JHA / JSA / AHA builderHot Weather Concrete Acceptance and Evaporation Control JHA
A JHA breaks the work into steps, hazards and controls. Use this example to build a draft for your actual job and review it with your crew.
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Step 1 of 4 · Working draft
Your job
Tell Jenkins what you’re planning and where the work will happen. Use the actual job details.
Use the published example’s suggestions when they fit your task, or write your own steps. These are planned controls, not verified worksite conditions.
Describe an observable step, how someone could be harmed, and the control that acts on that hazard. Identify who checks it and what evidence is needed.
Walk through the plan with the people doing the work. Resolve missing controls and agree who checks them. Moving to the next step does not approve the work.
Confirm people, equipment and emergency arrangements
Record changes, checks, and open actions
Walk the work area, review with the crew, and resolve missing controls. Follow the required approval process. This tool does not judge completeness, verify signatures or authorize work.
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Your Hot Weather Concrete Acceptance and Evaporation Control JHA
Walk through the job in order. Use these possible hazards, planned controls and checks to start a conversation about your actual work.
011. Agree the environmental readiness and acceptance plan
Possible hazards: Uncoordinated deliveries or missing acceptance criteria can commit the crew to rapidly changing concrete conditions without adequate protection or placement capacity.
Planned controls: Placement lead reviews the forecast, current site exposure, mix requirements and delivery sequence with the supplier, testing personnel and finishing lead. Assign acceptance and escalation roles, agree the project’s environmental triggers and identify when work must be held. Confirm that the actual plan can be supported before calling loads.
Check before work: Lead verifies current criteria, assigned roles and supplier communication.
022. Make the protection resources ready
Possible hazards: Missing shade, wind protection, accessible water or protected work positions can leave plastic concrete and workers exposed when the delivery arrives.
Planned controls: Crew stages the selected windbreaks, shading, fogging or approved evaporation-control materials according to the actual method and site layout. Protect walking routes, electrical equipment and adjacent work from introduced moisture or obstructions. Lead separately confirms heat-plan resources, rest arrangements and emergency communication without treating concrete cooling as worker protection.
Check before work: Lead checks safe deployment of protection and worker heat resources.
033. Evaluate each delivery through the assigned acceptance route
Possible hazards: A hot or otherwise nonconforming load, unsafe sampling position or unauthorized addition can create exposure and conceal concrete that does not meet the project specification.
Planned controls: Assigned testing personnel obtain the required delivery information and perform the specified measurements from the planned safe position, coordinated with the truck operator. Record results and send questionable loads to the designated acceptance authority. Keep an unresolved delivery held; only authorized personnel may direct documented changes under the applicable mix and project requirements.
Check before work: Acceptance authority verifies required results before releasing the identified load.
044. Protect the early plastic surface
Possible hazards: Rapid surface moisture loss or misplaced spray can contribute to cracking, obscure footing or interfere with finishing and neighboring tasks.
Planned controls: Assigned crew applies the chosen early evaporation protection at the stage and locations established by the actual placement and finishing method. Maintain observation of the exposed surface and boundaries. Keep fogging or product application controlled; do not add water to the surface as an improvised finishing aid or assume an evaporation retarder substitutes for the specified final curing.
Check before work: Finishing lead verifies coverage, timing and safe access against the method.
055. Respond when conditions outpace the plan
Possible hazards: Increasing wind, changing delivery pace or heat symptoms can undermine a previously workable plan while production pressure discourages a pause.
Planned controls: Lead reassesses the agreed indicators and crew capacity as conditions change. Adjust only within the authorized method; hold new deliveries or pause affected work when protection or acceptance cannot be maintained. Use the employer’s heat-response arrangements for reported symptoms and obtain responsible technical direction for concrete outside the accepted plan.
Check before work: Lead records the changed condition, decision and resumption requirements.
066. Transfer protection and actual findings
Possible hazards: An undocumented handover can leave newly finished concrete unprotected or cause the next crew to mistake early evaporation controls for completed curing.
Planned controls: Record delivery dispositions, relevant environmental observations, protection actions and unresolved areas. Placement and finishing leads transfer responsibility for the next stage to the identified curing lead, with the actual specified method and start requirements. Restore routes safely and communicate any held loads, quality concerns or worker-heat actions that still affect the work.
Check before work: Receiving lead confirms each remaining protection action and open issue.
