choose the correct option please Silica fume admixture increase concrete strength up to  60 MPa  120 MPa 150 MPa 200 MPa

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To evaluate the effect of a certain admixture on the flexure strength of concrete, two mixes were prepared, one without admixture and one with admixture.Three beams were prepared of each mix. All the beams had a cross section of 4 in. * 4 in. and a span of 12 in. The third-point loading flexure strength test was performed on each beam after 7 days of curing. The loads at failure of the beams without admixture were 6044, 5071, and 5934 lb, while the loads at failure of beams with admixture were 7299, 7305, and 6983. Determine:a. The modulus of rupture of each beam in psi.b. The average moduli of rupture of the beams without and with admixture.c. The percent of increase of the average modulus of rupture due to adding the admixture.

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The properties of hardened concrete also affected by curing process. Analyze any possible defect occurred in concrete without curing

Lightweight Concrete Present and Future applications

What is the value of the Whitney stress block parameter, β1β1, for 6000 psi concrete?

Which of the options are correct for a 3m³ of concrete having design mix proportion of 1:2:7 (by volume) A Volume of cement required = 0.318 m³ B No. of cement bags required = 15 C D Volume of coarse aggregate = 2.5 m³ Volume of water required = 1m³

Which of the following is NOT a benefit of using SCMs? Increase required concrete curing time Increase long term strength Reduce permeability Increase the resistance to chloride ions

Given grade 60 steel rebar and 4000 psi normal-weight concrete, (a) What is the yield strength of steel? (b) What is the modules of elasticity of the steel? (c) What is the steel strain at the yield point? (d) What is the concrete compressive strength? (e) What is the concrete's modulus of rupture per ACI318-19? (f) What is the concrete' ultimate compressive strain?