Investigation on fundamental properties of microfine cement and cement-slag grouts
TL;DR: In this article, the properties of six different MC grouts (three portland-based and three slag-blended) and two ordinary Portland cements (ASTM I and III) are measured.
About: This article is published in Construction and Building Materials.The article was published on 2017-10-30. It has received 45 citations till now. The article focuses on the topics: Compressive strength & Superplasticizer.
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TL;DR: In this paper, the ASTM Type I Portland cement (PC), class F fly ash (FA), bentonite (B), superplasticizer (SP) and water glass were designed to improve properties of grouting materials in different aspects.
95 citations
TL;DR: In this paper, a literature review and collecting information on the application of polyurethane chemical grout for improving the properties of weak soils has been conducted and the review concluded that improved polyurethsane has the potential to improve weak soil types for infrastructure development.
86 citations
TL;DR: It is shown that fresh properties largely depend on the type of precursor (GBFS or FA) and the slump and setting time of GBFS-rich pastes was significantly reduced, and the optimum GBFS/FA ratio for their future use in concretes is recommended.
Abstract: The engineering properties of alkali activated materials (AAMs) mainly depend on the constituent materials and their mixture proportions. Despite many studies on the characterization of AAMs, guidelines for mixture design of AAMs and their applications in engineering practice are not available. Extensive experimental studies are still necessary for the investigation of the role of different constituents on the properties of AAMs. This paper focuses on the development of alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) paste mixtures in order to determine their suitability for making concretes. In particular, the influence of the GBFS/FA ratio and liquid-to-binder (l/b) ratio on the slump, setting, strength, and autogenous shrinkage of the alkali activated pastes is studied.It is shown that fresh properties largely depend on the type of precursor (GBFS or FA). The slump and setting time of GBFS-rich pastes was significantly reduced. These pastes also have higher compressive strength than FA-rich pastes. The study identifies important practical challenges for application of the studied mixtures, such as the behavior of their flexural strength and high amplitudes of autogenous shrinkage of GBFS-rich mixtures. Finally, the optimum GBFS/FA ratio for their future use in concretes is recommended.
83 citations
TL;DR: In this paper, a microfine-cement-based grout mixed with microfine fly ash (MFA), colloidal nanosilica (NS) and superplasticizer (SP) was designed to ensure desirable fluidity, less leaching and mechanical properties of grouts in geotechnical engineering.
48 citations
TL;DR: In this article, the effects of particle sizes of cement and nano-SiO2 on shear strength parameters, microstructure characteristics and rheological properties were evaluated, and the optimal superplasticizer dose levels of 1.5% and 0.75% were recommended for superfine cement grouts.
43 citations
References
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TL;DR: In this paper, the steric repulsive force acting on the surface of cement particles adsorbing the organic admixture was determined by measuring the interactive force between surface of cements clinker and an atomic force microscope, and measuring the zeta potential of fresh cement paste under actual water tocement ratio by electrokinetic sonic amplitude method.
470 citations
TL;DR: In this paper, the effect of various types of superplasticizers on portland cement component minerals was investigated and the value of the adsorption isotherm was calculated from the amount of the super plasticizer adsorbed on a cement component mineral in an equilibrated solution.
425 citations
TL;DR: In this article, a mini-slump test has been developed for the evaluation of the influence of water-reducing admixtures on the workability of neat portland cement pastes.
Abstract: A miniature slump test has been developed for the evaluation of the influence of water-reducing admixtures on the workability of neat portland cement pastes. Resulting paste pat areas rather than heights are measured, and the results are expressed as the percentage of water reduction. Relative effects of various admixtures on a portland cement are illustrated, and influences of specific admixtures on different cements are also shown. Effects of different superwater-reducing admixtures and combinations of ordinary and superwater-reducing admixtures are compared. The mini-slump method has also been used for the evaluation of the loss of workability (slump loss) with time for various admixtures and admixture combinations. The simplicity of the method facilitates accurate and effective evaluation of water-reducing admixtures.
342 citations
TL;DR: In this paper, a new method to estimate yield stress of high-performance, pseudoplastic grouts is proposed and shown to result in lower yield stress estimates than the other models.
241 citations
TL;DR: In this article, a study was conducted on the effect of a polycarboxylate (PC) admixture on the mechanical, mineralogical, microstructural and rheological behavior of Portland cement pastes.
Abstract: A study was conducted on the effect of a polycarboxylate (PC) admixture on the mechanical, mineralogical, microstructural and rheological behaviour of Portland cement pastes. It was observed that the presence of PC admixture retards the initial cement hydration reactions, although this effect may be offset by possible increased diffusion in later stages. Additionally, the PC admixtures produce a few alterations in the structure and composition of the formed C—S—H gel. The addition of 1% PC admixture in the pastes generates a higher percentage of silicate bridge (Si Q2 units) mainly at 2 days. The admixture used in this study induced microstructural modifications in the pastes which slightly reduced the porosity; however the admixture did not affect the mechanical strength of the pastes at either 2 or 28 days of hydration. Finally, from the results of the rheological studies it was concluded that a low dosage of PC led to a substantial reduction (over 70%) in the yield stress.
240 citations