Cement Concrete Comp.
: Natural carbonation of concrete: data-driven analysis.
Month: January 2026
Why are air holes prone to occur on the surface of concrete during aluminum formwork construction
During the molding process of concrete, various factors such as materials, processes, and environmental conditions often lead to the formation of bubbles on the surface of the concrete.
A small amount of bubbles will not have a significant impact on components or buildings, but too many bubbles will bring a series of problems.
(When the air content of concrete increases by 1%, the compressive strength at 28 days decreases by 5%.
– Taken from Baidu Scholar).
The latest national standard for concrete! Strength reaches C200!
According to the clear provisions of the national standard “Ultra High Performance Concrete”, the mechanical performance classification criteria for Ultra High Performance Concrete (UHPC) are as follows: its compressive strength is divided into six grades, UC100 to UC200, based on its performance; Meanwhile, the tensile strength is divided into six grades, UT5 to UT13.
.
Why does concrete produce hard shell phenomenon
The phenomenon of hard shell in concrete is mainly due to the rapid evaporation of surface moisture, combined with the influence of admixture components and construction operations, resulting in surface hardening while the interior has not yet set.
I have sorted out the specific reasons and solutions for you:.
1 tip to teach you how to judge the state of concrete (must know)
The core technique for determining the state of concrete is to accurately identify whether the concrete meets the construction requirements (such as pumping, pouring, and vibration) through the detection and evaluation of “flowability cohesiveness water retention”.
The so-called “state” refers to workability (fluidity, cohesiveness, water retention), and the following core techniques are tested through practical experiments, judged by experience, and scientifically verified, suitable for trial and error .
.
.
The influence of silica fume application in concrete
Abstract: The performance of concrete is influenced by various factors, especially the addition of active silica fume, which can effectively improve its performance and extend its service life, thus improving the quality of engineering.
This article reviews the effects of silica fume and its mixed additives on the durability and mechanical properties of concrete, and looks forward to the research prospects of silica fume on improving concrete performance.
.
Why is ancient Roman concrete still durable after thousands of years?
Concrete was the cornerstone of the ancient Roman Empire.
It not only propelled the far-reaching architectural revolution in Rome, but was also used to construct numerous buildings, bridges, and aqueducts.
Many of these structures are still in use today, dating back over 2000 years.
Why was ancient Roman concrete so durable?.
Study on the influence of flocculant on the construction performance of concrete
Concrete is an artificial stone made by mixing cement, aggregates (such as sand, stone), water, and admixtures (such as fly ash, slag, etc.
) in a certain proportion.
Its main performance includes strength, durability, and construction performance.
The strength of concrete is a comprehensive reflection of indicators such as compressive strength, tensile strength, and flexural strength; Durability involves resistance to freeze-thaw, permeability, and chemical erosion, among others; The construction performance includes characteristics such as fluidity, drop retention, and setting time.
.
Study on the Effect of High Content Stone Powder Composite Substitution Method on Concrete Performance
At present, artificial sand has become the mainstream fine aggregate in concrete preparation.
Its use not only makes up for the shortage of river sand, but also prevents the environmental damage caused by river sand mining.
However, a large amount of stone powder is generated during the production process of artificial sand, accounting for about 4% of the total production of artificial sand.
If the stone powder is not effectively utilized, it will cause environmental pollution risks and resource waste, and floating in the air will also harm people’s health and life.
Therefore, the resource utilization of stone powder is urgent.
.
How to eliminate bubbles on the surface of concrete
(1) The quality of the raw materials used is poor, manifested as unreasonable aggregate grading, excessive coarse aggregate, insufficient fine aggregate, improper aggregate size, excessive content of needle shaped particles, and poor quality of air entraining agents.
.