Kiểm Soát Chất Lượng Đá, Cát Trước Khi Ra Công TrìnhQuality Control for Stone and Sand Before Delivery

Quality Control for Stone and Sand Before Delivery: What Investors Should Know

With construction materials, quality problems rarely surface at the moment of delivery — they tend to show up only after concrete has been poured or a base layer has been laid, when fixing the issue costs far more than catching it early. Below are the quality-control steps a serious stone and sand supplier should follow before material ever leaves the source, drawn from Phuc Hung’s hands-on experience supplying a range of large-scale projects.

Risks When Materials Aren’t Tightly Controlled From the Start

Sand containing silt or clay above the allowable limit will reduce concrete’s load-bearing strength even when the mix ratio is correct. Stone with high Los Angeles abrasion loss or an uneven particle gradation makes it difficult for a base layer to reach the required compaction density. More seriously, if material from multiple batches or sources gets mixed without proper control, quality can vary significantly between deliveries, creating difficulties during the acceptance of individual work items.

Inspection at the Quarry and Crushing Station Before Dispatch

Quality control needs to begin right at the source, before material is transported anywhere. Stone and sand samples should be taken periodically at the crushing station to check core parameters — fineness modulus and silt/clay content for sand; particle gradation and Los Angeles abrasion loss for stone and graded crushed stone — before each batch is released for dispatch.

A Test Result Certificate for Every Batch and Every Truckload

A serious quality-control process means keeping and providing a test result certificate for each batch of material dispatched, rather than presenting a single general certificate that covers an entire contract. This allows investors to verify the actual quality of each individual delivery — particularly important on large projects with continuous deliveries over an extended period.

Monitoring During Transport to Prevent Contamination

Material quality can still be affected during transport if it isn’t monitored — for instance, sand picking up soil or debris during loading, or stone from different batches getting mixed when loaded into the same truck bed. The transport process should ensure each shipment is checked before leaving the yard and remains unchanged until it reaches the job site.

Cross-Checking With the Project’s Testing Lab Upon Delivery

Even when material has already been checked at the source, a reliable supplier should still be willing to coordinate with the project’s accredited testing lab (LAS-XD) to cross-check results upon delivery, rather than treating the initial inspection certificate as the only and final check.

Quick Summary of the Quality Control Steps to Look For

Periodic sampling and inspection at the crushing station before dispatch.

A separate test result certificate for every batch and every truckload.

Monitoring during transport to prevent contamination or mixing between sources.

Willingness to coordinate with the project’s testing lab upon delivery.

A consistent quality-control process maintained throughout, not limited to a single checkpoint.

Having supplied materials to major projects such as the VinMetal Ha Tinh steel complex and the infrastructure within the Hanoi International Sports City, Phuc Hung maintains the process above from extraction through to delivery at the job site, aiming for consistent quality across every shipment an investor receives.

(This article shares general industry knowledge on quality control practices based on common practice; specific procedures and testing parameters may vary by material type and shipment.)