Example scope and starting conditions
A building concrete crew will coordinate hot-weather delivery acceptance and early surface evaporation protection for one outdoor slab placement. Assigned testing personnel use the actual specification; protection responsibility passes to separate finishing and curing leads. This operation does not teach a complete pour. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- The actual mix specification, delivery plan and acceptance authority are identified. Assigned personnel use the required temperature-testing and disposition method; no universal rejection temperature or unapproved mix additions are permitted.
- Temperature, humidity, wind and solar exposure inform the actual environmental plan. Worker heat precautions, delivery capacity, emergency communication and early protection resources are coordinated before dispatch.
- The link to hot-weather concrete work 238110-26 is partial: readiness, delivery acceptance and early evaporation control only. Full placement, powered or hand finishing, final curing, specialized cooling equipment and diagnosis or repair of hardened defects require separate analyses.
Know when to pause
- The actual acceptance criteria, assigned testing personnel or authorized disposition route are unavailable or inconsistent.
- Wind, exposure, delivery pace or surface behavior exceeds the plan’s available protection or placement capacity.
- Heat precautions, safe sampling access, emergency communication or protection resources are lost.
After a pause, correct the condition, reassess the work, and obtain required authorization before restarting.
Free example and template
No account required. The worked example contains planned controls. The blank template is for your own work; neither includes fabricated inspection results, signatures or approval.
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For managers
Does the team have what it needs to carry out the plan? Give the crew time, equipment and support, and make it clear who will resolve anything that is missing.
Manager checks and supporting resources
Confirm the people doing the work have the time, equipment, information and support to carry out the plan. Agree who checks the controls and who resolves open actions.
Questions to resolve before work
- Who applies the project’s concrete acceptance criteria, and how is a disputed delivery held and resolved?
- Which changing conditions trigger an adjustment or pause, and what early surface protection is actually available?
- Who maintains worker heat precautions and transfers surface-protection responsibility to the finishing and curing leads?
Training and qualifications to confirm
- Instruction on the actual temperature-testing and delivery-disposition procedure, including sampling responsibility, instrument readiness and limits on authorized mix adjustments.
- Task instruction on the chosen evaporation controls and heat plan, including recognizing loss of protection, maintaining safe access and reporting heat symptoms promptly.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
Can an accepted delivery be placed if the early protection plan is unavailable?
Acceptance of that load does not establish readiness of the work area. The placement lead must also confirm that exposure, crew capacity and required protection can be managed under the actual plan. Hold further commitment and obtain the appropriate decision if those conditions cannot be maintained; do not replace the missing method with uncontrolled surface water.
What must the crew record for actual use?
Record area, mix and specification revisions, acceptance roles, required delivery results and dispositions, relevant environmental observations, protection method and trigger decisions. Identify heat responsibilities, receiving finishing and curing leads, held loads and unresolved concerns; enter actual findings rather than copying favorable results.
Keep planning connected
Resources that support this JHA
Additional tools for task planning and safe work. Start with the free resources; explore paid options only when they meet an additional need.
Toolbox talks for the work
Prepare a practical crew discussion.
Heat: Conditions Change, Controls Change →Wet Concrete: Prevent Skin and Eye Contact →Pre-Job JHA/JSA: What Changed Today? →
Safety program resources
Review procedures, roles, and requirements.
Browse the existing catalog and confirm the scope and purchase availability of each program.
Browse safety programs →
Paid service · Availability
Task-specific training and qualifications
Explore applicable training and qualification needs.
Task-specific training services are not currently available to book here. Start with the free training-needs lookup; a toolbox talk or online course alone does not establish competence or employer authorization.
Review training needs · Free →People, equipment, emergency arrangements and open actions are recorded in the guided JHA’s Crew review step.
Open the crew review step →For safety professionals
How do we know the planning process and controls are working? Connect what the crew reports with field checks, risk decisions and the evidence behind your system.
Industry context, SIF, control verification and AHA review
Guidance and evidence
Review the method, risk decisions and evidence behind the plan. Use the actual jurisdiction, equipment instructions, employer process and project requirements.
Task-by-task control and verification rationale
1. Agree the environmental readiness and acceptance plan
Hazard: Uncoordinated deliveries or missing acceptance criteria can commit the crew to rapidly changing concrete conditions without adequate protection or placement capacity.
Control: Placement lead reviews the forecast, current site exposure, mix requirements and delivery sequence with the supplier, testing personnel and finishing lead. Assign acceptance and escalation roles, agree the project’s environmental triggers and identify when work must be held. Confirm that the actual plan can be supported before calling loads.
