Adding dish soap to concrete is generally a bad idea for structural mixes as it creates weak, unstable air bubbles that drastically reduce strength and durability, leading to freeze-thaw damage. While it can act as a plasticizer (making it flow better) or be used in specialized, non-load-bearing projects like lightweight aircrete (foamed concrete) or to "kill" hot concrete in pumps, its use in regular mortar or concrete is risky due to unpredictable results and potential for large voids, making it inferior to proper air-entraining admixtures.
Dish soap often produces larger bubbles that collapse or coalesce over time, weakening the hardened concrete. That's a big risk for anything load-bearing or exposed to traffic.
Basic washing up liquid acts as a plasticiser, but reduces the final set strength of the mortar. Many washing up liquids also contain soluble salts, which cause temporary efflorescence and are hygroscopic.
Most bagged concrete comes in standard-sized bags. If I wanted to make it stronger, I'd take an old kitchen measuring cup and add 16 ounces of Portland cement and 8 ounces dry measure of hydrated lime to each bag of concrete.
Dawn dish soap. That's right, the same stuff that cleans your dishes breaks down oil molecules on concrete. Mix one quarter cup with a gallon of hot water, apply to the stain and let it sit for 15 minutes before power washing. The heat activates the soap's degreasing properties.
Concrete that is sealed is more resistant to stains, but harsh chemical cleaners will damage the sealant. Stick to cleaning only with dishwashing detergent. Stained concrete should be cleaned with a pH-neutral cleaner and water to help maintain the stain color.
This material is typically produced at a utility sluice pond site by dumping raw ash into the pond and allowing it to hydrate and harden into a working platform. Additional raw ash is placed on top of the platform in thin lifts, watered, compacted, and allowed to hydrate and harden.
A popular mix ratio for concrete is 1:2:3, which consists of 1 part cement, 2 parts sand, and 3 parts aggregates. The 1:2:3 mix ratio offers good strength and is easy to work with. This makes it ideal for common DIY jobs such as shed bases.
The 20/30/40 rule in concrete is a simple guideline for mix proportions, suggesting roughly 20% cementitious materials, 30% water + admixtures (for workability), and 40% aggregates (sand and gravel), providing a good balance for quality and economy. While often linked to a broader 10-20-30-40 rule (10% cement, 20% water/air, 30% sand, 40% gravel by volume), the 20/30/40 emphasizes the key component percentages for a practical mix, especially for achieving good strength and pumpability.
Moisture Matters: Curing keeps the concrete moist so this hydration process can continue. Without enough moisture, the crystals can't grow properly, and the concrete won't be as strong as it should be. Temperature Control: Curing also involves maintaining a moderate temperature.
Cement mixed with water can handle minor repairs, but only becomes strong, versatile concrete when combined with aggregates.
Washing-up liquid
Washing up liquid is commonly used as a plasticiser in cement mortar. However, it is thought to affect the long-term structural integrity of the mortar as it can add too much air, thereby creating bubbles.
Add warmer water. As one of the key ingredients in concrete, water is essential for the curing reaction to occur. The curing time can be hastened by using a slightly warmer water in the mixture as this will encourage the reaction to occur more quickly – do not, however, use blazing hot water as this could be damaging.
Hotsy's pressure-washing soaps are made with safety and biodegradability in mind. Almost every blend is safe for use on concrete.
The addition of sugar or Coca-Cola can slow down the hardening of the concrete and can increase the compressive strength up to a certain percentage. If add too much sugar or Coca-Cola, it will make the concrete brittle and unusable.
Vinegar is a natural, affordable option for cleaning rust, mold, and mildew off concrete, but it can damage sealed or decorative surfaces if not diluted or rinsed quickly.
DIY cleaners work well—use dish soap, vinegar, or hydrogen peroxide for stains. Follow a step-by-step process—clear debris, clean, scrub, rinse, and dry. Target stains effectively—baking soda for oil, vinegar for rust, and peroxide for mildew.
The "90-minute concrete rule" was a standard guideline (ASTM C94) requiring ready-mix concrete to be discharged from the truck within 90 minutes (1.5 hours) of mixing to ensure workability and quality, but this rule has been updated, allowing for custom time limits to be set by the purchaser and producer, acknowledging modern admixtures that extend working time, though the original principle of limiting time to maintain quality remains crucial.
In construction, a deadman is a relatively heavy weight, typically a mass concrete block used to provide support or resistance to a load. These blocks are usually embedded firmly in soil; however, some blocks may simply rest on the ground surface.
Water damage to concrete considerably impacts its strength. When excess water penetrates the concrete grains, it causes them to spread apart and crack, consequently creating more space between the grains.
Your existing old concrete should be fine to stain, so long as it is not contaminated with glue, paint, oil, grease, sealers, waxes, or anything else that would prevent the stain from soaking into the pores of the concrete.
Yes, you can.
But only when the old concrete is still in good shape. You'll often hear terms like “existing slab,” “new layer,” “overlay,” or “unbonded overlay.” All of these refer to pouring fresh concrete on top of an existing structure.
Mild Weather and Concrete Work
Most concrete experts agree that the milder weather associated with the spring and autumn months are the best time to pour concrete. It's the ideal time to commit to any concrete restoration projects. Temperature plays a large role in role in concrete's capacity to dry effectively.