plasticizing admixture durable and frost resistant concrete can be obtained.

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“…sulfonated naphthalene‐formaldehyde (SNF) condensate and sulfonated melamine‐formaldehyde (SMF) condensate, were developed as SP in Japan and Germany. SNF, SMF SPs provide the good dispersing ability for the cement particles, at a low dosage, SNF, SMF SPs are able to reduce the water content in the concrete up to 30%, however, utilizing SNF, SMF SPs in the concrete also cause a low slump retention of the concrete . In the 1980, a polycarboxylate‐based (PCA) polymer was developed in Japan as the new generation of SP.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and dispersing mechanism of aminosulfonate‐phenol‐formaldehyde superplasticizer for the cement particles

2016

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In this study, a water-soluble aminosulfonate-phenolformaldehyde (ASPF) condensate was synthesized as superplasticizer (SP). The molecular structure of ASPF SP was characterized. The dispersing properties and the adsorption behavior of ASPF SP were measured and compared with sulfonated naphthalene-formaldehyde (SNF) SP. ASPF SP has the more negative polar groups and the higher molecular weight than SNF SP. SNF SP adsorbs on the cement particle surface through "Flat train" adsorption configuration to form a single-point adsorption. The higher adsorption amount and the thinner adsorption layer thickness. The dispersing ability of SNF SP for the cement particles is due to the electrostatic repulsion force between the cement particles. ASPF SP adsorbs on the cement particle surface through "loop and tail" adsorption configuration to form a multi-point adsorption. The lower adsorption amount and the thicker adsorption layer thickness. Moreover, due to the more negative polar groups bonded to the molecule of ASPF SP, the cement particle surface with ASPF SP has a larger initial zeta potential, less zeta potential loss than that with SNF SP. The synergistic effect of the electrostatic repulsion force and the steric hindrance results in that ASPF SP has the better dispersing properties for the cement particles than SNF SP.

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Contribution to the knowledge of melamine superplasticizer effect on some characteristics of concrete after long periods of hardening

Cited by 18 publications

References 3 publications

Contribution to the Design of Hydraulic Lime-Based Grouts for Masonry Consolidation

Contribution to the Design of Hydraulic Lime-Based Grouts for Masonry Consolidation

The effect of plasticizing admixture on the physical and mechanical properties of concrete with limestone cement

Synthesis, characterization and dispersing mechanism of aminosulfonate‐phenol‐formaldehyde superplasticizer for the cement particles

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