Qivra: Slump Test Records

Qivra creates a clear, local measurement sheet for one fresh-concrete slump test.

Set the cone reference from the project procedure, keep the phone stationary, capture visible before and post-lift evidence, and confirm the landmarks that define the measurement. Qivra presents the result as a range with its main uncertainty source, or intentionally returns no number when the visible evidence is not defensible. Camera ranges are not yet checked against real site tests, so take a ruler reading too when the result matters.

When a camera setup is unsuitable, the complete physical-ruler fallback records the entered reading as an uncertainty range. Manual records remain visibly distinct from camera-derived records.

Each saved sheet includes the local batch alias and procedure-profile revision, the measurement method and bounded range or refusal reasons, evidence hashes and motion alignment details when available, an app-held event signature that helps detect later file changes, and local PDF, JSON, CSV, and .qivra exports. An offline .qivra verifier checks file structure, hashes, and signatures.

Qivra works without an account and has no network permission. Record payloads are encrypted with a key held by the device. Camera capture occurs only while the setup chamber is visible. You control export and local deletion.

Qivra is a documentation and measurement aid. It does not replace project specifications, licensed test standards, laboratory testing, site procedures, or qualified human judgment. It does not decide compliance, predict concrete strength, or authorize placement.