# Concrete Technology Questions and Answers – Gel Space Ratio

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Gel Space Ratio”.

1. What is the gel/space ratio?
a) Volume of water to the volume of cement
b) Volume of the hydrated cement paste to the sum of volumes of the hydrated cement
c) Volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores
d) Volume of gel to the volume of space present in the concrete

Explanation: This ratio is defined as the ratio of the volume of the hydrated cement paste to the sum of volumes of the hydrated cement and of the capillary pores.

2. Who has established the relation between the strength and gel/space ratio?
a) Abrams
b) Power
c) Brownyard
d) Power and Brownyard

Explanation: Powers and Brownyard have established the relationship between the strength and gel/space ratio.

3. Power showed that the strength of concrete bears a specific relationship with the gel/space ratio. He found the relationship to be __________
a) 240x3
b) 140x3
c) 240x2
d) 140x2

Explanation: Power’s experiment showed that the strength of concrete bears a specific relationship with the gel/space ratio. He found the relationship to be 240 x3.

4. What does 240 in power’s experiment stand for?
a) Gel space ratio
b) Water cement ratio
c) Intrinsic strength of gel
d) Extrinsic strength of gel

Explanation: Power’s experiment showed that the strength of concrete bears a specific relationship with the gel/space ratio and the relationship comes to be 240 x 3 where 240 represents the intrinsic strength of the gel.

5. What does x3 in power’s experiment stands for?
a) Gel space ratio
b) Water cement ratio
c) Intrinsic strength of gel
d) Extrinsic strength of gel

Explanation: Power found the relationship to be 240 x3, where the value of x is the gel/space.
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6. What unit is present with the 240?
a) Pa
b) MPa
c) GPa
d) KPa

Explanation: During Power’s experiment, the intrinsic strength of the gel was comes out to be 240MPa.

7. Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here C stands for?
a) Weight of cement in kg
b) Weight of cement in g
c) Volume of gel
d) Volume of mixing water in ml

Explanation: According to Power and his experiment, the C is the weight of cement in grams.

8. Gel/Space ratio = x = Volume of gel / Space available = 0.657 C / 0.319 C+ Wo. Here Wo stands for?
a) Weight of cement in kg
b) Weight of cement in g
c) Volume of gel
d) Volume of mixing water in ml

Explanation: According to Power and his experiment, Wo is the volume of mixing water in ml.

9. According to figure, what is the approximate value of strength of 50mm cube in MPa for gel-space ratio .6?

a) 20
b) 40
c) 60
d) 80

Explanation: It is clearly seen from the fig that the corresponding value of strength for gel space ratio .6.

10. Referring to the graph below, what is the approximate value of strength of 50mm cube in MPa for gel-space ratio .8?

a) 20
b) 40
c) 60
d) 80

Explanation: It is clearly seen from the fig that the corresponding value of strength for gel space ratio .8.

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