%VV @docs.google.comChose The Correct Answer- ۱۰:۳۳ صMethods that reduce the loss of mixingwater from the surface of the concretecan be done byPonding or immersionSaturated wet coveringsMembrane-forming curing compoundsAll of theseWorkability of concrete increases by using *Flaky aggregateRounded aggregateAngular aggregateAll f thesePozzolanic materials:*Asiacell..Decrease segregation of concrete

Answered: Methods that reduce the loss of mixing…

Methods that reduce the loss of mixing water from the surface of the concrete can be done by O Ponding or immersion O Saturated wet coverings Membrane-forming curing compounds O All of these

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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what is the aci design mix or proportioning of standard compressive ddesign strength values (without ad mixture or other supplementaries) of cement, water, ad aggregates and fine aggregates ratio for 3000 psi, 4000 psi and 5000 psi. please help me and if you searched for it pls inlcude the links here i want to read it
The design of a concrete mix requires 1173 kg/m3of gravel in dry condition,582 kg/m3of sand in dry condition, and 157 kg/m3of free water. The gravelavailable at the job site has a moisture content of 0.8% and absorption of1.5%, and the available sand has a moisture content of 1.1% and absorptionof 1.3%. What are the masses of gravel, sand, and water per cubic meter thatshould be used at the job site?
Design a concrete mix for the following conditions and constraints using the absolute volume method:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebars = 40 mmMinimum cover over rebars = 40 mmStatistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples)Only air entrainer is allowedAvailable MaterialsAir EntrainerManufacturer specification 6.3 ml/1% air / 100 kg cementCoarse aggregate19 mm nominal maximum size, river gravel (rounded)Bulk oven dry specific gravity = 2.55, Absorption = 0.3%Oven dry-rodded density = 1761 kg/m3Moisture content = 2.5%Fine aggregateNatural sandBulk oven-dry specific gravity = 2.659, Absorption = 0.5%Moisture content = 2%Fineness modulus = 2.47
UUURRRGGGEEENNNTTT PLEASE You are working on a concrete mix design that requires each cubic yard of concrete to have a 0.43 water–cement ratio, 2077 lb/yd3 of dry gravel 244 lb/yd3 of water, and 4% air content. The available gravel has a specific gravity of Ggravel = 2.6, moisture content of 2.3% and absorption of 4.5%. The available sand has a specific gravity of Gsand = 2.4, a moisture content of 2.2% and absorption of 1.7%. Air entrainer is to be included using the manufacturers specification of 0.1 fl. oz / 1% air / 100 lb cement. For each cubic yard of concrete needed on the job, calculate the weight of cement, moist gravel, moist sand, and water that should be added to the batch. Summarize and total the mix design when finished.
You are working on a concrete mix design that requires each cubic yard ofconcrete to have 0.45 water–cement ratio, 1963 lb/yd3of dry gravel, 4% aircontent, and 565 lb/yd3of cement. The available gravel has a specific gravity of Ggravel = 2.7, a moisture content of 1.6%, and absorption of 2.4%. Theavailable sand has a specific gravity of Gsand = 2.5, a moisture content of4.8%, and absorption of 1.5%. For each cubic yard of concrete needed onthe job, calculate the weights of cement, moist gravel, moist sand, and waterthat should be added to the batch. Summarize and total the mix design whenfinished (don’t include air entrainer in summary)
(a) The following data are collected for a modulus ofrupture test on a refractory brick (refer to Equation6.10 and Figure 6,14):F= 5.0 x 10 N.L= 200 mm,h= 130 mm.h= 80 mm.Calculate the modulus of rUpture: (b) suppose thatyou are given a similar rolracioty with the fallSpensin and same dimensions except that its heightSit ts only 60 mm. What would be the load (F) necesary to break this thinner refractory?
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Working on major construction project that requires considerable amounts of concrete to be used,you are asked to design a concrete mix following the BRE methodology. All the necessary tables forthis can be found in the Appendix. The concrete mix specifications are:o Characteristic compressive strength of 35 N/mm 2 at 28 days.o Failure rate of 2%o Previous control data yielded a standard deviation of 10 N/mm 2o CEM-I 42.5o Air-entraining is not requiredo Maximum water to cement ratio 0.40o Minimum cement content 390 kg/m 3o Required slump 50 mmo Coarse aggregate: Crushed maximum size 20mmo Fine aggregate: Uncrushed with 90% passing 600 μm sieveo Relative density of aggregates: 2.5o Coarse aggregate has 4% moistureo Fine aggregate is dry and has 1.2% absorption.o Volume of the required trial mix: 0.090 m 3Following the BRE step-by-step process estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities
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Design the concrete mix according to the following conditions:Design Environment• Concrete slabo Subjected to freeze and thaw.o Required design strength = 21 MPao Slab thickness = 300 mm.o Statistical data indicate a standard deviation of compressive strengthof 1.7 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Available Materials:o Air entrainer:▪ Manufacture specification is 9.5 mL/1% air/100 kg cement.o Coarse aggregate:▪ 25 mm nominal maximum size▪ Crushed stone▪ Bulk oven-dry specific gravity = 2.573▪ Absorption = 2.8▪ Oven-dry rodded density = 1922 kg/m3▪ Moisture content = 1o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.540▪ Absorption = 3.4▪ Moisture content = 4.5▪ Fineness modulus = 2.60o Cement:▪ Type I Cement▪ Specific gravity = 3.15…
Kindly answer both a and b Other wise leave it... Give me both answer I don't want single answer.. Thank you a. what is the effect of water content on flowability, segregation and strength of concrete? give your reasons? b. For a given workability, how the aggregate grading may affect the water requirement of concrete.