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Who invented Portland cement and in which year?

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in Basic Civil Engineering by (111k points)
Who invented Portland cement and in which year?

(a) William Aspdin, 1824

(b) William Aspdin, 1840s

(c) Joseph Aspdin, 1840s

(d) Joseph Aspdin, 1824

I got this question in an interview for internship.

My question is taken from Properties of Cement topic in chapter Materials for Construction of Basic Civil Engineering

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Correct answer is (b) William Aspdin, 1840s

For explanation I would say: Joseph Aspdin patented Portland cement in 1824.  William Aspdin, his son is regarded as the inventor of modern Portland cement due to his developments in 1840s.

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