Concrete Materials Final Spring 2012
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| Low temperature curing results in high early strength but lower ultimate | False
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| The main hydration compound responsible for strength of Portland cement concrete is ettringite | False
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| The use of air-entraining admixture would typically allow the reduction of the w/c ratio required for a given work ability | True
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| Effectiveness of a mineral admixture as a pozzolanic material can be assessed through quantifying lime consumption of that admixture when incorporated with cement in a mix | True
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| Increasing the fineness modulus of sand increases paste requirement |
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| Increasing maximum aggregate size results in a decrease in the compressive strength of concrete in lean mixes while for mix mixtures the opposite is true | False
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| OD AND SSD are considered reference moisture states for aggregates | True
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| In order to increase sulfate durability of a structure, a portland cement of high tricalcium aluminate content should be selected. | False
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| The main contributiion to heat evolution during the hydration of Portland cement is primarily from C2S hydration | False
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| In Preparing a trial batch for a specific concrete mix, it is important to batch by mass as opposed to batching by volume | True
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| The initial set of a cement paste can be correlated to the end of induction stage of tricalcium sillicate hydration |
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| For mass elements or mass structures it is important to use Portland cement that is high in its tricalcium aluminate and tricalcium silicate content | False
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| In order to improve durability of reinforced structures, it is important to incorporate a mineral admixture such as silica fume or fly ash | True
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| The primary focus of civil engineers in designing a structural element is to aim for the highest compressive strength without accounting for durability | False
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| For mass concrete, cement fineness has no consequences on structure durability | False
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| The heat of hydration of Portland Cement paste will not be affected by a large increase in cement fineness | False
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| For the same workability, a low w/c ratio design will yield concrete that is strong a durable | True
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| Reducing the transition zone in concrete has no effect on concrete strength | False
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| The pH of the pore solution is affected by the alkali content of Portland cement |
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| It is important to limit periclase in portland cement because it can generate unsoundness in concrete elements | True
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| The amount of sulfur trioxide in portland cement is not of significance on a sulfate durability | False
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| On hydration anyhydrous portland cement doubles its volume | True
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| The moisture content of aggregates has to be accounted for to ensure a constant w/c ratio in making concrete trial batches | True
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| Bogue calculations give an accurate account of the crystalline phases in portland cements | False
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| For lean mixes, increasing nominal maximum aggregate size increases the compressive strength of the concrete | True
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