Verification: Lead verifies current criteria, assigned roles and supplier communication.
Why this belongs in the analysis: Predispatch agreement gives disputed deliveries an accountable decision path.
2. Make the protection resources ready
Hazard: Missing shade, wind protection, accessible water or protected work positions can leave plastic concrete and workers exposed when the delivery arrives.
Control: Crew stages the selected windbreaks, shading, fogging or approved evaporation-control materials according to the actual method and site layout. Protect walking routes, electrical equipment and adjacent work from introduced moisture or obstructions. Lead separately confirms heat-plan resources, rest arrangements and emergency communication without treating concrete cooling as worker protection.
Verification: Lead checks safe deployment of protection and worker heat resources.
Why this belongs in the analysis: Protection must be available and safe when exposure begins.
3. Evaluate each delivery through the assigned acceptance route
Hazard: A hot or otherwise nonconforming load, unsafe sampling position or unauthorized addition can create exposure and conceal concrete that does not meet the project specification.
Control: Assigned testing personnel obtain the required delivery information and perform the specified measurements from the planned safe position, coordinated with the truck operator. Record results and send questionable loads to the designated acceptance authority. Keep an unresolved delivery held; only authorized personnel may direct documented changes under the applicable mix and project requirements.
Verification: Acceptance authority verifies required results before releasing the identified load.
Why this belongs in the analysis: Actual specification evidence governs acceptance of each delivery.
4. Protect the early plastic surface
Hazard: Rapid surface moisture loss or misplaced spray can contribute to cracking, obscure footing or interfere with finishing and neighboring tasks.
Control: Assigned crew applies the chosen early evaporation protection at the stage and locations established by the actual placement and finishing method. Maintain observation of the exposed surface and boundaries. Keep fogging or product application controlled; do not add water to the surface as an improvised finishing aid or assume an evaporation retarder substitutes for the specified final curing.
Verification: Finishing lead verifies coverage, timing and safe access against the method.
Why this belongs in the analysis: Early evaporation control must remain compatible with later curing.
5. Respond when conditions outpace the plan
Hazard: Increasing wind, changing delivery pace or heat symptoms can undermine a previously workable plan while production pressure discourages a pause.
Control: Lead reassesses the agreed indicators and crew capacity as conditions change. Adjust only within the authorized method; hold new deliveries or pause affected work when protection or acceptance cannot be maintained. Use the employer’s heat-response arrangements for reported symptoms and obtain responsible technical direction for concrete outside the accepted plan.
Verification: Lead records the changed condition, decision and resumption requirements.
Why this belongs in the analysis: An early pause limits further commitment to unprotected work.
6. Transfer protection and actual findings
Hazard: An undocumented handover can leave newly finished concrete unprotected or cause the next crew to mistake early evaporation controls for completed curing.
Control: Record delivery dispositions, relevant environmental observations, protection actions and unresolved areas. Placement and finishing leads transfer responsibility for the next stage to the identified curing lead, with the actual specified method and start requirements. Restore routes safely and communicate any held loads, quality concerns or worker-heat actions that still affect the work.
Verification: Receiving lead confirms each remaining protection action and open issue.
Why this belongs in the analysis: Clear ownership prevents a protection gap between operations.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| It is summer; just add more water. | Testing personnel document the delivery results and the designated authority decides disposition or any permitted adjustment under the actual specification. |
| Spraying the surface means curing is done. | Finishing lead verifies the chosen early evaporation protection and hands over the separate final curing responsibility and requirements. |
Common questions
Can this example be used as a JSA?
Adapt the Task | Hazard | Control analysis to the employer’s JSA and actual work. Confirm assigned checks and record real findings before use.
What changes if the project requires an AHA?
Use the project’s governing AHA format, risk method and acceptance process. The published formwork AHA illustrates additional structure; this example supplies no AHA risk rating or acceptance.
Are these resources part of a paid course?
This walkthrough, browser draft builder and downloads are free public resources, separate from Academy course enrollment.
References and source note
- NRMCA CIP 12 Hot Weather Concreting
- OSHA Heat exposure planning resources
- OSHA 1926.701 General concrete construction requirements
Original instructional scenario with planned controls. Primary references support hazard planning. Use actual equipment and product instructions, project design and employer requirements to establish field criteria. This example supplies no inspection findings or work authorization. Use actual equipment instructions and site requirements alongside these references. Reference review: October 9, 2026.
Developed by Todd Jerome Jenkins, MS, CSP · Edition v1.0 · October 13, 2026
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