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The influence of aggregate sizes on the structural properties of conventional concrete has been extensively studied, yielding valuable insights into concrete's …
The bond strength is slightly higher than rounded aggregates but not as required for high strength concrete. Angular Aggregates ... They give 10-20% more compressive strength due to development of stronger …
Effects of Higher Percentage of Stone Dust Used as a Fine Aggregate in Concrete and Variation of Strength due to the Variation of Cement Content and W/C Ratio January 2018 DOI: 10.13140/RG.2.2 ...
Sandoval et al. performed an experimental program to test and characterize the hydraulic behavior variation of pervious plastic concrete with natural aggregates and recycled aggregates due to clogging. Plastic concrete's hydraulic conductivity is reduced not only due to the porosity of plastic concrete but also by the particle size distribution ...
Recycled concrete aggregates (RCA) sourced from waste concrete are a sustainable alternative to natural crushed stone aggregates. ... Variation of workability due to addition of RCA. 3.2. Fresh density. The density of concrete is found to decrease with the increase in replacement ratio of coarse aggregate and is shown in Fig. 2. For …
Nonetheless, concrete deterioration caused by each type of alkali-aggregate reaction is similar. It should be known that no structure has ever collapsed due to alkali-aggregate reactions, but there are cases in which structural concrete members demolished due to the effect of alkali-aggregate reactions.
Abstract. This study examines the effect of the fine-to-coarse aggregate ratios on the fresh properties and mechanical properties of self-compacting concrete …
Pervious concrete is one of the innovation from conventional concrete which has interconnected void, thus enabling it to drain water. Compared to conventional concrete, pervious concrete has different physical and mechanical characteristics, but composed by the same material which is Ordinary Portland Cement (OPC), coarse …
Previous studies have been conducted on bamboo aggregate concrete as a partial replacement for crushed stone ... For the concrete cross-section, due to the randomness of the gaps and shapes between coarse aggregates, it is not feasible to divide the area into overly small regions. ... Coefficient of variation in aggregate distribution in …
Non-conventional aggregate-based concrete may exhibit different thermal responses compared to conventional concrete due to variations in mineral composition, porosity, and microstructure 16 ...
Aggregate transparency is when the dark areas of the mottled effect correspond with pieces of coarse aggregate near the form face. This is caused when, during vibration, fine particles, including cement, form a very thin layer over the aggregate in the narrow gap between the particles and the form face. ... Variations in the shade of …
In addition, the traditional construction industry consumes large amounts of natural resources, including natural sand and natural coarse aggregate (NCA). Crushing waste concrete as recycled coarse aggregate (RCA), recycled fine aggregate (RFA) and recycled powder (RP) to produce recycled aggregate concrete (RAC) not only releases …
a, and a. in cement stone and aggregate due to 1 deg C of temperature variation have been compiled and are shown in Figures 1, 2, and 3. Because temperature variation may be considered as an instantaneous effect, zero rate of creep ip has been assumed. The important relationships on the basis of the elasticity equations are given below: 1.
The inclusion of fiber in concrete influenced the mobility of concrete in the fresh state by acting as a barrier to the movement of coarse aggregate. It was observed that the concrete with an FA/CA ratio above 0.8 showed better flowability in the fresh state, whilst an above 0.9 FA/CA ratio requires excessive superplasticizer to maintain the ...
Given the fact that aggregate occupies 65-80 % of the concrete volume [7][8][9][10][11], the emphasis in currently available research on the possibility of using agro-waste in concrete is placed ...
Sandoval et al. (2020) performed an experimental program to test and characterize the hydraulic behavior variation of pervious plastic concrete with natural aggregates and recycled aggregates due ...
River sand has been the most preferred choice of fine aggregate due to its availability, affordability and minimal or no processing requirements. ... (1.3%) and it would therefore have reduced early concrete strength. The variation in chemical properties in the various aggregate samples can be attributed to the mineral compositions of the ...
gradations of fine aggregate. However, much of the variation in the slump of concrete occurred due to variation in the gradation of fine aggregate within the limits of acceptable gradation, i.e. between Control-1 and Control-3 gradations. Very little additional change in slump of concrete
The Strength of Concrete and its Relation to the Cement, Aggregate and Water, Bulletin No. 137: 1 116 This paper was limited to the study of the variation of concrete properties with variation of fine aggregate size so as to determine and model the behavior of concrete for the different sizes (classes) of fine aggregate used.
Concrete with calcareous aggregates loose more moisture due to the dolomite dissociation at about 780°C leading to about 30% mass loss. As observed by several researchers in the past as well as by present authors, concrete with siliceous aggregates exhibit 3–10% mass loss up to 1000°C [150], [176].
There is considerable variation in physical and mechanical properties of RCA, which primarily depends on the amount and quality of 'adhered mortar' (an undesirable old mortar adhered to stresses-sustained natural aggregates). ... In general, the density of RAC is lower than that of natural aggregate concrete due to the …
Concrete with a larger aggregate volume had a higher moisture content and lower drying shrinkage. Fig. 16 shows the variation law of concrete drying shrinkage with respect to time. The results indicated that the shrinkage decreased by approximately 15%–25% when the coarse-aggregate volume increased by 0.08.
This paper investigates the effects of adhered mortar content on the mechanical properties of recycled aggregate concrete (RAC) systems using two …
4.2.1.3 Influence of Strength of Parent Concrete. The strength of parent concrete, the size of natural aggregates used in the parent concrete, and the crushing stages intensely affect the properties of recycled aggregates (Akbarnezhad et al. 2013).The amount of adhered mortar on recycled aggregate and hence the water …
Although the properties of recycled aggregate concrete are widely considered to be inferior to those of natural aggregate concrete, research in the field still is of merit due to growing awareness ...
Recently, concerns have been rising about the impact of increasing the depletion of natural resources and the relevant generation of construction and demolition waste, on the environment and economy. …
Sleeper is one of the most important components in a railway track system. Thus, for accurate analysis and design of concrete sleepers, knowledge of imposed loading pattern is necessary. Sandy desert areas are critical regions where loading status of concrete sleeper is different from other areas. In these areas, the influence of flowing …
Recycled concrete (RC) produced using recycled coarse aggregate (RCA) has been the subject of numerous studies. They studied the physical characteristics of RCA, replacement ratio, mixing and curing procedures, modification techniques, workability of fresh concrete, as well as the mechanical, durability, and long-term properties of …
Extensive use of cement in the construction industry increases CO2 emissions and has a negative impact on the environment. In this work, recycled coarse aggregate (RCA) from construction and …
In recycled aggregate concrete, though there may be some additional hydration compounds developed due to the reactions between old cement mortar adhered to RCA and new cement matrix, still the percentage area of porosity is higher. ... This variation defines the width of ITZ. The width of ITZ in both normal concrete and …