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Why Sea Sand Cannot Be Directly Used For Concreting

How to Add Concrete to Existing Concrete (with Pictures

Feb 23 2020How to Add Concrete to Existing Concrete No matter how strong a slab of concrete seems it will wear out over time Imperfections form when concrete hardens or sinks into the ground Adding fresh concrete is a common way to level out old Get price Get Price

Can I use just any sand for blasting?

In the past blast cleaning operations were done with silica sand The term sandblasting originates from those days Nowadays it's clear that exposure to respirable crystalline silica during sandblasting can cause a serious or even fatal respiratory disease called Silicosis a scarring and hardening of the lungs In most countries it is now forbidden to use abrasives which contain more than Get price Get Price

Pavers vs Concrete

Pavers are generally easy to clean but not as easy as concrete since they are not a single slab One of the biggest concerns with concrete and pavers is weeds as they often grow in between cracks and the pavers When pavers are placed polymer sand is often used to help interlock the pavers which provides more durability Get price Get Price

Floor Leveling On Concrete

Additionally some floating floor manufacturers in previous years have also suggested the use of clean and dry masonry sand If in doubt I highly recommend contacting them directly before considering such Any method regardless of how effective it is may be grounds for voiding a warranty Can be used with floating floors on concrete Get price Get Price

What is Shoring? Types of Shoring and When it Used

What is Shoring? Shoring is the construction of a temporary structure to support temporarily an unsafe structure These support walls laterally Shoring can be used when walls bulge out when walls crack due to unequal settlement of foundation and repairs are to be carried out to the cracked wall when an adjacent structure needs pulling down when openings are to be newly made or enlarged in a Get price Get Price

Concrete Floor Problems

Yeah but if I don't put the sand layer in there it will take too long to finish the floor Yes that's true if you use crappy concrete with too much water in it The easy answer is don't use crappy concrete See water-to-cement ratio less than 0 5 above We actually have the opposite problem now in California Get price Get Price

Subgrades Subbases for Concrete Slabs

The weaker the subgrade or the heavier the loads then the thicker the slab needs to be Concrete strength also comes into play but most slab concrete is around 3000 to 4000 psi so it's not a major factor The tensile strength of concrete is typically taken as 10 to 15% of the compressive strength so only about 400 or 500 psi Get price Get Price


A DRYLOK Concrete Protector has a curing compound and can be used on new concrete or old concrete to control dusting It is a water sealer DRYLOK Floor Wall Masonry Waterproofer stops water from coming up through the concrete floors It is a waterproofer Q Can you use DRYLOK Concrete Protector over paint? Get price Get Price

Types and Causes of Concrete Deterioration

The exceptional durability of portland cement concrete is a major reason why it is the world's most widely used construction material But material limitations design and construction practices and severe exposure conditions can cause concrete to deteriorate which may result in aesthetic functional or structural problems Get price Get Price

What Surfaces You Can (and Cannot) Resurface with Epoxy

To coat epoxy that has set for longer than 12 hours you will need to sand the surface so that the next layer can adhere This is a light sanding and doesn't need to be too abrasive it simply provides an added assurance that the epoxy will coat properly For urethane be sure to sand the surface extremely well Get price Get Price

Concrete Slab Surface Defects Causes Prevention Repair

sand in the mix A reduction of 60 to 120 kg of sand per cubic meter of concrete Do not use concrete with a high slump excessively high air content or excess fines If concrete must be placed directly on polyethylene sheet or other vapor barriers Get price Get Price

Sand and Gravel in Concrete

Jan 30 2014This admixture is required in all concrete exposed to exterior elements Overall this makes a good general purpose mix for foundations and other structures While Portland cement is the standard for concrete mixtures the type of sand you use may vary Unwashed beach sand creates a mixture that isn't quite as strong as products made with sand Get price Get Price

Sand as fill?

May 29 2001Re Sand as fill? I work for a soil testing lab that deals daily with this type of material Sand can be used as a fill material with ease Just keep the moisture in the sand and it would be advised to top off with a six inch layer of sand clay so you can walk on it will pouring concrete Get price Get Price

Why is desert sand not used for construction?

