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Does sizes of aggregates affect the compressive strength of concrete?
Wiki User
∙ 12y ago
- Larger the size of aggregate will decrease strength of the concrete because surface area of this aggregate is low.
- Lesser the size of the aggregate will lead to increase the strength of the concrete.
- Well graded aggregate have all size of particles hence particle interferance is neglected,thus strength of concrete is more.
Wiki User
∙ 12y ago
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How does the fineness modulus of aggregates affect the strength of concrete?
how does the fineness modulus of aggregate affect the strength of concrete
What factors affect the compressive strength of concrete?
water /cement ratio
What is the setting and hardening of cement?
Setting of cement is the initial solidifying of the cement. I presume you will not be using a cement material by itself, but by mixing in aggregates and fines to create 'concrete' I will continue this answer talking about concrete but much still applied to a simple cement mortar also. Depending on temperature (warm fast, cold slow) initial set will be between 2 and 24 hours. This will result in a concrete material that can easily be marked with a fingernail. Once the concrete has set, the concrete goes through a process called curing or 'hardening' where the pozzolanic constituents of the concrete 'hydrate' (react with the water) to create a hard material. This will continue for the life of the concrete but the most significant strength gains will be noticed within the first 28 days and this is the strength normally taken as the design strength of the concrete. It can be expected in ideal conditions with warm air and a light breeze in the air, for the concrete to achieve 30% of it's 28 day strength in 1 day 60-80% in 3 days 80-100% in 7 days and 100-% in 28 days Many factors will affect this. temperature will have a large impact. additives such as retarders and accelerators can be added to slow and speed up the hardening process respectively.
What is the Test Procedure to Determine Compressive strength of Hollow Blocks?
Testing the compressive strength of hollow blocks typically follows a standard procedure to ensure accurate and reliable results. Here's a general outline of the test procedure: **Sample Preparation:** Select representative samples of hollow blocks from the production batch. Ensure the samples are free from defects and have been cured appropriately. **Conditioning:** If the blocks are not already at room temperature, allow them to acclimate to the testing environment. **Equipment Setup:** Set up the compression testing machine according to standards or specifications. Ensure the machine is calibrated and in good working condition. **Sample Identification:** Mark each sample with a unique identifier for accurate tracking of results. **Moisture Content Check (if applicable):** Determine and record the moisture content of the samples, especially if it can affect the compressive strength. **Testing Procedure:** Place the hollow block specimen on the compression testing machine. Align the specimen so that the load is applied evenly on the blocks. Gradually apply a compressive load at a uniform rate until failure occurs. Record the maximum load at failure and note any signs of distress in the specimen. **Calculation of Compressive Strength:** Calculate the compressive strength using the formula: Compressive Strength = Maximum Load / Cross-sectional Area of the Block. **Reporting:** Document all relevant information, including sample identification, moisture content, and compressive strength values. Prepare a test report with details of the testing procedure, equipment used, and results obtained. **Quality Control:** Compare the results with specified standards or requirements to ensure the hollow blocks meet the desired compressive strength. **Data Analysis:** Analyze the data for any trends, variations, or anomalies that may indicate issues with the production process. **Documentation and Archiving:** Keep a record of the test results and associated documentation for future reference or quality control purposes. It's crucial to follow specific standards or guidelines relevant to the type of hollow blocks being tested, as procedures may vary based on factors such as block dimensions, material composition, and testing conditions. Always adhere to industry standards or applicable building codes for accurate and meaningful results.
What are the pros and cons on reinforced concrete?
Pros: 1.Reinforced concrete has high strength and durability and is widely used in buildings and bridges. 2.Can be made into various shapes and sizes 3.Have fire resistance 4.Long service life and low maintenance cost Cons: 1.Relatively expensive 2.Has high compressive strength, but weak tensile strength 3.Not good-looking If you work with concrete, you must understand that there are many factors that may affect the quality of concrete： 1.Mud content in the sand 2.Gradation of stone particles 3.Mud content of the stone 4.Needle-like particles content 5.Stone size 6.Stone powder content 7.Content of weathered stone 8.Water quality 9.Water-cement ratio 10.Curing temperature and humidity Concrete age 12.Construction method If you want to know about the concrete crushing production line, FTM Machinery can provide you with complete equipment and high-quality services.
