what are the causes of bad production of concrete products

Efflorescence in concrete; causes, prevention and repairing …

Identify and address the root causes of water infiltration, such as improving drainage or fixing leaks. 7. Repair Cracks: Fill any cracks in the concrete to prevent water penetration, which can contribute to efflorescence. 8. …

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Circular solutions vital to curb enviro harm from cement and concrete

The concrete industry is a major carbon emitter and polluter, with severe human health impacts. But circular solutions, including electrifying cement plants, making low-carbon cement, and bio ...

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Concrete Bleeding

Bleeding isn't always bad. It lowers the water-cement ratio and densifies the concrete. But concrete that bleeds too fast or too long can cause a number of problems. Even if bleeding isn't excessive, finishing concrete at the wrong time causes a different set of bleeding-related problems. THE BLEEDING PROCESS. Almost all freshly placed …

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Causes of Variation in Concrete Yield

A contractor's operation can create what appears to be a concrete shortage or underyield. Contractors should investigate possible such causes for apparent concrete shortages as: deflection or distortion of wall forms by the pressure of the concrete; irregular subgrades; or forms placed at the wrong elevations or locations.

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Characterization and Hazard Identification of Respirable …

Concrete dust could have more potential to cause silicosis compared to cement, as it contains >30 wt.% crystalline silica, while cement dust contains mainly calcium silicates. Metal content and other compounds in cement and concrete dust pose a risk of lung damage and other secondary impacts.

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Quality Management to continuous improvements in …

Concrete production process needs continuous improvements and updating process. ... 6 4 4 3 3 7 6 3 6 4 4 4 3 4 3 6 5 In the table above the biggest occurrence number the faults or stop the plant during production and bad communications and awareness of management. 4.3.3 FMEA ANALYSIS It is the systematic way to monitoring, reporting, …

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Relationship between CO2 Emissions from Concrete Production …

Many production activities contribute to environmental degradation by emitting greenhouse gases. The construction sector, one of the main sectors contributing to a country's economic growth, also contributes to greenhouse gas emissions (especially CO2). Concrete, one of the most commonly used materials in this sector, is a source of …

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What Causes Cement Balls?

How can we eliminate the cement balls that we've recently discovered in our concrete? This problem seemed to start after we recently installed a new batch controller on our transit-mix plant. Before that, we had operated the plant manually. We've always monitored slump and mix consistency closely. Also, since the problem has started, we …

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Cut Carbon and Toxic Pollution, Make Cement …

Cement is incredibly dirty to produce: while it only constitutes 10-15% of concrete's mass in a typical mix, it accounts for up to 90% of its greenhouse gas (GHG) emissions (Figure 1).

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Determining Causes of Concrete Cracking

I do a lot of troubleshooting on residential concrete flatwork -- mainly sidewalks or driveways. Is there a way to tell the difference between structural cracking caused by overload or soil movement, and nonstructural cracking caused by volume changes related to drying shrinkage or thermal contraction? I sometimes suspect that …

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Impacts of booming concrete production on water resources …

Concrete production is linked to GHG emissions, with associated burdens to an ever-changing climate, and this research shows that concrete production is also …

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Core Strength Variation of In-Place Concrete

Concrete strength varies within a single element. Tests indicate two apparent causes of strength variation: strength increase at the bottom attributed to greater static pressure caused by the concrete above and strength decrease at the top attributed to higher water-cement ratios as a result of bleedwater.

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How electricity could help tackle a surprising …

But there's a climate threat lurking in those ubiquitous gray slabs. Cement production accounts for more than 7% of global carbon dioxide emissions—more than sectors like aviation, shipping ...

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Concrete Safe Ice Melt Products That Won't Cause Damage

There are a number of ice melt products that cause less harm to concrete. A larger number of people tend to think that concrete is impervious to almost every substance. ... While it is not bad, it is not the most sought-after way to deal with slippery surfaces. Unfortunately, not using a concrete-safe ice melt will pose a more significant ...