Mar 14 2019Choose a sand which is pre washed or wash it and sieve it with a fine screen even it comes as pre-screened This sand is rounded like a desert sand but perhaps the comparison ends there Now let me try to answer why desert sand is not well suited for making concrete It is more rounded or spherical offering the least amount of surface area Get price Get Price

Concrete Finishing Techniques

Concrete is well-known as a versatile construction material used worldwide a myriad number of residential commercial and industrial applications Concrete carries its strength on the inside but its beauty on the outside this exterior appearance can be modified by use of various materials and techniques which will be described below Get price Get Price

Sea Water in or on Concrete

The effect depends on whether these materials are used as ingredients in concrete or merely come into contact with it In general good quality concrete is adequately resistant to the effects of sea water salt water salt and salt-bearing materials that come into contact with it externally Get price Get Price

Calcium Silicate Bricks or Sand Lime Bricks for Masonry

Calcium silicate bricks are made of sand and lime and popularly known as sand lime bricks These bricks are used for several purposes in construction industries such as ornamental works in buildings masonry works etc Sand lime bricks are popularly used in Get price Get Price

Aggregates for Concrete

cannot alone provide a basis for predicting the behavior of aggregates in service Visual inspection will often disclose weaknesses in coarse aggregates Service records are invaluable in evaluating aggregates In the absence of a performance record the aggregates should be tested before they are used in concrete The most commonly used Get price Get Price

Sand Grains from Around the World!

Sand is a common material found on beaches deserts stream banks and other landscapes worldwide In the mind of most people sand is a white or tan fine-grained granular material However sand is much more diverse - even beyond the pink sand beaches of Bermuda or the black sand beaches of Get price Get Price

Effect Of Mixing Salt Water In Concrete

Oct 31 2012Of course sea walls are corroded by much more than salt such as sand and gravel kicked up and splashed against the concrete Salt does not chemically react with hardened concrete Salt does however lower the freezing point of water attract moisture and increase pressure of frozen water San Diego General Contractors Get price Get Price

How Does Salt Water Rust Metals?

TL DR (Too Long Didn't Read) Rusting is a common form of corrosion which occurs when metal atoms react with their environment Salt water does not make a metal rust but it accelerates the rusting process because electrons move more easily in salt water than they do in pure water Get price Get Price


Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity It contains short discrete fibers that are uniformly distributed and randomly oriented Fibers include steel fibers glass fibers synthetic fibers and natural fibers – each of which lend varying properties to the concrete In addition the character of fiber-reinforced concrete Get price Get Price

4x4 Posts In Concrete Vs Saddles

Aug 16 2009I've learned to always use saddles in concrete to support my 4x4's for my fence posts golden rule never have wood in concrete To be honest my fences have always sucked never solid and straight enough Last night I watched Mike Holmes pound off 55 yards of fencing putting them in holes and filling with concrete Get price Get Price

Use of sea sand as fine aggregate in concrete making

In China where coastal areas are rich in sea sand and are already in wide use in local concrete construction The estuaries of the rivers which flow into the sea also have sand depositions that have to be dredged out of ports for keeping the area free for movement of the ships Get price Get Price

Sand Extraction 1 Introduction

Sand and gravel are used extensively in construction In the preparation of concrete for each tonne of cement the building industry needs about six to seven times more tonnes of sand and gravel (USGS 2013b) Thus the world's use of aggregates for concrete can be estimated at 25 9 billion to 29 6 billion tonnes a year for 2012 alone Get price Get Price

What type of concrete foundation do you pour for sand

What type of concrete foundation do you pour for sand? Ask Question Asked 4 years 9 You dig a hole until you hit something solid that's not sand and pour the concrete on that – iLikeDirt May 15 '15 at Compact sand (to say sand cannot be compacted is erroneous it just doesn't require much) can be a very stable base We have built Get price Get Price

Does anybody use sand as a base before they pour concrete

Does anybody use sand as a base before they pour concrete of a driveway? I was told by one of the contractor that I needed to put a layer of sand before I poured concrete for the driveway Another contractor told me that no sand is used because it is the cause for cracks as the concrete moves I Get price Get Price

Minimum Concrete Cover for Reinforcement

b) For a longitudinal reinforcing bar in a column concrete cover not less than 40 mm not less than the diameter of such bar should be provided In case of columns of minimum dimension of 20 cm or under whose reinforcing bars do no not exceed 12 mm concrete cover of 25 mm to be used for reinforcement Get price Get Price

A Guide to the Most Popular Patio Materials

For patio flooring flagstones need to be at least 1 1/2 inches thick and should be laid directly on soil or a bed or sand Thinner slabs can also be used but will need to be laid in concrete or wet mortar to prevent cracking Continue to 5 of 9 below 05 of 09 Pavers Get price Get Price

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