How does the fineness modulus of aggregates affect the strength of concrete?
how does the fineness modulus of aggregate affect the strength of concrete
How does fineness modulus of aggregates affect the strength of concrete?
how does the fineness modulus of aggregate affect the strength of concrete
What factors affect the compressive strength of concrete?
water /cement ratio
Why fineness modulus of coarse aggregates is more than that of fine aggregates?
how does the fineness modulus of aggregate affect the strength of concrete
How does the moisture affect the strength values of concrete?
the moisture of concrete is main strength for reinforced concrete structure
How does Curing of concrete affect its design strength?
It increases its strength, generally speaking.
How the moisture content of the aggregates obtainable at site affect the water content ratio specified?
Obviously, if the aggregates are in a surface wet condition, meaning the moisture content is greater than the absorption, that surface water increases the water-to-cement ratio and affects strength and durability.
What factors affect the workability of a concrete mix?
1),water content 2),mix praportions 3),size of aggregates 4),shape of aggregate 5),surface texture 6),grading of aggregates 7),use of admixture
How coarse aggregate shape affect workability?
Aggregates with angular particles are more difficulties to compact than one with rounded particles and therefor,requires more water in the mix to act as alubricant.this additional water, on evaporation ,tends to leave void spaces in the hardened concrete made with rounded aggregates particles which requires less water for compaction.the nature of the particles of an aggregates will also affect workability.(
What difficulties arise in the use of aggregates which absorb water How theyovercome (a) in the laboratory and (b) on the job?
When using aggregates that absorb water, several difficulties can arise. These difficulties include: Increased water demand: Aggregates that absorb water can increase the water demand in a concrete mix. This can lead to challenges in achieving the desired water-cement ratio and can affect the strength and durability of the concrete. Reduced workability: The absorption of water by aggregates can reduce the workability of the concrete, making it more difficult to place and finish. This can result in issues such as segregation, poor compaction, and difficulty in achieving the desired surface finish. To overcome these difficulties, the following approaches can be taken: (a) In the laboratory: Pre-wetting aggregates: One way to overcome the increased water demand and reduced workability is to pre-wet the aggregates before mixing them with cement and other ingredients. This ensures that the absorbed water in the aggregates is taken into account during the mix design process. It helps maintain the desired water-cement ratio and improves workability. Adjusting mix proportions: The mix proportions can be adjusted by considering the absorption characteristics of the aggregates. By accounting for the water absorption capacity of the aggregates, the required water content can be determined to achieve the desired consistency and workability. (b) On the job: Proper storage and handling: Aggregates should be stored in covered areas or protected from rainwater to prevent additional water absorption. Proper handling practices during transportation and on-site storage can help minimize the absorption of water by aggregates. Moisture control: On-site, measures can be taken to control moisture levels. For example, if the aggregates are excessively dry, they can be sprayed with water to ensure they have the right moisture content before mixing. Conversely, if the aggregates are already saturated, adjustments can be made to the mix design to compensate for the absorbed water. By implementing these strategies, the difficulties associated with the use of aggregates that absorb water can be mitigated, ensuring better concrete performance both in the laboratory and on the job.
What is the setting and hardening of cement?
Setting of cement is the initial solidifying of the cement. I presume you will not be using a cement material by itself, but by mixing in aggregates and fines to create 'concrete' I will continue this answer talking about concrete but much still applied to a simple cement mortar also. Depending on temperature (warm fast, cold slow) initial set will be between 2 and 24 hours. This will result in a concrete material that can easily be marked with a fingernail. Once the concrete has set, the concrete goes through a process called curing or 'hardening' where the pozzolanic constituents of the concrete 'hydrate' (react with the water) to create a hard material. This will continue for the life of the concrete but the most significant strength gains will be noticed within the first 28 days and this is the strength normally taken as the design strength of the concrete. It can be expected in ideal conditions with warm air and a light breeze in the air, for the concrete to achieve 30% of it's 28 day strength in 1 day 60-80% in 3 days 80-100% in 7 days and 100-% in 28 days Many factors will affect this. temperature will have a large impact. additives such as retarders and accelerators can be added to slow and speed up the hardening process respectively.
What are the chemical and physical properties of cement?
Three varieties of the strength of cement are measured – compressive, tensile, and flexural. Several factors affect the strength, such as water-cement ratio, cement-fine aggregate ratio, curing conditions, size and shape of a specimen, the manner of molding and mixing, loading conditions, and age. I hope it will assist you.
