The relative amounts of the four chemicals in the final cement depends on the desired properties ofthe cement concrete. The table below gives the typical compound composition of different types ofPortland cementsCompound CompositionNo.C3SC,SC3AC4AF160139.84040432650512450241154233513Depending on the properties of the different chemicals and their relative composition,identify the high early strength (HE) and low-heat (LH) cements from the table. Give detailexplanation for your answer

High Early Strength cement- For gaining strength in the early stages proportion of C3S is increased.…

The relative amounts of the four chemicals in the final cement depends on the desired properties of the cement concrete. The table below gives the typical compound composition of different types of Portland cements Compound Composition No. C;S C,S C3A C4AF 1 60 13 9. 8 2 40 40 4 9 3 26 50 12 4 50 24 11 8 5 42 33 13

The relative amounts of the four chemicals in the final cement depends on the desired properties of the cement concrete. The table below gives the typical compound composition of different types of Portland cements Compound Composition No. C;S C,S C3A C4AF 1 60 13 9. 8 2 40 40 4 9 3 26 50 12 4 50 24 11 8 5 42 33 13

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The composition of an air-entrained concrete is given below: Water: 184 kg/m³ Ordinary Portland cement (OPC): 368 kg/m³ Sand: 606 kg/m³ Coarse aggregate: 1155 kg/m³ Assume the specific gravity of OPC, sand and coarse aggregate top be 3.14, 2.67 and 2.74, respectively. The air content is litres/m³.
The following information is available from a specific gravity test on fine aggregate: wt of SSD sand = 509 g wt of pycnometer plus sand plus water = 2665g wt of pycnometer plus water = 2329 g wt of oven dry sand = 491 g Calculate the bulk specific gravity (SSD), bulk specific gravity, apparent specific gravity, and absorption (dry) of the material.
A sieve analysis test was performed on a sample of coarse aggregate and produced the following results. Referring to ASTM C33, what is the closest size number, and does it meet the gradation for that standard size?
Question 4
Determine the suitability of the aggregate, with the gradation tabulated below, for use in Portland cement concrete. Review the grain size distribution to determine if it meets all of the relevant specifications for use in concrete (i.e. gradation limits, fineness modulus and % fines). Refer to the specification for concrete aggregates (Table 7 – 10) below: Grain Size (mm) % Passing Cum %Retained 25 100 19 100 12.5 100 9.5 100 4.75 95 2.36 85 1.18 55 0.6 30 0.3 15 0.15 8 0.075 6
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The requirements and material properties of an air entrained concrete mix are given below. Calculate the weights of the components of 1 m3 of concrete. Water content: 200 kg/m3 Air content: 7.5% W/C: 0.45 (By Weight). Dry aggregate volume in 1 m3 concrete mixture: 0.44 m3 Specific Gravity (g/em3 ) water absorption capacity (%) Total Moisture (%) Cement 3.15 Fine aggregate (saturated surface dry) 2.65 1.3 5.5 Coarse aggregate (saturated surface dry) 2.7 0.5 1.5 Dry unit weight of coarse aggregate is 1,500 kg / m3. 'kind
5.6 Define the following terms: a. Saturated surface-dry condition of aggregates b. Absorption of aggregates c. Free water on aggregates d. Referring to Figure 5.9, which portion of the water in the aggregate reacts with the cement in the PCC mix?
4 pts Question 23 What is the fineness modulus of this aggregate? % Cumulative Retained Retained Mass 0% Sieve Size (US) (g) Retained Passing 1" 3/4" 1/2" 3/8" # 4 650 18.3 700 19.7 632 17.8 175 4.9 # 8 200 5.6 #16 W 150 4.2 #30 125 3.5 #50 331 9.3 #100 288 8.1 #200 250 7 Pan 50 1.4 Total 3551 O 5.20 O 1.57 O 3.89 O 6.50
The two main raw materials needed for manufacturing ordinary portland cement are
Which of the following materials is/are a good weight additive for cement (include both weight increase and weight reduction)? a. Bentonite b. Barite c. Hematite d. Sand e. Nitrogen
The cement content of a concrete is 375 kg/m3 and the w/c ratio is 0.46. At a specific moment of the cement hydration, the degree of hydration is 0.80. Calculate the volume (dm/m³) of the following: (i) chemically bound water, (ii) gel water and (iii) capillary water A concrete sample was extracted from a structure and dried at 105 °C in which 80 kg/m3 of water evaporated. The degree of hydration (a) was determined to be 0.5. The mix design of the concrete was 1:6.0:0.6 (Cement:Aggregates:Water mix ratio by weight) and the target air content was 3 %. a) How much of the water had been evaporated prior to drying at 105°C? b) What were the volume of (i) un-hydrated cement, (ii) solid part of cement gel, (iii) gel water, (iv) contraction pores, and (v) capillary pores at the time of sampling?