Q21GATE 2008MCQ

The specific gravity of paving bitumen as per IS:73-1992 lies between

Q22GATE 2008MCQ

A combined value of flakiness and elongation index is to be determined for a sample of aggregates. The sequence in which the two tests are conducted is

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Q23GATE 2007MCQ

The consistency and flow resistance of bitumen can be determined from which of the following ?

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Q24GATE 2007MCQ

Match the following tests on aggregate and its properties.

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Q25GATE 2006MCQ

If aggregate size of 50-40 is to be tested for finding out the portion of elongated aggregates using length gauge, the slot length of the gauge should be

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📖 Explanation

Slot length for elongated aggregate

\begin{aligned} &=1.8 \times \text { mean dimension } \\ &=1.8 \times \left(\frac{50+40}{2}\right)=81 \mathrm{mm} \end{aligned}

For flakiness index, the slot size $=0.6 \times \left(\frac{50+40}{2}\right)=27 \mathrm{mm}$

Q26GATE 2005MCQ

Group-I contains some properties of bitumen. Group-II gives a list of Laboratory Tests conducted on bitumen to determine the properties. Match the property with the corresponding test.

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Q27GATE 2005MCQ

Bituminous concrete is a mix comprising of

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Q28GATE 2004MCQ

A Marshall specimen is prepared for bituminous concrete with a bitumen content of 5 percent by weight of total mix. The theoretical and the measured unit weight of mix are 2.442 $g/cm^{3}$ and 2.345 $g/cm^{3}$ , respectively. The bitumen has a specific gravity of 1.02. The percent voids in mineral aggregate filled with bitumen (VFB) are

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📖 Explanation

Percentage air voids,

\begin{aligned} V_{v} &=\left[\frac{G_{t}-G_{m}}{G_{t}}\right] \times 100 \\ &=\frac{2.442-2.345}{2.442} \times 100=3.97 \% \end{aligned}

Void filled with bitumen,

\begin{aligned} V_{b} &=G_{m} \times \frac{W_{b}}{G_{b}}=2.345 \times \frac{5}{1.02} \\ &=11.5 \% \\ \mathrm{VMA} &=V_{v}+V_{b}=3.97+11.5=15.461 \% \\ \therefore \quad \mathrm{VFB} &=\frac{V_{b} \%}{\mathrm{VMA} \%} \times 100 \\ &=\frac{11.5 \%}{15.47 \%} \times 100 \% \\ &=74.33 \%=74.3 \% \end{aligned}

Q29GATE 2003MCQ

Group-I below gives a list of physical properties of aggregates which should be determined to judge their suitability in road construction. Group-II gives a list of laboratory tests which are conducted to determine these properties. Match Group-I with Group-II.

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Q30GATE 2003MCQ

In the Marshall method of mix design, the coarse aggregates, fine aggregates, filler and bitumen, having respective specific gravities of 2.62, 2.72, 2.70 and 1.02 are mixed in the ratio of 55, 34.6, 4.8 and 5.6 percent, respectively. The theoretical specific gravity of the mix would be

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📖 Explanation

The theoretical specific gravity of the mix is given by, $G_{t}=\frac{100}{\frac{55}{2.62}+\frac{34.6}{2.72}+\frac{4.8}{2.70}+\frac{5.6}{1.02}}=2.44$

Q31GATE 2002MCQ

Bitumen is derived from

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Q32GATE 2001MCQ

The minimum value of CBR(%) required for granular sub-base as per Ministry of Surface Transport (MOST) specification is

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