Though other methods were updated for repairing a concrete structure, improving the bond strength of the interfacial layer with effective additives is still the remarkably outstanding technique since it highly improves the structure without any compromise with the quality and strength parameters. The primary reason for the investigation is to compare the market available materials like epoxy and latex with polymer based binding material named glycoluril by slant shear test in both compression and tension. In this comparative study, epoxy bonding depicts higher bond strength in compression than the latex bonding, whereas 3% of glycoluril bonding in the interfacial layer provided for 1cm thick in the interfacial layer were noted to improve the tensile bond strength between the old and new concrete layers which turns to be effective in the repair works of bottom of the slab/beam where tension is more.

In this study, an endeavor is made to discuss mainly the mechanism, use, and application of polymer modified concrete which is increasing in general fame due to its simplicity, ease of handling, proficiency, and agreeable outcomes. This work explores the impact of adding a new polymer named glycoluril on the mechanical property through the estimation of compression, tension, and flexural strength. Physical properties such as density, sorptivity, and acid resistance were studied to establish the durability of concrete. This examination additionally ponders the impact of polymer in concrete and polymer dosage. Series of concrete mix with 0%, 1%, 2%, 3%, and 4% glycoluril by the mass of binder were prepared, cured, and tested in 7 days and 28 days. Results indicate that there is no adjustment in the workability aspect, however, the improvement of strength factor in compression, tension, and flexure is recorded when compared with the conventional concrete. The experimental results show that by increasing the proportion of glycoluril, the strength of concrete increased up to 3% in addition. In the meantime, the 3% addition provided a higher outcome than the other blend. Further expanding the polymer content marginally decreased the strength. The outcome affirms that the utilization of new polymer in concrete will increase the desired property.

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Abstract. Formaldehyde is environment contamination, which causes irritation in the eyes, nose, and throat with concentration above 1.0ppm. But still, it is used as a construction material as an admixture and furthermore to make paints, adhesives, pressed wood, and flooring materials, etc. This paper reviews the impact of formaldehyde in the cement on flow, strength, and durability properties. In this most of the researchers studied the water reducing nature of formaldehyde-based cementitious materials (FBCM) because of its repulsive property, that can ensure improved workability and provides good mechanical strength. Finally, the challenges in the application of formaldehyde in cement-based materials are discussed to conclude some future scope in the field of the construction industry to use formaldehyde in cement.

Polymer cement mortar/concrete with enhanced mechanical strength could be an asset in the construction process as it improves concrete with desirable functionality. With few merits and demerits, several synthetic polymers are available in local markets such as epoxy, latex, urea-formaldehyde, and other resins to enhance the strength of concrete. In this paper, we decided to explore glycoluril with cement to create a new type of polymer modified mortar/concrete. Glycoluril remains unrevealed in mortar/concrete study along with the strength analysis and it is expected to create a new avenue in concrete materials together with formaldehyde since this polymer allows incredible quantum of strength to the concrete under various combination of glycoluril and formaldehyde. This new polymeric material is presumed to develop mortar/concrete materials with higher strength in the future.

For the past few decades innovation in construction material has grown a lot. This leads to special concrete such as self-compacting concrete, geopolymer concrete, self-healing concrete, etc. To prepare a special concrete apart from regular concreting material some sort of special materials was also needed, like mineral and chemical admixtures. Hence it is necessary to study the effect of these admixtures in cement paste and mortar before studying the same in concrete. Hence an attempt is made to study the effect of mineral and chemical admixtures in the fresh and hardened properties of cement paste and mortar. For this study ultrafine natural steatite powder is taken as mineral admixture and polycarboxylic based superplasticizer and glenium stream 2 were taken as chemical admixtures. Ultrafine natural steatite powder was used as additive to cement in various percentages like 0%, 5%, 10%, 15%, 20% and 25%. Superplasticizer and viscosity modifying admixture were taken as 1.5% and 0.5%, respectively. Then various combinations were worked out. To study the fresh property of cement paste consistency, initial setting time and miniature slump cone test were done based on the results yield stress of cement paste also calculated empirically. To study the hardened property compression test on cement mortar was done. Based on the test results it is clear that the addition of ultrafine natural steatite powder increases the water demand hence reduces the workability. On the other hand, it increases the compressive strength up to a certain limit. Adding superplasticizer increases the workability and reduces the water demand and viscosity modifying admixture reduces the bleeding and segregation effects hence increases the compressive strength.

Abstract. This paper studied the effect of Sulfonated-Melamine Formaldehyde (SMF) on the water cement ratio, setting time, compressive strength at various ages and an acid resistance test was conducted using sulfuric acid. Sulfonated-Melamine Formaldehyde is classified as superplasticizer. SMF was mixed with concrete at 1%-5% in volume fraction. But not much investigation was made. In this study it was found that the Sulfonated-Melamine Formaldehyde incorporated concrete mixture performing well in strength property and have more resistance to aggressive environment when compared to conventional concrete.

Repairing old concrete include the correct choice of material and methodology adopted which may not affect the quality providing monolithic condition for old and new concrete. This study investigates two different parameters such as the impact as well as the optimum usage of new polymer glycoluril-formaldehyde as bonding material. Second one is about to understand the surface preparation for increased bonding strength at the interfacial area of old and new concrete. Five different types of surface textures are used to estimate the bond strength such as plane, lined, waved, grid and chipped. Glycoluril aids as a bonding material in both old and new concrete, and it is introduced at 0%, 1%, 2%, 3%, and 4% into the cement mixture. When the surface preparation creates a rough surface, it helps in repairing the concrete with the help of polymerization of glycoluril formaldehyde which promotes the enhancement of bond strength and slant shear. The bond strength of the specimens was measured by slant shear method in compression as well as tension for a period of 1, 2 and 4 weeks of new concrete. The results indicated that the highest bond strength was achieved in 3 percentage addition of glycoluril and grid patten substrate preparation.