Shrinkage reducing concrete admixture offset the influence of high-shrinkage aggregates. In this case, cost comparison between cost of shrinkage reducing concrete admixture and good quality aggregate should be made to specify economic option.
This study aims at evaluating synergistic influences of limestone powder (LP) and unground rice husk ash (URHA) utilizations on comprehensive performances of a slag-cement self-compacting concrete (SCC). In addition, the improved strength efficiency of the binders in concretes due to the additives of LP and/or URHA was also explored. …
Concrete admixtures allow designers to alter a concrete recipe for various circumstances. This article covers a number of common concrete additives.
The effectiveness of water reducers on concrete is a function of their chemical composition, concrete tempera-ture, cement composition and fineness, cement content, and the presence of other admixtures.
This study examines the impact of mix design parameters on the environmental effects of producing concrete and reinforced concrete buildings by conducting a life cycle assessment (LCA) and carbon footprint analysis (CFA). The study is limited to the cradle-to-gate phase, including the extraction and production of raw …
The main focus of this review is to demonstrate the effects of supplementary cementitious materials and chemical additives on the physical, mechanical and durability properties of hydraulic concrete.
The present paper deals with a targeted modification of two kinds of. alternative additives - waste from glass production and natural mineral filler and. explores th eir effect on the properties ...
This paper presents an investigation on lightweight ed concrete (LFC) with different type of additives. LFC with 600, 1000 and 1400 kg/m3 density were cast and tested.
Cement additives and concrete admixtures are construction chemicals that reliably improve the sustainability of a broad range of cement-based systems. This improvement can be derived from enhancing durability and strength through water reduction, and catalyzing the cement hydration process to enable replacement of clinker …
Abstract. Important developments in additive manufacturing of concrete (AMoC) have been achieved in the past decades. Like other additive manufacturing processes, interdependence between material design, process effects, and part performance exists in AMoC. In this chapter, material design of various cement-based …
Many studies have been carried out on natural and bio-additives to reduce the cement usage rate in the preparation of cementitious composites [1]. Akindahunsi [2] examined the effect of starch extract from cassava and maize on concrete properties and it was found that starch has a positive effect on the long-term mechanical properties of …
The study on mineral additives in concrete durability by authors offers a comprehensi ve. examination of the complex effects of several mineral admixtures explaining how these. compounds affect ...
In this review, special emphasis is given to the various chemical additives and their role in protecting rebar from corrosion. Specialized concrete for novel applications, namely self-curing, self-healing, superhydrophobic, electromagnetic (EM) wave shielding and self-temperature adjusting concretes, are also discussed.
An admixture which, when added to concrete, mortar, or grout, increases the rate of hydration of hydraulic cement, shortens the time of set in concrete, or increases the rate of hardening or strength development. Accelerating admixtures can be divided into groups based on their performance and application:
This paper focuses on the efects of adding graphene and graphene-based compounds as additives to concrete, examining their impact on the material mix proportions, the methods used to incorporate them, and the resulting microstructural, mechanical, and …
The scope of the present paper is to understand the effects of crystalline admixture on the self-healing capacity of the cementitious composites. Previous studies were examined and a conclusion was drawn to the effect that different additives to crystalline admixture tend to improve self-healing of concrete for larger cracks. It is …
Effect on fresh concrete due to mineral admixtures shows variation in mechanical and durability properties compared to conventional concrete [ 8 ]. Usage of supplementary cementitious materials in the preparation of concrete can leads to significant energy savings, cost savings and environmental pollution reduction [ 9 ].
Dosages needed vary by the particular concrete mix and type of superplasticizer used. They can also produce a high strength concrete. As with most types of admixtures, superplasticizers can affect other concrete properties as well. The specific effects, however, should be found from the manufacturer or concrete supplier.
The way of sulphate attack depends on a pozzolanic additives and kind of sulphate solution. X-ray phase analysis of concrete in different depth after exposure in solution identified gypsum for concrete with additives only up to10 mm.
The water-cement ratio is important part of concrete composition formula where the effect of plasticizers added for purpose to reduce the amount of mixing water and obtainment of sufficient workability of fresh concrete is reflected. Therefore through the feedforward the concrete strength is influenced with expected increase of resulting values.
this study is to produce lightweight concrete suitable for road pavements and other structures exposed to acid effects. For this, the effect of silica fume (SF) and fl ash (FA) on acid resistance and strength development of lightweight concrete with perlite aggregates was investigated. Five different
In this research, it was studied the dossing effect of nopal mucilage and Ixtle fiber as additives for the enhancement of concrete's mechanical properties: compression strength, flexural strength ...
The successful use of admixtures depends on the proper combination of ingredients and concrete. Most admixtures are supplied in ready-to-use liquid form and are added to the concrete at the factory or construction site. Some additives such as pigments, extenders, and pumping agent, etc., used only in extremely small amounts, generally from the …
In order to add natural additives to concrete, several experimental and field tests were performed, in which the effects of natural additives on the properties of concrete and their long-term ...
Also, chemical admixtures enable the manufacture and construction of special concretes such as high fluidity concrete, high strength concrete, underwater concrete, and sprayed concrete. This three-part article reviews recent developments in admixture chemistry and applications, with a focus on polycarboxylate (PCE) …
This research aims to study the effect of superplasticizer, when mixed with local materials, on both fresh and hardened concrete properties to achieve the demands of engineers and contractors.
Bacteria spore added to the concrete mixture and curing in bacterial media increased the compressive strengths of concrete by up to 9,52 % at the end of 28 days of curing. Bacterial curing and the ...
Nanomaterials have emerged as potential environment friendly lubricant additives to upgrade the conventional lubricants such as automotive oils, industrial oils, grease, and metal working fluids. The applications of nanoparticle additives are based on the principles of solid lubrication and are mostly used as anti-wear, anti-friction and …
This study aimed to determine the effect of marble microparticles as an additive on concrete mixes' physical and mechanical properties. Specifically, …
Additives are substances that are added to the cement mix to improve its properties or performance. They are commonly used in cement mixtures to improve the workability, setting time, and strength of the final product. Some of the most common additives used in cement mixes include:
The high-temperature resistance of concrete is naturally affected by the materials in the mixture of concrete. As is known, cement, aggregate, water and when necessary, chemical and mineral additives are used in the concrete mixture.
