Design a concrete mix according to the following conditions:   Design Specifications  Concrete ramp (not reinforced) Slab thickness =270 mm Design strength (fc) = 25.5 MPa Standard deviation s= 1.86 MPa on 200 specimens Environment = Severe exposure to freeze-thaw and de-icing chemicals Slump = 50 mm   Materials Available Cement: Type GU; specific gravity 3.15 Admixture: Air entraining admixture  8 ml/1% air/100 kg cement . Coarse Aggregate: Nominal maximum size = 37.5 mm Type = Crushed stone Bulk oven-dry specific gravity = 2.63 Absorption = 2.1% Oven-dry rodded density = 1755 kg/m3 Moisture content = 1.5% Fine Aggregate Type = Natural sand Bulk oven-dry specific gravity = 2.55 Absorption = 3.1% Moisture content = 4.3% Fineness modulus = 2.40

Q: What is the minimum strength that concrete must reach prior to freezing so that the overall strength…

A: The minimum strength that concrete mus overall strength gain is not affected:

Q: choose the correct option please Silica fume admixture increase concrete strength up to  60 MPa  120…

A: This question is related to Concrete technology from Civil Engineering. In this question ask about…

Q: We require a mix with a mean 28-day compressive strength of 26.5 MPa) the size of the member and the…

A: Given DataThe spacing between reinforcing steel = 50 mmThe compressive strength concrete at 28 days…

Q: The following mix design information is provided to you for 1 m³ concrete. • Air content = 5% • w/cm…

A: Reference : Concrete technology, Mix design ACI 318 mix design code Given : Air content, w/c ratio,…

Q: We require a mix with a mean 28-day compressive strength of 28 MPa. The slump is selected to be 40…

A:

Q: Amswer the following questions: Part I (True or False) 1) Aggregates having high absorption value…

A: 1) False - Aggregate having low absorption ratio are preferable for concrete so that water- cement…

Q: 2. Design a non-air-entrained concrete mix using, ACI Method for a reinforced Concrete Work for the…

A: req char. comp. strenght f'c = 22 MPaSlump = 50 mmFM = 2.8Max Aggregate size = 70 mm

Q: Although the constituents of concrete (aggregate and hydrated cement paste) behave in a linear…

A: Although aggregate and hydrated cement paste have linear stress-strain curves but the concrete…

Q: This refers to a change from liquid state to solid state of cement paste

A: Setting is the process in which cement concretee starts solidifying and gaining strength. Curing is…

Q: () attributes the most to the strength of hardened cement paste.

A: This question is from Concrete Technology.

Q: The recommended dosage on a viscosity modifying admixture is 5 fl oz/cwt. The proportions of the…

A: Recommended dosage on a viscosity modifying admixture = 5 fl oz/cwt. Coarse aggregate = 1800 lbFine…

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