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Solving Exposed Aggregate Concrete Problems: A …

Causes of Exposed Aggregate Concrete Problems. Understanding the causes of exposed aggregate concrete problems is crucial for effective troubleshooting and prevention. It is important to delve into the various factors that can contribute to these issues. One common cause of cracking is inadequate curing, where the concrete needs more moisture ...

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Cement and Concrete: Environmental …

Concrete and other cementitious materials have both environmental advantages and disadvantages. This article takes a look at how these materials are made, then reviews a number of environmental …

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Why is concrete production bad for the planet? Are there …

Moreover, the extraction of raw materials for concrete causes habitat destruction, landscape alteration, and can deplete water reserves and other natural resources. The demand for sand, a key component in concrete, has led to illegal and environmentally destructive mining practices around the world as well.

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Controlling Shrinkage

Concrete with stone aggregates performed much better than mixes with gravel aggregates. Ternary mixes displayed higher concrete strengths. Fuller-optimized aggregate concrete mixes fell in the center of the rankings for compressive strength. Flexural strength. From the highest flexural strength to the lowest was only a difference …

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What Causes Efflorescence and How do You Remove it?

Joe Nasvik An example of extreme efflorescence. The concrete was placed, colored, and stamped shortly before winter. The extended period of water movement through the concrete to the surface brought chemicals to the surface where they combined with carbon dioxide from the air to produce calcium carbonate, the white …

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Environmental impact of cement production and Solutions: …

This paper reviews the impact of cement industry towards the global environment and solutions to the problem. The increasing harvesting of raw materials for …

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Concrete Surface Blistering -- Causes and Cures

Concrete workers hold a wide range of opinions about what causes fresh concrete to blister occasionally, especially during the cooler seasons. Blistering occurs when air gets trapped in the concrete and can't break out of the seal that may be created during finishing operations or caused by a rapidly setting surface.

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A surprising contributor to climate change: concrete

As much as 10 percent of global CO2 emissions come from the production of concrete. So scientists and engineers are looking to reduce its environmental impact.

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Surface Crazing

Q: We are dealing in a dispute between a contractor and an owner over the placement of a post-tensioned slab that has exhibited some craze cracking. The owner does not like the cracks. Are these cracks a structural problem? A: Craze cracks are small pattern cracks occurring in a slab surface. They are associated with early surface drying …

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Segregation in Concrete: 2 Types, Causes, Effects, and How …

Placing of concrete mix: The method of placing concrete mix can also cause segregation, especially if the free fall distance is long, or the consolidation is insufficient. Settlement: During transportation, the heavy aggregates may settle at the bottom of the concrete mix causing a non-uniform mix.

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Causes of Concrete Cracks: Why Does It Happen?

One of the primary culprits behind concrete cracks is plastic shrinkage. During the initial curing process, water within the concrete mixture evaporates, leading to the formation of voids between solid …

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Concrete Bleeding Good or Bad?| Concrete Construction …

If the concrete is to be revibrated, this will permit the contractor to use a concrete mix which is highly placeable; and yet the bleeding of the water from the mix will reduce the water content of the mix to a reasonable level, and the revibration will thoroughly reconsolidate the concrete.

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Concrete is Terrible for the Environment (Here's Why!)

Concrete Dust Causes Air Pollution. Even while concrete is being mixed it can cause environmental damage. The mixing process tends to send toxic concrete powder up into the air. In some parts of the world where lots of concrete is mixed, this can become one of the most damaging air pollutants.

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Climate change: The massive CO2 emitter you may not …

Concrete is the most widely used man-made material in existence. It is second only to water as the most-consumed resource on the planet. But, while cement - the key ingredient in concrete - has ...

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8 Common Defects in Concrete Structures & How to Prevent …

Additional factors that contribute to bad design detailing. Corners of re-entrants. Sections undergo abrupt changes. Inadequate detailing of joints. Limits on deflection. Drips and scuppers are poorly detailed. Drainage is insufficient or improper. Expansion joints with inadequate detailing; Concrete Defects: Types, Causes, and Prevention

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Solving Cement's Massive Carbon Problem

1. Mine and Grind Limestone. How it works: Room to improve: Start with basalt instead of limestone or use "carbon-negative limestone" produced with waste CO 2 (step 2), reducing emissions...

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