DNN and XGBoost for modelling of strength of porous concrete with recycled aggregates

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Study on sliding stability of porous-concrete retaining wall model test subjected to rainfall infiltration

The common disadvantage of a conventional retaining wall is a heavy object as a block that is difficult to lift and handle conveniently. A drainage pipe is commonly used to displace water from the backfill. In areas with high annual rainfall, the soil could be saturated in a short time and added lateral load significantly. In this study, porous concrete was utilized as a retaining wall material with the advantages of the lighter weight of the block and additional drainage capability due to its high void ratio. A set of a laboratory-scale retaining walls using conventional and porous concrete walls was investigated through three different rainfall modes. To initiate the instability condition, a vertical load was applied then the lateral moving was recorded using LVDT sensors. Soil moisture content sensors recorded hydrologic responses of the saturation process. The loading test results showed that the porous concrete wall model was being displaced less than experienced by the conventional concrete wall. It shows that the porous concrete wall model can withstand the load as the additional lateral load from infiltrated rainwater dissipates rapidly. Therefore, the porous concrete wall has the advantage of being used as a Retaining Wall Material.

Inclined porous concrete surface impact on infiltration using recycled concrete aggregate

Predicting the infiltration rate on inclined surfaces is a pending case, especially when compared to rain intensity. The inclined surface has less ability to generate ponding, leading to higher runoff and higher erosion rates. In the rainy season, on the highway with a very steep slope, erosion usually occurs and becomes very dangerous. By using porous concrete, it is expected to receive higher infiltration and less runoff. This study aimed to determine the impact of the inclined surface of porous concrete on infiltration capacity. The research was conducted using both natural coarse aggregate and recycled coarse aggregate made from concrete waste. The infiltration and permeability test were conducted using porous concrete slabs under 0 to 30% inclined surface. It was shown that the infiltration rate is getting lower as the surface is being steeper. It was also shown that porous concrete made from recycled coarse aggregate has higher performance on permeability and infiltration rate compared to porous concrete made from the natural one.

Mechanical Properties of Granite-Gravel Porous Concrete

The need for porous concrete has become increased due its ability to control surface water, increase the rate of recharging groundwater, and reduce pollution of the ecosystem. Granite is a coarse aggregate that is quite expensive when compared with gravel in Nigeria. Therefore, this research is aimed at optimizing blended granite and gravel in the production of porous concrete. Samples of blended granite-gravel porous concrete of varying mix proportions were produced using cement to aggregate mix ratio of 1:4. The samples were tested for their porosity, workability and compressive strengths. The data collected were analyzed with the aid of Design Expert 10.0. It was observed that the optimal combination for the granite-gravel blended porous concrete is 12% granite, 88% gravel, and a water-cement ratio of 0.66%. This combination gave a porous concrete with a compressive strength of 48.4 N/mm2, percentage porosity of 6% and a compacting factor of 0.91. These values when compared to that of the control specimen revealed that the optimal mix gave a porous concrete with higher porosity, higher workability and a better compressive strength.

Penetration and Strength Analysis of Pervious Concrete

Porous concrete is an amalgamation of coarse aggregate, Portland cement, and water, which permits rainfall water to permeate through the surface and into the ground before it runs off. Porous concrete encompasses little or no fine aggregates and adequate cementitious fixative to coat the coarse aggregate while keeping the voids interconnected. IRC 44-2017 states that range of permeability for pervious concrete should be from 0.135 cm/second to 1.22 cm/second and array of compressive strength should be 5MPa - 25MPa. In this experimental study, two properties of no fine concrete namely compressive strength and porousness at the curing age of 7th & 28rd days has been targeted. Compressive strength and Infiltration tests were conducted on the pervious concrete of grade M10 and M15 by keeping variation of fine aggregates of 0% - 5%. We observed that fines aggregate help to rise the compressive strength of porous concrete but decrease the permeability. Thus, by careful optimization of the mix, pervious concrete can be obtained for suitable use in low strength load.

Early Age Physical Properties of Porous Concrete Containing Slag Nickel Aggregate under Compression

The scope of this research is to make hollow concrete using Nickel Slag and compare it with crushed stone aggregate. The purpose of this study was to determine the amount of workability, porosity, permeability, and tensile strength of porous concrete, and to determine the effect of the 05-10 and 10-20 grading of the aggregate on the tensile strength, porosity and permeability of porous concrete. This study used an experimental method using aggregates with uniform gradations. The aggregates used are nickel slag and crushed stone with uniform gradations of 05-10 and 10-20. The cement water factor (FAS) used in the mix design is 0.35 and the cavity in the concrete is 20%. Workability testing is carried out after the fresh concrete is finished. mixed with the composition according to the mix design. Tensile strength test, with the compressive strength machine method performed at the age of the concrete 3 and 7 days. From the analysis with qualitative methods, porous concrete containing nickel slag and crushed stone in gradations 5 - 10 and 10 - 20 obtained the highest compressive strength values in the nickel slag aggregate mixture 5-10 and 10-20 of 10.70Average - average 10.51 MPa, Modulus of elasticity of 6316.43 average 6054.68 MPa, and Poisson Ratio of 0.1651 Average 0.1598.