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This paper depicts the results of an experimental investigation on the engineering properties and permeability of concrete in presence of Rice Hush Ash (RHA). For every 1000 kgs of paddy milled, about 220 kgs of husk is produced and after burned in boilers about 55 kgs of RHA is generated and dumped as waste. This study investigates the effect of t...
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... Coarse Aggregate (CA) was crushed stone with maximum size of 20 mm with specific gravity of 2.65 and water absorption 1.41 %. A grain size distribution curve of fine aggregate is shown in Figure 1 and that of coarse aggregate shown in Figure 2, and also the particle sizes are given in Tables 1 & 2. ...
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... From previous studies, it is seen that penetration depths increase for increasing replacements of cement by of RHA in concrete [78][79][80]. The average values for water penetration depths at 90 days, measured to the nearest mm are presented in Fig. 11. ...
The world today has started facing bigger problems related to the concrete industry, especially with concrete becoming the most extensively used construction material in the world. At a time like this, where more eco-friendly substitutions are stringent, it calls for a more comprehensive approach in producing recycled concrete from recycled concrete aggregates (RCA). This study is an extension to previous studies involving composite utilization of pozzolans in treating RCA. It investigates on the possibility of using rice husk ash (RHA) along with other pozzolans as a cement replacement, in both stages of aggregate treatment and concrete production. It was observed that through this treatment, aggregate specific gravity was increased to a value of 2.37 which was earlier 2.18 for untreated RCA, 26% and 59% reductions were obtained for water absorption and porosity of aggregates , respectively. Further the concrete which contained RHA in both stages, attained a high strength of 55.4 MPa, even surpassing the control mix containing natural aggregates. The same mix resulted a 12% increase in its surface resistivity. Rapid Chloride Permeability Test (RCPT) and water permeability results also showed substantial improvements when compared to the reference RCA mix. Similar to previous studies involving composite use of poz-zolans, improvements in the microstructure of both the aggregates and concrete through the use of RHA resulted in the amelioration of both mechanical and durability properties of concrete. This evidently indicates the possibility of achieving high strengths, even with the use of RCA derived from parent concretes of lower grades.
... Traditionally, concrete has always been defined as a mixture of aggregates (fine and coarse aggregates), cement and water that initiate the hydration process [1]. Its strength is commonly considered as its most valuable property, although other properties like durability, workability and permeability may be also important [2]. Cement and water form a paste that binds aggregates together to a concrete matrix while aggregates themselves are structural fillers. ...
... Then specimens placed for another 1 hour in cold water and weighed [8]. Basing on these independent processes we were able to determine the water absorption of the cubes prepared using equation (2). ...
... Water Absorption (%) = (2) In this case, a total of twelve concrete cubes were used; two for each percentage replacement of cement with ground rice husk. The average values of water absorption from the two cubes at the specified percentage of cement replacement were obtained and be recorded. ...
In the recent years, there have been considerable efforts all over the world to reuse by-products in order to sustainably conserve our environment. In this sense, rice husk is also an agricultural bi-product and its ash after being burnt has widely been used to replace Portland cement in the construction industry due to the fact that it is rich in pozzolanic content. However, no studies have been conducted to identify the definite temperatures to which rice husk can be heated to produce the perfect qualities required for enhancement of concrete. This prompted us to find out whether utilizing ground unburnt rice husk would as well be fit to be used in partial replacement of cement. This would save time and other resources used in heating rice husk to ash. This study evaluates how different contents of rice husk added to concrete may influence its workability, water absorption and compressive strength of concrete with 0, 1.5, 2.5, 5, 7.5 & 10% cement replacement at fixed water cement plus ground rice husk at 0.5. The results were compared to a controlled sample and the viability of adding ground rice husk to concrete was verified. For water absorption the results were negative as addition of ground un burnt rice husk resulted in increasing water absorption of concrete which is generally not good for its durability purposes. Values of workability varied with addition of ground un burnt rice husk but still within the allowable limits for concrete to be used on some construction works. Also, there was a break through on the compressive strength with 1.5% replacement of cement with ground un burnt rice husk achieving the target strength. Basing on this, we can therefore infer that cement can be reduced up to 15% with un burnt ground rice husk without compromising compressive strength requirements of concrete more especially in situations where water absorption is not very important.
... Generally, this medium is the product of reaction between hydraulic cement and water. Strength of concrete is commonly considered its most valuable property, although in many practical cases other properties like durability and impermeability may in fact more important (Hossain et al., 2009). It is known that fine aggregate acts as filler of course aggregate and it does not give significant strength. ...
Mixing time and Temperature have adversely influenced on the mechanical properties of concrete.
The traveling time of the transit mixture from the plant to the work site is critical, especially where the
forecast of travelling time is difficult due to a traffic jam or other uncertainties. At the same time, the
ambient temperature at concrete casting time is another factor. A laboratory study was conducted to
investigate the impact of different mixing time on the performance of concrete and find out its effect on
concrete. To achieve the study goal, the concrete mixtures drum was continuously rotated for up to 5,
60, 120 and 180 min maintaining a constant rotation of 15 per minute under a controlled temperature
of 25°C and 40°C. The effects of prolonged mixing scheme under various temperatures on critical
properties such as the slump loss, compressive strength, splitting tensile strength and permeability of
concrete were done at 3, 7, 28 and 90 & 120 days age of concrete. The results showed that concrete
can undergo substantial slump loss when subjected to prolonged mixing at 40℃ temperature. At 25℃
temperature, compressive strength decreased with the increase of mixing time; but at 40℃
temperature, reverse result was observed. At 25℃ temperature, splitting tensile strength decreased,
however, at 40℃ temperature splitting tensile strength was increased with mixing time and the
Permeability of concrete was increased with increasing of mixing time and temperature.
Keywords: Mixing time, Temperature, Strength, Permeability
... Generally, this medium is the product of reaction between hydraulic cement and water. Strength of concrete is commonly considered its most valuable property, although in many practical cases other properties like durability and impermeability may in fact more important (Hossain et al., 2009). It is known that fine aggregate acts as filler of course aggregate and it does not give significant strength. ...
