— The present paper provides comprehensive evaluation of utilization of sea sand in concrete and emphasises the need for further research on sea sand as fine aggregate in concrete. Key words: Sea ...
— For concrete based on seawater and sea sand mixed with admixture, the downward trend of late strength is significantly delayed, the late strength of concrete based on the seawater and sea sand ...
— In this study, the effect of seawater and sea-sand on the properties of concrete made with two different kinds of cement were analyzed. Therefore, four kinds of concrete and four kinds of cement paste specimens were designed as shown in Table 2.The concrete specimens were prepared for compressive strength test, and the cement …
— The paper shows the promising use of sea sand for additive technologies in construction. The use of sea sand reduces the setting time of the concrete mix and increases the ... properties of sea-sand concrete with fumed silica . Construction and Building Materials. 188. 1085-1091 [4] Younis A, Ebead U, Suraneni P and Nanni A …
Concrete additives are used to achieve desired workability in case of low water cement ratio, and to enhance setting time of concrete for long distance transportation of concrete. So, it is of much importance for a …
— P.O. 42.5 R early-strength cement, sea sand, river sand, UWB-II AWA, freshwater, and seawater were used in this experiment. The gradation of river sand and sea sand is plotted in Fig. 1 (a), and the XRD (X-ray diffraction) patterns are shown in Fig. 1 (b).Sea sand had a smaller particle size compared to river sand, but there were no …
— The paper presents the research results of the influences of some adhesive types on the properties of reinforced concrete using local materials such as sea sand …
Sorptivity and mechanical properties of fiber-reinforced concrete made with seawater and dredged sea-sand D Vafaei, R Hassanli, X Ma, J Duan, Y Zhuge Construction and Building Materials 270, 121436, 2021
— Use of sea sand that contains seashells to replace fine aggregate: García et al. (2009) ... Inclusion of seashell ash powder as additive in OPC blended concrete has been reported to influence its workability negatively (Olivia and Oktaviani, 2017). However, the results show that the initial and final setting times increase with increase in the ...
— The use of seawater, sea sand, and coral aggregates in concrete mixes has become an alternative solution for coastal and marine structures, especially for offshore structures and artificial islands. ... Yao H, Wang R, et al. Chemically functionalized graphene oxide as the additive for cement-matrix composite with enhanced fluidity and …
Seawater may carry sand and silt especially at the shallow end of the sea. When it forcibly contacts the concrete surface abrasion occurs. Abrasion also occurs due to mechanical force buy wave action. Theoretical Aspects If concrete structure is built in seawater, then the most affected area of the structure is well above the high water mark.
— This study focuses on seawater concrete (SWC), an innovative and sustainable construction material with diverse applications. The paper provides a …
Dr. Tran Tuan Hiep (Vietnam) Researching on using sea sand to produce cement concrete for road pavement construction The strength of cement concrete using sea sand is less than traditional cement concrete using …
— In addition to cement, sand, gravel, and water, the current investigation of the influence of additives on the compressive strength of concrete at 28 days includes fly ash, silica fume, and slag. 315 concrete compositions with various amounts of additives are trained and tested using an artificial neural network. Concrete strength is largely affected …
— The use of sea sand and seawater in concrete can provide sustainability to natural resources, while improving the mechanical …
Xiao J, Qiang C, Nanni A, Zhang K (2017) Use of sea-sand and seawater in concrete construction: Current status and future opportunities. Constr Build Mater 155:1101–1111 42. Yamazaki K (1974) Viewpoints on using sea sand in concrete as fine aggregates in Japan. Concr J 12(10):72–76 Effects of Seawater and Sea-Sand on Concrete Properties …
cement content of 600 pounds per cubic yard (pcy). If more than 700 pcy of portland cement are used, m e a s u r es should be taken to mini-m i z e cracking in thin members due to thermal stre s s e s . Pa r tial re p l a c e - ment of the cement by a poz z olan or the control of concrete tempera t u r e can reduce thermal cra c k i n g ...
Designing concrete for exposure to seawater. Low permeability is critical. BY BRUCE A. SUPRENANT. Seawater causes both chemical and physical deterioration processes to …
— According to the findings, concrete with a better substitution of fine aggregate utilizing sea sand and micro silica raises the strength of the concrete by 25%. Micro …
— The seawater sea-sand concrete utilized in this study has a design strength of C50, and its mix is presented in Table 2. The seawater utilized is artificial seawater, which was prepared by adding sea salt to freshwater in a ratio of 1:0.035. The seawater sea-sand concrete for standard cube specimens is the same batch as the concrete used …
— The chloride ion introduced into seawater or sea sand makes the chloride ion concentration threshold reach the height required for the destruction of the steel passivation film earlier. Compared with ordinary concrete, seawater and sea sand can induce and …
— 1. Introduction. The resource shortage of freshwater and river sand is an urgent issue in infrastructure development. Excessive exploitation of river sand for construction has led to severe environmental concerns [1].By contrast, the exploitation of rich resources of seawater and sea-sand in coastal regions is restricted, due to excess …
— Seawater and sea sand concrete (SWSSC) refers to concrete prepared by replacing river sand and freshwater with sea sand and seawater. Sea sand has the advantages of low mud content, good grading, and excellent working performance, making it an ideal building material [6].As one of the earliest countries in the world to use sea …
— Sand is often utilized as a fine aggregate in concrete, contributing 22 to 62% of the total mass. The quantity and features of sand in concrete have an impact on its workability, mechanical characteristics, and durability. Effective replacements are needed as natural silica sand becomes scarcer. By incorporating these by-products into …
— Mineral additives such as coal fly ash cement (FAC) and blast-furnace slag (BFS) do not clearly decrease the pH in the surface region, as surface pH after 5 months of aging are still >12 [4]. ... Therefore, when constructing oceanic island and reef foundations, this type of seawater sea-sand concrete is preferred due to its improved ductility ...
The final, critical, step for concrete is to apply a primer. 3M's installation instructions say to paint on the primer over a clean concrete surface. It can be used over sealed or painted surfaces. "Since concrete isn't smooth, the primer smoothes the surface and creates double the adhesion," said Dan with Martinson-Nicholls, a 3M distributor ...
— The combined use of seawater and sea sand is also found to increase the seven days compressive strength of concrete by 36–76%, but 28 days strength is approximately the same, and strength at 180 days is 3.7–10.2% lower when compared with freshwater concrete (Xiao et al., 2019).
— Pit sand–cement, and sea sand-cement mortar prisms were separately prepared using cement-sand mix ratio 1:3, and RHA composition of 0–44.44%. The optimum strength of the pit sand-cement mortar prisms after 1, 2, 7, and 28 days was recorded at 11.11% RHA by the mass of the cement. However, the compressive …
— This study investigates the compressive strength of ordinary Portland cement mortar prisms with rice husk ash (RHA). Pit sand–cement, and sea sand-cement mortar prisms were separately prepared ...
— Advantages of Sea Sand. Sea sand particles are rounded or cubical, same as river sand. Grading of the sea sand is finer than the river sand. It does not contain silt or organic materials. Readily available …
— The results indicate that the utilization of seawater and sea-sand in preparation of concrete is very promising with accelerated cement hydration, improved pore structure and durability only if ...
