Which concrete is expected to have more compact skeleton or denser, between concrete containing only one size of coarse aggregate and that with well-distributed size of caorse aggregate ?
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Which concrete is expected to have more compact skeleton or denser, between concrete containing only one size of coarse aggregate and that with well-distributed size of caorse aggregate ?
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- Which type of aggregate is more harmful for using in concrete? Angular Rounded Rough ElongatedWhat is your recommendation for the maximum size of coarse aggregate for the following situation? A continuously reinforced concrete pavement cross section contains a layer of No. 6 reinforcing bars at 6-in. centers, such that the steel is just above mid-depth of a 10-in. thick slab. Cover over the top of the steel is therefore about 4 in.choose the correct option pleasestrength of concrete increased whenUsing higher w/c ratioReducing w/c ratioUsing higher cement contentUsing smooth aggregate
- Concrete with a low water/cement ratio is expected to be: A) Stronger than concrete with a high water/cement ratio. B) More durable than concrete with a high water/cement ratio. C) More watertight than a concrete with a high water/cement ratio. D) All of the above statements.Subject: concrete technology Q1. (a) Describe the effects of C3S on the properties of concrete. (b) Which source of fine aggregate is preferred and why?Concrete is required for several structural members of a residential house. Due to the present moisture, it is expected that the concrete shall be non-aerated (Non AE) with a 28 day compressive strength of 3.000 psi for slabs and 4,000 psi for beams and columns. Due to extra moisture present in the site, the slump to be used shall be the minimum allowed by the ACI mix. Using a 3/4 inch max aggregate size, compute for the weight of cement, water coarse aggregate, and fine aggregate. Aggregate details: Cement: Type 1. Specific Gravity = 3.15 Coarse Aggregate: Bulk Specific gravity (SSD) = 2.65; absorption capacity = 4%. Dry-rodded unit weight= 100 lb/ft: surface moisture 1.2% Fine Aggregate: Bulk Specific Gravity (SSD) = 2.60: Absorption capacity = 1.5%: Fireness modulus = 2.70: Surface moisture= 496 Structural members dimmensions: Columns: 8 pes 300mm x 300mm x 3100mm (Length x Width x Height) Beam: 9 pcs. 300mm x 500mm x 4000mm (Length x Width x Height) Slab: 12000mm x 4000mm x 400mm…
- What is the relationship of rodded bulk density to percentage voids in aggregates? What is the purpose of this two? How can this two affect the concreteUrgent Take the unit weight of concrete to be 2400 kg/m3 and the specified compressive strength to be 28 MPa.From this, estimate the modulus of elasticity of concrete in GPa. (answer with complete solution) Final answer must be Ec = 26.752 GPaThe cement paste requirement for concrete is related to the void content of the combined aggregates. True or False?
- A concrete specimen with b = d is supported at both ends 600mm apart. It is tested for flexure strength with load at midspan of 100kN and failed with a flexural stress of 52.083 MPa. What is the dimension b and d of the specimen in mm?What is your recommendation for the maximum size of coarse aggregate forthe following situation? A continuously reinforced concrete pavement crosssection contains a layer of 19-mm reinforcing bars at 150 mm. centers, suchthat the steel is just above mid-depth of a 250 mm. thick slab. Cover over thetop of the steel is therefore about 100 mm.A normal-weight concrete has an average compressive strength of 4500 psi. What is the estimated modulus of elasticity? What is the estimated tensile strength of this concrete?